CN103305738B - Siliceous heat resisting magnesium-rare earth alloy and preparation method thereof - Google Patents

Siliceous heat resisting magnesium-rare earth alloy and preparation method thereof Download PDF

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CN103305738B
CN103305738B CN201310257384.0A CN201310257384A CN103305738B CN 103305738 B CN103305738 B CN 103305738B CN 201310257384 A CN201310257384 A CN 201310257384A CN 103305738 B CN103305738 B CN 103305738B
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magnesium
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rare earth
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CN103305738A (en
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汪欢
王渠东
杨俊�
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Shanghai Jiaotong University
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Abstract

The invention discloses a kind of siliceous heat resisting magnesium-rare earth alloy and preparation method thereof; Described alloy comprises each component of following weight percent: Gd5 ~ 10%, Y2 ~ 8%, Si0.3 ~ 2%, Zr0.35 ~ 0.8%, Gd+Y11 ~ 13%, and impurity is less than 0.02%, and surplus is magnesium; The invention still further relates to the preparation method of aforesaid siliceous heat resisting magnesium-rare earth alloy, described method comprises: raw material preheating, melting and subsequent heat treatment; Described melting is at flux or SF 6and CO 2carry out under mixed gas protected; Described subsequent heat treatment for described siliceous heat resisting magnesium-rare earth alloy is carried out solution treatment, ageing treatment.Present invention process is simple, and content of rare earth is lower, while raising alloy strength, ensure that excellent plasticity, by adjustment alloying constituent and thermal treatment process, the magnesium alloy of high-strength and high ductility heat-resistant antifriction, it is multi-field to can be applicable to Automotive Aviation space flight military project etc., meets the needs of various application occasions.

Description

Siliceous heat resisting magnesium-rare earth alloy and preparation method thereof
Technical field
The present invention relates to the magnesium alloy in a kind of structural metallic materials field and preparation method thereof, specifically, what relate to is a kind of siliceous heat resisting magnesium-rare earth alloy and preparation method thereof.
Background technology
Magnesium alloy is the lightest structural metallic materials of application at present, has high specific strength, specific rigidity, good heat conduction, conduction and capability of electromagnetic shielding, has broad application prospects in fields such as automobile, electronics, household electrical appliances, communication, instrument and space flight and aviation.Especially can meet the requirement of automobile industry in lightweight, less energy-consumption, high-environmental, therefore receive and pay close attention to widely.But the ordinary magnesium alloy at high temperature low and defect that is plasticity difference of intensity constrains its application on engine and power system part.So improve the mechanical property of magnesium alloy, comprise hot strength, plasticity, creep resistance and wear resistance etc. are the bases expanding its industrial application.Therefore, need to develop high performance heat resistance magnesium alloy.In recent years, research finds can propose heavy alloyed high-temperature behavior and creep resistance largely adding of rare earth element, therefore a series of heat resistance magnesium alloy that can use when 200 ~ 250 DEG C of conditions are long is developed, as Mg-Y-RE series alloy WE54 and WE43 alloy, these alloys obtain commercial applications.As cast condition WE54 alloy is after T6 process, and room temperature tensile intensity is 280MPa, and yield strength is 172MPa, and unit elongation is 2%; When 200 DEG C, tensile strength is 240MPa, yield strength 150MPa, and unit elongation is 7%; 200 DEG C/80MPa creep 100h deflection is 0.1%.
Literature search for prior art finds, Gd and Y element have good solution strengthening and ageing strengthening effect in the magnesium alloy, can significantly improve the performance of magnesium alloy, thus obtains Mg-Gd-Y system alloy.At patent documentation, Chinese patent, its publication number is describe a kind of high-strength heat-resistant rare earth magnesium alloy in CN1804083A, and its component and weight percent are: Gd2 ~ 10%, Y3 ~ 12%, the weight sum of Gd and Y be 13 ~ 14%, Zr0.3 ~ 0.7% and be not more than 0.3% activating element (any one in Zn, Ag, Cu, Sr, Sr, Ca, Ti, Bi, Cd), or the Mn of 0.6 ~ 1.5% and be not more than 0.3% activating element (Sn, Si, Sb, Ca any one), all the other are magnesium.This magnesium-rare earth forms netted phase structure by precipitate, has high intensity and creep resistance, is 180MPa 300 DEG C of condition smallest limit tensile strength.But this patent middle-weight rare earths composition is higher and be not optimized, bring the increase of cost on the one hand, high rare-earth content causes plasticity and the slightly poor application constraining its comprehensive demand in power system part of other performances on the other hand; Further, Si element only adds and very micro-together with Mn, is not as special strengthening element.Mg-Al-Si and Mg-Al-Si-RE of Si is contained (as Chinese patent about piston applications type in conjunction with in current patent, its publication number is CN1796024A) and Mg-Zn-Si-RE class alloy (as Chinese patent: application number is 200410102511, publication number is CN1886528A and publication number is CN101027420A) there is good resistance toheat and wear resisting property, the comprehensive excellent properties that the magnesium alloy that the present invention is intended to comprehensively contain Si and rare earth element has, optimize rational RE content and subsequent heat treatment technique, obtain a kind of high-performance magnesium-alloy of high-strength and high ductility heat-resistant antifriction.
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of siliceous heat resisting magnesium-rare earth alloy and preparation method thereof.By adding Gd in Mg, Y, Zr and a small amount of Si element, and optimize solid solution and aging technique parameter, realize under rational rare earth element total amount, obtain excellent room temperature and hot strength and plasticity, and put forward heavy alloyed wear resistance while the resistance toheat keeping alloy, obtain the heat resistance magnesium alloy of excellent combination property.
The present invention is achieved by the following technical solutions:
First aspect, the present invention relates to a kind of siliceous heat resisting magnesium-rare earth alloy, and described alloy comprises each component of following weight percent:
Gd5～10%，
Y2～8%，
Si0.3～2%，
Zr0.35～0.8%，
Gd+Y11～13%，
Impurity is less than 0.02%,
Surplus is magnesium.
Preferably, the weight percent of each composition of described impurity is: Fe < 0.005%, Cu < 0.005%, Ni < 0.002%, Ca < 0.01%.
Second aspect, the invention still further relates to the preparation method of aforesaid siliceous heat resisting magnesium-rare earth alloy, described method comprises: raw material preheating, melting and subsequent heat treatment:
Step 1, raw material preheating: raw material magnesium ingot, Mg-Si, Mg-Gd, Mg-Y and Mg-Zr master alloy are carried out preheating;
Step 2, melting: described melting is at flux or SF 6and CO 2carry out under mixed gas protected, comprise the steps:
Step 2.1, adds hot smelting by magnesium ingot;
Step 2.2, after magnesium ingot melts completely, adds Mg-Si master alloy and stirs, then adds Mg-Gd master alloy, Mg-Y master alloy, Mg-Zr master alloy successively, insulation, adds refining agent refining, leaves standstill, skim, casting ladle casting or low-pressure casting, obtain siliceous heat resisting magnesium-rare earth alloy;
Step 3, subsequent heat treatment comprises the steps:
Described siliceous heat resisting magnesium-rare earth alloy is carried out solution treatment, ageing treatment.
Preferably, in step 1, described preheating temperature is 180 ~ 220 DEG C.
Preferably, in step 2.2, add Mg-Si master alloy when magnesium liquid temp is 660 ~ 680 DEG C, churning time is 3 ~ 5 minutes; Mg-Gd master alloy is added when magnesium liquid temp is 730 ~ 750 DEG C, Mg-Y alloy is added after magnesium liquid temp gos up to 730 ~ 750 DEG C and be stable, when magnesium liquid temp is 780 ~ 790 DEG C, add Mg-Zr master alloy, described holding temperature is 780 DEG C, and soaking time is 5 ~ 15min.
Preferably, in step 2.2, described refining time is 5 ~ 15 minutes, and described dwell temperature is 760 ~ 780 DEG C, and described time of repose is 20 ~ 30 minutes, described in temperature of skimming be 700 ~ 720 DEG C.
Preferably, in described step 3, the temperature of described solution treatment is 480 ~ 520 DEG C, and the time is 4 ~ 20h; The temperature of described ageing treatment is 200 ~ 250 DEG C, and the time is 8 ~ 50h.
Preferably, the massfraction ﹥ 99.9% of magnesium in described magnesium ingot, described flux and refining agent are for containing MgCl 2, KCl, CaF 2magnesium alloy flux.
Preferably, described SF 6and CO 2sF in mixed gas 6percent by volume is 0.2%.
Preferably, adjoint stirring in described refining process.
The present invention has following beneficial effect:
(1) alloy of the present invention is by adding a small amount of Si, and is optimized further by the content of Gd and Y, makes alloy have higher intensity and good plasticity; Under the prerequisite ensureing enough strengthening effects, control rare earth element total amount, the Si added forms Mg 2si and (RE xsi y) hard phase, its fusing point is high, and specific rigidity is high, can effectively put forward heavy alloyed wear resistance; Add Zr by the remarkable crystal grain thinning of heterogeneous forming core, strengthen refined crystalline strengthening effect and improve alloy plasticity;
(2) the present invention combines and optimizes solid solution and aging technique parameter, increases Precipitation phase amount and makes its refinement.By above principle and method, make alloy of the present invention have content of rare earth lower, intensity is high, the excellent specific property such as good and heat-resistant antifriction of plasticity.
(3) present invention process is simple, and content of rare earth is lower, while raising alloy strength, ensure that excellent plasticity, and by adjustment alloying constituent and thermal treatment process, obtains the magnesium alloy of the high-strength and high ductility heat-resistant antifriction of different premium properties combination.Be applicable to scale operation, it is multi-field to can be applicable to Automotive Aviation space flight military project etc., meets the needs of various application occasions.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
embodiment 1
The present embodiment relates to a kind of siliceous heat resisting magnesium-rare earth alloy, and described alloy comprises each component of following weight percent:
9%Gd, 2%Y, 0.5%Si and 0.35%Zr, all the other are Mg and inevitable impurity (weight percent is less than 0.02%).Wherein impurity content is: Fe < 0.005%, Cu < 0.005%, Ni < 0.002%, Ca < 0.01%.
The present embodiment also relates to the preparation method of this alloy of aforementioned silicon heat resisting magnesium-rare earth alloy, and described method comprises: raw material preheating, melting and subsequent heat treatment:
Step 1, raw material preheating: raw material magnesium ingot, Mg-Si, Mg-Gd, Mg-Y and Mg-Zr master alloy are carried out being preheated to 200 DEG C;
Step 2, melting: at SF 6and CO 2mixed gas (SF 6percent by volume is 0.2%) protection under carry out, comprise the steps: that (1) adds magnesium: in electrical crucible, add pure magnesium, carry out melting; (2) add Si: after magnesium melts completely, 680 DEG C time, add Mg-Si master alloy and stir 5 minutes; (3) add Gd and Y: after being warming up to 730 DEG C, add Mg-Gd master alloy, go up to add Mg-Y master alloy to when 730 DEG C until magnesium liquid temp; (4) Zr is added: raise magnesium liquid temp to 780 DEG C and add Mg-Zr master alloy; (5) refining: 780 DEG C of insulations after about 15 minutes, continuous electrorefining 15 minutes, refining process needs fully to stir; (6) cast: after refining 760 DEG C leave standstill 30 minutes, treat that magnesium liquid is cooled to 700 DEG C of skimming operations, with metal type dies casting, casting steel die is preheated to 250 DEG C, afterwards siliceous heat resisting magnesium-rare earth alloy;
Step 3, subsequent heat treatment: under temperature is 500 DEG C of conditions, carry out 6h solution treatment, is then under the condition of 250 DEG C in temperature, carries out 8h ageing treatment.
Implementation result: siliceous heat resisting magnesium-rare earth alloy prepared by the present embodiment at room temperature tensile intensity 330MPa, yield strength 210MPa, unit elongation 10%; 200 DEG C of tensile strength 310MPa, yield strength 190MPa, unit elongation 16%; Under 200 DEG C/80MPa condition, creep 100 hours deflections are 0.065%.
embodiment 2
The present embodiment relates to a kind of siliceous heat resisting magnesium-rare earth alloy, described alloy comprises each component of following weight percent: 8%Gd, 3%Y, 1%Si and 0.6%Zr, all the other are Mg and inevitable impurity (weight percent is less than 0.02%), and wherein impurity content is: Fe < 0.005%, Cu < 0.005%, Ni < 0.002%, Ca < 0.01%.
The present embodiment also relates to the preparation method of this alloy of aforementioned silicon heat resisting magnesium-rare earth alloy, and described method comprises: described method comprises: raw material preheating, melting and subsequent heat treatment:
Step 1, raw material preheating: raw material magnesium ingot, Mg-Si, Mg-Gd, Mg-Y and Mg-Zr master alloy are carried out being preheated to 220 DEG C;
Step 2, melting: at SF 6and CO 2mixed gas (SF 6percent by volume is 0.2%) protection under carry out, comprise the steps: that (1) adds magnesium: in electrical crucible, add pure magnesium, carry out melting; (2) add Si: after magnesium melts completely, 660 DEG C time, add Mg-Si master alloy and stir 4 minutes; (3) add Gd and Y: after being warming up to 740 DEG C, add Mg-Gd master alloy, go up to add Mg-Y master alloy to when 740 DEG C until magnesium liquid temp; (4) Zr is added: raise magnesium liquid temp to 790 DEG C and add Mg-Zr master alloy; (5) refining: 780 DEG C of insulations after about 10 minutes, continuous electrorefining 10 minutes, refining process needs fully to stir; (6) cast: after refining 770 DEG C leave standstill 25 minutes, treat that magnesium liquid is cooled to 710 DEG C of skimming operations, with metal type dies casting, casting steel die is preheated to 240 DEG C, afterwards siliceous heat resisting magnesium-rare earth alloy;
Step 3, subsequent heat treatment: under temperature is 500 DEG C of conditions, carry out 8h solution treatment, then under temperature is 225 DEG C of conditions, carries out 16h ageing treatment.
Implementation result: siliceous heat resisting magnesium-rare earth alloy prepared by the present embodiment at room temperature tensile intensity 350MPa, yield strength 220MPa, unit elongation 8%; 200 DEG C of tensile strength 320MPa, yield strength 205MPa, unit elongation 14%; Under 200 DEG C/80MPa condition, creep 100 hours deflections are 0.052%.
embodiment 3
The present embodiment relates to a kind of siliceous heat resisting magnesium-rare earth alloy, described alloy comprises each component of following weight percent: 10%Gd, 3%Y, 2%Si and 0.5%Zr, all the other are Mg and inevitable impurity (weight percent is less than 0.02%), and wherein impurity content is: Fe < 0.005%, Cu < 0.005%, Ni < 0.002%, Ca < 0.01%.
The present embodiment also relates to the preparation method of this alloy of aforementioned silicon heat resisting magnesium-rare earth alloy, and described method comprises: described method comprises: raw material preheating, melting and subsequent heat treatment:
Step 1, raw material preheating: raw material magnesium ingot, Mg-Si, Mg-Gd, Mg-Y and Mg-Zr master alloy are carried out being preheated to 210 DEG C;
Step 2, melting: at SF 6and CO 2mixed gas (SF 6percent by volume is 0.2%) protection under carry out, comprise the steps: that (1) adds magnesium: in electrical crucible, add pure magnesium, carry out melting; (2) add Si: after magnesium melts completely, 670 DEG C time, add Mg-Si master alloy and stir 3 minutes; (3) add Gd and Y: after being warming up to 750 DEG C, add Mg-Gd master alloy, go up to add Mg-Y master alloy to when 750 DEG C until magnesium liquid temp; (4) Zr is added: raise magnesium liquid temp to 790 DEG C and add Mg-Zr master alloy; (5) refining: 780 DEG C of insulations after about 5 minutes, continuous electrorefining 5 minutes, refining process needs fully to stir; (6) cast: after refining 780 DEG C leave standstill 20 minutes, treat that magnesium liquid is cooled to 720 DEG C of skimming operations, with metal type dies casting, casting steel die is preheated to 260 DEG C, afterwards siliceous heat resisting magnesium-rare earth alloy;
Step 3, subsequent heat treatment: under temperature is 490 DEG C of conditions, carry out 10h solution treatment, then under temperature is 200 DEG C of conditions, carries out 50h ageing treatment.
Implementation result: siliceous heat resisting magnesium-rare earth alloy prepared by the present embodiment at room temperature tensile intensity 360MPa, yield strength 230MPa, unit elongation 6%; 200 DEG C of tensile strength 340MPa, yield strength 215MPa, unit elongation 12%; Under 200 DEG C/80MPa condition, creep 100 hours deflections are 0.042%.
embodiment 4
The present embodiment relates to a kind of siliceous heat resisting magnesium-rare earth alloy, described alloy comprises each component of following weight percent: 5%Gd, 8%Y, 1.5%Si and 0.4%Zr, all the other are Mg and inevitable impurity, and wherein impurity content is: Fe < 0.005%, Cu < 0.005%, Ni < 0.002%, Ca < 0.01%.
The present embodiment also relates to the preparation method of this alloy of aforementioned silicon heat resisting magnesium-rare earth alloy, and described method comprises: described method comprises: raw material preheating, melting and subsequent heat treatment:
Step 1, raw material preheating: raw material magnesium ingot, Mg-Si, Mg-Gd, Mg-Y and Mg-Zr master alloy are carried out being preheated to 180 DEG C;
Step 2, melting: at SF 6and CO 2mixed gas (SF 6percent by volume is 0.2%) protection under carry out, comprise the steps: that (1) adds magnesium: in electrical crucible, add pure magnesium, carry out melting; (2) add Si: after magnesium melts completely, 670 DEG C time, add Mg-Si master alloy and stir 4 minutes; (3) add Gd and Y: after being warming up to 730 DEG C, add Mg-Gd master alloy, go up to add Mg-Y master alloy to when 730 DEG C until magnesium liquid temp; (4) Zr is added: raise magnesium liquid temp to 785 DEG C and add Mg-Zr master alloy; (5) refining: 780 DEG C of insulations after about 10 minutes, continuous electrorefining 10 minutes, refining process needs fully to stir; (6) cast: after refining 760 DEG C leave standstill 25 minutes, treat that magnesium liquid is cooled to 700 DEG C of skimming operations, with metal type dies casting, casting steel die is preheated to 250 DEG C, afterwards siliceous heat resisting magnesium-rare earth alloy;
Step 3, subsequent heat treatment: under temperature is 480 DEG C of conditions, carry out 20h solution treatment, then under temperature is 200 DEG C of conditions, after carrying out 50h ageing treatment.
Implementation result: siliceous heat resisting magnesium-rare earth alloy prepared by the present embodiment at room temperature tensile intensity 320MPa, yield strength 215MPa, unit elongation 7%; 200 DEG C of tensile strength 295MPa, yield strength 205MPa, unit elongation 15%; Under 200 DEG C/80MPa condition, creep 100 hours deflections are 0.067%.
embodiment 5
The present embodiment relates to a kind of siliceous heat resisting magnesium-rare earth alloy, described alloy comprises each component of following weight percent: 6%Gd, 6%Y, 0.3%Si and 0.8%Zr, all the other are Mg and inevitable impurity, and wherein impurity content is: Fe < 0.005%, Cu < 0.005%, Ni < 0.002%, Ca < 0.01%.
The present embodiment also relates to the preparation method of this alloy of aforementioned silicon heat resisting magnesium-rare earth alloy, and described method comprises: described method comprises: raw material preheating, melting and subsequent heat treatment:
Step 1, raw material preheating: raw material magnesium ingot, Mg-Si, Mg-Gd, Mg-Y and Mg-Zr master alloy are carried out being preheated to 220 DEG C;
Step 2, melting: containing MgCl 2, KCl, CaF 2magnesium alloy flux protection under carry out, comprise the steps:
(1) add magnesium: in electrical crucible, add pure magnesium, carry out melting; (2) add Si: after magnesium melts completely, 680 DEG C time, add Mg-Si master alloy and stir 5 minutes; (3) add Gd and Y: after being warming up to 740 DEG C, add Mg-Gd master alloy, go up to add Mg-Y master alloy to when 740 DEG C until magnesium liquid temp; (4) Zr is added: raise magnesium liquid temp to 790 DEG C and add Mg-Zr master alloy; (5) refining: 780 DEG C of insulations after about 10 minutes, continuous electrorefining 10 minutes, refining process needs fully to stir; (6) cast: after refining 770 DEG C leave standstill 25 minutes, treat that magnesium liquid is cooled to 710 DEG C of skimming operations, with metal type dies casting, casting steel die is preheated to 240 DEG C, afterwards siliceous heat resisting magnesium-rare earth alloy;
Step 3, subsequent heat treatment: under temperature is 520 DEG C of conditions, carry out 4h solution treatment, then under temperature is 200 DEG C of conditions, carries out 48h ageing treatment.
Implementation result: siliceous heat resisting magnesium-rare earth alloy prepared by the present embodiment at room temperature tensile intensity 310MPa, yield strength 210MPa, unit elongation 8%; 200 DEG C of tensile strength 290MPa, yield strength 200MPa, unit elongation 14%; Under 200 DEG C/80MPa condition, creep 100 hours deflections are 0.07%.
In sum, the present invention realizes under rational rare earth element total amount, obtains excellent room temperature and hot strength and plasticity, and put forward heavy alloyed wear resistance while the resistance toheat keeping alloy, obtain the heat resistance magnesium alloy of excellent combination property.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, any content not departing from technical solution of the present invention, the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all belong to the scope of technical solution of the present invention.

Claims (7)

1. a preparation method for siliceous heat resisting magnesium-rare earth alloy, is characterized in that, described method comprises: raw material preheating, melting and subsequent heat treatment:
Step 1, raw material preheating: raw material magnesium ingot, Mg-Si, Mg-Gd, Mg-Y and Mg-Zr master alloy are carried out preheating;
Step 2, melting: described melting is at flux or SF 6and CO 2carry out under mixed gas protected, comprise the steps:
Step 2.1, adds hot smelting by magnesium ingot;
Step 2.2, after magnesium ingot melts completely, adds Mg-Si master alloy and stirs, then adds Mg-Gd master alloy, Mg-Y master alloy, Mg-Zr master alloy successively, insulation, adds refining agent refining, leaves standstill, skim, casting ladle casting or low-pressure casting, obtain siliceous heat resisting magnesium-rare earth alloy;
Step 3, subsequent heat treatment: comprise the steps:
Described siliceous heat resisting magnesium-rare earth alloy is carried out solution treatment, ageing treatment;
Wherein, in step 1, described preheating temperature is 180 ~ 220 DEG C;
In step 3, the temperature of described solution treatment is 480 ~ 520 DEG C, and the time is 4 ~ 20h; The temperature of described ageing treatment is 200 ~ 250 DEG C, and the time is 8 ~ 50h;
Described siliceous heat resisting magnesium-rare earth alloy comprises each component of following weight percent:
Gd5～10％，
Y2～8％，
Si0.3～2％，
Zr0.35～0.8％，
Wherein, the content sum of Gd and Y is 11 ~ 13%,
Impurity is less than 0.02%,
Surplus is magnesium.
2. the preparation method of siliceous heat resisting magnesium-rare earth alloy as claimed in claim 1, it is characterized in that, each composition of described impurity and weight percent thereof are: Fe < 0.005%, Cu < 0.005%, Ni < 0.002%, Ca < 0.01%.
3. the preparation method of siliceous heat resisting magnesium-rare earth alloy as claimed in claim 1, is characterized in that, in step 2.2, adds Mg-Si master alloy when magnesium liquid temp is 660 ~ 680 DEG C, and churning time is 3 ~ 5 minutes; Mg-Gd master alloy is added when magnesium liquid temp is 730 ~ 750 DEG C, Mg-Y alloy is added after the rise of magnesium liquid temp is stable to 730 ~ 750 DEG C, when magnesium liquid temp is 780 ~ 790 DEG C, add Mg-Zr master alloy, described holding temperature is 780 DEG C, and soaking time is 5 ~ 15min.
4. the preparation method of siliceous heat resisting magnesium-rare earth alloy as claimed in claim 1, is characterized in that, in step 2.2, described refining time is 5 ~ 15 minutes, described dwell temperature is 760 ~ 780 DEG C, and described time of repose is 20 ~ 30 minutes, described in temperature of skimming be 700 ~ 720 DEG C.
5. the preparation method of siliceous heat resisting magnesium-rare earth alloy as claimed in claim 1, is characterized in that, the massfraction > 99.9% of magnesium in described magnesium ingot, and described flux and refining agent are for containing MgCl 2, KCl, CaF 2magnesium alloy flux.
6. the preparation method of siliceous heat resisting magnesium-rare earth alloy as claimed in claim 1, is characterized in that, described SF 6and CO 2sF in mixed gas 6percent by volume is 0.2%.
7. the preparation method of siliceous heat resisting magnesium-rare earth alloy as claimed in claim 1, is characterized in that, with stirring in described refining process.
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CN104928549B (en) * 2015-06-16 2018-05-04 上海交通大学 A kind of casting magnesium-rare earth alloy of high-strength high-elasticity modulus and preparation method thereof
CN105483485B (en) * 2015-12-08 2017-10-31 上海交通大学 A kind of cast Mg alloy with high strength and preparation method containing Zn and heavy rare earth Gd
CN106119582A (en) * 2016-06-23 2016-11-16 陕西友力实业有限公司 Utilize the method that microwave sintering prepares Si-Mg alloy
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