1. National Key Laboratory of Science and Technology on High-Strength Structural Materials, Central South University, Changsha 410083, Hunan, P. R. China
2. School of Mathematics and Computational Science, Xiangtan University, Xiangtan 411105, Hunan, P. R. China
3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, Shanxi, P. R. China
4. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, Hunan, P. R. China