Copious cooling and magnetic field treating method for improving plastic processing performance of magnesium alloy

A magnetic field treatment and plastic working technology, which is applied in the field of cryogenic magnetic field treatment to improve the plastic workability of magnesium alloys and improve the plastic workability of magnesium alloys, and can solve the problems of high strain hardening index, large anisotropy and low strain hardening index, etc.

Inactive Publication Date: 2016-02-17
常熟市麻先生服饰贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the crystal structure of magnesium alloy is mainly hexagonal close-packed, the most common slip systems are a/3 Burgers vector basal slip system ({0001}) and cylindrical slip system ({1-100}), the basal slip provides 3 geometric slip systems, of which there are only 2 independent slip modes; the cylindrical slip system is difficult to start at room temperature, so the magnesium alloy The plasticity, processability and formability at medium, low temperature and room temperature are very poor, which seriously limits its application range
[0004] Therefore, people have done a lot of work on improving the room temperature plasticity of magnesium alloys. These works are mainly to obtain magnesium alloy deformed materials with weak base surface texture by adding alloy elements and changing processing methods to improve their room temperature plasticity. The application number is The patent of CN200810058278.9 provides a method for preparing a magnesium alloy plate with high room temperature plasticity by hot extrusion processing. The magnesium alloy plate is prepared by hot extrusion with an extrusion die with a special shape of the die hole. The symmetrical structure of the die hole can generate shear stress during the hot extrusion process of the magnesium alloy sheet, w

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  • Copious cooling and magnetic field treating method for improving plastic processing performance of magnesium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Select AZ31 magnesium alloy (Al3.19%, Zn0.81%, Mn0.334%, the balance is Mg) sheet material through wire cutting into a 45mm standard sheet-like tensile specimen. In order to compare and illustrate the effect of the present invention, The standard sheet-like tensile specimen was tested for tensile performance without any treatment. As Comparative Example 1, the results are as follows: elongation rate 7.5%, tensile strength 220Mpa, yield strength 160MPa; the rest of the specimens are in tension Before the extension test, a cryogenic magnetic field and tempering treatment are performed by the method of the present invention. The treatment process and the parameters used are as follows.

[0017] Firstly, the magnesium alloy sample is cooled to -145℃ with liquid nitrogen at the set cooling rate, that is, the cooling rate is 10℃ / min from room temperature to -100℃, and the temperature is cooled from -100℃ to -140℃ The cooling rate during the process is 5℃ / min, and the cooling rat...

Embodiment 2

[0020] Select AZ31 magnesium alloy (Al3.19%, Zn0.81%, Mn0.334%, the balance is Mg) sheet material through wire cutting into a 45mm standard sheet-like tensile specimen. In order to compare and illustrate the effect of the present invention, The standard sheet-like tensile specimen was tested for tensile performance without any treatment. As Comparative Example 1, the results are as follows: elongation rate 7.5%, tensile strength 220Mpa, yield strength 160MPa; the rest of the specimens are in tension Before the extension test, a cryogenic magnetic field and tempering treatment are performed by the method of the present invention. The treatment process and the parameters used are as follows.

[0021] First, the magnesium alloy sample is cooled to -160℃ with liquid nitrogen at the set cooling rate, that is, the cooling rate is 10℃ / min during the process of reducing from room temperature to -100℃, and the temperature is reduced from -100℃ to -140℃ The cooling rate during the process ...

Embodiment 3

[0024] Select AZ31 magnesium alloy (Al3.19%, Zn0.81%, Mn0.334%, the balance is Mg) sheet material through wire cutting into a 45mm standard sheet-like tensile specimen. In order to compare and illustrate the effect of the present invention, The standard sheet-like tensile specimen was tested for tensile performance without any treatment. As Comparative Example 1, the results are as follows: elongation rate 7.5%, tensile strength 220Mpa, yield strength 160MPa; the rest of the specimens are in tension Before the extension test, a cryogenic magnetic field and tempering treatment are performed by the method of the present invention. The treatment process and the parameters used are as follows.

[0025] First, the magnesium alloy sample is cooled to -190℃ with liquid nitrogen at the set cooling rate, that is, the cooling rate is 10℃ / min during the process of reducing from room temperature to -100℃, and the temperature is reduced from -100℃ to -140℃ The cooling rate during the process ...

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Abstract

The invention provides a copious cooling and magnetic field treating method for improving the plastic processing performance of magnesium alloy. A magnesium alloy sample undergoes magnetic field treatment at constant low temperature after being cooled to ultralow temperature through liquid nitrogen according to a certain cooling speed, keeps insulated for a certain period of time at the constant low temperature, is heated to tempering temperature after recovering to indoor temperature according to a certain warming speed and finally is naturally cooled to the indoor temperature with a furnace when the tempering insulation time is up. According to the invention, the indoor temperature plastic processing performance of the magnesium alloy can be improved by weakening the basal texture of the magnesium alloy through special copious cooling treatment and the magnetic field combined treatment method under the copious cooling condition, especially the copious cooling and magnetic field coupling effect. The copious cooling and magnetic field treating method has the advantages of being low in investment and remarkable in effect.

Description

Technical field [0001] The invention relates to a method for improving the plastic processing performance of a magnesium alloy, in particular to a cryogenic magnetic field treatment method for improving the plastic processing performance of a magnesium alloy, and belongs to the technical field of new material processing and preparation. Background technique [0002] Magnesium and magnesium alloys have become one of the lightest metals in the application of engineering structural materials due to their good comprehensive properties. They have low density, high specific strength, specific stiffness, and elastic modulus, heat conduction, electrical conductivity, damping and shock absorption. And the electromagnetic shielding performance is superior, and it is widely used in industrial production. [0003] Since the crystal structure of magnesium alloy is mainly hexagonal close-packed, the most common slip system is a / 3 <11-20> Basal slip system of Bai's vector ({0001} <11-20&...

Claims

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Application Information

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IPC IPC(8): C22F1/06C22F3/02
Inventor 王宏明朱弋范晓建李桂荣唐蔚
Owner 常熟市麻先生服饰贸易有限公司
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