1. State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metal; Lanzhou University of Technology; No. 287, Langongping Road Lanzhou Gansu 730050 P. R. China
2. Key Laboratory of Nonferrous Metal Alloys and Processing; Ministry of Education; Lanzhou University of Technology; No. 287, Langongping Road Lanzhou Gansu 730050 China
3. Materials Science and Engineering Department; Lanzhou University of Technology; Lanzhou Gansu 730050 China