CN109468513A - A kind of high-strength temperature-resistant casting magnesium-rare earth alloy and preparation method thereof - Google Patents

A kind of high-strength temperature-resistant casting magnesium-rare earth alloy and preparation method thereof Download PDF

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CN109468513A
CN109468513A CN201811550162.7A CN201811550162A CN109468513A CN 109468513 A CN109468513 A CN 109468513A CN 201811550162 A CN201811550162 A CN 201811550162A CN 109468513 A CN109468513 A CN 109468513A
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rare earth
magnesium
earth alloy
temperature
alloy
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周北平
刘文才
吴国华
张亮
肖然
张秋
丁文江
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon

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  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Continuous Casting (AREA)
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Abstract

The present invention provides a kind of high-strength temperature-resistant casting magnesium-rare earth alloy and preparation method thereof, the mass percents of the alloy each component are as follows: 4~16wt.%Gd, 0.2~6wt.%Er, 0.2~6wt.%Sm, Gd+Er+Sm:6~21wt%, 0~1wt.%Zr, surplus Mg.The preparation method of the magnesium-rare earth alloy includes melting and two stages of heat treatment, wherein smelt stage is carried out under conditions of gas shield, and heat treatment stages include double_stage guide processing and two-stage time effect processing.The present invention can significantly refine crystal grain by introducing Er element, change the dendritic morphology of alloy, improve the mechanical property of alloy；Alloying is carried out by introducing Sm element, high-melting-point hardening constituent is generated, there is good refinement crystal grain and solid solution strengthening effect, can get the excellent heat resistance casting magnesium alloy of room temperature, mechanical behavior under high temperature.

Description

A kind of high-strength temperature-resistant casting magnesium-rare earth alloy and preparation method thereof
Technical field
The invention belongs to technical field of metal material, it is related to a kind of magnesium-rare earth alloy and preparation method thereof, and in particular, to A kind of high-strength temperature-resistant casting magnesium-rare earth alloy and preparation method thereof.
Background technique
Magnesium alloy is structural metallic materials most light in industrial application, has density low, specific stiffness and the high spy of specific strength Property, while there is very high vibration damping capacity, excellent machinability.As structural material, magnesium alloy is in low temperature item Have under part and has been widely applied.But the mechanical behavior under high temperature of ordinary magnesium alloy is poor, constrains it in aerospace, automobile Application in equal fields.The better magnesium alloy of researching high-temperature mechanical property is the important topic of magnesium alloy research.It adds suitable Rare earth element can be obviously improved the mechanical behavior under high temperature of magnesium alloy.
For traditional Mg-Gd-Y system alloy, Chen Zhi etc. has found to prolong with the increase of Y content, the tensile strength of tested alloys Stretching rate reduces.When the content that Y is added is 1wt%, the tensile strength of alloy, elongation have maximum value, respectively 221MPa With 5.6%.When Y content reaches 5wt%, tensile strength is decreased obviously.This is because when Y too high levels, the quantity of precipitated phase Increase, generate segregation, Yi Yinqi stress is concentrated, and is reduced so as to cause the tensile strength and elongation of cast alloy.In addition, Y contains Measure excessively high, the viscosity of aluminium alloy increases when casting, and mobility reduces, and as-cast structure is uneven, and the mechanical properties decrease of alloy is (old Influence [D] Henan of the will .Y content to Mg-Gd-Y-Sm-Zr alloy structure and performance: University Of Science and Technology Of He'nan, 2014).It therefore can To consider to replace Y with other rare earth elements.
Although studies have shown that if the compound addition magnesium alloy of two or more rare earth elements for belonging to different weight rare earths In, can develop low in cost, room temperature and the excellent magnesium alloy of mechanical behavior under high temperature, but the report of the pertinent literature without Y compared with It is few, in addition, heat treatment process parameter is also more outmoded, it is badly in need of developing a kind of height without Y of heat treatment process parameter optimization Strong heat-resistant cast magnesium-rare earth alloy.
Summary of the invention
For deficiency existing for existing magnesium-rare earth alloy, the object of the present invention is to provide a kind of high-strength temperature-resistants to cast magnesium rare earth Alloy and preparation method thereof needs to carry out a variety of rare earth element mixing and excellent to obtain higher intensity, better heat resistance Change heat treatment process.The present invention uses Gd for the first component, because Gd is in the solid solubility of Mg solid solution at 200 DEG C 3.82wt%, to guarantee that alloy obtains good Precipitation reinforcing and solid solution strength effect, the additional amount of Gd are not less than 4wt%, meanwhile, to avoid cost of alloy and density from increasing, too many and alloy is excessively brittle, and the additional amount of Gd is not higher than 16wt%；It uses Er, Sm for second and third component, solid solubility of the Gd in Mg can be reduced, so that the Precipitation for increasing Gd is strong Change effect, while the appearance of timeliness peak value of hardness can also be shifted to an earlier date, and because maximum solid solution degree of the Sm in Mg is 5.8wt%, Therefore the additional amount of Er, Sm should be not higher than 6wt%.Simultaneously to reduce cost, rare earth element additive amount does not answer excessively high, Gd+Er+Sm It should be in 6wt% to 21wt%.Using Zr as grain refiner, to improve the toughness of alloy and improve the craftsmanship of alloy Energy.A kind of high-strength temperature-resistant casting magnesium-rare earth alloy is prepared after Overheating Treatment (double_stage guide processing+two-stage time effect processing).
The purpose of the present invention is achieved through the following technical solutions:
The present invention provides a kind of high-strength temperature-resistant casting magnesium-rare earth alloy, and the alloy is each by following percentage Element composition:
Gd is 4~16wt.%；
Er is 0.2~6wt.%；
Sm is 0.2~6wt.%；
And the total amount of Gd, Er and Sm are as follows: 6~21wt%；
Zr is 0~1wt.%；
Surplus is Mg.
The present invention passes through while adding Gd, Sm, Er and Zr, has refined crystallite dimension, has introduced high-temperature stable hardening constituent Mg41 (Sm, Er)5Enhance matrix, through subsequent heat treatment (double_stage guide processing+two-stage time effect processing) further reinforced alloys.
Preferably, the Gd is 9~16wt.%.
Preferably, the Zr is 0.1~0.25wt.%.
The present invention also provides a kind of preparation methods of high-strength temperature-resistant casting magnesium-rare earth alloy, and the preparation method includes melting And heat treatment.
Preferably, the melting includes the following steps:
S1, take pure Mg, Mg-Gd, Mg-Er, Mg-Sm and Mg-Zr intermediate alloy in 160 DEG C~240 DEG C pre-heating dryings respectively；
S2, under the conditions of protecting gas, will be after step S1 treated all melting sources, temperature rises to 650 DEG C~700 DEG C stirring 1~5min；
S3, the melt temperature obtained after step S1 processing is risen to 670 DEG C~720 DEG C 5~10min of standings heat preservation；
S4, wait stand heat preservation after, be in 160 DEG C~240 DEG C of metal type dies by melt cast to preheating temperature, Obtain magnesium-rare earth alloy ingot casting.
Preferably, the protection gas is argon gas or SF6And CO2Mixed gas.
Preferably, the heat treatment include the following steps: will be smelting after obtained magnesium-rare earth alloy ingot casting successively carry out Solution treatment and ageing treatment.It is highly preferred that the magnesium-rare earth alloy ingot casting obtained after will be smelting successively carries out at double_stage guide Reason and two-stage time effect processing.
Preferably, the step of solution treatment are as follows: first in 500~540 DEG C of 4~12h of solution treatment, then 300~ 350 DEG C of solution treatment 0h~10h；Carry out air-cooled processing after solution treatment respectively twice.
Preferably, the step of ageing treatment are as follows: then first 50~100h of timeliness under the conditions of 170~250 DEG C exists 0~50h of timeliness under the conditions of 100~170 DEG C；Carry out air-cooled processing after timeliness respectively twice.Temperature is excessively high or overlong time can be sent out Raw overaging, influences the intensity of material.It is too low or too short, the effect of solution strengthening or timeliness is not achieved.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1. present invention introduces Er elements can significantly refine crystal grain, change the dendritic morphology of alloy, improves the mechanical property of alloy Energy；It introduces Sm element and carries out alloying, generate high-melting-point hardening constituent Mg41Sm5, there is good refinement crystal grain and solution strengthening to imitate Fruit can get the excellent heat resistance magnesium alloy of room temperature, mechanical behavior under high temperature；
2. the present invention is carried out at double_stage guide processing and two-stage time effect by casting magnesium-rare earth alloy to a kind of high-strength temperature-resistant Reason, can give full play to solution strengthening and the effect of timeliness；
3. heat treatment method of the invention compared with traditional T6 heat treatment process, uses air-cooled technique after solid solution and timeliness Instead of water quenching, avoid casting because too fast cooling velocity to cause each section to be shunk uneven, formed big internal stress to Caused by deformation and cracking phenomena, yield rate be greatly improved；
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention Protection scope.
Casting magnesium-rare earth alloy of a kind of high-strength temperature-resistant provided by following embodiment and preparation method thereof, the alloy each group The mass percent divided are as follows: 4~16wt.%Gd, 0.2~6wt.%Er, 0.2~6wt.%Sm, Gd+Er+Sm:6~21wt%, 0~1wt.%Zr, surplus Mg.The wt.% refers to that component accounts for the percentage of prepared alloy gross mass.
The present invention uses Gd for the first component, because Gd is 3.82wt% in the solid solubility of Mg solid solution at 200 DEG C, is Guaranteeing that alloy obtains good Precipitation reinforcing and solid solution strength effect, the additional amount of Gd is not less than 4wt%, meanwhile, to keep away Exempt from cost of alloy and density increases too much and alloy is excessively brittle, the additional amount of Gd is not higher than 16wt%；Use Er, Sm Two, three component can reduce solid solubility of the Gd in Mg, to increase the Precipitation strengthening effect of Gd, while can also mention The appearance of preceding timeliness peak value of hardness, and because maximum solid solution degree of the Sm in Mg is 5.8wt%, the additional amount of Er, Sm are answered Not higher than 6wt%.Simultaneously to reduce cost, rare earth element additive amount is not answered excessively high, and Gd+Er+Sm should be in 6wt% to 21wt% It is interior.Using Zr as the 4th component, to improve the toughness of alloy and improve the processing performance of alloy.
Following embodiment additionally provides a kind of preparation method of high-strength temperature-resistant casting magnesium-rare earth alloy, the preparation method packet Include melting and two stages of heat treatment.
Preferably, the smelt stage the following steps are included:
1. baking material: taking pure Mg, Mg-Gd, Mg-Er, Mg-Sm and Mg-Zr intermediate alloy in 160 DEG C~240 DEG C baking ovens respectively Middle 2~3h of pre-heating drying.
2. charging: all raw materials after above-mentioned preheating are put into crucible together, meanwhile, metal type dies are put into molten Designated position in furnace.
3. filling protective gas: being filled with protective gas argon gas or SF into melting furnace chamber6And CO2Mixed gas.
4. melting and stirring: beginning to warm up the melting sources in crucible after the completion of inflate is liquid, to melting sources Afterwards, 1~5min of mechanical stirring is carried out when temperature rises to 650 DEG C~700 DEG C.
5. standing heat preservation: after mechanical stirring, melt temperature stands 5~10min of heat preservation when rising to 670 DEG C~720 DEG C.
6. casting: after standing heat preservation, the metal pattern die for being 160 DEG C~240 DEG C by melt cast to preheating temperature In tool, magnesium-rare earth alloy ingot casting is obtained.
Preferably, the heat treatment stages use following steps: magnesium-rare earth alloy ingot prepared by the smelting stage is successively Carry out solution treatment and ageing treatment.
1. double_stage guide is handled: first in 500~540 DEG C of 4~12h of solution treatment, then in 300~350 DEG C of solution treatment 0h~10h.Air-cooled processing is carried out respectively after being dissolved twice.
2. two-stage time effect is handled: 50~100h of timeliness under the conditions of 170~250 DEG C, then under the conditions of 100~170 DEG C 0~50h of timeliness.Carry out air-cooled processing after timeliness respectively twice.
Comparative example 1
A kind of high-strength temperature-resistant casting its each component mass percent of magnesium-rare earth alloy are as follows: 16wt.%Gd, 5wt.%Er, 0wt.%Sm, 1wt.%Zr, surplus Mg.
What is carried out first is smelt stage, and entire fusion process is carried out in electric induction furnace under the conditions of protective atmosphere :
1. baking material: taking pure Mg, Mg-Gd, Mg-Er and Mg-Zr intermediate alloy pre-heating drying 3h in 180 DEG C of baking ovens respectively.
2. charging: all raw materials after above-mentioned preheating are put into crucible together, meanwhile, metal type dies are put into molten Designated position in furnace.
3. filling protective gas: being filled with protective gas argon gas into melting furnace chamber.
4. melting and stirring: beginning to warm up the melting sources in crucible after the completion of inflate is liquid, to melting sources Afterwards, mechanical stirring 4min is carried out when temperature rises to 660 DEG C.
5. standing heat preservation: after mechanical stirring, melt temperature stands heat preservation 8min when rising to 690 DEG C.
6. casting: after standing heat preservation, in the metal type dies for being 180 DEG C by melt cast to preheating temperature, obtaining Obtain magnesium-rare earth alloy ingot casting.
Preferably, the heat treatment stages use following steps: magnesium-rare earth alloy ingot prepared by the smelting stage is successively Carry out double_stage guide processing and two-stage time effect processing.
1. double_stage guide is handled: first in 500 DEG C of solution treatment 12h, then in 350 DEG C of solution treatment 0h.It is carried out after solid solution Air-cooled processing.
2. two-stage time effect is handled: first timeliness 100h, then timeliness 0h under the conditions of 170 DEG C under the conditions of 250 DEG C.After timeliness Carry out air-cooled processing.
The room-temperature mechanical property of high-strength temperature-resistant casting magnesium-rare earth alloy are as follows:
Room temperature: yield strength 201.6MPa, tensile strength 230.7MPa, elongation percentage 1.5%.
250 DEG C: yield strength 220.8MPa, tensile strength 270.6MPa, elongation percentage 4.5%
Comparative example 2
A kind of high-strength temperature-resistant casting its each component mass percent of magnesium-rare earth alloy are as follows: 16wt.%Gd, 5wt.%Er, 0wt.%Sm, 1wt.%Zr, surplus Mg.
What is carried out first is smelt stage, and entire fusion process is carried out in electric induction furnace under the conditions of protective atmosphere :
1. baking material: taking pure Mg, Mg-Gd, Mg-Er and Mg-Zr intermediate alloy pre-heating drying 3h in 180 DEG C of baking ovens respectively.
2. charging: all raw materials after above-mentioned preheating are put into crucible together, meanwhile, metal type dies are put into molten Designated position in furnace.
3. filling protective gas: being filled with protective gas argon gas into melting furnace chamber.
4. melting and stirring: beginning to warm up the melting sources in crucible after the completion of inflate is liquid, to melting sources Afterwards, mechanical stirring 4min is carried out when temperature rises to 660 DEG C.
5. standing heat preservation: after mechanical stirring, melt temperature stands heat preservation 8min when rising to 690 DEG C.
6. casting: after standing heat preservation, in the metal type dies for being 180 DEG C by melt cast to preheating temperature, obtaining Obtain magnesium-rare earth alloy ingot casting.
Preferably, the heat treatment stages use following steps: magnesium-rare earth alloy ingot prepared by the smelting stage is successively Carry out double_stage guide processing and two-stage time effect processing.
1. double_stage guide is handled: first in 500 DEG C of solution treatment 12h, then in 350 DEG C of solution treatment 10h.After being dissolved twice Air-cooled processing is carried out respectively.
2. two-stage time effect is handled: first timeliness 100h, then timeliness 50h under the conditions of 170 DEG C under the conditions of 250 DEG C.Twice Air-cooled processing is carried out after timeliness respectively.
The room-temperature mechanical property of high-strength temperature-resistant casting magnesium-rare earth alloy are as follows:
Room temperature: yield strength 210.5MPa, tensile strength 240.8MPa, elongation percentage 2.1%.
250 DEG C: yield strength 227.9MPa, tensile strength 280.2MPa, elongation percentage 5.2%
Embodiment 1
A kind of high-strength temperature-resistant casting its each component mass percent of magnesium-rare earth alloy are as follows: 4wt.%Gd, 6wt.%Er, 6wt.%Sm, 1wt.%Zr, surplus Mg.
What is carried out first is smelt stage, and entire fusion process is carried out in electric induction furnace under the conditions of protective atmosphere :
1. baking material: pure Mg, Mg-Gd, Mg-Er, Mg-Sm and Mg-Zr intermediate alloy being taken to preheat baking in 180 DEG C of baking ovens respectively Dry 3h.
2. charging: all raw materials after above-mentioned preheating are put into crucible together, meanwhile, metal type dies are put into molten Designated position in furnace.
3. filling protective gas: being filled with protective gas argon gas into melting furnace chamber.
4. melting and stirring: beginning to warm up the melting sources in crucible after the completion of inflate is liquid, to melting sources Afterwards, mechanical stirring 4min is carried out when temperature rises to 670 DEG C.
5. standing heat preservation: after mechanical stirring, melt temperature stands heat preservation 8min when rising to 680 DEG C.
6. casting: after standing heat preservation, in the metal type dies for being 180 DEG C by melt cast to preheating temperature, obtaining Obtain magnesium-rare earth alloy ingot casting.
Preferably, the heat treatment stages use following steps: magnesium-rare earth alloy ingot prepared by the smelting stage is successively Carry out double_stage guide processing and two-stage time effect processing.
1. double_stage guide is handled: first in 500 DEG C of solution treatment 12h, then in 350 DEG C of solution treatment 5h.After being dissolved twice Air-cooled processing is carried out respectively.
2. two-stage time effect is handled: first timeliness 100h, then timeliness 20h under the conditions of 170 DEG C under the conditions of 200 DEG C.Twice Air-cooled processing is carried out after timeliness respectively.
The room-temperature mechanical property of high-strength temperature-resistant casting magnesium-rare earth alloy are as follows:
Room temperature: yield strength 213.6MPa, tensile strength 252.1MPa, elongation percentage 2.9%.
250 DEG C: yield strength 253.1MPa, tensile strength 294.3MPa, elongation percentage 6.1%
Embodiment 2
A kind of high-strength temperature-resistant casting its each component mass percent of magnesium-rare earth alloy are as follows: 15wt.%Gd, 1wt.%Er, 1wt.%Sm, 0.5wt.%Zr, surplus Mg.
What is carried out first is smelt stage, and entire fusion process is carried out in electric induction furnace under the conditions of protective atmosphere :
1. baking material: pure Mg, Mg-Gd, Mg-Er, Mg-Sm and Mg-Zr intermediate alloy being taken to preheat baking in 180 DEG C of baking ovens respectively Dry 3h.
2. charging: all raw materials after above-mentioned preheating are put into crucible together, meanwhile, metal type dies are put into molten Designated position in furnace.
3. filling protective gas: being filled with protective gas argon gas into melting furnace chamber.
4. melting and stirring: beginning to warm up the melting sources in crucible after the completion of inflate is liquid, to melting sources Afterwards, mechanical stirring 4min is carried out when temperature rises to 660 DEG C.
5. standing heat preservation: after mechanical stirring, melt temperature stands heat preservation 8min when rising to 690 DEG C.
6. casting: after standing heat preservation, in the metal type dies for being 180 DEG C by melt cast to preheating temperature, obtaining Obtain magnesium-rare earth alloy ingot casting.
Preferably, the heat treatment stages use following steps: magnesium-rare earth alloy ingot prepared by the smelting stage is successively Carry out double_stage guide processing and two-stage time effect processing.
1. double_stage guide is handled: first in 500 DEG C of solution treatment 12h, then in 350 DEG C of solution treatment 5h.After being dissolved twice Air-cooled processing is carried out respectively.
2. two-stage time effect is handled: first timeliness 100h, then timeliness 20h under the conditions of 170 DEG C under the conditions of 200 DEG C.Twice Air-cooled processing is carried out after timeliness respectively.
The room-temperature mechanical property of high-strength temperature-resistant casting magnesium-rare earth alloy are as follows:
Room temperature: yield strength 220.1MPa, tensile strength 234.6MPa, elongation percentage 1.7%.
250 DEG C: yield strength 262.4MPa, tensile strength 285.3MPa, elongation percentage 6.2%
Embodiment 3
A kind of high-strength temperature-resistant casting its each component mass percent of magnesium-rare earth alloy are as follows: 10wt.%Gd, 2wt.%Er, 2wt.%Sm, 0.5wt.%Zr, surplus Mg.
What is carried out first is smelt stage, and entire fusion process is carried out in electric induction furnace under the conditions of protective atmosphere :
1. baking material: pure Mg, Mg-Gd, Mg-Er, Mg-Sm and Mg-Zr intermediate alloy being taken to preheat baking in 180 DEG C of baking ovens respectively Dry 3h.
2. charging: all raw materials after above-mentioned preheating are put into crucible together, meanwhile, metal type dies are put into molten Designated position in furnace.
3. filling protective gas: being filled with protective gas argon gas into melting furnace chamber.
4. melting and stirring: beginning to warm up the melting sources in crucible after the completion of inflate is liquid, to melting sources Afterwards, mechanical stirring 4min is carried out when temperature rises to 660 DEG C.
5. standing heat preservation: after mechanical stirring, melt temperature stands heat preservation 8min when rising to 690 DEG C.
6. casting: after standing heat preservation, in the metal type dies for being 180 DEG C by melt cast to preheating temperature, obtaining Obtain magnesium-rare earth alloy ingot casting.
Preferably, the heat treatment stages use following steps: magnesium-rare earth alloy ingot prepared by the smelting stage is successively Carry out double_stage guide processing and two-stage time effect processing.
1. double_stage guide is handled: first in 500 DEG C of solution treatment 12h, then in 350 DEG C of solution treatment 5h.After being dissolved twice Air-cooled processing is carried out respectively.
2. two-stage time effect is handled: first timeliness 100h, then timeliness 20h under the conditions of 170 DEG C under the conditions of 200 DEG C.Twice Air-cooled processing is carried out after timeliness respectively.
The room-temperature mechanical property of high-strength temperature-resistant casting magnesium-rare earth alloy are as follows:
Room temperature: yield strength 237.5MPa, tensile strength 347.2MPa, elongation percentage 3.2%.
250 DEG C: yield strength 251.8MPa, tensile strength 360.4MPa, elongation percentage 7.8%
Embodiment 4
A kind of high-strength temperature-resistant casting its each component mass percent of magnesium-rare earth alloy are as follows: 12wt.%Gd, 2wt.%Er, 2wt.%Sm, 0.5wt.%Zr, surplus Mg.
What is carried out first is smelt stage, and entire fusion process is carried out in electric induction furnace under the conditions of protective atmosphere :
1. baking material: pure Mg, Mg-Gd, Mg-Er, Mg-Sm and Mg-Zr intermediate alloy being taken to preheat baking in 180 DEG C of baking ovens respectively Dry 3h.
2. charging: all raw materials after above-mentioned preheating are put into crucible together, meanwhile, metal type dies are put into molten Designated position in furnace.
3. filling protective gas: being filled with protective gas argon gas into melting furnace chamber.
4. melting and stirring: beginning to warm up the melting sources in crucible after the completion of inflate is liquid, to melting sources Afterwards, mechanical stirring 4min is carried out when temperature rises to 660 DEG C.
5. standing heat preservation: after mechanical stirring, melt temperature stands heat preservation 8min when rising to 690 DEG C.
6. casting: after standing heat preservation, in the metal type dies for being 180 DEG C by melt cast to preheating temperature, obtaining Obtain magnesium-rare earth alloy ingot casting.
Preferably, the heat treatment stages use following steps: magnesium-rare earth alloy ingot prepared by the smelting stage is successively Carry out double_stage guide processing and two-stage time effect processing.
1. double_stage guide is handled: first in 500 DEG C of solution treatment 12h, then in 350 DEG C of solution treatment 5h.After being dissolved twice Air-cooled processing is carried out respectively.
2. two-stage time effect is handled: first timeliness 100h, then timeliness 20h under the conditions of 170 DEG C under the conditions of 200 DEG C.Twice Air-cooled processing is carried out after timeliness respectively.
The room-temperature mechanical property of high-strength temperature-resistant casting magnesium-rare earth alloy are as follows:
Room temperature: yield strength 301.4MPa, tensile strength 334.7MPa, elongation percentage 5.2%.
250 DEG C: yield strength 310.9MPa, tensile strength 354.2MPa, elongation percentage 8.3%.
Embodiment 5
A kind of high-strength temperature-resistant casting its each component mass percent of magnesium-rare earth alloy are as follows: 12wt.%Gd, 2wt.%Er, 1wt.%Sm, 0.5wt.%Zr, surplus Mg.
What is carried out first is smelt stage, and entire fusion process is carried out in electric induction furnace under the conditions of protective atmosphere :
1. baking material: pure Mg, Mg-Gd, Mg-Er, Mg-Sm and Mg-Zr intermediate alloy being taken to preheat baking in 180 DEG C of baking ovens respectively Dry 3h.
2. charging: all raw materials after above-mentioned preheating are put into crucible together, meanwhile, metal type dies are put into molten Designated position in furnace.
3. filling protective gas: being filled with protective gas argon gas into melting furnace chamber.
4. melting and stirring: beginning to warm up the melting sources in crucible after the completion of inflate is liquid, to melting sources Afterwards, mechanical stirring 4min is carried out when temperature rises to 660 DEG C.
5. standing heat preservation: after mechanical stirring, melt temperature stands heat preservation 8min when rising to 690 DEG C.
6. casting: after standing heat preservation, in the metal type dies for being 180 DEG C by melt cast to preheating temperature, obtaining Obtain magnesium-rare earth alloy ingot casting.
Preferably, the heat treatment stages use following steps: magnesium-rare earth alloy ingot prepared by the smelting stage is successively Carry out double_stage guide processing and two-stage time effect processing.
1. double_stage guide is handled: first in 500 DEG C of solution treatment 12h, then in 350 DEG C of solution treatment 5h.After being dissolved twice Air-cooled processing is carried out respectively.
2. two-stage time effect is handled: first timeliness 100h, then timeliness 10h under the conditions of 170 DEG C under the conditions of 200 DEG C.Twice Air-cooled processing is carried out after timeliness respectively.
The room-temperature mechanical property of high-strength temperature-resistant casting magnesium-rare earth alloy are as follows:
Room temperature: yield strength 285.2MPa, tensile strength 325.7MPa, elongation percentage 6.3%.
250 DEG C: yield strength 302.4MPa, tensile strength 351.8MPa, elongation percentage 9.1%.
Embodiment 6
This implementation provides a kind of high-strength temperature-resistant casting magnesium-rare earth alloy, each component mass percent in the alloy are as follows: 9wt.%Gd, 6wt.%Er, 6wt.%Sm, 1wt.%Zr, surplus Mg.The preparation method and embodiment 1 of the present embodiment alloy Unanimously.
The room-temperature mechanical property of high-strength temperature-resistant casting magnesium-rare earth alloy are as follows:
Room temperature: yield strength 242.3MPa, tensile strength 287.9MPa, elongation percentage 3.5%.
250 DEG C: yield strength 257.3MPa, tensile strength 318.2MPa, elongation percentage 7.9%.
Embodiment 7
This implementation provides a kind of high-strength temperature-resistant casting magnesium-rare earth alloy, each component mass percent in the alloy are as follows: 12wt.%Gd, 2wt.%Er, 1wt.%Sm, 0.2wt.%Zr, surplus Mg.The preparation method and implementation of the present embodiment alloy Example 5 is consistent.
The room-temperature mechanical property of high-strength temperature-resistant casting magnesium-rare earth alloy are as follows:
Room temperature: yield strength 290.4MPa, tensile strength 336.2MPa, elongation percentage 5.4%.
250 DEG C: yield strength 314.6MPa, tensile strength 382.3MPa, elongation percentage 11.2%.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase Mutually combination.

Claims (8)

1. a kind of high-strength temperature-resistant casts magnesium-rare earth alloy, which is characterized in that the alloy is each by following percentage Element composition:
Gd is 4~16wt.%；
Er is 0.2~6wt.%；
Sm is 0.2~6wt.%；
And the total amount of Gd, Er and Sm are as follows: 6~21wt%；
Zr is 0~1wt.%；
Surplus is Mg.
2. high-strength temperature-resistant according to claim 1 casts magnesium-rare earth alloy, which is characterized in that the Gd is 9~ 16wt.%.
3. high-strength temperature-resistant according to claim 1 casts magnesium-rare earth alloy, which is characterized in that the Zr is 0.1~ 0.25wt.%.
4. a kind of preparation method of high-strength temperature-resistant casting magnesium-rare earth alloy according to claim 1, which is characterized in that described Preparation method includes melting and heat treatment.
5. the preparation method of high-strength temperature-resistant casting magnesium-rare earth alloy according to claim 4, which is characterized in that the melting Include the following steps:
S1, take pure Mg, Mg-Gd, Mg-Er, Mg-Sm and Mg-Zr intermediate alloy in 160 DEG C~240 DEG C pre-heating dryings respectively；
S2, under the conditions of protecting gas, will be after step S1 treated all melting sources, temperature rises to 650 DEG C~700 DEG C and stirs Mix 1~5min；
S3, the melt temperature obtained after step S1 processing is risen to 670 DEG C~720 DEG C 5~10min of standings heat preservation；
S4, wait stand heat preservation after, be to be obtained in 160 DEG C~240 DEG C of metal type dies by melt cast to preheating temperature Magnesium-rare earth alloy ingot casting.
6. the preparation method of high-strength temperature-resistant casting magnesium-rare earth alloy according to claim 4, which is characterized in that at the heat Reason include the following steps: will be smelting after obtained magnesium-rare earth alloy ingot casting successively carry out solution treatment and ageing treatment.
7. the preparation method of high-strength temperature-resistant casting magnesium-rare earth alloy according to claim 6, which is characterized in that the solid solution The step of processing are as follows: first in 500~540 DEG C of 4~12h of solution treatment, then in 300~350 DEG C of solution treatment 0h~10h；Two Air-cooled processing is carried out after secondary solution treatment respectively.
8. the preparation method of high-strength temperature-resistant casting magnesium-rare earth alloy according to claim 6, which is characterized in that the twin-stage The step of ageing treatment are as follows: first 50~100h of timeliness, the then timeliness 0 under the conditions of 100~170 DEG C under the conditions of 170~250 DEG C ~50h；Carry out air-cooled processing after timeliness respectively twice.
CN201811550162.7A 2018-12-18 2018-12-18 A kind of high-strength temperature-resistant casting magnesium-rare earth alloy and preparation method thereof Pending CN109468513A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109943760A (en) * 2019-05-15 2019-06-28 湖南科技大学 High-strength high-plastic magnesium-rare earth of one kind and preparation method thereof
CN111218598A (en) * 2020-02-08 2020-06-02 苏州轻金三维科技有限公司 High-strength heat-resistant light alloy for three-dimensional printing and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103074531A (en) * 2013-01-11 2013-05-01 河南科技大学 Heat resistant alloy of rare earth and magnesium and preparation method thereof
CN103820689A (en) * 2012-11-19 2014-05-28 北京有色金属研究总院 High-strength and heat-resistant magnesium alloy containing two rare earths and preparation method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103820689A (en) * 2012-11-19 2014-05-28 北京有色金属研究总院 High-strength and heat-resistant magnesium alloy containing two rare earths and preparation method thereof
CN103074531A (en) * 2013-01-11 2013-05-01 河南科技大学 Heat resistant alloy of rare earth and magnesium and preparation method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109943760A (en) * 2019-05-15 2019-06-28 湖南科技大学 High-strength high-plastic magnesium-rare earth of one kind and preparation method thereof
CN111218598A (en) * 2020-02-08 2020-06-02 苏州轻金三维科技有限公司 High-strength heat-resistant light alloy for three-dimensional printing and preparation method thereof
CN111218598B (en) * 2020-02-08 2021-04-20 苏州轻金三维科技有限公司 High-strength heat-resistant light alloy for three-dimensional printing and preparation method thereof

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Application publication date: 20190315