1. Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment; Hunan University of Science and Technology; Hunan Xiangtan 411201 P.R. China
2. School of Materials Science and Engineering; Xiangtan University; Hunan Xiangtan 411105 P.R. China
3. School of Materials Science and Engineering; Hunan University of Science and Technology; Hunan Xiangtan 411201 P.R. China
4. China Three Gorges Corporation; Chengdu Sichuan 610041 P.R. China