1. School of Materials Science and Engineering, Shenyang University of Technology 1 , Shenyang 110870, China
2. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University 2 , Shenyang 110819, China
3. Institute of Metal Research, Chinese Academy of Sciences 3 , Shenyang 110016, China
4. State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, Baotou Research Institute of Rare Earths 4 , Baotou 014030, China