High-strength creep resistant magnesium alloy and method of producing the same

A magnesium alloy and alloy technology, which is applied in the field of high-strength creep-resistant magnesium alloy and its preparation, can solve the problems of affecting the solid solution effect, not being able to fully exert aging strengthening, and being contrary to lightweight design.

Inactive Publication Date: 2008-04-02
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in terms of heat resistance, too high Zn content will affect the solid solution effect, so that the effect of aging strengthening cannot be fully exerted, which is undoubtedly not conducive to the improvement of high temperature performance of magnesium alloys and is contrary to the original intention of lightweight design

Method used

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  • High-strength creep resistant magnesium alloy and method of producing the same
  • High-strength creep resistant magnesium alloy and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Alloy composition (percentage by weight): 6% Y, 5% Gd, 2% Zn, impurity elements are less than 0.02%, and the rest is Mg.

[0026] The specific steps of the melting process of the alloy are as follows: (1) configure the alloy according to the above components, add pure magnesium into the resistance crucible furnace, and use SF 6 / CO 2 Mixed gas for protection; (2) After the magnesium is completely melted, add industrial pure zinc at 640°C; (3) When the temperature of the magnesium liquid reaches 740°C, directly add the Mg-Gd master alloy into the magnesium liquid, Mg-Gd After melting, the temperature of the molten magnesium rises to 740°C before adding the Mg-Y master alloy; (4) After the temperature of the magnesium liquid rises to 770°C, add the Mg-Zr master alloy and stir for 4 minutes to promote its full melting; (5) The temperature of the high-magnesium liquid is 790°C, keep the temperature for 20 minutes, then cool down to 750°C, refine for 6 minutes, and control ...

Embodiment 2

[0030] Alloy composition (percentage by weight): 6% Y, 5% Gd, 2% Zn, 0.5% Zr, impurity elements are less than 0.02%, and the rest is Mg.

[0031] The specific steps of the melting process of the alloy are as follows: (1) configure the alloy according to the above components, add pure magnesium into the resistance crucible furnace, and use SF 6 / CO 2 Mixed gas for protection; (2) After the magnesium is completely melted, add industrial pure zinc at 690°C; (3) When the temperature of the magnesium liquid reaches 720°C, directly add the Mg-Gd master alloy into the magnesium liquid, Mg-Gd After melting, when the temperature of the magnesium liquid rises to 720°C, add the Mg-Y master alloy; (4) After the temperature of the magnesium liquid rises to 760°C, add the Mg-Zr master alloy, and stir for 2 minutes to promote its full melting; (5) liter The temperature of the high magnesium liquid is 780°C, keep it warm for 20 minutes, then cool down to 750°C, refine for 6 minutes, and cont...

Embodiment 3

[0035] Alloy composition (percentage by weight): 7% Y, 4% Gd, 0.5% Zn, 0.3% Zr, impurity elements are less than 0.02%, and the rest is Mg.

[0036] The specific steps of the melting process of the alloy are as follows: (1) configure the alloy according to the above components, add pure magnesium into the resistance crucible furnace, and use SF 6 / CO 2 Mixed gas for protection; (2) After the magnesium is completely melted, add industrial pure zinc at 690°C; (3) When the temperature of the magnesium liquid reaches 725°C, directly add the Mg-Gd master alloy into the magnesium liquid, Mg-Gd After melting, the temperature of the molten magnesium rises to 725°C before adding the Mg-Y master alloy; (4) After the temperature of the magnesium liquid rises to 760°C, add the Mg-Zr master alloy and stir for 2 minutes to promote its full melting; (5) The temperature of the high magnesium liquid is 780°C, keep it warm for 20 minutes, then cool down to 750°C, refine for 6 minutes, and contr...

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Abstract

A high-intensity anti-creep magnesium alloy and the preparation method thereof, wherein, the compositions by weight percentage of magnesium alloy are as follows: Y is more than or equal to 6 percent and less than or equal to 12 percent, Gd is more than or equal to 1 percent and less than or equal to 6 percent, Zn is more than or equal to 0.5 percent and less than or equal to 3 percent, and Zr is more than or equal to 0.5 percent and less than or equal to 3 percent, the residue is Mg and the unavoidable impurities. When smelting, medium different alloys with Mg-Y, Mg-Gd, and Mg-Zr are used to add components of Y, Gd and Zr into the melted magnesium, the magnesium alloy after the melting undergoes melting for 6-24 hours at 500-550 DEG C, followed by seasoning for 12-48 hours at 225-300 DEG C, then the magnetic alloy is excellent in intensity and anti-creep function at 300 DEG C.

Description

technical field [0001] The invention relates to a high-strength creep-resistant magnesium alloy and a preparation method thereof, in particular to a method for achieving high strength and creep resistance of magnesium alloys by adding alloy elements (Y, Gd, Zn) and adjusting corresponding heat treatment processes , belongs to the field of metal materials and metallurgy. Background technique [0002] As the lightest metal structure material, magnesium alloy can meet the increasingly stringent requirements of automobile exhaust emission, and can produce new automobiles with light weight, low fuel consumption and environmental protection, so it has received extensive attention in the automobile industry. However, low high temperature strength and creep resistance restrict its application in engine and power system parts. Rare earth is considered to be an important element used to improve the heat resistance of magnesium alloys, such as Mg-Y-Nd-based alloys WE54 and WE43 that h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03B22D21/04C22F1/06
Inventor 顾金海王渠东高岩金田润也
Owner SHANGHAI JIAO TONG UNIV
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