中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 20 Special 2 July 2010 |
extruded Mg-6.5Gd-1.3Nd-0.7Y-0.3Zn alloy
（1. Key Laboratory of Automobile Materials, Ministry of Education, Jilin University, Changchun 130025, China;
2. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry,
Chinese Academy of Sciences, Changchun 130022, China;
3. Department of Mechanical Engineering, Nagaoka University of Technology, Nagaoka 940-2188, Japan）
Abstract:The Mg-6.5Gd-1.3Nd-0.7Y-0.3Zn alloy ingot and sheet were prepared by casting and hot extrusion techniques, and the microstructure, age hardening behavior and mechanical properties were investigated. The results show that the as-cast alloy mainly contains α-Mg solid solution and compounds of Mg5RE and Mg24RE5 (RE=Gd, Y and Nd) phases. The grain size is refined after hot extrusion, and the Mg5RE and Mg24RE5 compounds are broken during the extrusion process. The extruded alloy exhibits remarkable age hardening response and excellent mechanical properties in the peak-aging state. The ultimate tensile strength, yield strength and elongation are 310 MPa, 201 MPa and 5.8% at room temperature, and 173 MPa, 133 MPa and 25.0% at 300 ˚C, respectively.
Key words: Mg-Gd based alloy; extrusion; age hardening behavior; microstructure; mechanical property
