Microstructure evolution and deformation mechanism of Mg-11Gd-4Y-2Zn-0.4Zr alloy during hot torsion

被引：0

作者：

Zheng C. ^{[1
,2
]}

Cheng M. ^{[1
]}

Zhang S.-H. ^{[1
]}

机构：

[1] Institute of Metal Research, Chinese Academy of Sciences, Shenyang

[2] University of Chinese Academy of Sciences, Beijing

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2021年 / 31卷 / 05期

关键词：

Dynamic recrystallization (DRX); Hot torsion; Long period stacking ordered phase (LPSO); Mg-Gd-Y-Zn-Zr alloy; Twining;

D O I：

10.11817/j.ysxb.1004.0609.2021-36567

中图分类号：

学科分类号：

摘要：

The microstructure evolution and deformation mechanism of solution treated Mg-11Gd-4Y-2Zn-0.4Zr under hot torsion conditions were investigated by optical microscope (OM), scanning electron microscope (SEM) and electron backscatter diffraction (EBSD). The results show that the original equiaxed grains are elongated along the shear direction, and the deformation textures with shear-induced characteristics are formed as well. Under 350℃, the deformation mechanism of the alloy is dominated by basal <a> slip. In addition, the extension twins appear inside some grains and the selection of twin variants obeys to the Schmid's law. When basal <a> slip and extension twins are restrained, the kinking of LPSO phase occurs to accommodate the plastic strain. When deformed at 400℃, secondary twinning is detected, and the dynamic recrystallization noteworthy occurs at twinning boundary and kink boundary. When the deformation temperature increases to 450℃, a bimodal microstructure consisting of deformed grains and recrystallized grains is produced. Moreover, the recrystallized grains with random texture can weaken the deformed texture effectively. © 2021, Science Press. All right reserved.

引用

页码：1188 / 1202

页数：14

共 46 条

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