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High-strength heat-resisting magnesium alloy and preparing method

A magnesium alloy, high-strength technology, applied in the field of metal materials, can solve problems such as limiting the wide application of WE54 alloy and low room temperature performance

Inactive Publication Date: 2006-08-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that the lower room temperature performance limits the wide application of WE54 alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The composition (percentage by weight) of the alloy is: 3.0% Y, 4.0% Sm, 0.5% Zr, the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02%, and the balance is Mg.

[0013] Alloys are prepared according to the above ingredients, and the casting process is as follows: firstly, preheat pure magnesium, intermediate alloys Mg-Y, Mg-Sm and Mg-Zr to 200°C, and then put pure magnesium in CO 2 / SF 6 Melt in a gas-protected furnace, add Mg-Y master alloy at 730°C after the magnesium ingot is melted, add Mg-Sm master alloy when the temperature of the magnesium liquid rises to 730°C after Mg-Y is melted, and heat up to 760°C for 30 minutes , then add the Mg-Zr intermediate alloy, remove the scum on the surface after it melts, stir for 3 minutes, then raise the temperature of the magnesium liquid to 760°C and keep it for 20 minutes, then refine at 760°C for 6 minutes, after refining, raise the temperature to above 770°C, statically Set aside for 30 minutes, and th...

Embodiment 2

[0016] The composition (percentage by weight) of the alloy is: 6.0% Y, 6.0% Sm, 0.8% Zr, the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02%, and the balance is Mg.

[0017] Alloys are prepared according to the above ingredients, and the casting process is as follows: firstly, preheat pure magnesium, intermediate alloys Mg-Y, Mg-Sm and Mg-Zr to 200°C, and then put pure magnesium in CO 2 / SF 6 Melt in a gas-protected furnace, add Mg-Y master alloy at 730°C after the magnesium ingot is melted, add Mg-Sm master alloy when the temperature of the magnesium liquid rises to 730°C after Mg-Y is melted, and heat up to 760°C for 30 minutes , then add the Mg-Zr intermediate alloy, remove the scum on the surface after it melts, stir for 3 minutes, then raise the temperature of the magnesium liquid to 760°C and keep it for 20 minutes, then refine at 760°C for 6 minutes, after refining, raise the temperature to above 770°C, statically Set aside for 30 minutes, and th...

Embodiment 3

[0020] The composition (percentage by weight) of the alloy is: 12.0% Y, 2.0% Sm, 0.35% Zr, the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02%, and the balance is Mg.

[0021] Alloys are prepared according to the above ingredients, and the casting process is as follows: firstly, preheat pure magnesium, intermediate alloys Mg-Y, Mg-Sm and Mg-Zr to 200°C, and then put pure magnesium in CO 2 / SF 6 Melt in a gas-protected furnace, add Mg-Y master alloy at 730°C after the magnesium ingot is melted, add Mg-Sm master alloy when the temperature of the magnesium liquid rises to 730°C after Mg-Y is melted, and heat up to 760°C for 30 minutes , then add the Mg-Zr intermediate alloy, remove the scum on the surface after it melts, stir for 3 minutes, then raise the temperature of the magnesium liquid to 760°C and keep it for 20 minutes, then refine at 760°C for 6 minutes, after refining, raise the temperature to above 770°C, statically Set aside for 30 minutes, and ...

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Abstract

This invention relates to a high strength and anti-heat Mg alloy and its preparation method, in which, the composition and its weight percentage of the Mg alloy is: 3-12%Y, 2-6%Sm, 0.35-0.8% Zr, the gross volume of impurities of Si, Fe, Cu and Ni is less than 0.02% and Mg for the rest, in smelting, Y, Sm and Zr are added into a Mg molten bath in the way of intermediate alloy of Mg-Y, Mg-Sm and Mg-Zr to be smelted to get the Mg alloy to be treated in solid solution under 500-550deg.C for 6-12 h, after that, it is undergone for 6-50 h aging treatment under 175-250deg.C to increase its strength.

Description

technical field [0001] The invention relates to an alloy in the technical field of metal materials and a preparation method thereof, in particular to a high-strength heat-resistant magnesium alloy and a preparation method thereof. Background technique [0002] Insufficient strength and poor heat resistance have seriously hindered the pace of magnesium alloys replacing aluminum alloys and other materials in aerospace, military and other industries. Rare earth elements, especially Y, Nd, etc., play a significant role in improving the strength and heat resistance of magnesium alloys. Sm and Nd belong to the rare earth elements of the Ce group. The atomic number of Sm is 62, the maximum solid solubility in magnesium is 5.8mass% (0.99at%), and the equilibrium phase formed with magnesium is Mg 41 SM 5 , The eutectic temperature is 815K. The maximum solid solubility of Sm in magnesium is greater than the maximum solid solubility of Nd in magnesium (3.6mass% (0.63at%)), therefor...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03B22D11/16C22F1/06
Inventor 李大全王渠东丁文江
Owner SHANGHAI JIAO TONG UNIV
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