1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
2. State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle, Hunan University, Changsha 410082, China
3. State Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin Institute of Technology, Harbin 150001, China
4. Department of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan