1. School
of Metallurgy and Environment, Central South University, 932, South Lushan Road, Changsha 410083, P. R. China
2. Department
of Civil Engineering, The University of Hong Kong, Pok Fu Lam
Road, Hong Kong
3. Powder
Metallurgy Research Institute, Central South University, 932, South Lushan Road, Changsha 410083, P. R. China