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Method for preparing high strength magnesium-lithium alloy

A magnesium-lithium alloy, high-strength technology, applied to magnesium alloys and their preparation, high-strength magnesium-lithium alloys of Gd and Zr elements and their preparation, in the field of adding Zn, which can solve the problem of the insignificant weight reduction effect of Li elements and the ability of plastic deformation The improvement is not obvious, the strength is low, etc., to achieve the effect of improving mechanical properties, high plasticity, and simple processing technology.

Active Publication Date: 2014-08-27
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the matrix is ​​α-Mg solid solution, the weight reduction effect brought by the addition of Li element is not obvious, and the improvement of plastic deformation ability is not obvious; when the matrix is ​​β-Li solid solution, the plastic deformation ability of the matrix is ​​very strong, but the strength is too low

Method used

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preparation example Construction

[0033] The preparation method of a high-strength magnesium-lithium alloy of the present invention is divided into three stages, namely smelting, plastic deformation and subsequent heat treatment process; wherein,

[0034] The smelting process is carried out under the protection condition of mixed gas of SF6 and CO2, and the steps are as follows:

[0035] (1) Baking material: take pure Mg, pure Zn, Mg-Gd master alloy, Mg-Zr master alloy and Li rod, and weigh the lithium salt flux according to 5-10% of the mass of the prepared alloy, and the lithium salt flux is determined by mass ratio It is a 3:1 mixture of LiCl and LiF. Then, preheat all the above-mentioned raw materials for more than 3 hours to reach 180°C-250°C for drying;

[0036] (2) Molten magnesium: put the dried described pure Mg and the lithium salt flux into a crucible resistance furnace and melt to form magnesium liquid;

[0037] (3) Adding Zn and Gd: When the temperature of the magnesium liquid reaches 700°C-740°...

Embodiment 1

[0046] The components and mass percentages of the high-strength magnesium-lithium alloy are: 10wt.% Li, 2.5wt.% Zn, 1wt.% Gd, 0.4wt.% Zr, and the total amount of impurity elements Si, Fe, Cu and Ni is 0.01 wt.%, Mg is 86.09wt.% (wt.% refers to the percentage of components in the total mass of the prepared alloy, the total mass is the sum of the mass of Mg, Li, Zn and various master alloys).

[0047] The preparation method of the high-strength magnesium-lithium alloy is as follows:

[0048] Firstly, the smelting process is carried out, and the whole smelting process is carried out under the protection condition of mixed gas of SF6 and CO2, specifically: Weigh pure Mg, pure Zn, Mg–Gd master alloy, Mg–Zr master alloy and Li rod respectively, and prepare according to the 5% of the alloy mass is weighed as a lithium salt flux, which is formed by mixing LiCl and LiF with a mass ratio of 3:1. Then, preheat all the above-mentioned raw materials for more than 3 hours to reach 180°C fo...

Embodiment 2

[0054] The components and mass percentages of the high-strength magnesium-lithium alloy are: 8wt.% Li, 5wt.% Zn, 2wt.% Gd, 0.6wt.% Zr, and the total amount of impurity elements Si, Fe, Cu and Ni is 0.015wt %, Mg is 84.385wt.% (wt.% refers to the percentage of the components in the total mass of the prepared alloy, which is the sum of the mass of Mg, Li, Zn and various master alloys.).

[0055] The preparation method of the high-strength magnesium-lithium alloy is as follows:

[0056] Firstly, the smelting process is carried out, and the whole smelting process is carried out under the protection condition of mixed gas of SF6 and CO2, specifically: Weigh pure Mg, pure Zn, Mg–Gd master alloy, Mg–Zr master alloy and Li rod respectively, and prepare according to the 5% of the alloy mass is weighed as a lithium salt flux, which is formed by mixing LiCl and LiF with a mass ratio of 3:1. Then, preheat all the above-mentioned raw materials for more than 3 hours to reach 180°C for dryi...

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Abstract

The invention discloses a method for preparing high strength magnesium-lithium alloy. The magnesium-lithium alloy comprises following components by weight percent: 6-10wt% of Li, 2.5-7.5wt% of Zn, 1-3wt% of Gd, 0.2-0.6wt% of Zr, less than 0.02wt% of impurity elements like Si, Fe, Cu and Ni, and the balance of Mg. The method comprises three steps of smelting, plastic deformation and thermal treatment, wherein the smelting comprises the steps of drying the materials, melting magnesium, adding Zn and Gd, adding Zr, adding Li and casting; the plastic deformation comprises the steps of homogenization treatment and plastic deformation processing; and the thermal treatment comprises the step of aging treatment. As elements like Zn and Gd are added into the magnesium-lithium alloy, quasi-crystal is taken as a strengthening phase to be introduced into the solidification structure of the magnesium-lithium alloy, and the added Zr is taken as a grain refiner, low density and high strength magnesium-lithium alloy is obtained after subsequent steps of plastic deformation and thermal treatment.

Description

technical field [0001] The invention relates to a magnesium alloy and a preparation method thereof, in particular to a high-strength magnesium-lithium alloy added with Zn, Gd and Zr elements and a preparation method thereof, belonging to the technical field of metal materials. Background technique [0002] Magnesium alloy has the advantages of low density, wide range of sources, high specific strength and specific stiffness, etc., and is known as "the green engineering material of the 21st century". By adding Li to magnesium alloys for alloying, its density can be further reduced and the plasticity of magnesium alloys can be improved. Therefore, magnesium-lithium alloys have broad potential application prospects in aerospace and other fields that require high weight reduction. At present, a major problem limiting the application of magnesium-lithium alloys is that their strength is low, which is difficult to meet the requirements of engineering applications. Therefore, the d...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C23/04
Inventor 张扬吴国华刘文才张亮张洁丁文江
Owner SHANGHAI JIAO TONG UNIV
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