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A kind of preparation method of high-strength magnesium-lithium alloy and cryogenic strengthening treatment thereof

A magnesium-lithium alloy, strengthening treatment technology, applied in the preparation of magnesium-lithium alloy by cryogenic strengthening treatment, in the field of magnesium-lithium alloy, can solve the problems of low strength, low density, poor plasticity, etc., to strengthen the β-Li phase, improve The effect of alloy plasticity

Active Publication Date: 2019-09-27
铜川华铸精密科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies in the prior art, to provide a high-strength Mg-Li-Y-Zn magnesium-lithium alloy, which is by adding a certain quality of Y and Zn elements to the magnesium-lithium-based alloy, and controlling Atomic ratio of Y / Zn, ​​X-Mg with LPSO long-period stacking structure can be obtained spontaneously in the magnesium-lithium-based alloy structure through a certain heat treatment 12 YZn phase, and then undergo 77K cryogenic treatment for a certain period of time to promote the matrix α-Mg phase grains to obtain twins, further refine the grains, and promote the further dispersion and precipitation of X phase in the matrix β-Li phase, so that the alloy not only With low density and excellent mechanical properties, it solves the problems of low absolute strength and poor plasticity of existing magnesium-lithium alloys, and meets the requirements of UTS≥150MPa and δ≥20% at room temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A high-strength magnesium-lithium alloy, the composition is calculated by mass percentage, including the following components: 9.5% Li, 4% Y, 2% Zn, the total amount of impurity elements Fe, Cu and Ni brought into the raw materials should not exceed 0.02%, and the rest for Mg.

[0040] The preparation method of the cryogenic strengthening treatment of the alloy is as follows:

[0041] (1) Melting and casting

[0042] The smelting and casting processes in this step are all completed under the protection of argon gas in a vacuum resistance furnace.

[0043] The melting crucible used in the melting process is made of pure titanium, and the raw materials after surface decontamination, drying and weighing are put into the crucible in the order of pure Mg ingot, Mg-30%Y intermediate alloy, pure Zn ingot and pure Li ingot The inside is to be melted.

[0044] Evacuate to a system pressure of 0.8×10 -3 At Pa, argon gas is introduced until the pressure is 0.2 atm, repeated th...

Embodiment 2

[0055] A high-strength magnesium-lithium alloy, the composition is calculated by mass percentage, including the following components: 11% Li, 5% Y, 3% Zn, the total amount of impurity elements Fe, Cu and Ni brought into the raw materials should not exceed 0.02%, and the rest for Mg.

[0056] The preparation method of the cryogenic strengthening treatment of the alloy is as follows:

[0057] (1) Melting and casting

[0058] The smelting and casting processes in this step are all completed under the protection of argon gas in a vacuum resistance furnace.

[0059] The melting crucible used in the melting process is made of pure titanium, and the raw materials after surface decontamination, drying and weighing are put into the crucible in the order of pure Mg ingot, Mg-30%Y intermediate alloy, pure Zn ingot and pure Li ingot The inside is to be melted.

[0060] Vacuum down to a system pressure of 0.5×10 -3 At Pa, argon gas is introduced until the pressure is 0.3 atm, repeated ...

Embodiment 3

[0071] A high-strength magnesium-lithium alloy, the composition is calculated by mass percentage, including the following components: 12% Li, 6% Y, 4% Zn, the total amount of impurity elements Fe, Cu and Ni brought into the raw materials should not exceed 0.02%, and the rest for Mg.

[0072] The preparation method of the cryogenic strengthening treatment of the alloy is as follows:

[0073] (1) Melting and casting

[0074] The smelting and casting processes in this step are all completed under the protection of argon gas in a vacuum resistance furnace.

[0075] The melting crucible used in the melting process is made of pure titanium, and the raw materials after surface decontamination, drying and weighing are put into the crucible in the order of pure Mg ingot, Mg-30%Y intermediate alloy, pure Zn ingot and pure Li ingot The inside is to be melted.

[0076] Vacuum down to a system pressure of 0.2×10 -3 At Pa, argon gas is introduced until the pressure is 0.8 atm, repeated ...

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Abstract

The invention provides a high-strength magnesium-lithium alloy and a preparation method of cryogenic strengthening treatment of the high-strength magnesium-lithium alloy, and belongs to the technicalfield of high-strength alloys and preparation thereof. The high-strength magnesium-lithium alloy comprises Li, Y, Zn, unavoidable impurity elements and Mg. The atomic ratio of Y and Zn is higher than1.32. The preparation method of cryogenic strengthening treatment of the high-strength magnesium-lithium alloy comprises the steps of smelting and casting, homogenization heat treatment, 77 K cryogenic treatment, plastic forming machining and the like. According to the high-strength magnesium-lithium alloy and the preparation method of cryogenic strengthening treatment of the high-strength magnesium-lithium alloy, the Y and Zn elements are dissolved into a magnesium-lithium alloy matrix by simultaneously adding the Y and Zn elements, twin crystal refined grains are obtained in an alpha-Mg phase through homogenization heat treatment, cryogenic treatment, plastic forming machining, self-generating in a beta-Li phase is conducted to obtain an X-Mg12YZn phase of a layered LPSO structure, the effect of strengthening the beta-Li phase is achieved, and therefore the alloy is strengthened.

Description

technical field [0001] The invention relates to the technical field of high-strength alloys and their preparation, in particular to a low-density, high-strength, high-elongation magnesium-lithium alloy and a preparation method for the magnesium-lithium alloy by cryogenic strengthening treatment. Background technique [0002] In recent years, energy issues have become the focus of attention all over the world, and lightweight has become the development trend of modern vehicles and electronic industries. Add lithium element to magnesium alloy (density is 0.53g / cm 3 ) formed magnesium-lithium alloy, its alloy density is lower than the common AZ, ZK series magnesium alloy (the density of AZ, ZK series magnesium alloy is about 1.8 ~ 1.9g / cm 3 ), which has a positive effect on weight reduction. In addition to the advantages of low density, magnesium-lithium alloys also have high specific strength, specific stiffness, excellent shock resistance, good biocompatibility, and high-en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/02C22F1/06
Inventor 徐春杰王弋丹张浩马东马萌孙蕾张忠明
Owner 铜川华铸精密科技有限公司
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