Effects of 0.5 wt% Ce addition on microstructures and mechanical properties of a wrought Mg-8Gd-1.2Zn-0.5Zr alloy

被引：45
作者：
Li, Baishun [1 ,4 ]
Guan, Kai [1 ,4 ]
Yang, Qiang [1 ]
Niu, Xiaodong [1 ]
Zhang, Dongdong [1 ]
Yu, Zijian [2 ]
Zhang, Xuhu [2 ]
Tang, Zongmin [3 ]
Meng, Jian [1 ]
机构：
[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Jilin, Peoples R China
[2] Aerosp Res Inst Mat & Proc Technol, Beijing 100076, Peoples R China
[3] Hubei Prov Key Lab Adv Welding Technol, Xiaogan 432000, Peoples R China
[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 763卷
基金：
中国国家自然科学基金;
关键词：
Magnesium alloy; Transmission electron microscopy (TEM); Ce addition; Microstructure; Mechanical properties; Precipitate; ZN-ZR ALLOY; HIGH-STRENGTH; MAGNESIUM ALLOYS; HOT EXTRUSION; CORROSION PROPERTIES; CREEP RESISTANCE; HIGH-TEMPERATURE; ZK60; ALLOY; GD ALLOYS; MG;
D O I：
10.1016/j.jallcom.2018.05.308
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Effects of 0.5 wt% cerium (Ce) addition on microstructures and mechanical properties of a wrought Mg-8Gd-1.2Zn-0.5Zr alloy were thoroughly investigated in this work. The results indicate that 0.5 wt% Ce addition has slight refinement on the as-cast grains and results in a lattice expansion of the dominant intermetallic phase Mg3RE. After extrusion, 0.5 wt% Ce addition leads to higher level of recrystallization and finer dynamic recrystallization (DRX) grains and non-recrystallization stripes. In addition, there are much more dynamic precipitates on the DRX grain boundaries in the alloy with Ce addition, and the crystal structure (Mg12RE) is different from those (Mg5Gd) in the alloy with free Ce addition. Under peakaging condition, 0.5 wt% Ce addition significantly changes the precipitates in the DRX grains from basal gamma' phase to prismatic beta' phase. As a result, the as-extruded Mg-8Gd-1.2Zn-0.5Zr alloy with 0.5 wt% Ce addition owns higher strength and more obvious precipitation hardening response than the alloy with free Ce addition. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：120 / 133
页数：14
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