1. Key Laboratory of Automobile Materials; College of Materials Science and Engineering; Jilin University; Changchun Jilin 130025 P. R. China
2. College of Materials Science and Engineering; Taiyuan University of Science and Technology; Taiyuan Shanxi 030024 P. R. China
3. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals; Lanzhou University of Technology; Lanzhou 730050 P. R. China