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Method for preparing high-strength and high-plasticity magnesium alloy with mixcrystal structure

A magnesium alloy and mixed crystal technology, which is applied in the field of preparing magnesium alloy with high-strength plastic mixed crystal structure, can solve the problems of low plasticity and limited industrial application of high-strength magnesium alloys, and achieve the goal of increasing strength, improving work hardening ability, and improving deformation ability Effect

Inactive Publication Date: 2020-10-20
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, high-strength magnesium alloys usually have low plasticity, which severely limits their industrial applications.

Method used

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  • Method for preparing high-strength and high-plasticity magnesium alloy with mixcrystal structure
  • Method for preparing high-strength and high-plasticity magnesium alloy with mixcrystal structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing a high-strength plastic mixed crystal structure magnesium alloy, characterized in that it comprises the steps of:

[0020] A. Homogenize the Mg alloy extruded plate, including: charging with the furnace, heating from room temperature to 420°C within 60min, keeping it warm for 20h, and then quenching with 30°C water; the magnesium alloy extruded The press plate includes the following components in mass percentage: Al 6.3%, Zn 0.7%, Sn 0.9%, Mn 0.3%, and the balance is Mg and unavoidable impurities.

[0021] B. The Mg alloy plate obtained in step A is subjected to equal-diameter angular extrusion; the specific operation of said equal-diameter angular extrusion is: according to the path Bc, first extrude at an extrusion temperature of 300 ° C, and the extrusion pass is 1 times; followed by holding at 250°C for 60 minutes, and then extruding at an extrusion temperature of 250°C, one extrusion pass; then holding at 250°C for 90 minutes. said B c Path...

Embodiment 2

[0025] A method for preparing a high-strength plastic mixed crystal structure magnesium alloy, characterized in that it comprises the steps of:

[0026] A. Homogenize the Mg alloy extruded plate, including: charging with the furnace, raising the temperature from room temperature to 430°C within 60min, keeping it warm for 20h, and then quenching with 30°C water; the magnesium alloy extruded The press plate includes the following components in mass percentage: Al 6.1%, Zn 0.8%, Sn 0.8%, Mn 0.2%, and the balance is Mg and unavoidable impurities.

[0027] B, the Mg alloy plate that step A obtains is carried out equal path angle extrusion; The concrete operation of described equal path angle extrusion is: press B c The path is to extrude at an extrusion temperature of 300°C for one extrusion pass; then hold at 250°C for 60 minutes, and then extrude at an extrusion temperature of 250°C for one extrusion pass; then Insulate at 250°C for 100 minutes. said B c Path: After each pass ...

Embodiment 3

[0031] A method for preparing a high-strength plastic mixed crystal structure magnesium alloy, characterized in that it comprises the steps of:

[0032] A. Homogenize the Mg alloy extruded plate, including: charging with the furnace, heating from room temperature to 440°C within 60min, keeping it warm for 21h, and then quenching with 30°C water; the magnesium alloy extruded The press plate includes the following components in mass percentage: Al 6%, Zn 0.7%, Sn 0.9%, Mn 0.3%, and the balance is Mg and unavoidable impurities.

[0033] B, the Mg alloy plate that step A obtains is carried out equal path angle extrusion; The concrete operation of described equal path angle extrusion is: press B c The path is to extrude at an extrusion temperature of 300°C for one extrusion pass; then hold at 250°C for 60 minutes, and then extrude at an extrusion temperature of 250°C for one extrusion pass; then Insulate at 250°C for 85 minutes. said B c Path: After each pass of extrusion, the s...

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Abstract

The invention discloses a method for preparing high-strength and high-plasticity magnesium alloy with a mixcrystal structure. The method comprises the following steps: A, carrying out homogenization on a magnesium alloy extruding plate to eliminate element macrosegregation in a texture so as to increase the solid solubility of the alloy elements; B, carrying out isometric angle extrusion on the magnesium alloy extruding plate obtained in the step A; and C, carrying out multi-pass cold rolling on the isometric angle extruded magnesium alloy obtained in the step B to introduce high-density dislocation. According to the preparation method, the processing procedures are short without adding a second phase, and high-strength and high-plasticity magnesium alloy can be obtained through plastic working only. Compared with a traditional texture with a fine grain structure or a coarse grain structure, the mixcrystal structure prepared through the preparation method facilitates dislocation accumulation and storage during the plastic deformation process, the phenomenon that the fine grain material is likely to generate strain local concentration during the plastic deformation process to crackuntimely is avoided, and the work hardening and plastic deformation capacity of the material are remarkably improved. The mechanical property of the magnesium alloy with a mixcrystal structure prepared through the preparation method can reach a tensile strength of 408MPa, a yield strength of 354MPa and an elongation of 10.2%.

Description

technical field [0001] The invention relates to a method for preparing a high-strength plastic mixed crystal structure magnesium alloy, which belongs to the field of magnesium alloy preparation. Background technique [0002] Magnesium alloy has the advantages of high specific strength and specific stiffness, good vibration absorption and damping performance, strong electromagnetic shielding, and easy recycling. Application prospects. However, the practical application of magnesium alloys is far less than that of aluminum alloys. The large-scale industrial application of magnesium alloys is severely limited due to the poor deformation processability of magnesium alloys at room temperature. Due to the coarse structure and poor mechanical properties of traditional cast magnesium alloys, some researchers obtained high-performance cast magnesium alloys by adding rare earth elements, and gradually formed a high-performance rare earth magnesium alloy system. However, compared wi...

Claims

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Application Information

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IPC IPC(8): C22F1/06
CPCC22F1/06C22F1/002
Inventor 徐虹张平宇国志鹏黄钰查敏王春雪邹玉杰刘猛王慧远
Owner JILIN UNIV
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