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Low-density high-strength magnesium lithium alloy and preparing method thereof

A magnesium-lithium alloy and high-strength technology, which is applied in the field of low-density and high-strength magnesium-lithium alloy and its preparation, can solve the problems of narrowing the advantages of ordinary magnesium alloy and magnesium-lithium alloy, difficulty in application of magnesium-lithium alloy, etc., and achieves convenient production process and operation. , the effect of hindering dislocation movement and slip, and increasing strength

Inactive Publication Date: 2018-02-23
江苏立美航材科技有限公司
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Problems solved by technology

[0004] At present, the main methods to improve the performance of magnesium-lithium alloys are to control the lithium content between 5.7% and 10.3%, and the percentage content of other alloying elements except Li to be above 3%, so that a two-phase coexistence magnesium-lithium alloy can be formed, and at the same time 3% The addition of the above alloy elements can greatly improve the mechanical properties of the alloy, but the composition and ratio of the alloy will inevitably cause the density of the magnesium-lithium alloy to be above 1.5 g / cm3, which will greatly reduce the density of ordinary magnesium alloys and magnesium-lithium alloys. The advantages on the magnesium-lithium alloy have caused difficulties in the application

Method used

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preparation example Construction

[0021] The preparation method of the low-density high-strength magnesium-lithium alloy is divided into vacuum induction melting and plastic deformation treatment, wherein the vacuum induction melting includes the following steps:

[0022] (1) Weigh a certain mass of pure magnesium, pure lithium, pure aluminum, Mg-Zr master alloy, Mg-La master alloy, Mg-Ce master alloy according to the magnesium-lithium alloy composition and its mass percentage, and the pure magnesium , pure aluminum, Mg-Zr master alloy, Mg-La master alloy, and Mg-Ce master alloy are dried at 200~250°C;

[0023] (2) Put the dried pure magnesium ingot into the crucible. Before the smelting starts, the atmosphere in the furnace is pumped down to below 1Pa, then fill the furnace with argon gas of 20~86Kpa as a protective gas, and then start heating. The crucible The temperature is controlled at 750~800°C for pure magnesium melting until the melting of the magnesium ingot is complete;

[0024] (3) After the magnes...

Embodiment 1

[0030] A low-density high-strength magnesium-lithium alloy, the mass percentage of its components is: 14%Li, 1.5%Al, 0.2%Zr, 0.8%La, 0.2%Ce, the total amount of impurity elements Fe, Ni, Cu, Si≤0.2 %, the balance is Mg. The pure magnesium, pure aluminum, Mg-30Zr master alloy, Mg-35La master alloy and Mg-25Ce master alloy are dried at 250°C. Put the dried pure magnesium ingot into the crucible. Before the melting starts, the atmosphere in the furnace is pumped down to below 1Pa, and then 70Kpa argon is filled into the furnace as a protective gas, and then heating is started. The temperature of the crucible is controlled at 780°C Carry out pure magnesium melting until the magnesium ingot is melted. After the magnesium ingot is melted, control the temperature of the molten magnesium at 740°C, add Mg-30Zr master alloy, Mg-35La master alloy, and Mg-25Ce master alloy in sequence through the feeding cabin in the vacuum induction melting furnace, and control the temperature of the me...

Embodiment 2

[0034] A low-density high-strength magnesium-lithium alloy, the mass percentage of which is: 12% Li, 1% Al, 0.5% Zr, 0.8% La, 0.6% Ce, and the total amount of impurity elements Fe, Ni, Cu, and Si ≤ 0.2 %, the balance is Mg. Dry pure magnesium, pure aluminum, Mg-30Zr master alloy, Mg-35La master alloy, and Mg-25Ce master alloy at 250°C; put the dried pure magnesium ingot into the crucible, and melt Before starting, the atmosphere in the furnace is evacuated to below 1Pa, and then 70Kpa argon is filled into the furnace as a protective gas, and then heating is started, and the temperature of the crucible is controlled at 780°C for pure magnesium melting until the magnesium ingot is completely melted. After the magnesium ingot is melted, control the temperature of the molten magnesium at 740°C, add Mg-30Zr master alloy, Mg-35La master alloy, and Mg-25Ce master alloy in sequence through the feeding cabin in the vacuum induction melting furnace, and control the temperature of the me...

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Abstract

The invention provides a low-density high-strength magnesium-lithium alloy and a preparation method thereof. The components and mass percentages of the magnesium-lithium alloy are: 11-15% Li, 0.5-4% Al, 0.05-0.5% Zr, 0.2~1.2%La, 0.1~0.6%Ce, the total amount of impurity elements Fe, Ni, Cu, Si≤0.2%, and the balance is Mg. The preparation method of the magnesium-lithium alloy involved in the present invention includes vacuum induction melting and plastic deformation treatment. The magnesium-lithium alloy processed by means of alloying, crystal grain refinement and deformation treatment in the present invention has high strength and plasticity under the premise of ensuring low density, and at the same time has excellent machining performance.

Description

technical field [0001] The invention relates to a low-density high-strength magnesium-lithium alloy and a preparation method thereof, in particular to a vacuum induction solvent-free low-density high-strength magnesium-lithium alloy and a preparation method thereof. Background technique [0002] With modern technology's pursuit of equipment lightweight and energy saving and emission reduction becoming more and more urgent, the development of new low-density and high-strength materials has attracted more and more attention from researchers. History has proved that materials are the material basis and guide for the development of human society. , while new materials are a milestone in the progress of human society. As the theoretically lightest structural material currently known, magnesium-lithium alloy has become the focus of research at home and abroad in recent years. Magnesium-lithium alloy not only has high specific stiffness and specific strength, but also has good cut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/03C22F1/06
CPCC22C23/00C22C1/03C22F1/06
Inventor 葛大梁朱权乔培玉杨会齐龚斌吴国清
Owner 江苏立美航材科技有限公司
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