1. State
Key Laboratory for Powder Metallurgy, Central South University, Changsha Lushan South Road 932, 410075 P. R. China
2. Sino-Platinum Metals Co., Ltd., Kunming Institute of Precious
Metals, Kunming, People West Road 121, 650106 P. R. China
3. School of Materials Science & Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia