1. School
of Materials Science and Engineering, Key Laboratory of Mobile Materials,
MOE, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
2. School
of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
3. School of Science, Changchun University of Science and Technology, Changchun 130022, China