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High-strength heat-resisting magnesium alloy and its preparing method

A magnesium alloy, high-strength technology, applied in the field of metal materials and metallurgy, can solve the problems of lack of dilution steps, aggravate the effect of oxidation and gas absorption of alloy melt, and the difficulty of large-scale smelting and production protection of magnesium alloy liquid, so as to reduce inclusions Quantity, reducing the difficulty of protection, and reducing the effect of melting temperature

Active Publication Date: 2005-10-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of pure rare earths with high melting points as raw materials, the smelting temperature used in the smelting of Mg-Gd-Y ternary alloys is very high, but there is no dilution step in the subsequent process; and in order to ensure the grain refinement effect of Zr and The heat preservation and pouring temperature is as high as 830°C, which will inevitably aggravate the effect of oxidation and gas absorption of the alloy melt
In addition, smelting and pouring at such a high temperature also brings great difficulties to the large-scale smelting production protection of the extremely flammable magnesium alloy liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preheat pure magnesium, master alloys Mg-Gd, Mg-Y, and Mg-Zr to 180°C, and then put pure magnesium in SF 6 / CO 2Melting in a gas-protected furnace, when the temperature of the molten magnesium reaches 720°C, add 20wt% of the Mg-Gd master alloy directly into the molten magnesium, and then add 3.4wt% when the temperature of the molten magnesium rises to 720°C after the Mg-Gd is melted For the Mg-Y master alloy, raise the temperature of the magnesium liquid to 760°C and add 1.2wt% Mg-Zr master alloy, skim off the surface dross after it melts, stir for 2 minutes, and then raise the temperature of the magnesium liquid to 780°C After 20 minutes of heat preservation, the temperature is lowered to 750°C, and the electric refining is continued for 6 minutes. The standing time after refining is controlled at 25 minutes. After the magnesium liquid is cooled to 690°C, the scum on the surface is skimmed for casting. The steel mold for casting is preheated to 200°C.

[0022] The so...

Embodiment 2

[0030] Preheat pure magnesium, master alloys Mg-Gd, Mg-Y, and Mg-Zr to 200°C, and then put pure magnesium in SF 6 / CO 2 Melting in a gas-protected furnace, when the temperature of the molten magnesium reaches 730°C, add 34wt% Mg-Gd master alloy directly into the molten magnesium, and then add 10wt% Mg-Gd master alloy when the temperature of the molten magnesium rises to 730°C Mg-Y master alloy, after raising the temperature of the magnesium liquid to 770°C, add 2wt% Mg-Zr master alloy, skim off the surface scum after it melts, stir for 2.5 minutes, then raise the temperature of the magnesium liquid to 790°C and keep it for 25 After 10 minutes, the temperature is lowered to 753°C, and the continuous electric refining is carried out for 8 minutes. The standing time after refining is controlled at 30 minutes. After the magnesium liquid is cooled to 705°C, the scum on the surface is skimmed off for casting. The casting steel mold is preheated to 225°C.

[0031] The solution trea...

Embodiment 3

[0039] Preheat pure magnesium, master alloys Mg-Gd, Mg-Y, and Mg-Zr to 220°C, and then put pure magnesium in SF 6 / CO 2 Melting in a gas-protected furnace, when the temperature of the molten magnesium reaches 740°C, add 50wt% Mg-Gd master alloy directly into the molten magnesium, and add 20wt% Mg-Gd master alloy when the temperature of the molten magnesium rises to 740°C For Mg-Y master alloy, raise the temperature of the magnesium liquid to 780°C and add 2.7wt% Mg-Zr master alloy, skim off the surface dross after it melts, stir for 3 minutes, then raise the temperature of the magnesium liquid to 800°C and keep it warm After 30 minutes, cool down to 755°C, continue electric refining for 10 minutes, and control the standing time after refining to 40 minutes. After the magnesium liquid is cooled to 720°C, skim off the scum on the surface for casting. The casting steel mold is preheated to 250°C.

[0040] The solution treatment regime of the Mg-Gd-Y-Zr alloy is 500°C for 11 hou...

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Abstract

This invention is a high-intensive heat-fast magnesium alloy and its preparation method, and the magnesium alloy has the following components with their weight percentages: 6-15%Gd, 1-6%Y, 0.35-0.8%Zr, 0-1.5%Ca, and impurity elements Si, Fe, Cu and Ni with their gross less than 0.02%, and the rest percentage is Mg. while melting, add Gd, Y, Zr in the Mg melt in Mg-Gd, Mg-Y, Mg-Zr forms, then carry out solution treatment to the magnesium alloy under 450-500deg.C for 6-12 hours, squeeze in in 350-450deg.C, treat in time the squeezing stick for 10-16 hours in 225deg.C to improve its strength.

Description

technical field [0001] The invention relates to a high-strength heat-resistant magnesium alloy and a preparation method thereof, in particular to a high-strength heat-resistant magnesium alloy obtained by adding alloy elements (Gd, Y) or changing the process conditions of smelting, thermal processing and heat treatment and its preparation method. The preparation method, the prepared magnesium alloy has mechanical properties such as room temperature strength, instantaneous high temperature strength and hardness superior to traditional commercial magnesium alloys. It belongs to the field of metal materials and metallurgy. Background technique [0002] Insufficient strength, poor heat resistance and poor corrosion 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, heat resistance,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C23/06C22F1/06
Inventor 何上明曾小勤彭立明丁文江
Owner SHANGHAI JIAO TONG UNIV
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