Microstructure and mechanical properties of Mg-Gd-Y-Zn-Zr alloy by cyclic expansion-extrusion with an asymmetrical extrusion cavity (CEE-AEC)

被引：11

作者：

Zheng, Jie ^{[1
]}

Yan, Zhaoming ^{[1
]}

Yu, Jianmin ^{[1
]}

Zhang, Zhimin ^{[1
]}

Fan, Hongzhi ^{[1
]}

Xu, Kaihua ^{[1
]}

Xue, Yong ^{[1
]}

机构：

[1] North Univ China, Sch Mat Sci & Engn, Taiyuan 030051, Shanxi, Peoples R China

来源：

MATERIALS RESEARCH EXPRESS | 2019年 / 6卷 / 10期

基金：

中国国家自然科学基金;

关键词：

Mg-Gd-Y-Zn-Zr alloy; cyclic expansion-extrusion; microstructure; mechanical property; SEVERE PLASTIC-DEFORMATION; RARE-EARTH; BEHAVIOR; TEXTURE; RESISTANCE;

D O I：

10.1088/2053-1591/ab404d

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of cyclic expansion-extrusion with an asymmetrical extrusion cavity (CEE-AEC) passes on microstructure and mechanical properties of Mg-13Gd-4Y-2Zn-0.5Zr (wt%) alloy were investigated in this research. The alloy was subjected to 1, 2 and 3 passes at 480 degrees C, 460 degrees C and 440 degrees C, respectively. Optical microscope (OM), scanning electron microscope (SEM) and electron back-scattered diffraction (EBSD) was used to study microstructure evolution with different passes. The fraction of coarse grains decline and fine dynamic recrystallization (DRX) grains increase with the CEE-AEC process pass increase. The average grain size is refined from 20 mu m to 13.6 mu m after 2 passes CEE-AEC. In addition, the average grain size drops rapidly to 1.8 mu m after 3 passes. The as-received alloy and CEE-AEC processed alloys were subjected to the tensile test at room temperature (RT). The superior mechanical properties at RT with tensile yield strength (TYS) of 348 MPa after 1 pass and fracture elongation of 8.1% can be obtained after 3 passes.

引用

页数：8

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