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Cryogenic treatment process for improving toughness of magnesium alloy

A cryogenic treatment and magnesium alloy technology, applied in the field of metal materials, can solve problems such as numerous process steps, low production efficiency, and not too obvious improvement of alloy plasticity, and achieve the effect of simple process method, high safety and low cost

Active Publication Date: 2018-07-27
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It mainly uses cryogenic and magnetic field coupling to weaken the basal texture of magnesium alloys to improve the plastic processing performance of magnesium alloys at room temperature. However, this invention has many process steps, the experimental temperature conditions are not easy to control, the production efficiency is low, and the plasticity of the alloy is improved. not too obvious

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  • Cryogenic treatment process for improving toughness of magnesium alloy
  • Cryogenic treatment process for improving toughness of magnesium alloy
  • Cryogenic treatment process for improving toughness of magnesium alloy

Examples

Experimental program
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Embodiment 1

[0039] A cryogenic treatment process for improving the toughness of magnesium alloys, the magnesium alloy used is AZ31, the components contained in the alloy elements and their mass percentages are Al: 2.5-3.0%, Zn: 0.7-1.3%, Mn: 0.17-0.2%, The balance is Mg; before use, the raw materials are weighed according to the components and contents of the AZ31 magnesium alloy, and the raw materials are smelted to obtain the AZ31 magnesium alloy melt.

[0040] The cryogenic treatment process of this AZ31 magnesium alloy, concrete steps are as follows:

[0041] (1) mold preheating

[0042] Preheating the mold to obtain a preheated mold, wherein the preheating temperature is 200-300°C and the preheating time is 1-2h;

[0043] (2) pouring and solidification

[0044] Pouring AZ31 magnesium alloy melt into the preheated mold, after the alloy is solidified, the AZ31 magnesium alloy after solidification is obtained; wherein, a rotating magnetic field is applied during the pouring and solidi...

Embodiment 2

[0054] A cryogenic treatment process for improving the toughness of magnesium alloys. The alloy used is AZ91. The elements contained in the alloy and their mass percentages are: Al: 8.5-9.5%, Zn: 0.45-0.91%, Mn: 0.17-0.4%, Cu: 0.01-0.025%, Ni: 0.001-0.003%, Fe: 0.003-0.006%, and the balance is Mg. Before use, the raw materials are weighed according to the components and contents of the AZ91 magnesium alloy, and the raw materials are smelted to obtain the AZ91 magnesium alloy melt.

[0055] The cryogenic treatment process of this AZ91 magnesium alloy, concrete steps are as follows:

[0056] (1) mold preheating

[0057] Preheating the mold to obtain a preheated mold, wherein the preheating temperature is 100-200°C and the preheating time is 1-2h;

[0058] (2) pouring and solidification

[0059] Pour AZ91 magnesium alloy melt into the preheated mold, after the alloy solidifies, obtain the AZ91 magnesium alloy after solidification; Wherein, all apply rotating magnetic field in ...

Embodiment 3

[0069] A cryogenic treatment process for improving the toughness of magnesium alloys, the magnesium alloy used is AZ31, the components contained in the alloy elements and their mass percentages are Al: 2.5-3.0%, Zn: 0.7-1.3%, Mn: 0.17-0.2%, The balance is Mg; before use, the raw materials are weighed according to the components and contents of the AZ31 magnesium alloy, and the raw materials are smelted to obtain the AZ31 magnesium alloy melt.

[0070] The cryogenic treatment process of this AZ31 magnesium alloy, concrete steps are as follows:

[0071] (1) mold preheating

[0072] Preheating the mold to obtain a preheated mold, wherein the preheating temperature is 300-400°C and the preheating time is 1-2h;

[0073] (2) pouring and solidification

[0074] Pour the AZ31 magnesium alloy melt into the preheated mold, and after the alloy solidifies, the solidified AZ31 magnesium alloy is obtained; wherein, no rotating magnetic field is applied during the pouring process, and a ro...

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Abstract

The invention discloses a cryogenic treatment process for improving the toughness of magnesium alloy, and belongs to the technical field of metal materials. The process comprises the following steps that (1), a die is preheated to 100-400 DEG C; (2), magnesium alloy melt is poured into the preheated die, and the alloy is solidified, wherein a rotating magnetic field with the magnetic field intensity of 0.5-5 T can be applied at the same time in the whole process, and the mode is that the magnetic field can not be applied or applied in the pouring process, and the magnetic field is applied in the solidification process; (3), the solidified magnesium alloy undergoes solution treatment, wherein the temperature of the solution treatment is 390-420 DEG C, the heat preservation time of the solution treatment is 6-48 hours; (4), the magnesium alloy subjected to the solution treatment undergoes quenching treatment; and (5), the magnesium alloy subjected to the quenching treatment is placed inliquid nitrogen to undergo cryogenic treatment to obtain the magnesium alloy, wherein the temperature of the cryogenic treatment ranges from minus 196 DEG C to minus 209 DEG C, and the time of the cryogenic treatment is 24-48 hours. According to the process, the magnesium alloy is poured under the condition of the rotating magnetic field, so that the mechanical property of the alloy is increased,and after the magnesium alloy undergoes the solution treatment and the cryogenic treatment, the toughness of the magnesium alloy is greatly improved; and the process method is simple in technologicalprocess and is beneficial to practical application.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a cryogenic treatment process for improving the toughness of magnesium alloys. Background technique [0002] Due to its high specific strength and specific stiffness, as well as good thermal conductivity and dimensional stability, magnesium alloy is generally considered to be a "green material" with development prospects. In recent years, magnesium alloys have been widely used in high-speed rail, automobile manufacturing, electronic communications and aerospace. However, due to the poor plasticity of magnesium alloys, it is particularly important to improve the toughness of magnesium alloys. [0003] Patent [CN201110041708.8] discloses a preparation method of high-strength and high-toughness magnesium alloy plate and strip, which is to dissolve the thermally deformed magnesium alloy or heat it at 400-540°C for 1-15 hours and then water-quench and cool it. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F3/02C22F1/06B22D27/02
Inventor 李润霞于宝义卞健从郑黎王冰霍春影宋丽英聂赛男
Owner SHENYANG POLYTECHNIC UNIV
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