1. School
of Materials Science and Engineering, Harbin Institute of Technology at Weihai, 2 West Wenhua Road, Weihai 264209, China
2. Department
of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, Nottingham NG7 2RD, U.K.
3. United Microelect Corp. Ltd., 3 Pasir Ris Dr 12, Singapore 519528, Singapore