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Preparation method of magnesium-lithium alloy with reinforced LPSO (long-period stacking ordered) structure

A long-period structure, magnesium-lithium alloy technology, applied in the field of magnesium-lithium alloy materials, self-generated magnesium-lithium alloys strengthened by LPSO structure, and can solve the problems of low-density mechanical properties, poor high-temperature performance, poor plasticity, etc., and achieve low Density, promote precipitation, improve the effect of mechanical properties

Inactive Publication Date: 2018-01-26
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of this application is to provide a high-strength Mg-Li-Gd-Y-Zn-Zr magnesium-lithium alloy for the deficiencies in the prior art, which can be obtained by adding a certain amount of Gd, Y and Zn element, and adding a small amount of Zr to refine the structure, and through certain heat treatment and plastic deformation processing, the LPSO long-period stacking structure is spontaneously obtained in the magnesium-lithium alloy structure, so that the alloy has a lower density and excellent mechanical properties. Performance, solve the problems of low absolute strength, poor high temperature performance and poor plasticity of existing magnesium-lithium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A high-strength magnesium-lithium alloy reinforced with an LPSO structure, comprising the following components in terms of mass percentage: 9.5% Li, 8% Gd, 4.5% Y, 1.5% Zn, 0.8% Zr, and impurity elements Fe and Cu are introduced into the raw materials The total amount of Ni and Ni is not more than 0.02%, and the rest is Mg.

[0038] The preparation method of above-mentioned alloy is:

[0039] (1) Melting and casting

[0040] The smelting and casting processes in this step are all completed under the protection of argon gas in a vacuum resistance furnace.

[0041] The melting crucible used in the smelting process is made of pure titanium, and the raw materials after surface decontamination, drying and weighing are sequentially divided into pure Mg ingot, Mg-25%Gd master alloy (mass fraction, the same below), Mg-25%Y The master alloy, the Mg-25%Zr master alloy, the pure Zn ingot and the pure Li ingot are put into the crucible in order to be melted.

[0042] Evacuate to...

Embodiment 2

[0053] A high-strength magnesium-lithium alloy reinforced with an LPSO structure, comprising the following components by mass percentage: 10.5% Li, 8% Gd, 6% Y, 1% Zn, 0.8% Zr, and impurity elements Fe and Cu are introduced into the raw materials The total amount of Ni and Ni is not more than 0.02%, and the rest is Mg.

[0054] The preparation method of this alloy is:

[0055] (1) Melting and casting

[0056] The smelting and casting processes in this step are all completed under the protection of argon gas in a vacuum resistance furnace.

[0057] The melting crucible used in the smelting process is made of pure titanium, and the raw materials after surface decontamination, drying and weighing are in order of pure Mg ingot, Mg-25% Gd master alloy, Mg-25% Y master alloy, Mg-25% Zr master alloy, pure Zn ingot and pure Li ingot are placed in the crucible in sequence to be melted.

[0058] Vacuum down to a system pressure of 0.5×10 -3 At Pa, argon gas is introduced until the p...

Embodiment 3

[0068] A high-strength magnesium-lithium alloy reinforced by LPSO structure, including the following components by mass percentage: 12% Li, 8% Gd, 4% Y, 2% Zn, 0.8% Zr, and the impurity elements Fe and Cu are brought into the raw materials The total amount of Ni and Ni is not more than 0.02%, and the rest is Mg.

[0069] The preparation method of this alloy is:

[0070] (1) Melting and casting

[0071] The smelting and casting processes of the present invention are all completed under the protection condition of argon gas in a vacuum resistance furnace.

[0072] The melting crucible used in the smelting process is made of pure titanium, and the raw materials after surface decontamination, drying and weighing are in order of pure Mg ingot, Mg-25% Gd master alloy, Mg-25% Y master alloy, Mg-25% Zr master alloy, pure Zn ingot and pure Li ingot are placed in the crucible in sequence to be melted.

[0073] Vacuum down to a system pressure of 0.2×10 -3 At Pa, argon gas is introdu...

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Abstract

The invention provides magnesium-lithium alloy with a reinforced LPSO (long-period stacking ordered) structure and a preparation method thereof, which belong to the technical field of high-strength alloy and preparation thereof. The magnesium-lithium alloy with the reinforced LPSO structure is prepared from the following components: Li, Gd, Y, Zn, Zr, Mg and inevitable impurity elements. Accordingto the preparation method of the magnesium-lithium alloy with the reinforced LPSO structure, Gd, Y and Zn elements are added at the same time, so that the Gd, Y and Zn elements are solidly dissolvedin a magnesium-lithium alloy substrate, and homogenization, plastic deformation and aging heat treatment are performed, so that authigene occurs in an alpha-Mg phase and a beta-Li phase so as to obtain the laminar LPSO structure, and the effect of reinforcing the beta-Li phase is achieved, thereby reinforcing the alloy. By adopting the preparation method, the two-phase magnesium-lithium alloy which has the advantages of low density and high strength and can satisfy the requirement of plastic deformation at room temperature is obtained, the elongation of the two-phase magnesium-lithium alloy isgreater than or equal to 20%, and especially, the requirements of light materials with high strength and high plasticity are satisfied.

Description

technical field [0001] The invention relates to a high-strength alloy and its preparation technology, in particular to a low-density, high-strength, high-elongation magnesium-lithium alloy material, a magnesium-lithium alloy with LPSO structure strengthening obtained by self-generation and a preparation method. Background technique [0002] Due to the special advantages of magnesium-lithium alloys in mechanics, electromagnetism, and density, the alloy has great development potential and significant application advantages. It has excellent electromagnetic shielding and radiation resistance capabilities, can meet the requirements of radiation resistance from outer space rays, and may realize plastic deformation at room temperature. Therefore, magnesium-lithium alloys have become potential ideal metal structural materials in the aerospace field and can be used in electrical appliances. The instrument's frame, casing, protective cover and space dust-proof wall panels, etc., give...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/03C22F1/06
Inventor 徐春杰王弋丹马东雷宇刘帅宾孙蕾张忠明
Owner XIAN UNIV OF TECH
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