CN101008060A - Heat-proof magnesium-base rare earth alloy and its preparation method - Google Patents
Heat-proof magnesium-base rare earth alloy and its preparation method Download PDFInfo
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Abstract
The invention relates to thermal resistant magnesium-base rare earth alloy and the preparing method. The alloy comprises following components: Gd 6-8wt%, R 1- 5wt%, Zr 0.3-0.6wt%, mixture of Ni, Cu, Fe, Si and Al, not more than 100 wt%, and the left is Mg. The general formula is Mg-(6-8%)Gd-(1-5%)R-(0.3-0.6%)Zr, R is Nd, or Sm, or MY, or Dy or Ho, or Er; and the RE total weight in alloy is controlled between 7%- 13%. The invention is to solve problem of less varieties of available rare earth thermal resistant magnesium alloy, and to provide high- performance thermal resistant magnesium-base rare earth alloy with proper amount combination of GD and RE and the preparing method. The invention employs cheap MY to replace pure Y for alloy element, which can not only guarantee good comprehensive performance, but aslo reduce aloy cost, and gets high perfromance price ratio alloy.
Description
Technical field:
The present invention relates to a kind of heat-proof magnesium-base rare earth alloy and preparation method thereof.Particularly relating to a kind of is the heat-proof magnesium-base Alloy And Preparation Method of main alloy element to add gadolinium and another kind of rare earth.
Background technology
Magnesium-base rare earth alloy is one of performance best material in the heat resistance magnesium alloy.Particularly the alloy of high rare-earth content has excellent mechanical property 150 ℃～300 ℃ temperature ranges.But up to the present, such alloy is the main deficiency that exists aspect two in design, preparation and application process: 1. as magnesium alloy strengthening element--the research aspect of rare earth element is also not enough, can be few for the kind of actual use.2. utilize also the having great potentialities of property/price ratio of such refractory alloy of raising such as rare earth element array mode, number of combinations.Rare earth has 17 kinds of elements, and removing a kind ofly has outside the radioelement promethium, and the suitable rare earth element kind and the mode quantity of number combinations are huge; But, in the past in 30 years, at first develop the WE54 and the WE43 heat-proof magnesium-base rare earth alloy that are combined as augmented form with Rare Earth Y, Nd and mixed heavy rare earth (MRE) three, be respectively Mg-5%Y-2%MRE-2%Nd-0.4%Zr (WE54) and Mg-4%Y-3%MRE-0.4%Zr (WE43) its representative composition.The alloy of these two kinds of trades mark has good temperature resistance energy and over-all properties.In recent years find, have than WE54 and the better mechanical property of WE43 with the prepared heat-proof magnesium-base rare earth alloy that goes out of rare-earth Gd, Y array mode, the alloy of this Gd, Y array mode has representative the composition: Mg-8%Gd-3%Y-1%Mn, Mg-10%Gd-0.8%Sc-1%Mn, Mg-9%Gd-4%Y-0.6%Zr, Mg-(5%～17%) Gd-(2%～10%) Y-(0.5%～0.8%) Zr and Mg-(6%～15%) Gd-(1%～6%) Y-(0.35%-0.80%) Zr-(0～1.5%) Ca.
No. 02802647.0, No. 20040045639, United States Patent (USP) and Chinese patent, the patent that is entitled as " magnesium alloy " that the Japanese honda skill company of grinding applies for is disclosed, this disclosure of the Invention the mechanical performance data of heat resistance magnesium alloy under 200 ℃ that obtained of nearly hundred kinds of Gd and other element combinations.Proposed to pay attention to the fine thought that solution strengthening is contributed in the research heat-proof magnesium-base rare earth alloy, be not disclosed in the rare earth of using value combined result arranged more than 250 ℃ but its shortcoming is this invention.
No. 200510025251.6, another Chinese patent; disclose the patent that is entitled as " high-strength heat-resisting magnesium alloy and preparation method thereof ", this patent application protection rare earth (RE) total amount is 7%～21% Mg-(6%～15%) Gd-(1%～6%) Y-(0.35%-0.80%) Zr-(0～1.5%) Ca system.The advantage of this invention has been to obtain to have more than 250 ℃ the combined result of using value.But its shortcoming is: this is invented main and auxiliary strengthening element array mode and still is Gd, Y array mode, also do not relate to the more rare earth combination research results outside Gd, the Y combination, and this invention is difficult to find in its inventive embodiments with Mg-9%Gd-4%Y-0.6%Zr system of finding in the past or the difference of Mg-11%Gd-3%Y-0.4%Zr system on core is formed.
No. 200610031169.9, Chinese patent, the patent that is entitled as " high-strength heat-resistant rare earth magnesium alloy " was disclosed on July 19th, 2006, this patent application protection RE total amount is 5%～22% Mg-(2%～10%) Gd-(3%～12%) Y-(0.4%-0.7%) Zr-0.3%R or the system of Mg-(2%～10%) Gd-(3%～12%) Y-(0.6%～1.5%) Mn-0.3%X, and wherein R is Cu, Ca etc.; X is Sb, Sn etc.The advantage of this invention is to have obtained under 300 ℃ of application conditions, in short-term (more than 10 minutes) ultimate tensile strength σ b 〉=180MPa.Promptly can use, can be used as the well behaved alloy of wrought magnesium alloys processing again as cast magnesium alloys.But its shortcoming is: this is invented main and auxiliary strengthening element array mode and still is confined to Gd, Y array mode, does not also relate to the more rare earth combination research results outside Gd, the Y combination.
On August 9th, 2006; Chinese patent discloses the patent that is entitled as " high-strength heat-resisting magnesium alloy and preparation method thereof " again No. 200610024085.2, and this patent application protection RE total amount is the system of 5%～18% Mg-(3%～12%) Y-(2%～6%) Sm-(0.35%-0.8%) Zr.The advantage of this invention is to pay attention to new rare earth element combination, has invented with the Nd in the Sm replacement WE series alloy, has obtained the new alloy of Y-Sm combined system.But the result of study that does not relate to the Gd-Sm array mode yet.
Zhang Xinming etc. replace the Mg-9%Gd-4%Y-0.6%Zr system with the Mg-9%Gd-4%Y-0.65%Mn system.Contain the Mn heat resisting magnesium-rare earth alloy than thick many of the crystal grain that contains the Zr alloy though find as cast condition, as long as but T5 processing the becoming T6 that will contain the Mn alloy handles, result (the Zhang Xinming etc. that also can obtain, Mg-Gd-Y-(Mn, Zr) microstructure of alloy and mechanical property [J]. the China YouSe Acta Metallurgica Sinica, 16 (2), 2006, the 219-217 pages or leaves).The advantage of this discovery is to replace Zr to reduce raw materials cost and performance remains unchanged substantially with Mn.But the shortcoming of this discovery is to have ignored reduction alloy master strengthening element---rare earth element, comes bigger reduction raw materials cost thus, thereby further improves this alloy/price ratio.Because the similarity of the physical/chemical of rare earth element, the separation between the rare earth element is pure makes higherly, and the separation costs of mishmetal is lower than the single rare earth.The price of for example rich yttrium mixed rare earth (MY) is usually than pure yttrium considerably cheaper, and its major cause derives from the otherness of separation costs.In the design process of heat-proof magnesium-base rare earth alloy, under possible condition, replace single rare earth can be significantly reduced to this with mishmetal.When displaced result makes that final alloy property is more or less the same, then can improve the property/price ratio of heat-proof magnesium-base rare earth alloy, also not enough in the heat-proof magnesium-base rare earth alloy process of this design philosophy in foregoing invention.
Summary of the invention
The objective of the invention is at existing heat-proof magnesium-base rare earth alloy exist the rare earth element kind and the deficiency of number combinations, and the undesirable problem of property/price ratio, heat-proof magnesium-base rare earth alloy and preparation method thereof is provided, is specifically related to provide the high performance heat resistant magnesium-base rare earth alloy and preparation method thereof of the multiple number combinations of Gd-Nd, Gd-Sm, Gd-MY, Gd-Dy, Gd-Ho and Gd-Er.To solve the problem that industrial alternative heat-proof magnesium-base rare earth alloy kind is few and property/price ratio is undesirable and rare earth resources can not efficiently utilize.
The basic fundamental principle of heat-proof magnesium-base rare earth alloy of the present invention institute foundation is:
One, in the design aspect combination of rare earth element kind and the number combinations: 1. require in the design that the heat-proof magnesium-base rare earth alloy of good mechanical property is arranged more than 250 ℃ for heat resisting temperature, the strengthening element precipitation strength has precedence over solution strengthening and considers.2. the main strengthening element performance of the not obvious influence of assisted and strengthened element strengthening effect.
For example: for the design of the heat-proof magnesium-base rare earth alloy of Gd-Dy combination: the main strengthening element in the alloy of the present invention is a rare-earth Gd, and the addition of Gd is controlled at 6%～8%.Assisted and strengthened element is Dy, and the addition of Dy is controlled at 2%～5%.From the binary phase diagram of Mg-Gd and Mg-Dy as can be seen: 1. main strengthening element Gd separates out the intermetallic compound Mg of probability maximum process of cooling
5The fusing point of Gd is 642 ℃, and the intermetallic compound Mg that auxilliary strengthening element Dy separates out the probability maximum
24Dy
5Fusing point be 600 ℃, the two fusing point differs 42 ℃.The precipitate of main strengthening element is higher than auxilliary strengthening element to the contribution that improves the alloy use temperature.To such an extent as to if the precipitate of separating out the main strengthening element of strong interference of auxilliary strengthening element makes main strengthening element precipitate reduce improving the stable on heating contribution of alloy, then alloy designs does not meet this principle.2. it can also be seen that from binary phase diagram: at 500 ℃ in room temperature range, in rich Mg phase map-area, the solid solubility of Dy in Mg is more many greatly than the solid solubility of Gd in Mg, for example: at 500 ℃, 400 ℃, 300 ℃, 200 ℃ and 100 ℃, the maximum solid solution degree of Dy in Mg is respectively 22.4%, 18.0%, 13.9%, 10.6%, 7.1%; And under said temperature, the maximum solid solution degree of Gd in Mg then is respectively 18.1%, 10.9%, 6.2%, 3.1% and 0.9%.This shows, in the alloy process of cooling, since auxilliary strengthening element Dy at synthermal maximum solid solution degree down greater than main strengthening element Gd, and add quantity and be less than main strengthening element Gd, thereby, not separating out of Dy can be disturbed separating out of main strengthening element Gd strongly, guarantees that main strengthening element Gd has given play to bigger precipitation strength effect.For the auxiliary element Zr among the present invention: from the Mg-Zr phasor as can be seen, at 150 ℃～550 ℃, the solid solubility of Zr in Mg is very little, and the content of Zr of the present invention is controlled at 0.3%～0.6%, mainly plays crystal grain thinning.
Two, in the design that improves aspect heat-proof magnesium-base rare earth alloy/price ratio: 1. based on the principle of Gd: Gd is first component, and the addition of Gd is controlled at 6%～8%.2. rare earth element such as Nd or Sm or MY or Dy or Ho or Er is auxilliary principle: rare earth elements such as Nd or Sm or MY or Dy or Ho or Er are second component, and the addition span of control is 1%～5%.3. rare earth element such as Gd and Nd or Sm or MY or Dy or Ho or Er overall control principle: the RE overall control is 7%～13%.
For example: in the design process of the heat-proof magnesium-base rare earth alloy that substitutes Y manufacturing Gd-MY array mode with MY, selecting Gd is main strengthening element.Because in the time of 200 ℃, the solid solubility of Gd in Mg is about 3.1%, and solution strengthening itself has bigger contribution for the resistance toheat of alloy; When the addition of Gd is controlled at 6%～8%, surpasses 3.1% part and form Mg easily
5The Gd compound utilizes precipitation strength to improve the resistance toheat of alloy.The adding of assisted and strengthened element M Y can reduce the solid solubility of Gd in Mg, thereby improves the precipitating reinforcing effect of main strengthening element Gd.The RE overall control is 7%～11% in the alloy, and it is identical with the RE total amount of WE43 that it measures little value, and its maximum value is 9% WE54 system greater than the RE total amount, is 13% Mg-9%Gd-4%Y-0.6%Zr system less than the RE total amount.In addition, in past 20 years, the result of study of many countries in research Al-Zr-Y alumite conductor wire and Fe-Cr-Al-Y high temperature steel process shows: replace pure Y with MY, both guaranteed that alloy had excellent comprehensive performances, also reduced the cost of alloy, and these aluminium alloy and high temperature steel with MY instead of pure Y all develop into affixed merchandise to today; So the design is transplanted to design heat resistance magnesium alloy field with the thought of " MY replaces pure Y " from aluminium alloy and field of alloy steel, the heat-proof magnesium-base rare earth alloy that obtains high property/price ratio has feasibility and feasibility.
Heat-proof magnesium-base rare earth alloy of the present invention, it forms general formula: Mg-(6～8%) Gd-(1～5%) Re-(0.3～0.7%) Zr, concrete composition and quality proportioning are: 6～8%Gd, 1～5%Re, 0.3～0.7%Zr, the total amount of impurity element Ni, Cu, Fe and Si is not more than 0.05%, and all the other are Mg.Re represents Nd, Sm, MY, Dy, Ho or Er; Gd in this heat-proof magnesium-base rare earth alloy and Re percentage composition sum are the RE total amount, and its scope is 7%-13%.
The preparation method's of heat-proof magnesium-base rare earth alloy of the present invention step and condition are as follows:
With commercially available purity is 99.9% Mg ingot, 99.5% Mg-RE intermediate alloy ingot: Mg-Gd, Mg-Nd, Mg-Sm, Mg-MY, Mg-Dy, Mg-Ho, Mg-Er intermediate alloy ingot, and 99.5% Mg-Zr intermediate alloy ingot is an alloy raw material; It is 20～30% that RE in the Mg-RE intermediate alloy ingot accounts for weight alloy per-cent; The relative composition of rich yttrium mixed rare earth MY in the Mg-MY intermediate alloy ingot, that is: each single rare earth accounts for the weight percent of rich yttrium mixed rare earth total amount and is: Y is 88.2%, Er is 6.9%, Ho is 1.4%, Yb is 1.2%, rare earth summations such as other La, Ce, Pr are 2.3%, and all single rare earth summations are 100% among the MY.It is 30% that Zr content in the Mg-Zr intermediate alloy ingot accounts for the master alloy weight percent.
Mg ingot and intermediate alloy ingot raw material are through cutting, oil removing, drying and scale removal; Wherein, oil removing is that Mg ingot and intermediate alloy ingot raw material soaking are scrubbed in the alkali lye that contains tensio-active agent, washes with clean water then; Dry is seasoning; The method that descales is the mechanical removal method with file or plane.
Carry out raw materials weighing according to the quality proportioning, raw material is dipped in molten salt pool join smelting temperature T after hanging fused salt
fBe in 650 ℃-790 ℃ the smelting furnace, institute dips in and hangs fused salt is alkali-metal halogen, wherein the villaumite of preferred as alkali; More preferably contain the villaumite system that weight percent is respectively the basic metal villiaumite below 5%, most preferably containing weight percent is the fused salt mixt system of the NaCl-KCl of 2%NaF additive.
Order of addition(of ingredients) in smelting furnace is: metal M g, Mg-Gd master alloy, Mg-Nd or Mg-Sm or Mg-MY or Mg-Dy or Mg-Ho or Mg-Er master alloy, Mg-Zr master alloy.The crucible of this smelting furnace is a plumbago crucible.Protective material is a molten chloride, preferred as alkali muriate binary or ternary mixing salt, and more preferably containing weight percent is the fused salt mixt system of the NaCl-KCl of 2%NaF additive.
Begin to stir and add each churning time t until all raw materials from adding second kind of raw material Mg-Gd master alloy
sBe 2～10min.Should leave standstill time of repose t before the alloy cast
pBe 10～30min, casting metal mold preheating temperature T
wBe 200～250 ℃, teeming temperature T
pIt is 670～730 ℃.Alloy liquid is poured into a mould in the metal die of preheating after skimming.Then the alloy that obtains is heat-treated, thermal treatment is divided into solid solution and artificial aging is handled two portions.The solution treatment condition is: at 530 ℃ of insulation 8～12h, the sample after the solution treatment is at T
WgScope is shrend in 45～85 ℃ the water; The artificial aging treatment condition are: aging temp T
AtBe 200～250 ℃, aging time t
AtBe 40～100h, obtain heat-proof magnesium-base rare earth alloy.
Preparation method's advantage of the present invention:
1, the multiple heat-proof magnesium-base rare earth alloy of Gd-Nd of the present invention, Gd-Sm, Gd-MY, Gd-Dy, Gd-Ho and Gd-Er array mode has increased the heat-proof magnesium-base rare earth alloy kind of industrial available application.
2, adopt cheap MY to replace pure Y, both guaranteed that alloy had excellent comprehensive performances, also reduced cost of alloy simultaneously, obtain the heat-proof magnesium-base rare earth alloy of high property/price ratio as alloy element.
Description of drawings
Fig. 1 is the typical XRD figure of the heat-proof magnesium-base rare earth alloy of Gd-Nd combination of the present invention.
Fig. 2 is the typical organization of the heat-proof magnesium-base rare earth alloy of Gd-Nd combination of the present invention.
Fig. 3 is the typical XRD figure of the heat-proof magnesium-base rare earth alloy of Gd-Sm combination of the present invention.
Fig. 4 is the typical organization of the heat-proof magnesium-base rare earth alloy of Gd-Sm combination of the present invention.
Fig. 5 is the typical XRD figure of the heat-proof magnesium-base rare earth alloy of Gd-MY combination of the present invention.
Fig. 6 is the typical organization of the heat-proof magnesium-base rare earth alloy of Gd-MY combination of the present invention.
Fig. 7 is the typical XRD figure of the heat-proof magnesium-base rare earth alloy of Gd-Dy combination of the present invention.
Fig. 8 is the typical organization of the heat-proof magnesium-base rare earth alloy heat of Gd-Dy combination of the present invention.
Fig. 9 is the typical XRD figure of the new heat-proof magnesium-base rare earth alloy of Gd-Ho combination of the present invention.
Figure 10 is the typical organization of the heat-proof magnesium-base rare earth alloy of Gd-Ho combination of the present invention.
Figure 11 is the typical XRD figure of the heat-proof magnesium-base rare earth alloy of Gd-Er combination of the present invention.
Figure 12 is the typical organization of the heat-proof magnesium-base rare earth alloy of Gd-Er combination of the present invention.
Embodiment:
Embodiment 1:
Composition according to Mg-6%Gd-3%Dy-0.5%Zr carries out proportioning raw materials, and per-cent wherein is weight percentage, and Mg is a surplus.Used raw material is that commercially available purity is 99.9% Mg ingot in this formula, 99.5% Mg-20%Gd and Mg-25%Dy intermediate alloy ingot, 99.5% Mg-30%Zr intermediate alloy ingot.Ingot metal and alloy pig are behind cutting, oil removing, drying and scale removal, and wherein oil removing means mainly are that metal and alloy raw material are dipped into the clean water flushing of scrubbing in the alkali lye that contains tensio-active agent with then; Dry is seasoning; The method that descales is the mechanical removal method of file or plane.
Carry out counterweight according to designed content.Metal block after the counterweight and alloy block join smelting temperature T after dipping in and hanging fused salt in molten salt pool
fBe that the addition sequence of raw material is followed successively by: metal M g, Mg-20%Gd, Mg-25%Dy and Mg-30%Zr master alloy in 780 ℃ the smelting furnace;
The crucible of this smelting furnace is a plumbago crucible.Protective material is a molten chloride, wherein preferably alkali metal chloride binary or ternary mixing salt, and more preferably containing weight percent is the fused salt mixt system of the NaCl-KCl of 2%NaF additive.
Begin to stir till all raw materials add from adding second kind of raw material.Each churning time t
sBe 5min.Alloy t rest time before the cast
pBe 20min, mold preheating temperature T
wBe 220 ℃, teeming temperature T
pIt is 730 ℃.Divide two portions with the alloy that obtains, a part is as as-cast structure and performance measurement, and another part is heat-treated.Solution treatment condition wherein is in 530 ℃ of insulation 8h, cold quenching temperature T
WgFor in 60 ℃ water; Artificial aging treatment temp T
AtBe 250 ℃, aging time t
AtBe 80h.
Mg-6%Gd-3%Dy-0.5%Zr heat resistance magnesium alloy as cast condition mechanical property of the present invention is:
Room temperature: tensile strength: 212MPa; Yield strength: 133MPa; Elongation: 8.1%.
250 ℃: tensile strength: 189MPa; Yield strength: 117MPa; Elongation: 11.7%.
Mechanical property is after the Mg-6%Gd-3%Dy-0.5%Zr heat resistance magnesium alloy of the present invention thermal treatment:
Room temperature: tensile strength: 359MPa; Yield strength: 260MPa; Elongation: 7.1%.
250 ℃: tensile strength: 291MPa; Yield strength: 210MPa; Elongation: 10.1%.
Embodiment 2:
All the other are with embodiment 1.Heat resistance magnesium alloy consists of Mg-8%Gd-1%Dy-0.5%Zr.Its preparation technology parameter is: T
fBe 650 ℃, ts is 2min, t
pBe 10min, T
wBe 200 ℃, T
pBe 670 ℃, T
WgBe 60 ℃, T
AtBe 200 ℃, t
AtBe 50h.
The mechanical property of Mg-8%Gd-1%Dy-0.5%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 202MPa; Yield strength: 113MPa; Elongation: 7.8%.
250 ℃: tensile strength: 179MPa; Yield strength: 107MPa; Elongation: 11%.
Mechanical property after the Mg-8%Gd-1%Dy-0.5%Zr heat resistance magnesium alloy of the present invention thermal treatment is:
Room temperature: tensile strength: 367MPa; Yield strength: 270MPa; Elongation: 6.7%.
250 ℃: tensile strength: 290MPa; Yield strength: 215MPa; Elongation: 8.9%.
Embodiment 3:
All the other are with embodiment 1.Heat resistance magnesium alloy consist of Mg-7%Gd-5%Dy-0.4%Zr.Its preparation technology parameter is: T
fBe 715 ℃, ts is 6min, t
pBe 15min, T
wBe 210 ℃, T
pBe 690 ℃, T
WgBe 60 ℃, T
AtBe 230 ℃, t
AtBe 72h.
The mechanical property of Mg-7%Gd-5%Dy-0.4%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 242MPa; Yield strength: 123MPa; Elongation: 7.1%.
250 ℃: tensile strength: 199MPa; Yield strength: 128MPa; Elongation: 9.4%.
Mechanical property after the Mg-7%Gd-5%Dy-0.4%Zr heat resistance magnesium alloy of the present invention thermal treatment is:
Room temperature: tensile strength: 379MPa; Yield strength: 275MPa; Elongation: 7.7%.
250 ℃: tensile strength: 298MPa; Yield strength: 235MPa; Elongation: 9.8%.
Embodiment 4:
All the other are with embodiment 1.Heat resistance magnesium alloy consist of Mg-6%Gd-3%Dy-0.3%Zr.Its preparation technology parameter is: T
fBe 740 ℃, ts is 8min, t
pBe 18min, T
wBe 215 ℃, T
pBe 700 ℃, T
WgBe 60 ℃, T
AtBe 240 ℃, t
AtBe 60h.
Mg-6%Gd-3%Dy-0.3%Zr of the present invention.The mechanical property of heat resistance magnesium alloy as cast condition is:
Room temperature: tensile strength: 212MPa; Yield strength: 113MPa; Elongation: 8.7%.
250 ℃: tensile strength: 189MPa; Yield strength: 108MPa; Elongation: 9.4%.
Mechanical property after the Mg-6%Gd-3%Dy-0.3%Zr heat resistance magnesium alloy of the present invention thermal treatment is:
Room temperature: tensile strength: 349MPa; Yield strength: 255MPa; Elongation: 8.0%.
250 ℃: tensile strength: 258MPa; Yield strength: 215MPa; Elongation: 9.3%.
Embodiment 5:
All the other are with embodiment 1.Carry out proportioning raw materials according to consisting of Mg-6%Gd-3%MY-0.4%Zr, used MY raw material is that commercially available purity is 99.5% Mg-25%MY intermediate alloy ingot in this formula.In MY, the weight percent that each single rare earth accounts for the mishmetal total amount is respectively: Y=88.2%, Er=6.9%, Ho=1.4%, Yb=1.2%, other rare earth summation=1.8%.Its preparation technology parameter is: T
fBe 790 ℃, ts is 15min, t
pBe 30min, T
wBe 220 ℃, T
pBe 730 ℃, T
WgBe 75 ℃, T
AtBe 250 ℃, t
AtBe 100h.
The mechanical property of Mg-6%Gd-3%MY-0.4%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 199MPa; Yield strength: 137MPa; Elongation: 7.5%.
250 ℃: tensile strength: 174MPa; Yield strength: 105MPa; Elongation: 12.4%.
Mechanical property after the heat resistance magnesium alloy Mg-6%Gd-3%MY-0.4%Zr thermal treatment is:
Room temperature: tensile strength: 279MPa; Yield strength: 182MPa; Elongation: 5.5%.
250 ℃: tensile strength: 237MPa; Yield strength: 156MPa; Elongation: 9.4%.
Embodiment 6:
All the other are with embodiment 5.Heat resistance magnesium alloy consist of Mg-8%Gd-1%MY-0.6%Zr.Its preparation technology parameter is: T
fBe 660 ℃, t
sBe 5min, t
pBe 20min, T
wBe 200 ℃, T
pBe 670 ℃, T
WgBe 75 ℃, T
AtBe 200 ℃, t
AtBe 60h.
The mechanical property of Mg-8%Gd-1%MY-0.6%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 201MPa; Yield strength: 139MPa; Elongation: 7.6%.
250 ℃: tensile strength: 176MPa; Yield strength: 107MPa; Elongation: 12.6%.
Mechanical property after the heat resistance magnesium alloy Mg-8%Gd-1%MY-0.6%Zr thermal treatment is:
Room temperature: tensile strength: 281MPa; Yield strength: 184MPa; Elongation: 5.6%.
250 ℃: tensile strength: 239MPa; Yield strength: 158MPa; Elongation: 9.5%.
Embodiment 7:
All the other are with embodiment 5.Heat resistance magnesium alloy consist of Mg-7%Gd-3%MY-0.4%Zr.Its preparation technology parameter is: T
fBe 720 ℃, t
sBe 10min, t
pBe 25min, T
wBe 210 ℃, T
pBe 700 ℃, T
WgBe 75 ℃, T
AtBe 235 ℃, t
AtBe 90h.
The mechanical property of Mg-7%Gd-3%MY-0.4%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 202MPa; Yield strength: 140MPa; Elongation: 7.7%.
250 ℃: tensile strength: 177MPa; Yield strength: 108MPa; Elongation: 12.7%.
Mechanical property after the heat resistance magnesium alloy Mg-7%Gd-3%MY-0.4%Zr thermal treatment is:
Room temperature: tensile strength: 282MPa; Yield strength: 185MPa; Elongation: 5.4%.
250 ℃: tensile strength: 240MPa; Yield strength: 159MPa; Elongation: 9.6%.
Embodiment 8:
All the other are with embodiment 1.Heat resistance magnesium alloy consist of Mg-8%Gd-3%MY-0.5%Zr.Its preparation technology parameter is: T
fBe 720 ℃, t
sBe 10min, t
pBe 25min, T
wBe 215 ℃, T
pBe 710 ℃, T
WgBe 75 ℃, T
AtBe 225 ℃, t
AtBe 80h.
The mechanical property of Mg-8%Gd-3%MY-0.5%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 205MPa; Yield strength: 143MPa; Elongation: 8.0%.
250 ℃: tensile strength: 180MPa; Yield strength: 111MPa; Elongation: 13.0%.
Mechanical property after the heat resistance magnesium alloy Mg-8%Gd-3%MY-0.5%Zr thermal treatment is:
Room temperature: tensile strength: 286MPa; Yield strength: 189MPa; Elongation: 6.0%.
250 ℃: tensile strength: 243MPa; Yield strength: 162MPa; Elongation: 9.9%.
Embodiment 9:
All the other are with embodiment 1.Heat resistance magnesium alloy consist of Mg-6%Gd-3%Nd-0.5%Zr, used Nd raw material is that commercially available purity is 99.5% Mg-22%Nd intermediate alloy ingot in this skeleton symbol.Its preparation technology parameter is: T
fBe 720 ℃, t
sBe 10min, t
pBe 25min, T
wBe 215 ℃, T
pBe 710 ℃, T
WgBe 65 ℃, T
AtBe 225 ℃, t
AtBe 40h.
The mechanical property of Mg-6%Gd-3%Nd-0.5%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 184MPa; Yield strength: 107MPa; Elongation: 5.0%.
250 ℃: tensile strength: 140MPa; Yield strength: 96MPa; Elongation: 7.0%.
Mechanical property after the heat resistance magnesium alloy Mg-6%Gd-3%Nd-0.5%Zr thermal treatment is:
Room temperature: tensile strength: 236MPa; Yield strength: 189MPa; Elongation: 4.0%.
250 ℃: tensile strength: 183MPa; Yield strength: 132MPa; Elongation: 5.9%.
Embodiment 10:
All the other are with embodiment 9.Heat resistance magnesium alloy consist of Mg-8%Gd-3%Nd-0.4%Zr, its preparation technology parameter is: T
fBe 720 ℃, t
sBe 10min, t
pBe 25min, T
wBe 210 ℃, T
pBe 700 ℃, T
WgBe 65 ℃, T
AtBe 235 ℃, t
AtBe 40h.
The mechanical property of Mg-8%Gd-3%Nd-0.4%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 232MPa; Yield strength: 160MPa; Elongation: 5.7%.
250 ℃: tensile strength: 174MPa; Yield strength: 128MPa; Elongation: 10.7%.
Mechanical property after the heat resistance magnesium alloy Mg-8%Gd-3%Nd-0.4%Zr thermal treatment is:
Room temperature: tensile strength: 285MPa; Yield strength: 195MPa; Elongation: 4.7%.
250 ℃: tensile strength: 230MPa; Yield strength: 160MPa; Elongation: 8.6%.
Embodiment 11:
All the other are with embodiment 9.Heat resistance magnesium alloy consist of Mg-7%Gd-1%Nd-0.6%Zr.Its preparation technology parameter is: T
fBe 720 ℃, t
sBe 10min, t
pBe 25min, T
wBe 210 ℃, T
pBe 700 ℃, T
WgBe 65 ℃, T
AtBe 235 ℃, t
AtBe 50h.
The mechanical property of Mg-7%Gd-1%Nd-0.6%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 192MPa; Yield strength: 137MPa; Elongation: 6.7%.
250 ℃: tensile strength: 157MPa; Yield strength: 98MPa; Elongation: 8.7%.
Mechanical property after the heat resistance magnesium alloy Mg-7%Gd-1%Nd-0.6%Zr thermal treatment is:
Room temperature: tensile strength: 262MPa; Yield strength: 165MPa; Elongation: 5.4%.
250 ℃: tensile strength: 200MPa; Yield strength: 149MPa; Elongation: 7.6%.
Embodiment 12:
All the other are with embodiment 9.Heat resistance magnesium alloy consist of Mg-7%Gd-2%Nd-0.5%Zr.Its preparation technology parameter is: T
fBe 720 ℃, t
sBe 6min, t
pBe 15min, T
wBe 210 ℃, T
pBe 690 ℃, T
WgBe 65 ℃, T
AtBe 230 ℃, t
AtBe 68h.
The mechanical property of Mg-7%Gd-2%Nd-0.5%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 244MPa; Yield strength: 153MPa; Elongation: 6.1%.
250 ℃: tensile strength: 189MPa; Yield strength: 128MPa; Elongation: 7.8%.
Mechanical property after the Mg-7%Gd-2%Nd-0.5%Zr heat resistance magnesium alloy of the present invention thermal treatment is:
Room temperature: tensile strength: 309MPa; Yield strength: 255MPa; Elongation: 5.9%.
250 ℃: tensile strength: 248MPa; Yield strength: 195MPa; Elongation: 6.3%.
Embodiment 13:
All the other are with embodiment 1.Heat resistance magnesium alloy consist of Mg-6%Gd-5%Sm-0.4%Zr, used Sm raw material is that commercially available purity is 99.5% Mg-20%Sm intermediate alloy ingot in this formula.Its preparation technology parameter is: T
fBe 740 ℃, t
sBe 8min, t
pBe 18min, T
wBe 215 ℃, T
pBe 700 ℃, T
WgBe 60 ℃, T
AtBe 240 ℃, t
AtBe 62h.
The mechanical property of Mg-6%Gd-5%Sm-0.4%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 202MPa; Yield strength: 103MPa; Elongation: 8.7%.
250 ℃: tensile strength: 169MPa; Yield strength: 88MPa; Elongation: 9.4%.
Mechanical property after the Mg-6%Gd-5%Sm-0.4%Zr heat resistance magnesium alloy of the present invention thermal treatment is:
Room temperature: tensile strength: 269MPa; Yield strength: 175MPa; Elongation: 7.0%.
250 ℃: tensile strength: 188MPa; Yield strength: 105MPa; Elongation: 9.8%.
Embodiment 14:
All the other are with embodiment 13.Heat resistance magnesium alloy consist of Mg-8%Gd-1%Sm-0.6%Zr.Its preparation technology parameter is: T
fBe 660 ℃, t
sBe 5min, t
pBe 20min, T
wBe 200 ℃, T
pBe 670 ℃, T
WgBe 60 ℃, T
AtBe 200 ℃, t
AtBe 60h.
The mechanical property of Mg-8%Gd-1%Sm-0.6%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 211MPa; Yield strength: 138MPa; Elongation: 7.6%.
250 ℃: tensile strength: 177MPa; Yield strength: 105MPa; Elongation: 11.6%.
Mechanical property after the Mg-8%Gd-1%Sm-0.6%Zr thermal treatment of the present invention is:
Room temperature: tensile strength: 271MPa; Yield strength: 194MPa; Elongation: 4.6%.
250 ℃: tensile strength: 199MPa; Yield strength: 158MPa; Elongation: 6.5%.
Embodiment 15:
All the other are with embodiment 13.Heat resistance magnesium alloy consist of Mg-7%Gd-3%Sm-0.6%Zr.Its preparation technology parameter is: T
fBe 720 ℃, t
sBe 10min, t
pBe 25min, T
wBe 210 ℃, T
pBe 700 ℃, T
WgBe 60 ℃, T
AtBe 235 ℃, t
AtBe 70h.
The mechanical property of Mg-7%Gd-3%Sm-0.6%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 232MPa; Yield strength: 170MPa; Elongation: 5.7%.
250 ℃: tensile strength: 187MPa; Yield strength: 138MPa; Elongation: 7.7%.
Mechanical property after the Mg-7%Gd-3%Sm-0.6%Zr thermal treatment of the present invention is:
Room temperature: tensile strength: 282MPa; Yield strength: 186MPa; Elongation: 3.7%.
250 ℃: tensile strength: 210MPa; Yield strength: 169MPa; Elongation: 5.6%.
Embodiment 16:
All the other are with embodiment 13.Heat resistance magnesium alloy consist of Mg-8%Gd-2%Sm-0.5%Zr.Its preparation technology parameter is: T
fBe 720 ℃, t
sBe 10min, t
pBe 25min, T
wBe 210 ℃, T
pBe 700 ℃, T
WgBe 60 ℃, T
AtBe 235 ℃, t
AtBe 45h.
The mechanical property of Mg-8%Gd-2%Sm-0.5%Zr heat resistance magnesium alloy as cast condition of the present invention is: room temperature: tensile strength: 242MPa; Yield strength: 170MPa; Elongation: 5.2%.250 ℃: tensile strength: 194MPa; Yield strength: 138MPa; Elongation: 8.4%.
Mechanical property after the Mg-8%Gd-2%Sm-0.5%Zr thermal treatment of the present invention is:
Room temperature: tensile strength: 288MPa; Yield strength: 197MPa; Elongation: 4.9%.
250 ℃: tensile strength: 230MPa; Yield strength: 170MPa; Elongation: 5.6%.
Embodiment 17:
All the other are with embodiment 1.Heat resistance magnesium alloy consist of Mg-6%Gd-3%Ho-0.3%Zr, used Ho raw material is that commercially available purity is 99.5% Mg-30%Ho intermediate alloy ingot in this formula.Its preparation technology parameter is: T
fBe 730 ℃, t
sBe 15min, t
pBe 24min, T
wBe 218 ℃, T
pBe 710 ℃, T
WgBe 70 ℃, T
AtBe 225 ℃, t
AtBe 45h.
The mechanical property of Mg-6%Gd-3%Ho-0.3%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 191MPa; Yield strength: 117MPa; Elongation: 5.3%.
250 ℃: tensile strength: 137MPa; Yield strength: 96MPa; Elongation: 7.0%.
Mechanical property after the heat resistance magnesium alloy Mg-6%Gd-3%Ho-0.3%Zr thermal treatment is:
Room temperature: tensile strength: 238MPa; Yield strength: 179MPa; Elongation: 4.8%.
250 ℃: tensile strength: 182MPa; Yield strength: 133MPa; Elongation: 5.9%.
Embodiment 18:
All the other are with embodiment 9.Heat resistance magnesium alloy consist of Mg-8%Gd-3%Ho-0.4%Zr.Its preparation technology parameter is: T
fBe 720 ℃, t
sBe 10min, t
pBe 25min, T
wBe 210 ℃, T
pBe 700 ℃, T
WgBe 70 ℃, T
AtBe 235 ℃, t
AtBe 45h.
The mechanical property of Mg-8%Gd-3%Ho-0.4%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 235MPa; Yield strength: 164MPa; Elongation: 5.4%.
250 ℃: tensile strength: 182MPa; Yield strength: 118MPa; Elongation: 10.1%.
Mechanical property after the heat resistance magnesium alloy Mg-8%Gd-3%Ho-0.4%Zr thermal treatment is:
Room temperature: tensile strength: 289MPa; Yield strength: 194MPa; Elongation: 4.9%.
250 ℃: tensile strength: 233MPa; Yield strength: 167MPa; Elongation: 8.4%.
Embodiment 19:
All the other are with embodiment 9.Heat resistance magnesium alloy consist of Mg-7%Gd-1%Ho-0.6%Zr.Its preparation technology parameter is: T
fBe 720 ℃, t
sBe 10min, t
pBe 25min, T
wBe 210 ℃, T
pBe 700 ℃, T
WgBe 60 ℃, T
AtBe 230 ℃, t
AtBe 50h.
The mechanical property of Mg-7%Gd-1%Ho-0.6%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 182MPa; Yield strength: 127MPa; Elongation: 6.7%.
250 ℃: tensile strength: 167MPa; Yield strength: 99MPa; Elongation: 8.7%.
Mechanical property after the heat resistance magnesium alloy Mg-7%Gd-1%Ho-0.6%Zr thermal treatment is:
Room temperature: tensile strength: 264MPa; Yield strength: 161MPa; Elongation: 5.4%.
250 ℃: tensile strength: 208MPa; Yield strength: 146MPa; Elongation: 7.6%.
Embodiment 20:
All the other are with embodiment 9.Heat resistance magnesium alloy consist of Mg-7%Gd-5%Ho-0.5%Zr.Its preparation technology parameter is: T
fBe 720 ℃, t
sBe 6min, t
pBe 15min, T
wBe 210 ℃, T
pBe 690 ℃, T
WgBe 60 ℃, T
AtBe 230 ℃, t
AtBe 70h.
The mechanical property of Mg-7%Gd-5%Ho-0.5%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 245MPa; Yield strength: 155MPa; Elongation: 6.1%.
250 ℃: tensile strength: 187MPa; Yield strength: 118MPa; Elongation: 7.8%.
Mechanical property after the Mg-7%Gd-5%Ho-0.5%Zr heat resistance magnesium alloy of the present invention thermal treatment is:
Room temperature: tensile strength: 316MPa; Yield strength: 265MPa; Elongation: 5.9%.
250 ℃: tensile strength: 252MPa; Yield strength: 187MPa; Elongation: 6.3%.
Embodiment 21:
All the other are with embodiment 1.Heat resistance magnesium alloy consist of Mg-6%Gd-3%Er-0.6%Zr.Used Nd raw material is that commercially available purity is 99.5% Mg-25Er intermediate alloy ingot in this formula.Its preparation technology parameter is: T
fBe 710 ℃, t
sBe 20min, t
pBe 20min, T
wBe 215 ℃, T
pBe 710 ℃, T
WgBe 60 ℃, T
AtBe 225 ℃, t
AtBe 50h.
The mechanical property of Mg-6%Gd-3%Er-0.6%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 185MPa; Yield strength: 103MPa; Elongation: 5.0%.
250 ℃: tensile strength: 144MPa; Yield strength: 99MPa; Elongation: 7.7%.
Mechanical property after the heat resistance magnesium alloy Mg-6%Gd-3%Er-0.6%Zr thermal treatment is:
Room temperature: tensile strength: 232MPa; Yield strength: 182MPa; Elongation: 4.3%.
250 ℃: tensile strength: 173MPa; Yield strength: 130MPa; Elongation: 5.6%.
Embodiment 22:
All the other are with embodiment 9.Heat resistance magnesium alloy consist of Mg-8%Gd-3%Er-0.4%Zr.Its preparation technology parameter is: T
fBe 720 ℃, t
sBe 10min, t
pBe 25min, T
wBe 210 ℃, T
pBe 700 ℃, T
WgBe 60 ℃, T
AtBe 235 ℃, t
AtBe 45h.
The mechanical property of Mg-8%Gd-3%Er-0.4%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 212MPa; Yield strength: 160MPa; Elongation: 5.7%.
250 ℃: tensile strength: 164MPa; Yield strength: 128MPa; Elongation: 10.7%.
Mechanical property after the heat resistance magnesium alloy Mg-8%Gd-3%Er-0.4%Zr thermal treatment is:
Room temperature: tensile strength: 275MPa; Yield strength: 156MPa; Elongation: 4.7%.
250 ℃: tensile strength: 220MPa; Yield strength: 123MPa; Elongation: 8.6%.
Embodiment 23:
All the other are with embodiment 9.Heat resistance magnesium alloy consist of Mg-7%Gd-1%Er-0.6%Zr.Its preparation technology parameter is: T
fBe 720 ℃, t
sBe 10min, t
pBe 25min, T
wBe 210 ℃, T
pBe 700 ℃, T
WgBe 60 ℃, T
AtBe 235 ℃, t
AtBe 40h.
The mechanical property of Mg-7%Gd-1%Er-0.6%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 172MPa; Yield strength: 127MPa; Elongation: 6.4%.
250 ℃: tensile strength: 147MPa; Yield strength: 93MPa; Elongation: 8.7%.
Mechanical property after the heat resistance magnesium alloy Mg-7%Gd-1%Er-0.6%Zr thermal treatment is:
Room temperature: tensile strength: 242MPa; Yield strength: 165MPa; Elongation: 5.4%.
250 ℃: tensile strength: 170MPa; Yield strength: 149MPa; Elongation: 7.6%.
Embodiment 24:
All the other are with embodiment 9.Heat resistance magnesium alloy consist of Mg-7%Gd-2%Er-0.5%Zr.Its preparation technology parameter is: T
fBe 720 ℃, t
sBe 6min, t
pBe 20min, T
wBe 220 ℃, T
pBe 690 ℃, T
WgBe 60 ℃, T
AtBe 220 ℃, t
AtBe 68h.
The mechanical property of Mg-7%Gd-2%Er-0.5%Zr heat resistance magnesium alloy as cast condition of the present invention is:
Room temperature: tensile strength: 234MPa; Yield strength: 153MPa; Elongation: 6.1%.
250 ℃: tensile strength: 169MPa; Yield strength: 128MPa; Elongation: 7.8%.
Mechanical property after the MMg-7%Gd-2%Er-0.5%Zr heat resistance magnesium alloy of the present invention thermal treatment is:
Room temperature: tensile strength: 259MPa; Yield strength: 175MPa; Elongation: 5.9%.
250 ℃: tensile strength: 208MPa; Yield strength: 135MPa; Elongation: 6.3%.
Claims (5)
1, a kind of heat-proof magnesium-base rare earth alloy, it is characterized in that, it forms general formula: Mg-(6～8%) Gd-(1～5%) Re-(0.3～0.7%) Zr, its composition and mass percent proportioning are: 6～8%Gd, 1～5%Re, 0.3～0.7%Zr, the total amount of impurity element Ni, Cu, Fe and Si is not more than 0.05%, and all the other are Mg; Re represents Nd, Sm, MY, Dy, Ho or Er.
2, the preparation method of a kind of heat-proof magnesium-base rare earth alloy as claimed in claim 1 is characterized in that, step and condition are as follows:
With commercially available purity is 99.9% Mg ingot, 99.5% Mg-RE intermediate alloy ingot: Mg-Gd, Mg-Nd, Mg-Sm, Mg-MY, Mg-Dy, Mg-Ho, Mg-Er intermediate alloy ingot, and 99.5% Mg-Zr intermediate alloy ingot is an alloy raw material; It is 20～30% that RE in the Mg-RE intermediate alloy ingot accounts for weight alloy per-cent; The relative composition of rich yttrium mixed rare earth MY in the Mg-MY intermediate alloy ingot, that is: each single rare earth accounts for the weight percent of rich yttrium mixed rare earth total amount and is: Y is 88.2%, Er is 6.9%, Ho is 1.4%, Yb is 1.2%, rare earth summations such as other La, Ce, Pr are 2.3%, and all single rare earth summations are 100% among the MY; It is 30% that Zr content in the Mg-Zr intermediate alloy ingot accounts for the master alloy weight percent;
Mg ingot and intermediate alloy ingot raw material are through cutting, oil removing, drying and scale removal; Wherein, oil removing is that Mg ingot and intermediate alloy ingot raw material soaking are scrubbed in the alkali lye that contains tensio-active agent, washes with clean water then; Dry is seasoning; The method that descales is the mechanical removal method with file or plane;
Carry out raw materials weighing according to the quality proportioning, raw material is dipped in molten salt pool join smelting temperature T after hanging fused salt
fBe in 650 ℃-790 ℃ the smelting furnace, institute dips in and hangs fused salt is alkali-metal halogen;
Order of addition(of ingredients) in smelting furnace is: metal M g, Mg-Gd master alloy, Mg-Nd or Mg-Sm or Mg-MY or Mg-Dy or Mg-Ho or Mg-Er master alloy, Mg-Zr master alloy; The crucible of this smelting furnace is a plumbago crucible; Protective material is a molten chloride;
Begin to stir and add each churning time t until all raw materials from adding second kind of raw material Mg-Gd master alloy
sBe 2～10min; Should leave standstill time of repose t before the alloy cast
pBe 10～30min, casting metal mold preheating temperature T
wBe 200～250 ℃, teeming temperature T
pIt is 670～730 ℃; Alloy liquid is poured into a mould in the metal die of preheating after skimming; Then the alloy that obtains is heat-treated, thermal treatment is divided into solid solution and artificial aging is handled two portions; The solution treatment condition is: at 530 ℃ of insulation 8～12h, the sample after the solution treatment is at T
WgScope is shrend in 45～85 ℃ the water; The artificial aging treatment condition are: aging temp T
AtBe 200～250 ℃, aging time t
AtBe 40～100h, obtain heat-proof magnesium-base rare earth alloy.
3, the preparation method of a kind of heat-proof magnesium-base rare earth alloy as claimed in claim 2 is characterized in that, the described villaumite that dips in the halogen preferred as alkali of hanging fused salt; Protective material preferred as alkali muriate binary or ternary mixing salt.
4, the preparation method of a kind of heat-proof magnesium-base rare earth alloy as claimed in claim 3; it is characterized in that; the described alkali-metal villaumite of hanging fused salt that dips in more preferably contains the villaumite system that weight percent is the basic metal villiaumite below 5%, and protective material preferably more preferably contains the fused salt mixt that weight percent is the NaCl-KCl of 2% NaF additive.
5, the preparation method of a kind of heat-proof magnesium-base rare earth alloy as claimed in claim 4 is characterized in that, described dipping in hung fused salt and protective material and most preferably be and contain the fused salt mixt system that weight percent is the NaCl-KCl of 2% NaF additive.
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