1. Metals and Chemistry Research Institute of China Academy of Railway Sciences BEIJING 100081, PEOPLE'S REPUBLIC OF CHINA
2. CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research Chinese Academy of Sciences SHENYANG 110016, PEOPLE'S REPUBLIC OF CHINA
3. School of Materials Science and Engineering Jiangsu University of Science and Technology ZHENJIANG 212003, PEOPLE'S REPUBLIC OF CHINA