Grain refinement mechanism of AZ31 magnesium alloy processed by expansion-continuous shear deformation

被引：0

作者：

Che B. ^{[1
,2
]}

Lu L.-W. ^{[1
,2
]}

Xiang Y. ^{[1
,2
]}

Ma M. ^{[1
,2
]}

Luo J. ^{[3
]}

Liu L.-F. ^{[1
,2
]}

机构：

[1] School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan

[2] Hunan Provincial Overseas-wisdom Innovation Center of New Energy Vehicle in Industrial-Academic-Research Cooperation, Hunan University of Science and Technology, Xiangtan

[3] Hunan Provincial Key Laboratory of Vehicle Power and Transmission System, Hunan Institute of Engineering, Xiangtan

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2021年 / 31卷 / 12期

基金：

中国国家自然科学基金;

关键词：

AZ31 magnesium alloy; Dynamic recrystallization; Expansion-continuous shear deformation; Grain refinement;

D O I：

10.11817/j.ysxb.1004.0609.2021-40099

中图分类号：

学科分类号：

摘要：

This study proposes a new method of expansion-continuous shear deformation, and the grain refinement mechanism of AZ31 alloy was investigated with an optical microscopy and electron backscatter diffraction. Results show that AZ31 alloy can refine the grains from 150 μm to about 2.5 μm. During the expansion deformation, {1012} tensile twinning is the main deformation mechanism, which can offer numerous nucleation sites to trigger dynamic recrystallization. At the opening position, the Mg alloys have undergone large extrusion-ratio and shearing deformation, which can activation of prismatic <a> slip. Grains refinement and uniform microstructure are improved due to the basal and prismatic <a> slip. During the whole process, low-angle grain boundaries are gradually transformed into high-angle grain boundaries. Dynamic recrystallization becomes more sufficient due to the content of high-angle grain boundaries increasing from 27.6% at the position of the extrusion channel to 72.2% at the position of the channel of sheet forming. Therefore, the grain refinement mechanisms of Mg alloys are dynamic recrystallization stimulated by twinning and continuous dynamic recrystallization. © 2021, China Science Publishing & Media Ltd. All right reserved.

引用

页码：3531 / 3543

页数：12

共 26 条

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