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Pre-deformed magnesium alloy and processing method thereof

A magnesium alloy and pre-deformation technology, which is applied in the field of magnesium alloy processing, can solve the problems such as the influence of high temperature creep properties of alloys, the influence of alloy properties, and cracks.

Active Publication Date: 2021-05-18
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the deformation process, the coarse Mg at the grain boundary 17 Al 12 It is easy to form crack source and produce cracks, which will adversely affect the performance of the alloy
The age-strengthening precipitates in this alloy are Mg 17 Al 12 During the aging process, it is mainly coarse lamellar discontinuous precipitates, which are easy to become the source of cracks and have a great impact on the high temperature creep properties of the alloy, which limits the application scenarios of the alloy

Method used

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  • Pre-deformed magnesium alloy and processing method thereof
  • Pre-deformed magnesium alloy and processing method thereof
  • Pre-deformed magnesium alloy and processing method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] The magnesium alloy was prepared by water-cooled semi-continuous casting method. Pure magnesium ingot (Mg 99.9%), pure aluminum ingot (Al 99.9%), pure zinc ingot (Zn99.9%), Al-Mn master alloy and Mg-Y master alloy Smelting and pouring to obtain the as-cast structure of the magnesium alloy, the mass percentage composition of the magnesium alloy is: Al: 8.5%, Zn: 0.90%, Mn: 0.3%, Y: 0.5%, and the rest is magnesium and impurity elements that cannot be removed.

[0035] The as-cast structure is subjected to solution treatment at 380°C×12h, and the structure after solid solution is as follows: image 3 shown; then the solid solution state structure is extruded, the extrusion temperature is 400 ℃, the extrusion ratio is 16:1, the extrusion speed is 17mm / s, the structure after extrusion has obvious preferred orientation; then the extruded The compressive microstructure is compressed with a small amount of deformation (example of twinning pre-deformation process) to produce a l...

Embodiment 2

[0039] The magnesium alloy was prepared by water-cooled semi-continuous casting method. Pure magnesium ingot (Mg 99.9%), pure aluminum ingot (Al 99.9%), pure zinc ingot (Zn99.9%), Al-Mn master alloy and Mg-Y master alloy Smelting and pouring to obtain the as-cast structure of the magnesium alloy, the mass percent composition of the magnesium alloy is: Al: 9.5%, Zn: 0.45%, Mn: 0.4%, Y: 0.8%, and the rest is magnesium and impurity elements that cannot be removed.

[0040] The as-cast structure is subjected to solution treatment at 400°C×8h; then the solid solution structure is extruded at a temperature of 400°C, an extrusion ratio of 16:1, and an extrusion speed of 17mm / s. The microstructure has obvious preferred orientation; then the extruded microstructure is compressed with a small amount of deformation (an example of twinning pre-deformation process) to produce a large number of twins, the compression temperature is 80 °C, and the compressive strain is 0.15 (thickness reducti...

Embodiment 3

[0043] The magnesium alloy was prepared by water-cooled semi-continuous casting method. Pure magnesium ingot (Mg 99.9%), pure aluminum ingot (Al 99.9%), pure zinc ingot (Zn99.9%), Al-Mn master alloy and Mg-Y master alloy Smelting and pouring to obtain the as-cast structure of the magnesium alloy, the mass percent composition of the magnesium alloy is: Al: 0.91%, Zn: 0.61%, Mn: 0.15%, Y: 0.3%, and the rest is magnesium and impurity elements that cannot be removed.

[0044] The as-cast structure is subjected to solution treatment at 420°C×4h; then the solid solution structure is extruded at a temperature of 400°C, an extrusion ratio of 16:1, and an extrusion speed of 17mm / s. The microstructure has obvious preferred orientation; then the extruded microstructure is compressed with a small amount of deformation (example of twinning pre-deformation process) to produce a large number of twins, the compression temperature is 100 °C, and the compressive strain is 0.2 (thickness reductio...

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Abstract

The invention discloses a pre-deformed magnesium alloy. The pre-deformed magnesium alloy comprises the following components in percentage by mass: 8.5%-9.5% of Al, 0.45%-0.90% of Zn, 0.15%-0.4% of Mn, 0.3%-0.8% of Y and the balance of magnesium and non-removable impurity elements. The magnesium alloy is obtained after being treated by a solution treatment process, a preferred orientation processing process and a twin crystal pre-deformation process in sequence, and twin crystals exist in more than 40% of crystal grains in a microscopic structure of the magnesium alloy. The invention further relates to a processing method of the pre-deformed magnesium alloy. According to the pre-deformed magnesium alloy and the processing method thereof, by regulating and controlling the magnesium alloy structure, the magnesium alloy is subjected to creep dynamic precipitation in the high-temperature creep process, the thermal stability of the material is improved through the creep dynamic precipitation phase, the creep loading range is expanded, and the creep resistance of the material is improved; and the magnesium alloy is simple in processing process, low in equipment requirement, easy and convenient to operate, relatively low in cost and high in production efficiency. Application and popularization of the magnesium alloy have important significance.

Description

technical field [0001] The invention relates to a pre-deformed magnesium alloy and a processing method thereof, belonging to the technical field of magnesium alloy processing, and in particular to improving the high-temperature creep performance of the magnesium alloy. Background technique [0002] Magnesium alloy is an alloy composed of magnesium and other elements. Its characteristics are: low density (1.8g / cm 3 Left and right), high strength, large elastic modulus, good heat dissipation, good shock absorption, greater impact load capacity than aluminum alloy, and good corrosion resistance to organic matter and alkali. Magnesium-aluminum alloys are currently the most widely used, followed by magnesium-manganese alloys and magnesium-zinc-zirconium alloys. Mainly used in aviation, aerospace, transportation, chemical industry, rocket and other industrial sectors. AZ91 magnesium alloy is one of the most widely used commercial magnesium alloys, and its main use states are as...

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C1/03C22F1/06
CPCC22C23/02C22C1/03C22F1/06
Inventor 黄伟颖黄煌李微周立波陈荐
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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