1. Ministry-Province Jointly-Constructed Cultivation Base for State Key, Laboratory of Processing for Nonferrous Metal and Featured Materials, Guangxi Zhuang Autonomous Region, Nanning 530004, P. R. China
2. School of Physical Science and Technology, Guangxi University, Nanning 530004, P. R. China
3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, P. R. China