1. State Key Laboratory of Digital Manufacturing Equipment and Technology and School of Mechanical Science and Engineering; Huazhong University of Science and Technology; Wuhan 430074 Hubei P.R. China
2. State Key Laboratory of Materials Processing and Die and Mould Technology and School of Materials Science and Engineering; Huazhong University of Science and Technology; Wuhan 430074 Hubei P.R. China
3. Institute of High Energy Physics; Chinese Academy of Sciences; Beijing 100049 (P .R. China