中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 32 No. 5 May 2022 |
（1. School of Mechanical and Electrical Engineering, Hunan City University, Yiyang 413002, China;
2. State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
3. College of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China）
Abstract:The influence of Mn content on the microstructure, tensile properties and strain-hardening behaviors of extruded Mg-1Gd-0.5Zn-xMn (x=0, 0.3 and 1, wt.%) alloy sheets was investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), and electron backscatter diffraction (EBSD). The results show that the completely recrystallized grain structure and the extrusion direction (ED)-titling texture are observed in all the extruded sheets. The mean grain size and weakened ED-titling texture of the extruded sheets are gradually reduced with increasing Mn content. This is primarily associated with the formation of new fine α-Mn particles by Mn addition. Tensile properties show that the addition of Mn also leads to the improvement of yield strengths, ultimate tensile strengths and elongations of the extruded Mg-1Gd-0.5Zn-xMn sheets, which is mainly due to the fine grains and α-Mn particles. In addition, the Mg-1Gd-0.5Zn-1Mn sheet has the lowest strain-hardening exponent and the best hardening capacity among all prepared Mg-1Gd-0.5Zn-xMn sheets.
Key words: Mg-Gd-Zn alloy; Mn addition; microstructure; mechanical properties
