[1] National Engineering Research Center of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming,650093, China
[2] Kunming Engineering & Research Institute of Nonferrous Metallurgy Co., Ltd., Kunming,650051, China
[3] Yunnan Provincial Key Laboratory for Nonferrous Vacuum Metallurgy, Kunming University of Science and Technology, Kunming,650093, China