1. College of Aerospace Engineering, Chongqing University, Chongqing 400044, PR China
2. College of Titanium & Vanadium, Panzhihua University, Panzhihua, Sichuan 617000, PR China
3. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China
4. Sichuan Vanadium&Titanium Industrial Technology Institute, Panzhihua, Sichuan 617000, PR China