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A kind of magnesium alloy processing method for improving high temperature creep performance

A processing method and high-temperature creep technology, applied in the field of magnesium alloy processing, can solve the problems that the alloy's high-temperature creep performance has a very large influence, limit the application scene of the alloy, and easily become a crack source. Precise control and effect of suppressing the formation of precipitates

Active Publication Date: 2021-12-17
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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  • A kind of magnesium alloy processing method for improving high temperature creep performance
  • A kind of magnesium alloy processing method for improving high temperature creep performance
  • A kind of magnesium alloy processing method for improving high temperature creep performance

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Embodiment 1

[0030] The magnesium alloy was prepared by water-cooled semi-continuous casting method, and the pure magnesium ingot (Mg 99.9%), pure aluminum ingot (Al 99.9%), pure zinc ingot (Zn 99.9%), Al-Mn master alloy and Mg-Y master alloy were smelted , the as-cast structure of the magnesium alloy is obtained by pouring. 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.

[0031] The as-cast structure was subjected to solution treatment at 380°C×12h; then the solid solution state was extruded at a temperature of 400°C, an extrusion ratio of 16:1, and an extrusion speed of 17 mm / s. The apparent quality of the magnesium alloy after extrusion is good, and the EBSD microstructure of the magnesium alloy after extrusion is as follows: figure 1 As shown, it can be seen that it has an obvious preferred orientation, and the texture strength of its 0001 base plane is 6.35; then...

Embodiment 2

[0035] The magnesium alloy was prepared by water-cooled semi-continuous casting method, and the pure magnesium ingot (Mg 99.9%), pure aluminum ingot (Al 99.9%), pure zinc ingot (Zn 99.9%), Al-Mn master alloy and Mg-Y master alloy were smelted , the as-cast structure of the magnesium alloy is obtained by pouring. The mass percentage 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.

[0036]The as-cast structure was subjected to solution treatment at 400°C×8h; then the solid solution state was extruded at a temperature of 350°C, an extrusion ratio of 8:1, and an extrusion speed of 20 mm / s. The EBSD microstructure of the magnesium alloy after Image 6 As shown, it can be seen that it has an obvious preferred orientation, and the texture strength of its 0001 base plane is 7.44; then the extruded structure is compressed with a small amount of deformation, the compression direction i...

Embodiment 3

[0039] The magnesium alloy was prepared by water-cooled semi-continuous casting method, and the pure magnesium ingot (Mg 99.9%), pure aluminum ingot (Al 99.9%), pure zinc ingot (Zn 99.9%), Al-Mn master alloy and Mg-Y master alloy were smelted , the as-cast structure of the magnesium alloy was obtained by pouring. The mass percentage composition of the magnesium alloy is: Al: 9.1%, Zn: 0.61%, Mn: 0.15%, Y: 0.3%, and the rest is magnesium and impurity elements that cannot be removed.

[0040] The as-cast structure was subjected to solution treatment at 420°C×4h; then the solid solution state was extruded at a temperature of 450°C, an extrusion ratio of 25:1, and an extrusion speed of 15 mm / s. The EBSD microstructure of the magnesium alloy after Figure 8 As shown, the extruded microstructure has obvious preferred orientation, and the texture strength of its 0001 base plane is 6.82; then the extruded microstructure is compressed with a small amount of deformation, the compression...

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Abstract

The invention discloses a magnesium alloy processing method for improving high-temperature creep performance. The mass percentage composition of the magnesium alloy is: Al: 8.5%-9.5%, Zn: 0.45%-0.90%, Mn: 0.15%-0.4%, Y : 0.3%~0.8%, the rest is magnesium and impurity elements that cannot be removed; the processing method includes the following steps: 1), carrying out solid solution treatment to magnesium alloy; 2), extruding the magnesium alloy in solid solution state, extruding The temperature is 250-350°C, the extrusion rate is 15-20mm / min, and the extrusion ratio is 8:1-25:1; 3), compress and deform the extruded magnesium alloy, and the compression direction is parallel to the extrusion direction , the compression temperature is 20℃‑100℃, the compression strain is 0.01‑0.02, and the strain rate is 1x10 ‑4 the s ‑1 -2x10 ‑4 the s ‑1 , and keep the compression deformation for more than 5min. The invention adjusts the structure of the magnesium alloy, so that the magnesium alloy undergoes creep dynamic precipitation during the high-temperature creep process, and the creep dynamic precipitation phase improves the thermal stability of the material, expands the creep loading range, and improves the creep resistance of the material .

Description

technical field [0001] The invention relates to a magnesium alloy processing method for improving high-temperature creep performance, and belongs to the technical field of magnesium alloy processing. 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-cast and aged. As-cast structure consists of α-Mg and Mg 17 Al 12 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06C22C23/02
CPCC22F1/06C22C23/02
Inventor 黄伟颖黄煌李微周小杰陈荐
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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