1. Qinghai Provincial Key Laboratory of New Light Alloys Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming Qinghai University Xining 810016 P. R. China
2. Hunan University Changsha 410082 P. R. China
3. Huazhong University of Science and Technology Wuhan 430074 P. R. China
4. Xinjiang University Urumqi 830046 P. R. China