1. Shanxi Key Laboratory of Advanced Magnesium-based Materials, School of Materials Science and Engineering, Taiyuan University of Technology; Taiyuan 030024 P.R. China
2. School of Mechanical Engineering, Taiyuan University of Technology; Taiyuan 030024 P.R. China
3. Waikato Centre for Advanced Materials, School of Engineering, The University of Waikato; Hamilton 3204 New Zealand
4. College of Materials Science and Engineering, Beijing University of Technology; Beijing 100124 P.R. China