1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China
3. Analytical and Testing Center, Chongqing University, Chongqing 401331, China
4. College of Physics, Chongqing University, Chongqing 401331, China