A high-performance Mg-4.9Gd-3.2Y-1.1Zn-0.5Zr alloy via multidirectional forging after analyzing its compression behavior

被引：59
作者：
Zhou, Xiaojie [1 ]
Yao, Yuan [1 ]
Zhang, Jian [1 ]
Chen, Xiaomin [1 ]
Huang, Weiying [1 ]
Pan, Jing [1 ]
Wang, Haoran [1 ]
Weng, Maopeng [1 ]
机构：
[1] Changsha Univ Sci & Technol, Hunan Prov Key Lab Intelligent Mfg Technol High P, Changsha 410114, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2021年 / 70卷 / 70期
基金：
中国国家自然科学基金;
关键词：
Mg-Gd-Y-Zn-Zr; Deformation behavior; Activation energy; Forge; Dynamic recrystallization; Mechanical properties;
D O I：
10.1016/j.jmst.2020.08.054
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A high-performance Mg-4.9Gd-3.2Y-1.1Zn-0.5 Zr alloy has been fabricated by multidirectional forging (MDF) after analyzing its compression behavior. The as-homogenized alloy exhibits a high activation energy Q of deformation (similar to 285 kJ/mol). The size of DRXed grains after compression tends to decrease as the Z-H parameter (Z) increases, showing a grain size exponent m of similar to 4.0. Lamellar LPSO phases, kinking deformation, and bimodal microstructure are detected at the relatively low compression temperature of 350 and 400 degrees C, while sufficient DRX can be achieved at 500 degrees C, accompanied by the dissolution of lamellar LPSO. According to the processing maps, MDF was successfully conducted under an appropriate condition. After peak-aged at 200 degrees C for 78 h, the MDFed billet exhibits a tensile yield strength (TYS) of 331 and 305 MPa at room temperature and 200 degrees C, respectively. The high strength mainly results from the combination of fine grains, low Schmid factor for basal slip, sufficient beta' ageing precipitates, and directionally arranged interdendritic LPSO phases, etc. This paper provides a feasible way for the fabrication of high-performance, low-RE-content, and large-scale Mg components for industrial production. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
引用
收藏
页码：156 / 167
页数：12
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