1. State Key Laboratory of Mechanical Transmission, College of Materials Science and Engineering, Chongqing University, Chongqing, P. R. China;
2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, P. R. China;
3. Chongqing Research Center for Advanced Materials, Chongqing Academy of Science & Technology, Chongqing, P. R. China