CN101831582B

CN101831582B - Low-cost heat resistance magnesium alloy containing rare earth and preparation method thereof

Info

Publication number: CN101831582B
Application number: CN2010101584524A
Authority: CN
Inventors: 张奎; 李兴刚; 焦红忠; 米绪军; 熊柏青; 孙银祥; 李永军; 李永华; 李明东
Original assignee: Beijing General Research Institute for Non Ferrous Metals
Current assignee: GRIMN Engineering Technology Research Institute Co Ltd
Priority date: 2007-07-05
Filing date: 2007-07-05
Publication date: 2012-09-19
Anticipated expiration: 2027-07-05
Also published as: CN101831582A

Abstract

The invention discloses a low-cost heat resistance magnesium alloy containing rare earth and a preparation method thereof. The low-cost heat resistance magnesium alloy containing the rare earth is formed by adding magnesium-rare earth intermediate alloy to the melted AZ91D, AM50B or AM60B and casting the materials. The weight percentage of the rare earth in the heat resistance magnesium alloy is 0.1 to 3.0 wt%; the rare earth is any one of La, Pr, Sm, Eu, Tb, Ho, Er, Tm, Dy, Gd, Ce, rich cerium mixed rare earth and rich neodymium mixed rare earth. The preparation method comprises the following steps of: casting 10 to 60 wt% of Mg-rare earth intermediate alloy ingot blank and extruding the blank into wire material or rod material; melting AZ91D, AM50B or AM60B magnesium alloy, cutting the wire material or rod material of the rare earth intermediate alloy into the sections, preheating and then adding the sections into the melted AZ91D, AM50B or AM60B and casting the melted liquid into the heat resistance magnesium alloy. The creep resistance of the magnesium alloy at the temperature of 120 DEG C to 200 DEG C is greatly improved. The invention can meet the application requirement of the magnesium alloy to the important elements such as the oil pan, the engine block, the automatic gearbox, the crankcase and the like.

Description

Low cost contains heat resistance magnesium alloy of rare earth and preparation method thereof

The application is that application number is: 200710118447.9, the applying date is the dividing an application of " low cost contains heat resistance magnesium alloy of rare earth and preparation method thereof " patented claim by name on July 5th, 2007.

Technical field

The present invention relates to a kind of low cost and contain heat resistance magnesium alloy of rare earth and preparation method thereof.

Background technology

Magnesiumalloy makes it have very significant advantage in many occasions owing to have less density (being a kind of of density minimum in the utility structure metal).Particularly at Aeronautics and Astronautics and automobile, motorcycle, at a high speed/have the alternate of being difficult to advantage aspect the vehicles lightweights such as light rail train.The density I of member to be saving the energy, also has the little advantage of inertia in the occasion of high-speed motion, and this startup and braking for the vehicles has remarkable effect.

Traditional magnesiumalloy such as AZ91D, AM50B, AM60B etc. have obtained to use widely, and wherein, the nominal composition of AZ91D is: Al-9, Zn-1, Mn-0.3; The nominal composition of AM50B is: Al-5, Mn-0.4; The nominal composition of AM60B is: Al-6, Mn-0.4.These magnesiumalloy still are several kinds of maximum magnesiumalloy of present application quantity.The outstanding feature of this type magnesiumalloy is to have excellent extrusion process performance, and this is the one of the main reasons that they obtain widespread use.But these alloys all have a shortcoming, are exactly low especially at the creep-resistant property of temperature more than 120 ℃.On the other hand; Existing creep resistance, heat resistance magnesium alloy; For example EQ21, QE22, WE43, WE54 etc. are silver-colored owing to containing a large amount of REEs, rare metal zirconium or precious metal in these alloys, in the EQ21 alloy; Contain rare earth 1.3～3.0 weight %, argentiferous 1.3～1.7 weight %, contain zirconium 0.4～1.0 weight %, the cost of this alloy is more than 4 times of AZ91D; In the WE43 alloy, contain rare earth 2.4～4.4 weight %, contain yttrium 3.7～4.3 weight %, contain zirconium 0.4～1.0 weight % for another example, the cost of this alloy is more than 2 times of AZ91D.Restricting the application of magnesiumalloy on vitals such as engine cylinder-body, automatic gear-box, crankcase, gear chamber cover, oil pan.

Summary of the invention

The purpose of this invention is to provide the heat resistance magnesium alloy that a kind of low cost contains rare earth; This heat resistance magnesium alloy cost has a small amount of increase, extrusion process performance to keep basically not reducing than AZ91D, AM50B, AM60B etc.; Creep-resistant property at 120 ℃～200 ℃ increases substantially, and can satisfy the application of this magnesiumalloy on vitals such as engine cylinder-body, automatic gear-box, crankcase, gear chamber cover, oil pan.

Another object of the present invention provides the preparation method that a kind of low cost contains the heat resistance magnesium alloy of rare earth.

A further object of the present invention provides a kind of Mg-rare earth intermediate alloy that low cost contains the heat resistance magnesium alloy of rare earth that is used to prepare.

For realizing above-mentioned purpose, the present invention takes following technical scheme:

A kind of low cost contains the heat resistance magnesium alloy of rare earth; This heat resistance magnesium alloy is in AZ91D, AM50B or AM60B liquation, to add the Mg-rare earth intermediate alloy; Form through die casting, wherein, the add-on of the rare earth of Mg-rare earth intermediate alloy is 0.10～3.0 weight % of AZ91D, AM50B or AM60B magnesiumalloy amount; Described rare earth is any one in La, Pr, Sm, Eu, Tb, Ho, Er, Tm, Dy, Gd, Ce, Y, cerium-rich mischmetal and the rich neodymium mixed rare-earth; Wherein, cerium-rich mischmetal be the content of Ce more than 40 weight %, all the other are other REEs; Other REE is other REEs such as La, Pr, Nd, Dy, Gd, and the quantity of other REE and content can be uncertain; The content that rich neodymium mixed rare-earth is Nd is more than 40 weight %, and all the other are other REEs, and other REE is other REEs such as La, Pr, Ce, Dy, Gd, and the quantity of other REE and content can be uncertain.Above-mentioned AZ91D nominal composition is: Al-9, Zn-1, Mn-0.3, AM50B nominal composition are: Al-5, Mn-0.4, AM60B nominal composition are: Al-6, Mn-0.4.

The low-cost method that contains the heat resistance magnesium alloy of rare earth of preparation, this method comprises following process:

The first step, founding Mg-(10～60) weight % rare earth intermediate alloy ingot blank;

Second goes on foot, and Mg-(10～60) weight % rare earth intermediate alloy ingot blank is squeezed into wire rod or the bar of Φ 2mm～Φ 60mm;

The 3rd step; With traditional AZ91D, AM50B or the fusing of AM60B magnesiumalloy; Add-on by the rare earth of Mg-rare earth intermediate alloy is 0.10～3.0 weight % of AZ91D, AM50B or AM60B magnesiumalloy amount, and the wire rod or the bar of Mg-(10～60) weight % rare earth intermediate alloy are cut into chunks, and again Mg-rare earth intermediate alloy section is preheating to 120～360 ℃; Add then in AZ91D, AM50B or the AM60B liquation, be cast into heat resistance magnesium alloy.

Low-cost heat-resisting magnesium alloy preparation method of the present invention is to be basic alloys with traditional magnesiumalloy such as AZ91D, AM50B, AM60B; Take when die casting is produced; In AZ91D or AM50B or AM60B liquation, add an amount of Mg-rare earth intermediate alloy, wherein the Mg-rare earth intermediate alloy is taked founding-pressing method preparation.

In the method for the low-cost heat resistance magnesium alloy that contains rare earth of preparation of the present invention, concrete steps are following:

The first step, founding Mg-(10～60) weight % rare earth intermediate alloy ingot blank, the ingot blank founding comprises the steps:

(1), with pure magnesium ingot and pure rare earth ingot or mishmetal ingot; Weight percent by the composition of Mg-10～60 weight % rare earth intermediate alloys is got the raw materials ready; Rare earth in the described pure rare earth ingot is any one among La, Pr, Sm, Eu, Tb, Ho, Er, Tm, Dy, Gd, Ce, the Y, and the mishmetal in the described mishmetal ingot is rich neodymium mixed rare-earth or cerium-rich mischmetal, wherein; Cerium-rich mischmetal be the content of Ce more than 40 weight %, all the other are other REEs; The content that rich neodymium mixed rare-earth is Nd is more than 40 weight %, and all the other are other REEs;

(2), preheating oven is warmed up to 160～660 ℃, and smelting furnace is warmed up to 500～800 ℃, and feeds shielding gas to smelting furnace;

(3), in preheating oven, pure magnesium ingot is preheating to 100～600 ℃, simultaneously pure rare earth ingot or mishmetal ingot are preheating to 100～500 ℃;

(4), in the smelting furnace of preheating, carry out the melting of pure magnesium ingot; The preheating pure magnesium ingot that at first will account for the fusing weight 1/2～1/20 of 1 smelting furnace adds in the smelting furnace; Make its fusing fully under the protection of shielding gas, then remaining preheating pure magnesium ingot is joined in the smelting furnace, after a collection of preheating pure magnesium ingot melts before treating in batches; Add the next batch preheated magnesium ingot again, every batch of add-on is submerged in the magnesium melt fully with pure magnesium ingot and is as the criterion; So repeat, reach preset value, after the fusing, the scum silica frost of molten surface is cleaned out fully, temperature is controlled at 680～860 ℃ until the pure magnesium ingot add-on;

(5), the pure rare earth ingot after the preheating or mishmetal ingot are submerged in the magnesium melt together with the charging basket that adds that holds them, adding charging basket is that soft steel or high chromium steel are processed, and is thick with a large amount of apertures on it, is convenient to the dissolving and the diffusion of rare earth;

(6), the magnesium melt temperature is controlled at 720～860 ℃, treat that rare earth dissolves fully after, 750～860 ℃ of insulations 10～60 minutes, rare earth is evenly distributed in the magnesium melt again;

(7), last; Mg-rare earth intermediate alloy liquation is poured in permanent mold casting mould or the sand mold casting mould of abundant preheating and is frozen into ingot blank; Perhaps Mg-rare earth intermediate alloy liquation is transported in the mold, carries out continuously or semicontinuous casting becomes ingot blank.

Second step was squeezed into wire rod or the bar of Φ 2mm～Φ 60mm with Mg-(10～60) weight % rare earth intermediate alloy ingot blank, and the extruding of wire rod or bar comprises the steps:

(1), master alloy wire rod or the diameter of bar of preparation as required, confirm the diameter of extruding with ingot blank.Definite principle of ingot blank diameter is to guarantee extrusion ratio greater than 10, and wherein, extrusion ratio is the cross-sectional area ÷ wire rod of ingot blank or the cross-sectional area of bar;

(2), adopt Vehicle Processing with ingot blank surface car light, ingot blank diameter and length are worked into extrusion machine internal diameter of the container and length are complementary simultaneously, normally blank diameter is than the little 3～8mm of internal diameter of the container, charge length is 1.5～3.0 times of blank diameter;

(3), adopt process furnace with blank heating to 360 ℃～550 ℃, be incubated 6～36 hours;

(4), the container temperature is 320 ℃～490 ℃, the extrusion stem rate of advance is 0.5mm～10mm/ second.

In the 3rd step, the preparation with low-cost heat-resisting magnesium alloy AZ91D+ (0.10～3.0) weight % rare earth, AM50B+ (0.10～3.0) weight % rare earth, AM60B+ (0.10～3.0) weight % rare earth is produced in die casting, comprises the steps:

(1), employing and the supporting magnesium alloy melting furnace of pressure die-casting machine, with traditional AZ91D, AM50B, the fusing of AM60B magnesiumalloy;

(2), according to the requirement of diecast parts to the magnesiumalloy resistance toheat, the rare earth alloy element and the content of rare earth that confirm to need add; And according to the rare earth content that will add, select the content of Mg-rare earth intermediate alloy middle-weight rare earths and the diameter of master alloy wire rod or bar for use;

(3), magnesium alloy parts die casting is produced the AZ91D, AM50B, the AM60B magnesiumalloy remelting ingot casting weight specification that adopt and is mainly contained 5kg, 7.5kg, 10kg, 12kg; According to rare earth content, the content of Mg-rare earth intermediate alloy middle-weight rare earths and the diameter of master alloy wire rod or bar that remelting ingot casting weight specification, low-cost heat-resisting magnesium alloy needs add, master alloy wire rod or rod length fixing are cut into chunks;

(4), the Mg-rare earth intermediate alloy section with scale is preheating to 120～360 ℃; In the press casting procedure; 1 AZ91D of every adding, AM50B or AM60B magnesiumalloy remelting ingot casting; Add 1 section Mg-rare earth intermediate alloy section simultaneously, wherein, the content of the rare earth in every section master alloy wire rod or the bar is the weight of the adding of every block of rare earth in the remelting ingot casting.

A kind ofly be used to prepare the employed Mg-rare earth intermediate alloy of heat resistance magnesium alloy of the present invention, the content of the rare earth in this Mg-rare earth intermediate alloy is 10～60 weight %, and surplus is Mg.

Described Mg-rare earth intermediate alloy is wire rod or the bar of Φ 2mm～Φ 60mm.

Advantage of the present invention is: adopt the heat resistance magnesium alloy of the inventive method preparation, its cost has only a small amount of increase than AZ91D, AM50B, AM60B etc., approximately increases by 3%～20%; The extrusion process performance is basic suitable with former magnesiumalloy, satisfies the extrusion process requirement; Creep-resistant property at 150 ℃～175 ℃ increases substantially; Such as for AZ91D+0.6 weight % rare earth alloy; Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain; 12～17MPa by AZ91D brings up to 35～50MPa, can satisfy this application of magnesiumalloy on vitals such as gear chamber cover, oil pan.

Creep resistance of the present invention, heat resistance magnesium alloy are following with existing creep resistance, heat resistance magnesium alloy on the cost of manufacture: in existing creep resistance, heat-stable EQ21 magnesiumalloy; It contains rare earth 1.3～3.0 weight %, argentiferous 1.3～1.7 weight %, contains zirconium 0.4～1.0 weight %, and the cost of this alloy is more than 4 times of AZ91D; In existing creep resistance, heat-stable WE43 magnesiumalloy, it contains rare earth 2.4～4.4 weight %, contains yttrium 3.7～4.3 weight %, contains zirconium 0.4～1.0 weight %, and the cost of this alloy is more than 2 times of AZ91D.And creep resistance of the present invention, heat resistance magnesium alloy approximately are 1.03～1.20 times of AZ91D, AM50B, AM60B, therefore, creep resistance of the present invention, heat resistance magnesium alloy and existing creep resistance, heat resistance magnesium alloy ratio, its cost is quite low.

Embodiment

In following embodiment, " % " in described AZ91D, AM50B or AM60B+0.10～3.0% magnesium-rare earth is " weight % "; And expression is with respect to AZ91D, AM50B or AM60B; Add 0.10～3.0 weight % rare earth, the magnesiumalloy of processing, as; AZ91D+0.1% cerium-rich mischmetal magnesiumalloy is with respect to AZ91D, adds the magnesiumalloy that the cerium-rich mischmetal of 0.1 weight % is processed." % " of Mg-10～60% rare earth intermediate alloy is " weight % ", as: Mg-10% cerium-rich mischmetal master alloy, the content of representing the cerium-rich mischmetal in this master alloy are 10 weight %, and surplus is Mg.

Embodiment 1-embodiment 5 produces the low-cost embodiment that contains the heat resistance magnesium alloy of cerium-rich mischmetal about die casting.

Embodiment 1: die casting is produced with AZ91D+0.1% cerium-rich mischmetal magnesium alloy smelting method

1, founding Mg-10% cerium-rich mischmetal master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-10% cerium-rich mischmetal master alloy of the present invention;

(2), preheating oven is warmed up to 360～460 ℃, and smelting furnace is warmed up to 500～600 ℃, and feeds shielding gas to smelting furnace;

(3), in preheating oven, pure magnesium ingot is preheating to 360～460 ℃, simultaneously pure cerium-rich mischmetal ingot is preheating to 360～460C;

(4), in the smelting furnace of preheating, carry out the melting of pure magnesium ingot; The preheating pure magnesium ingot that at first will account for the fusing weight 1/2～1/20 of 1 smelting furnace adds in the smelting furnace; Make its fusing fully under the protection of shielding gas, then remaining preheating pure magnesium ingot is joined in the smelting furnace, after a collection of preheating pure magnesium ingot melts before treating in batches; Add the next batch preheated magnesium ingot again, every batch of add-on is submerged in the magnesium melt fully with pure magnesium ingot and is as the criterion; So repeat, reach preset value, after the fusing, the scum silica frost of molten surface is cleaned out fully, temperature is controlled at 760～830 ℃ until the pure magnesium ingot add-on;

(5), the pure cerium-rich mischmetal ingot after the preheating is submerged in the magnesium melt together with the charging basket that adds that holds them, adding charging basket is that soft steel or high chromium steel are processed, and is thick with a large amount of apertures on it, is convenient to the dissolving and the diffusion of cerium-rich mischmetal;

(6), the magnesium melt temperature is controlled at 720～860 ℃, treat that cerium-rich mischmetal dissolves fully after, 750～860 ℃ of insulations 10～60 minutes, the alloying element cerium-rich mischmetal is evenly distributed in the magnesium melt again;

(7), last, Mg-cerium-rich mischmetal master alloy liquation is poured in the permanent mold casting mould of abundant preheating and is frozen into the ingot blank that diameter is Φ 95mm.

2, Mg-10% cerium-rich mischmetal master alloy ingot blank is squeezed into the bar of Φ 16mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 6300kN, the container diameter is 96mm;

(2), adopt band saw to become 250mm long the sawing of ingot blank scale, adopt lathe that the ingot blank diameter is processed into Φ 93mm;

(3), adopt process furnace with blank heating to 530 ± 5 ℃, be incubated 24 hours;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 2mm～3mm/ second, Mg-10% cerium-rich mischmetal master alloy ingot blank is squeezed into the bar of Φ 16mm;

(5), with shearing machine above-mentioned master alloy rod length fixing is cut into the master alloy section of 180 ± 2mm length, about 74 grammes per square metres.

3, die casting is produced with AZ91D+0.1% cerium-rich mischmetal magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 150 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AZ91D+0.1% cerium-rich mischmetal magnesiumalloy liquation, can carry out die casting production;

(2), along with the carrying out that die casting is produced, need constantly to replenish AZ91D and the master alloy section after 120～360 ℃ of preheatings, the AZ91D remelting ingot casting of 1 7.5kg specification of every adding just adds 1 master alloy section simultaneously, so repeatedly, produces until die casting and to finish.

This AZ91D+0.1% cerium-rich mischmetal magnesiumalloy cost is than the about increase by 3% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 120 ℃, 100 hours, producing 0.1% creep strain, 14～17MPa by AZ91D brings up to 27～32MPa, can satisfy the application of this magnesiumalloy on the small displacement engine oil pan below 1.0 liters.

Embodiment 2: die casting is produced with AZ91D+3.0% cerium-rich mischmetal magnesium alloy smelting method

1, founding Mg-50% cerium-rich mischmetal master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-50% cerium-rich mischmetal master alloy of the present invention;

(3), in preheating oven, pure magnesium ingot is preheating to 360～460 ℃, simultaneously pure cerium-rich mischmetal ingot is preheating to 360～460 ℃;

(7), last, Mg-cerium-rich mischmetal master alloy liquation is transported in the mold, carry out continuously or semicontinuous casting to become diameter be the ingot blank of Φ 300mm.

2, Mg-50% cerium-rich mischmetal master alloy ingot blank is squeezed into the bar of Φ 60mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 30000kN, the container diameter is 300mm;

(2), adopt band saw to become 700mm long the sawing of ingot blank scale, adopt lathe that the ingot blank diameter is processed into Φ 293mm;

(3), adopt process furnace with blank heating to 530 ± 5 ℃, be incubated 36 hours;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 8mm～10mm/ second, Mg-50% cerium-rich mischmetal master alloy ingot blank is squeezed into the bar of Φ 60mm;

(5), with shearing machine above-mentioned master alloy rod length fixing is cut into the master alloy section of 127 ± 2mm length, about 1.4 kilogram weights.

3, die casting is produced with AZ91D+3.0% cerium-rich mischmetal magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 10 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AZ91D+3.0% cerium-rich mischmetal magnesiumalloy liquation, can carry out die casting production;

(2), the carrying out that produces along with die casting; Need constantly to replenish AZ91D and the master alloy section after 120～360 ℃ of preheatings, the AZ91D remelting ingot casting of 2 12kg specifications of every adding just adds 1 above-mentioned master alloy section simultaneously; So repeatedly, produce end until die casting.

This AZ91D+3.0% cerium-rich mischmetal magnesiumalloy cost is than the about increase by 15% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 200 ℃, 100 hours, producing 0.1% creep strain, 5～7MPa by AZ91D brings up to 25～30MPa, can satisfy the application of this magnesiumalloy at 1.0～1.6 liter capacity engine cylinder-bodies.

Embodiment 3: die casting is produced with AZ91D+1.0% cerium-rich mischmetal magnesium alloy smelting method

1, founding Mg-30% cerium-rich mischmetal master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-30% cerium-rich mischmetal master alloy of the present invention;

(7), last, Mg-cerium-rich mischmetal master alloy liquation is poured in the permanent mold casting mould of abundant preheating and is frozen into the ingot blank that diameter is Φ 200mm.

2, Mg 30% cerium-rich mischmetal master alloy ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

(2), adopt band saw to become 500mm long the sawing of ingot blank scale, adopt lathe that the ingot blank diameter is processed into Φ 193mm;

(3), adopt process furnace with blank heating to 530 ± 5 ℃, be incubated 32 hours;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 7mm～9mm/ second, Mg-50% cerium-rich mischmetal master alloy ingot blank is squeezed into the bar of Φ 40mm;

(5), with shearing machine above-mentioned master alloy rod length fixing is cut into the master alloy section of 106 ± 2mm length, about 0.4 kilogram weight.

3, die casting is produced with AZ91D+1.0% cerium-rich mischmetal magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AZ91D+1.0% cerium-rich mischmetal magnesiumalloy liquation, can carry out die casting production;

(2), the carrying out that produces along with die casting; Need constantly to replenish AZ91D and the master alloy section after 120～360 ℃ of preheatings, the AZ91D remelting ingot casting of 1 12kg specification of every adding just adds 1 above-mentioned master alloy section simultaneously; So repeatedly, produce end until die casting.

This AZ91D+1.0% cerium-rich mischmetal magnesiumalloy cost is than the about increase by 8% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain, 9～11MPa by AZ91D brings up to 32～35MPa, can satisfy the application of this magnesiumalloy in the car automatic gear-box.

Embodiment 4: die casting is produced with AM60B+2.0% cerium-rich mischmetal magnesium alloy smelting method

2, Mg-50% cerium-rich mischmetal master alloy ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

(3), adopt process furnace with blank heating to 380 ± 5 ℃, be incubated 32 hours;

(5), with shearing machine above-mentioned master alloy rod length fixing is cut into the master alloy section of 166 ± 2mm length, about 0.48 kilogram weight.

3, die casting is produced with AM60B+2.0% cerium-rich mischmetal magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AM60B magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AM60B+2.0% cerium-rich mischmetal magnesiumalloy liquation, can carry out die casting production;

(2), the carrying out that produces along with die casting; Need constantly to replenish AM60B and the master alloy section after 120～360 ℃ of preheatings, the AM60B remelting ingot casting of 1 12kg specification of every adding just adds 1 above-mentioned master alloy section simultaneously; So repeatedly, produce end until die casting.

This AM60B+2.0% cerium-rich mischmetal magnesiumalloy cost is than the about increase by 11% of AM60B, and the extrusion process performance is basic suitable with AM60B, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain, 7～9MPa by AM60B brings up to 32～35MPa, can satisfy the application of this magnesiumalloy at motorcycle crankcase.

Embodiment 5: die casting is produced with AM50B+2.0% cerium-rich mischmetal magnesium alloy smelting method

1, founding Mg-60% cerium-rich mischmetal master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-60% cerium-rich mischmetal master alloy of the present invention;

(4), in the smelting furnace of preheating, carry out the melting of pure magnesium ingot; The preheating pure magnesium ingot that at first will account for the fusing weight 1/2～1/20 of 1 smelting furnace adds in the smelting furnace; Make its fusing fully under the protection of shielding gas, then remaining preheating pure magnesium ingot is joined in the smelting furnace, after a collection of preheating pure magnesium ingot melts before treating in batches; Add the next batch preheated magnesium ingot again, every batch of add-on is submerged in the magnesium melt fully with pure magnesium ingot and is as the criterion; So repeat, reach preset value, after the fusing, the scum silica frost of molten surface is cleaned out fully, temperature is controlled at 780～850 ℃ until the pure magnesium ingot add-on;

2, Mg-60% cerium-rich mischmetal master alloy ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 7mm～9mm/ second, Mg-60% cerium-rich mischmetal master alloy ingot blank is squeezed into the bar of Φ 40mm;

(5), with shearing machine above-mentioned master alloy rod length fixing is cut into the master alloy section of 138 ± 2mm length, about 0.40 kilogram weight.

3, die casting is produced with AM50B+2.0% cerium-rich mischmetal magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AM60B magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AM50B+2.0% cerium-rich mischmetal magnesiumalloy liquation, can carry out die casting production;

(2), the carrying out that produces along with die casting; Need constantly to replenish AM50B and the master alloy section after 120～360 ℃ of preheatings, the AM50B remelting ingot casting of 1 12kg specification of every adding just adds 1 above-mentioned master alloy section simultaneously; So repeatedly, produce end until die casting.

This AM50B+2.0% cerium-rich mischmetal magnesiumalloy cost is than the about increase by 11% of AM50B, and the extrusion process performance is basic suitable with AM50B, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain, 6.5～8.5MPa by AM50B brings up to 31～34MPa, can satisfy the application of this magnesiumalloy at less discharge capacity motorcycle crankcase.

Embodiment 6-embodiment 10 produces the low-cost embodiment that contains the heat resistance magnesium alloy of Y about die casting.

Embodiment 6: die casting is produced and is used the AZ91D+0.1%Y magnesium alloy smelting method

1, founding Mg-10%Y master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-10%Y master alloy of the present invention;

(5), the pure Y ingot after the preheating is submerged in the magnesium melt together with the charging basket that adds that holds them, adding charging basket is that soft steel or high chromium steel are processed, and is thick with a large amount of apertures on it, is convenient to dissolving and the diffusion of Y;

(6), the magnesium melt temperature is controlled at 720～860 ℃, treat that Y dissolves fully after, 750～860 ℃ of insulations 10～60 minutes, alloying element Y is evenly distributed in the magnesium melt again;

(7), last, Mg-Y master alloy liquation is poured in the permanent mold casting mould of abundant preheating and is frozen into the ingot blank that diameter is Φ 95mm.

2, Mg-10%Y master alloy ingot blank is squeezed into the bar of Φ 16mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 6300kN, the container diameter is 96mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 2mm～3mm/ second, Mg-10%Y master alloy ingot blank is squeezed into the bar of Φ 16mm;

3, die casting is produced and is used the AZ91D+0.1%Y magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 150 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AZ91D+0.1%Y magnesiumalloy liquation, can carry out die casting production;

This AZ91D+0.1%Y magnesiumalloy cost is than the about increase by 5% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 120 ℃, 100 hours, producing 0.1% creep strain, 14～17MPa by AZ91D brings up to 28～33MPa, can satisfy the application of this magnesiumalloy on the small displacement engine oil pan below 1.3 liters.

Embodiment 7: die casting is produced and is used the AZ91D+3.0%Y magnesium alloy smelting method

1, founding Mg-50%Y master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-50%Y master alloy of the present invention;

(7), last, Mg-Y master alloy liquation is transported in the mold, carry out continuously or semicontinuous casting to become diameter be the ingot blank of Φ 300mm.

2, Mg-50%Y master alloy ingot blank is squeezed into the bar of Φ 60mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 30000kN, the container diameter is 300mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 8mm～10mm/ second, Mg-50%Y master alloy ingot blank is squeezed into the bar of Φ 60mm;

3, die casting is produced and is used the AZ91D+3.0%Y magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 10 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AZ91D+3.0%Y magnesiumalloy liquation, can carry out die casting production;

This AZ91D+3.0%Y magnesiumalloy cost is than the about increase by 20% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 200 ℃, 100 hours, producing 0.1% creep strain, 5～7MPa by AZ91D brings up to 27～31MPa, can satisfy the application of this magnesiumalloy at 1.6～2.0 liter capacity engine cylinder-bodies.

Embodiment 8: die casting is produced and is used the AZ91D+1.0%Y magnesium alloy smelting method

1, founding Mg-30%Y master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-30%Y master alloy of the present invention;

(7), last, Mg-Y master alloy liquation is poured in the permanent mold casting mould of abundant preheating and is frozen into the ingot blank that diameter is Φ 200mm.

2, Mg-30%Y master alloy ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 7mm～9mm/ second, Mg-50%Y master alloy ingot blank is squeezed into the bar of Φ 40mm;

3, die casting is produced and is used the AZ91D+1.0%Y magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AZ91D+1.0%Y magnesiumalloy liquation, can carry out die casting production;

This AZ91D+1.0%Y magnesiumalloy cost is than the about increase by 10% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain, 9～11MPa by AZ91D brings up to 30～35MPa, can satisfy the application of this magnesiumalloy in the car automatic gear-box.

Embodiment 9: die casting is produced and is used the AM60B+2.0%Y magnesium alloy smelting method

2, Mg-50%Y master alloy ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

3, die casting is produced and is used the AM60B+2.0%Y magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AM60B magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AM60B+2.0%Y magnesiumalloy liquation, can carry out die casting production;

This AM60B+2.0%Y magnesiumalloy cost is than the about increase by 15% of AM60B, and the extrusion process performance is basic suitable with AM60B, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain, 7～9MPa by AM60B brings up to 33～35MPa, can satisfy the application of this magnesiumalloy at motorcycle crankcase.

Embodiment 10: die casting is produced and is used the AM50B+2.0%Y magnesium alloy smelting method

1, founding Mg-60%Y master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-60%Y master alloy of the present invention;

(3), in preheating oven, pure magnesium ingot is preheating to 360～460 ℃, simultaneously pure Y ingot is preheating to 360～460 ℃;

2, Mg-60%Y master alloy ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 7mm～9mm/ second, Mg-60%Y master alloy ingot blank is squeezed into the bar of Φ 40mm;

3, die casting is produced and is used the AM50B+2.0%Y magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AM50B magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AM50B+2.0%Y magnesiumalloy liquation, can carry out die casting production;

This AM50B+2.0%Y magnesiumalloy cost is than the about increase by 15% of AM50B, and the extrusion process performance is basic suitable with AM50B, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain, 6.5～8.5MPa by AM50B brings up to 32～35MPa, can satisfy the application of this magnesiumalloy at less discharge capacity motorcycle crankcase.

Embodiment 11-embodiment 15 produces the low-cost embodiment that contains the heat resistance magnesium alloy of Dy about die casting.

Embodiment 11: die casting is produced and is used the AZ91D+0.1%Dy magnesium alloy smelting method

1, founding Mg-10%Dy master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-10%Dy master alloy of the present invention;

(3), in preheating oven, pure magnesium ingot is preheating to 360～460 ℃, simultaneously pure Dy ingot is preheating to 360～460 ℃;

(5), the pure Dy ingot after the preheating is submerged in the magnesium melt together with the charging basket that adds that holds them, adding charging basket is that soft steel or high chromium steel are processed, and is thick with a large amount of apertures on it, is convenient to dissolving and the diffusion of Dy;

(6), the magnesium melt temperature is controlled at 720～860 ℃, treat that Dy dissolves fully after, 750～860 ℃ of insulations 10～60 minutes, alloying element Dy is evenly distributed in the magnesium melt again;

(7), last, Mg-Dy master alloy liquation is poured in the permanent mold casting mould of abundant preheating and is frozen into the ingot blank that diameter is Φ 95mm.

2, Mg-10%Dy master alloy ingot blank is squeezed into the bar of Φ 16mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 6300kN, the container diameter is 96mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 2mm～3mm/ second, Mg-10%Dy master alloy ingot blank is squeezed into the bar of Φ 16mm;

3, die casting is produced and is used the AZ91D+0.1%Dy magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 150 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AZ91D+0.1%Dy magnesiumalloy liquation, can carry out die casting production;

This AZ91D+0.1%Dy magnesiumalloy cost is than the about increase by 5% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 120 ℃, 100 hours, producing 0.1% creep strain, 14～17MPa by AZ91D brings up to 28～33MPa, can satisfy the application of this magnesiumalloy on the small displacement engine oil pan below 1.3 liters.

Embodiment 12: die casting is produced and is used the AZ91D+3.0%Dy magnesium alloy smelting method

1, founding Mg-50%Dy master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-50%Dy master alloy of the present invention;

(7), last, Mg-Dy master alloy liquation is transported in the mold, carry out continuously or semicontinuous casting to become diameter be the ingot blank of Φ 300mm.

2, Mg-50%Dy master alloy ingot blank is squeezed into the bar of Φ 60mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 30000kN, the container diameter is 300mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 8mm～10mm/ second, Mg-50%Dy master alloy ingot blank is squeezed into the bar of Φ 60mm;

3, die casting is produced and is used the AZ91D+3.0%Dy magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 10 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AZ91D+3.0%Dy magnesiumalloy liquation, can carry out die casting production;

This AZ91D+3.0%Dy magnesiumalloy cost is than the about increase by 20% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 200 ℃, 100 hours, producing 0.1% creep strain, 5～7MPa by AZ91D brings up to 27～31MPa, can satisfy the application of this magnesiumalloy at 1.6～2.0 liter capacity engine cylinder-bodies.

Embodiment 13: die casting is produced and is used the AZ91D+1.0%Dy magnesium alloy smelting method

1, founding Mg-30%Dy master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-30%Dy master alloy of the present invention;

(7), last, Mg-Dy master alloy liquation is poured in the permanent mold casting mould of abundant preheating and is frozen into the ingot blank that diameter is Φ 200mm.

2, Mg-30%Dy master alloy ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 7mm～9mm/ second, Mg-50%Dy master alloy ingot blank is squeezed into the bar of Φ 40mm;

3, die casting is produced and is used the AZ91D+1.0%Dy magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AZ91D+1.0%Dy magnesiumalloy liquation, can carry out die casting production;

This AZ91D+1.0%Dy magnesiumalloy cost is than the about increase by 10% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain, 9～11MPa by AZ91D brings up to 33～36MPa, can satisfy the application of this magnesiumalloy in the car automatic gear-box.

Embodiment 14: die casting is produced and is used the AM60B+2.0%Dy magnesium alloy smelting method

2, Mg-50%Dy master alloy ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

3, die casting is produced and is used the AM60B+2.0%Dy magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AM60B magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AM60B+2.0%Dy magnesiumalloy liquation, can carry out die casting production;

This AM60B+2.0%Dy magnesiumalloy cost is than the about increase by 15% of AM60B, and the extrusion process performance is basic suitable with AM60B, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain, 7～9MPa by AM60B brings up to 33～35MPa, can satisfy the application of this magnesiumalloy at motorcycle crankcase.

Embodiment 15: die casting is produced and is used the AM50B+2.0%Dy magnesium alloy smelting method

1, founding Mg-60%Dy master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-60%Dy master alloy of the present invention;

2, Mg-60%Dy master alloy ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 7mm～9mm/ second, Mg-60%Dy master alloy ingot blank is squeezed into the bar of Φ 40mm;

3, die casting is produced and is used the AM50B+2.0%Dy magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AM50B magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AM50B+2.0%Dy magnesiumalloy liquation, can carry out die casting production;

This AM50B+2.0%Dy magnesiumalloy cost is than the about increase by 15% of AM50B, and the extrusion process performance is basic suitable with AM50B, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain, 6.5～8.5MPa by AM50B brings up to 32～35MPa, can satisfy the application of this magnesiumalloy at less discharge capacity motorcycle crankcase.

Embodiment 16-embodiment 20 produces the low-cost embodiment that contains the heat resistance magnesium alloy of Gd about die casting.

Embodiment 16: die casting is produced and is used the AZ91D+0.1%Gd magnesium alloy smelting method

1, founding Mg-10%Gd master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-10%Gd master alloy of the present invention;

(3), in preheating oven, pure magnesium ingot is preheating to 360～460 ℃, simultaneously pure Gd ingot is preheating to 360～460 ℃;

(5), the pure Gd ingot after the preheating is submerged in the magnesium melt together with the charging basket that adds that holds them, adding charging basket is that soft steel or high chromium steel are processed, and is thick with a large amount of apertures on it, is convenient to dissolving and the diffusion of Gd;

(6), the magnesium melt temperature is controlled at 720～860 ℃, treat that Gd dissolves fully after, 750～860 ℃ of insulations 10～60 minutes, alloying element Gd is evenly distributed in the magnesium melt again;

(7), last, Mg-Gd master alloy liquation is poured in the permanent mold casting mould of abundant preheating and is frozen into the ingot blank that diameter is Φ 95mm.

2, Mg-10%Gd master alloy ingot blank is squeezed into the bar of Φ 16mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 6300kN, the container diameter is 96mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 2mm～3mm/ second, Mg-10%Gd master alloy ingot blank is squeezed into the bar of Φ 16mm;

3, die casting is produced and is used the AZ91D+0.1%Gd magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 150 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AZ91D+0.1%Gd magnesiumalloy liquation, can carry out die casting production;

This AZ91D+0.1%Gd magnesiumalloy cost is than the about increase by 5% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 120 ℃, 100 hours, producing 0.1% creep strain, 14～17MPa by AZ91D brings up to 28～33MPa, can satisfy the application of this magnesiumalloy on the small displacement engine oil pan below 1.3 liters.

Embodiment 17: die casting is produced and is used the AZ91D+3.0%Gd magnesium alloy smelting method

1, founding Mg-50%Gd master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-50%Gd master alloy of the present invention;

(7), last, Mg-Gd master alloy liquation is transported in the mold, carry out continuously or semicontinuous casting to become diameter be the ingot blank of Φ 300mm.

2, Mg-50%Gd master alloy ingot blank is squeezed into the bar of Φ 60mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 30000kN, the container diameter is 300mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 8mm～10mm/ second, Mg-50%Gd master alloy ingot blank is squeezed into the bar of Φ 60mm;

3, die casting is produced and is used the AZ91D+3.0%Gd magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 10 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AZ91D+3.0%Gd magnesiumalloy liquation, can carry out die casting production;

This AZ91D+3.0%Gd magnesiumalloy cost is than the about increase by 20% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 200 ℃, 100 hours, producing 0.1% creep strain, 5～7MPa by AZ91D brings up to 27～31MPa, can satisfy the application of this magnesiumalloy at 1.6～2.0 liter capacity engine cylinder-bodies.

Embodiment 18: die casting is produced and is used the AZ91D+1.0%Gd magnesium alloy smelting method

1, founding Mg-30%Gd master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-30%Gd master alloy of the present invention;

(7), last, Mg-Gd master alloy liquation is poured in the permanent mold casting mould of abundant preheating and is frozen into the ingot blank that diameter is Φ 200mm.

2, Mg-30%Gd master alloy ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 7mm～9mm/ second, Mg-50%Gd master alloy ingot blank is squeezed into the bar of Φ 40mm;

3, die casting is produced and is used the AZ91D+1.0%Gd magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AZ91D+1.0%Gd magnesiumalloy liquation, can carry out die casting production;

This AZ91D+1.0%Gd magnesiumalloy cost is than the about increase by 10% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain, 9～11MPa by AZ91D brings up to 33～36MPa, can satisfy the application of this magnesiumalloy in the car automatic gear-box.

Embodiment 19: die casting is produced and is used the AM60B+2.0%Gd magnesium alloy smelting method

2, Mg-50%Gd master alloy ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

3, die casting is produced and is used the AM60B+2.0%Gd magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AM60B magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AM60B+2.0%Gd magnesiumalloy liquation, can carry out die casting production;

This AM60B+2.0%Gd magnesiumalloy cost is than the about increase by 15% of AM60B, and the extrusion process performance is basic suitable with AM60B, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain, 7～9MPa by AM60B brings up to 33～35MPa, can satisfy the application of this magnesiumalloy at motorcycle crankcase.

Embodiment 20: die casting is produced and is used the AM50B+2.0%Gd magnesium alloy smelting method

1, founding Mg-60%Gd master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-60%Gd master alloy of the present invention;

2, Mg-60%Gd master alloy ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 7mm～9mm/ second, Mg-60%Gd master alloy ingot blank is squeezed into the bar of Φ 40mm;

3, die casting is produced and is used the AM50B+2.0%Gd magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AM60B magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AM50B+2.0%Gd magnesiumalloy liquation, can carry out die casting production;

This AM50B+2.0%Gd magnesiumalloy cost is than the about increase by 15% of AM50B, and the extrusion process performance is basic suitable with AM50B, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain, 6.5～8.5MPa by AM50B brings up to 32～35MPa, can satisfy the application of this magnesiumalloy at less discharge capacity motorcycle crankcase.

Embodiment 21-embodiment 25 produces the low-cost embodiment that contains the heat resistance magnesium alloy of Ce about die casting.

Embodiment 21: die casting is produced and is used the AZ91D+0.1%Ce magnesium alloy smelting method

1, founding Mg-10%Ce master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-10%Ce master alloy of the present invention;

(3), in preheating oven, pure magnesium ingot is preheating to 360～460 ℃, simultaneously pure Ce ingot is preheating to 360～460 ℃;

(5), the pure Ce ingot after the preheating is submerged in the magnesium melt together with the charging basket that adds that holds them, adding charging basket is that soft steel or high chromium steel are processed, and is thick with a large amount of apertures on it, is convenient to dissolving and the diffusion of Ce;

(6), the magnesium melt temperature is controlled at 720～860 ℃, treat that Ce dissolves fully after, 750～860 ℃ of insulations 10～60 minutes, alloying element Ce is evenly distributed in the magnesium melt again;

(7), last, Mg-Ce master alloy liquation is poured in the permanent mold casting mould of abundant preheating and is frozen into the ingot blank that diameter is Φ 95mm.

2, Mg-10%Ce master alloy ingot blank is squeezed into the bar of Φ 16mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 6300kN, the container diameter is 96mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 2mm～3mm/ second, Mg-10%Ce master alloy ingot blank is squeezed into the bar of Φ 16mm;

3, die casting is produced and is used the AZ91D+0.1%Ce magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 150 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AZ91D+0.1%Ce magnesiumalloy liquation, can carry out die casting production;

This AZ91D+0.1%Ce magnesiumalloy cost is than the about increase by 5% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 120 ℃, 100 hours, producing 0.1% creep strain, 14～17MPa by AZ91D brings up to 28～33MPa, can satisfy the application of this magnesiumalloy on the small displacement engine oil pan below 1.3 liters.

Embodiment 22: die casting is produced and is used the AZ91D+3.0%Ce magnesium alloy smelting method

1, founding Mg-50%Ce master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-50%Ce master alloy of the present invention;

(7), last, Mg-Ce master alloy liquation is transported in the mold, carry out continuously or semicontinuous casting to become diameter be the ingot blank of Φ 300mm.

2, Mg-50%Ce master alloy ingot blank is squeezed into the bar of Φ 60mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 30000kN, the container diameter is 300mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 8mm～10mm/ second, Mg-50%Ce master alloy ingot blank is squeezed into the bar of Φ 60mm;

3, die casting is produced and is used the AZ91D+3.0%Ce magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 10 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AZ91D+3.0%Ce magnesiumalloy liquation, can carry out die casting production;

This AZ91D+3.0%Ce magnesiumalloy cost is than the about increase by 20% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 200 ℃, 100 hours, producing 0.1% creep strain, 5～7MPa by AZ91D brings up to 27～31MPa, can satisfy the application of this magnesiumalloy at 1.6～2.0 liter capacity engine cylinder-bodies.

Embodiment 23: die casting is produced and is used the AZ91D+1.0%Ce magnesium alloy smelting method

1, founding Mg-30%Ce master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-30%Ce master alloy of the present invention;

(7), last, Mg-Ce master alloy liquation is poured in the permanent mold casting mould of abundant preheating and is frozen into the ingot blank that diameter is Φ 200mm.

2, Mg-30%Ce master alloy ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 7mm～9mm/ second, Mg-50%Ce master alloy ingot blank is squeezed into the bar of Φ 40mm;

3, die casting is produced and is used the AZ91D+1.0%Ce magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AZ91D+1.0%Ce magnesiumalloy liquation, can carry out die casting production;

This AZ91D+1.0%Ce magnesiumalloy cost is than the about increase by 10% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain, 9～11MPa by AZ91D brings up to 33～36MPa, can satisfy the application of this magnesiumalloy in the car automatic gear-box.

Embodiment 24: die casting is produced and is used the AM60B+2.0%Ce magnesium alloy smelting method

2, Mg-50%Ce master alloy ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

3, die casting is produced and is used the AM60B+2.0%Ce magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AM60B magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AM60B+2.0%Ce magnesiumalloy liquation, can carry out die casting production;

This AM60B+2.0%Ce magnesiumalloy cost is than the about increase by 15% of AM60B, and the extrusion process performance is basic suitable with AM60B, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain, 7～9MPa by AM60B brings up to 33～35MPa, can satisfy the application of this magnesiumalloy at motorcycle crankcase.

Embodiment 25: die casting is produced and is used the AM50B+2.0%Ce magnesium alloy smelting method

1, founding Mg-60%Ce master alloy ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of Mg-60%Ce master alloy of the present invention;

2, Mg-60%Ce master alloy ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 7mm～9mm/ second, Mg-60%Ce master alloy ingot blank is squeezed into the bar of Φ 40mm;

3, die casting is produced and is used the AM50B+2.0%Ce magnesium alloy smelting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AM60B magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly an AM50B+2.0%Ce magnesiumalloy liquation, can carry out die casting production;

This AM50B+2.0%Ce magnesiumalloy cost is than the about increase by 15% of AM50B, and the extrusion process performance is basic suitable with AM50B, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain, 6.5～8.5MPa by AM50B brings up to 32～35MPa, can satisfy the application of this magnesiumalloy at less discharge capacity motorcycle crankcase.

Embodiment 26-embodiment 30 produces the low-cost embodiment that contains the heat resistance magnesium alloy of rich neodymium mixed rare-earth about die casting.

Embodiment 26: the rich neodymium mixed rare-earth magnesium alloy smelting method with AZ91D+0.1% is produced in die casting

1, the rich neodymium mixed rare-earth master alloy of founding Mg-10% ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of the rich neodymium mixed rare-earth master alloy of Mg-10% of the present invention;

(3), in preheating oven, pure magnesium ingot is preheating to 360～460 ℃, simultaneously pure rich neodymium mixed rare-earth ingot is preheating to 360～460 ℃;

(5), the pure rich neodymium mixed rare-earth ingot after the preheating is submerged in the magnesium melt together with the charging basket that adds that holds them, adding charging basket is that soft steel or high chromium steel are processed, and is thick with a large amount of apertures on it, is convenient to the dissolving and the diffusion of rich neodymium mixed rare-earth;

(6), the magnesium melt temperature is controlled at 720～860 ℃, treat that rich neodymium mixed rare-earth dissolves fully after, again 750～860 ℃ of insulations 10～60 minutes, the rich neodymium mixed rare-earth of alloying element is evenly distributed in the magnesium melt;

(7), last, the rich neodymium mixed rare-earth master alloy of Mg-liquation is poured in the permanent mold casting mould of abundant preheating and is frozen into the ingot blank that diameter is Φ 95mm.

2, the rich neodymium mixed rare-earth master alloy of Mg-10% ingot blank is squeezed into the bar of Φ 16mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 6300kN, the container diameter is 96mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 2mm～3mm/ second, the rich neodymium mixed rare-earth master alloy of Mg-10% ingot blank is squeezed into the bar of Φ 16mm;

3, the rich neodymium mixed rare-earth magnesium alloy smelting with AZ91D+0.1% is produced in die casting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 150 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly the rich neodymium mixed rare-earth magnesiumalloy of an AZ91D+0.1% liquation, can carry out die casting production;

The rich neodymium mixed rare-earth magnesiumalloy of this AZ91D+0.1% cost is than the about increase by 3% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 120 ℃, 100 hours, producing 0.1% creep strain, 14～17MPa by AZ91D brings up to 27～32MPa, can satisfy the application of this magnesiumalloy on the small displacement engine oil pan below 1.0 liters.

Embodiment 27: the rich neodymium mixed rare-earth magnesium alloy smelting method with AZ91D+3.0% is produced in die casting

1, the rich neodymium mixed rare-earth master alloy of founding Mg-50% ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of the rich neodymium mixed rare-earth master alloy of Mg-50% of the present invention;

(7), last, the rich neodymium mixed rare-earth master alloy of Mg-liquation is transported in the mold, carry out continuously or semicontinuous casting to become diameter be the ingot blank of Φ 300mm.

2, the rich neodymium mixed rare-earth master alloy of Mg-50% ingot blank is squeezed into the bar of Φ 60mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 30000kN, the container diameter is 300mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 8mm～10mm/ second, the rich neodymium mixed rare-earth master alloy of Mg-50% ingot blank is squeezed into the bar of Φ 60mm;

3, the rich neodymium mixed rare-earth magnesium alloy smelting with AZ91D+3.0% is produced in die casting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 10 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly the rich neodymium mixed rare-earth magnesiumalloy of an AZ91D+3.0% liquation, can carry out die casting production;

The rich neodymium mixed rare-earth magnesiumalloy of this AZ91D+3.0% cost is than the about increase by 15% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 200 ℃, 100 hours, producing 0.1% creep strain, 5～7MPa by AZ91D brings up to 25～30MPa, can satisfy the application of this magnesiumalloy at 1.0～1.6 liter capacity engine cylinder-bodies.

Embodiment 28: the rich neodymium mixed rare-earth magnesium alloy smelting method with AZ91D+1.0% is produced in die casting

1, the rich neodymium mixed rare-earth master alloy of founding Mg-30% ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of the rich neodymium mixed rare-earth master alloy of Mg-30% of the present invention;

(7), last, the rich neodymium mixed rare-earth master alloy of Mg-liquation is poured in the permanent mold casting mould of abundant preheating and is frozen into the ingot blank that diameter is Φ 200mm.

2, the rich neodymium mixed rare-earth master alloy of Mg-30% ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 7mm～9mm/ second, the rich neodymium mixed rare-earth master alloy of Mg-50% ingot blank is squeezed into the bar of Φ 40mm;

3, the rich neodymium mixed rare-earth magnesium alloy smelting with AZ91D+1.0% is produced in die casting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AZ91D magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly the rich neodymium mixed rare-earth magnesiumalloy of an AZ91D+1.0% liquation, can carry out die casting production;

The rich neodymium mixed rare-earth magnesiumalloy of this AZ91D+1.0% cost is than the about increase by 8% of AZ91D, and the extrusion process performance is basic suitable with AZ91D, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain, 9～11MPa by AZ91D brings up to 32～35MPa, can satisfy the application of this magnesiumalloy in the car automatic gear-box.

Embodiment 29: the rich neodymium mixed rare-earth magnesium alloy smelting method with AM60B+2.0% is produced in die casting

(3), in preheating oven, pure magnesium ingot is preheating to 360～460 ℃, simultaneously pure rich neodymium mixed rare-earth ingot is preheating to 100～350 ℃;

2, the rich neodymium mixed rare-earth master alloy of Mg-50% ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

3, the rich neodymium mixed rare-earth magnesium alloy smelting with AM60B+2.0% is produced in die casting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AM60B magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly the rich neodymium mixed rare-earth magnesiumalloy of an AM60B+2.0% liquation, can carry out die casting production;

The rich neodymium mixed rare-earth magnesiumalloy of this AM60B+2.0% cost is than the about increase by 11% of AM60B, and the extrusion process performance is basic suitable with AM60B, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain, 7～9MPa by AM60B brings up to 32～35MPa, can satisfy the application of this magnesiumalloy at motorcycle crankcase.

Embodiment 30: the rich neodymium mixed rare-earth magnesium alloy smelting method with AM50B+2.0% is produced in die casting

1, the rich neodymium mixed rare-earth master alloy of founding Mg-60% ingot blank, the ingot blank founding comprises the steps:

(1), gets the raw materials ready by the weight percent of the composition of the rich neodymium mixed rare-earth master alloy of Mg-60% of the present invention;

2, the rich neodymium mixed rare-earth master alloy of Mg-60% ingot blank is squeezed into the bar of Φ 40mm, the extruding of bar comprises the steps:

(1), adopt the extrusion machine of 25000kN, the container diameter is 200mm;

(4), the container temperature is 360 ± 5 ℃, the extrusion stem rate of advance is 7mm～9mm/ second, the rich neodymium mixed rare-earth master alloy of Mg-60% ingot blank is squeezed into the bar of Φ 40mm;

3, the rich neodymium mixed rare-earth magnesium alloy smelting with AM50B+2.0% is produced in die casting

(1), the supporting magnesium alloy melting furnace of employing and pressure die-casting machine; With 240 kilograms of traditional AM60B magnesiumalloy fusings; In liquation, add 20 above-mentioned master alloy sections after 120～360 ℃ of preheatings; After treating that the master alloy section melts fully, the liquation of generation is exactly the rich neodymium mixed rare-earth magnesiumalloy of an AM50B+2.0% liquation, can carry out die casting production;

The rich neodymium mixed rare-earth magnesiumalloy of this AM50B+2.0% cost is than the about increase by 11% of AM50B, and the extrusion process performance is basic suitable with AM50B, satisfies the extrusion process requirement; Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain, 6.5～8.5MPa by AM50B brings up to 31～34MPa, can satisfy the application of this magnesiumalloy at less discharge capacity motorcycle crankcase.

Embodiment 31-embodiment 35 produces the low-cost embodiment that contains the heat resistance magnesium alloy of La about die casting.Except that with the La replaced C e, it is identical with embodiment 21-embodiment 25 respectively that magnesium-rare earth melting method is produced in its die casting in embodiment 31-embodiment 35.The test result of embodiment 31-embodiment 35 and useful effect are seen table 1.

Embodiment 36-embodiment 40 produces the low-cost embodiment that contains the heat resistance magnesium alloy of Pr about die casting.Except that with the Pr replaced C e, it is identical with embodiment 21-embodiment 25 respectively that magnesium-rare earth melting method is produced in its die casting in embodiment 36-embodiment 40.The test result of embodiment 36-embodiment 40 and useful effect are seen table 1.

Embodiment 41-embodiment 45 produces the low-cost embodiment that contains the heat resistance magnesium alloy of Sm about die casting.Except that with the Sm replaced C e, it is identical with embodiment 21-embodiment 25 respectively that magnesium-rare earth melting method is produced in its die casting in embodiment 41-embodiment 45.The test result of embodiment 41-embodiment 45 and useful effect are seen table 1.

Embodiment 46-embodiment 50 produces the low-cost embodiment that contains the heat resistance magnesium alloy of Eu about die casting.Except that with the Eu replaced C e, it is identical with embodiment 21-embodiment 25 respectively that magnesium-rare earth melting method is produced in its die casting in embodiment 46-embodiment 50.The test result of embodiment 46-embodiment 50 and useful effect are seen table 1.

Embodiment 51-embodiment 55 produces the low-cost embodiment that contains the heat resistance magnesium alloy of Tb about die casting.Except that with the Tb replaced C e, it is identical with embodiment 21-embodiment 25 with respectively that magnesium-rare earth melting method is produced in its die casting in embodiment 51-embodiment 55.The test result of embodiment 51-embodiment 55 and useful effect are seen table 1.

Embodiment 56-embodiment 60 produces the low-cost embodiment that contains the heat resistance magnesium alloy of Ho about die casting.Except that with the Ho replaced C e, it is identical with embodiment 21-embodiment 25 respectively that magnesium-rare earth melting method is produced in its die casting in embodiment 56-embodiment 60.The test result of embodiment 56-embodiment 60 and useful effect are seen table 1.

Embodiment 61-embodiment 65 produces the low-cost embodiment that contains the heat resistance magnesium alloy of Er about die casting.Except that with the Er replaced C e, it is identical with embodiment 21-embodiment 25 respectively that magnesium-rare earth melting method is produced in its die casting in embodiment 61-embodiment 65.The test result of embodiment 61-embodiment 65 and useful effect are seen table 1.

Embodiment 66-embodiment 70 produces the low-cost embodiment that contains the heat resistance magnesium alloy of Tm about die casting.Except that with the Tm replaced C e, it is identical with embodiment 21-embodiment 25 respectively that magnesium-rare earth melting method is produced in its die casting in embodiment 66-embodiment 70.The test result of embodiment 66-embodiment 70 and useful effect are seen table 1.

Table 1

	Cost	Can satisfy the requirement of die casting fabrication technique	Creep strength	Use
					Embodiment 31	This AZ91D+	Die casting fabrication technique performance	At 120 ℃, 100	This magnesiumalloy can

	0.1%La magnesiumalloy cost is than the about increase by 3% of AZ91D.	Basic suitable with AZ91D, satisfy the extrusion process requirement.	Creep strength when hour long-time load effect produces 0.1% creep strain down by the 14-17MPa of AZ91D, is brought up to 27-32Mpa.	Satisfy the application on the small displacement engine oil pan below 1.0 liters.
					Embodiment 32	This AZ91D+ 3%La magnesiumalloy cost is than the about increase by 20% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
Embodiment 33	This AZ91D+ 1%La magnesiumalloy cost is than the about increase by 10% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
					Embodiment 34	This AM60B+ 2.0%La magnesiumalloy cost is than the about increase by 15% of AM60B.	Die casting fabrication technique performance is basic suitable with AM60B, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain by 7～9MPa of AM60B, is brought up to 33～35 MPa.	This magnesiumalloy can satisfy the application at motorcycle crankcase.
Embodiment 35	This AM50B+ 2.0%La magnesiumalloy cost is than the about increase by 15% of AM50B.	Die casting fabrication technique performance is basic suitable with AM50B, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain, 6.5～8.5 MPa by AM50B bring up to 32～35MPa.	This magnesiumalloy can satisfy the application at less discharge capacity motorcycle crankcase.

Embodiment 36	This AZ91D+ 0.1%Pr magnesiumalloy cost is than the about increase by 3% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 120 ℃, 100 hours, producing 0.1% creep strain, the 14-17MPa by AZ91D brings up to 27-32Mpa.	This magnesiumalloy can satisfy the application on the small displacement engine oil pan below 1.0 liters.
					Embodiment 37	This AZ91D+ 3%Pr magnesiumalloy cost is than the about increase by 20% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
Embodiment 38	This AZ91D+ 1%Pr magnesiumalloy cost is than the about increase by 10% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
					Embodiment 39	This AM60B+ 2.0%Pr magnesiumalloy cost is than the about increase by 15% of AM60B.	Die casting fabrication technique performance is basic suitable with AM60B, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain by 7～9MPa of AM60B, is brought up to 33～35 MPa.	This magnesiumalloy can satisfy the application at motorcycle crankcase.
Embodiment 40	This AM50B+ 2.0%Pr magnesiumalloy cost is than the about increase by 15% of AM50B.	Die casting fabrication technique performance is basic suitable with AM50B, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain, 6.5～8.5 MPa by AM50B bring up to	This magnesiumalloy can satisfy the application at less discharge capacity motorcycle crankcase.

			32～35MPa。
					Embodiment 41	This AZ91D+ 0.1%Sm magnesiumalloy cost is than the about increase by 3% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 120 ℃, 100 hours, producing 0.1% creep strain, the 14-17MPa by AZ91D brings up to 27-32Mpa.	This magnesiumalloy can satisfy the application on the small displacement engine oil pan below 1.0 liters.
Embodiment 42	This AZ91D+ 3%Sm magnesiumalloy cost is than the about increase by 20% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
					Embodiment 43	This AZ91D+ 1%Sm magnesiumalloy cost is than the about increase by 10% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
Embodiment 44	This AM60B+ 2.0%Sm magnesiumalloy cost is than the about increase by 15% of AM60B.	Die casting fabrication technique performance is basic suitable with AM60B, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain by 7～9MPa of AM60B, is brought up to 33～35 MPa.	This magnesiumalloy can satisfy the application at motorcycle crankcase.
					Embodiment 45	This AM50B+ 2.0%Sm magnesiumalloy cost is than the about increase by 15% of AM50B.	Die casting fabrication technique performance is basic suitable with AM50B, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain is by 6.5～8.5 of AM50B	This magnesiumalloy can satisfy the application at less discharge capacity motorcycle crankcase.

			MPa brings up to 32～35MPa.
					Embodiment 46	This AZ91D+ 0.1%Eu magnesiumalloy cost is than the about increase by 3% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 120 ℃, 100 hours, producing 0.1% creep strain, the 14-17MPa by AZ91D brings up to 27-32Mpa.	This magnesiumalloy can satisfy the application on the small displacement engine oil pan below 1.0 liters.
Embodiment 47	This AZ91D+ 3%Eu magnesiumalloy cost is than the about increase by 20% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
					Embodiment 48	This AZ91D+ 1%Eu magnesiumalloy cost is than the about increase by 10% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
Embodiment 49	This AM60B+ 2.0%Eu magnesiumalloy cost is than the about increase by 15% of AM60B.	Die casting fabrication technique performance is basic suitable with AM60B, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain by 7～9MPa of AM60B, is brought up to 33～35 MPa.	This magnesiumalloy can satisfy the application at motorcycle crankcase.
					Embodiment 50	This AM50B+ 2.0%Eu magnesiumalloy cost is than the about increase by 15% of AM50B.	Die casting fabrication technique performance is basic suitable with AM50B, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain is by AM50B	This magnesiumalloy can satisfy the application at less discharge capacity motorcycle crankcase.

			6.5～8.5 MPa, bring up to 32～35MPa.
					Embodiment 51	This AZ91D+ 0.1%Tb magnesiumalloy cost is than the about increase by 3% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 120 ℃, 100 hours, producing 0.1% creep strain, the 14-17MPa by AZ91D brings up to 27-32Mpa.	This magnesiumalloy can satisfy the application on the small displacement engine oil pan below 1.0 liters.
Embodiment 52	This AZ91D+ 3%Tb magnesiumalloy cost is than the about increase by 20% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
					Embodiment 53	This AZ91D+ 1%Tb magnesiumalloy cost is than the about increase by 10% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
Embodiment 54	This AM60B+ 2.0%Tb magnesiumalloy cost is than the about increase by 15% of AM60B.	Die casting fabrication technique performance is basic suitable with AM60B, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain by 7～9MPa of AM60B, is brought up to 33～35 MPa.	This magnesiumalloy can satisfy the application at motorcycle crankcase.
					Embodiment 55	This AM50B+ 2.0%Tb magnesiumalloy cost is than the about increase by 15% of AM50B.	Die casting fabrication technique performance is basic suitable with AM50B, satisfies the extrusion process requirement.	Creep resistance when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain is strong	This magnesiumalloy can satisfy the application at less discharge capacity motorcycle crankcase.

			Degree, 6.5～8.5 MPa by AM50B bring up to 32～35MPa.
					Embodiment 56	This AZ91D+ 0.1%Ho magnesiumalloy cost is than the about increase by 3% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 120 ℃, 100 hours, producing 0.1% creep strain, the 14-17MPa by AZ91D brings up to 27-32Mpa.	This magnesiumalloy can satisfy the application on the small displacement engine oil pan below 1.0 liters.
Embodiment 57	This AZ91D+ 3%Ho magnesiumalloy cost is than the about increase by 20% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
					Embodiment 58	This AZ91D+ 1%Ho magnesiumalloy cost is than the about increase by 10% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
Embodiment 59	This AM60B+ 2.0%Ho magnesiumalloy cost is than the about increase by 15% of AM60B.	Die casting fabrication technique performance is basic suitable with AM60B, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain by 7～9MPa of AM60B, is brought up to 33～35 MPa.	This magnesiumalloy can satisfy the application at motorcycle crankcase.
					Embodiment 60	This AM50B+ 2.0%Ho magnesiumalloy cost is than the about increase by 15% of AM50B.	Die casting fabrication technique performance is basic suitable with AM50B, satisfies the extrusion process requirement.	Under long-time load effect in 175 ℃, 100 hours, produce 0.1% creep strain	This magnesiumalloy can satisfy the application at less discharge capacity motorcycle crankcase.

			The time creep strength, 6.5～8.5 MPa by AM50B bring up to 32～35MPa.
					Embodiment 61	This AZ91D+ 0.1%Er magnesiumalloy cost is than the about increase by 3% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 120 ℃, 100 hours, producing 0.1% creep strain, the 14-17MPa by AZ91D brings up to 27-32Mpa.	This magnesiumalloy can satisfy the application on the small displacement engine oil pan below 1.0 liters.
Embodiment 62	This AZ91D+ 3%Er magnesiumalloy cost is than the about increase by 20% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
					Embodiment 63	This AZ91D+ 1%Er magnesiumalloy cost is than the about increase by 10% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
Embodiment 64	This AM60B+ 2.0%Er magnesiumalloy cost is than the about increase by 15% of AM60B.	Die casting fabrication technique performance is basic suitable with AM60B, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain by 7～9MPa of AM60B, is brought up to 33～35 MPa.	This magnesiumalloy can satisfy the application at motorcycle crankcase.
					Embodiment 65	This AM50B+ 2.0%Er magnesiumalloy cost compares AM50B	Die casting fabrication technique performance is basic suitable with AM50B, satisfies die casting	Under long-time load effect in 175 ℃, 100 hours, produce	This magnesiumalloy can satisfy at less discharge capacity motorcycle bent axle

	Approximately increase by 15%.	Processing requirement.	Creep strength during 0.1% creep strain, 6.5～8.5 MPa by AM50B bring up to 32～35MPa.	The application of case.
					Embodiment 66	This AZ91D+ 0.1%Tm magnesiumalloy cost is than the about increase by 3% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 120 ℃, 100 hours, producing 0.1% creep strain, the 14-17MPa by AZ91D brings up to 27-32Mpa.	This magnesiumalloy can satisfy the application on the small displacement engine oil pan below 1.0 liters.
Embodiment 67	This AZ91D+ 3%Tm magnesiumalloy cost is than the about increase by 20% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
					Embodiment 68	This AZ91D+ 1%Tm magnesiumalloy cost is than the about increase by 10% of AZ91D.	Die casting fabrication technique performance is basic suitable with AZ91D, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 150 ℃, 100 hours, producing 0.1% creep strain by 9～11MPa of AZ91D, is brought up to 33～36 MPa.	This magnesiumalloy can satisfy the application in the car automatic gear-box.
Embodiment 69	This AM60B+ 2.0%Tm magnesiumalloy cost is than the about increase by 15% of AM60B.	Die casting fabrication technique performance is basic suitable with AM60B, satisfies the extrusion process requirement.	Creep strength when under long-time load effect in 175 ℃, 100 hours, producing 0.1% creep strain by 7～9MPa of AM60B, is brought up to 33～35 MPa.	This magnesiumalloy can satisfy the application at motorcycle crankcase.
					Embodiment 70	This AM50B+ 2.0%Tm magnesiumalloy	Basic and the AM50B of die casting fabrication technique performance	175 ℃, 100 hours long-time loads	This magnesiumalloy can satisfy than float

Cost is than the about increase by 15% of AM50B.

Quite, satisfy the extrusion process requirement.

Creep strength when effect produces 0.1% creep strain down by 6.5～8.5 MPa of AM50B, is brought up to 32～35MPa.

The application of amount motorcycle crankcase.

The foregoing description proves absolutely; Interpolation element La, Pr, Sm, Eu, Tb, Ho, Er, Tm, Dy, Gd, Ce, Y and cerium-rich mischmetal, rich neodymium mixed rare-earth are 0.10～3.0 weight % of AZ91D, AM50B or AM60B magnesiumalloy amount by add-on; Add in AZ91D, AM50B or the AM60B magnesiumalloy; Can improve the resistance toheat of magnesiumalloy; The above-mentioned effect that these add element La, Pr, Sm, Eu, Tb, Ho, Er, Tm, Dy, Gd, Ce, Y and cerium-rich mischmetal, rich neodymium mixed rare-earth all is identical, can both improve magnesiumalloy at 120 ℃～200 ℃ creep-resistant property.

Claims

1. a low cost contains the heat resistance magnesium alloy of rare earth; It is characterized in that: this heat resistance magnesium alloy is in AZ91D, AM50B or AM60B liquation, to add the Mg-rare earth intermediate alloy; Form through die casting, wherein, the add-on of the rare earth of Mg-rare earth intermediate alloy is 0.10～3.0 weight % of AZ91D, AM50B or AM60B magnesiumalloy amount; Described rare earth is any one in La, Pr, Sm, Eu, Tb, Ho, Er, Tm, Dy, Gd, Ce, cerium-rich mischmetal and the rich neodymium mixed rare-earth; Wherein, cerium-rich mischmetal be the content of Ce more than 40 weight %, all the other are other REEs; The content that rich neodymium mixed rare-earth is Nd is more than 40 weight %, and all the other are other REEs; This magnesiumalloy is to adopt following method preparation:

The first step, founding Mg-10～60 weight % rare earth intermediate alloy ingot blanks;

In second step, Mg-10～60 weight % rare earth intermediate alloy ingot blanks are squeezed into wire rod or the bar of Φ 2mm～Φ 60mm;

The 3rd step; With traditional AZ91D, AM50B or the fusing of AM60B magnesiumalloy; Add-on by the rare earth of Mg-rare earth intermediate alloy is 0.10～3.0 weight % of AZ91D, AM50B or AM60B magnesiumalloy amount, and the wire rod or the bar of Mg-10～60 weight % rare earth intermediate alloys are cut into chunks, and again Mg-rare earth intermediate alloy section is preheating to 120～360 ℃; Add then in AZ91D, AM50B or the AM60B liquation, be cast into heat resistance magnesium alloy.

2. prepare the method for the described heat resistance magnesium alloy of claim 1, it is characterized in that: this method comprises following process:

3. the method for heat resistance magnesium alloy according to claim 2, it is characterized in that: described the first step process comprises the steps:

(1), with pure magnesium ingot and pure rare earth ingot or mishmetal ingot; Weight percent by the composition of Mg-10～60 weight % rare earth intermediate alloys is got the raw materials ready; Rare earth in the described pure rare earth ingot is any one among La, Pr, Sm, Eu, Tb, Ho, Er, Tm, Dy, Gd, the Ce, and the mishmetal in the described mishmetal ingot is cerium-rich mischmetal or rich neodymium mixed rare-earth, wherein; Cerium-rich mischmetal be the content of Ce more than 40 weight %, all the other are other REEs; The content that rich neodymium mixed rare-earth is Nd is more than 40 weight %, and all the other are other REEs;

4. according to the method for claim 2 or 3 described heat resistance magnesium alloys, it is characterized in that: the described second step process comprises the steps:

(1), master alloy wire rod or the diameter of bar of preparation as required, confirm the diameter of extruding with ingot blank, definite principle of ingot blank diameter be the assurance extrusion ratio greater than 10, wherein, extrusion ratio is the cross-sectional area ÷ wire rod of ingot blank or the cross-sectional area of bar;

(2), adopt Vehicle Processing with ingot blank surface car light, ingot blank diameter and length are worked into extrusion machine internal diameter of the container and length are complementary simultaneously, blank diameter is than the little 3～8mm of internal diameter of the container, charge length is 1.5～3.0 times of blank diameter;

5. the method for heat resistance magnesium alloy according to claim 4 is characterized in that: in described the 3rd step process, described AZ91D, AM50B or the fusing of AM60B magnesiumalloy be with the supporting magnesium alloy melting furnace of pressure die-casting machine in carry out.

6. the method for heat resistance magnesium alloy according to claim 5; It is characterized in that: in described the 3rd step process; Described with the wire rod of Mg-10～60 weight % rare earth intermediate alloys or the step that bar is cut into chunks; Be according to the requirement of diecast parts, need confirm the rare earth alloy element and the content of rare earth of interpolation the magnesiumalloy resistance toheat; And according to the rare earth content that will add, select the content of Mg-rare earth intermediate alloy middle-weight rare earths and the diameter of master alloy wire rod or bar for use; And the rare earth content, the content of Mg-rare earth intermediate alloy middle-weight rare earths and the diameter of master alloy wire rod or bar that add according to remelting ingot casting weight specification, heat resistance magnesium alloy needs; Master alloy wire rod or rod length fixing are cut into chunks; Wherein, the content of the rare earth in every section master alloy wire rod or the bar is the weight of the adding of every block of rare earth in the remelting ingot casting.