中國(guó)有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 21 No. 6 June 2011 |
TixV1-xC multiple carbide
（1. Key Laboratory of Liquid Structure and Heredity of Materials of Ministry of Education,
Shandong University, Ji’nan 250061, China;
2. School of Mechanical Engineering, Shandong University, Ji’nan 250061, China;
3. Department of Mechanical System Engineering, Kumamoto University, Kumamoto 860-8555, Japan）
Abstract:The structure, stability and elastic properties of di-transition-metal carbides TixV1-xC were investigated by using the first-principles with a pseudopotential plane-waves method. The results show that the equilibrium lattice constants of TixV1-xC show a nearly linear reduction with increasing addition of V. The elastic properties of TixV1-xC are varied by doping with V. The bulk modulus of Ti0.5V0.5C is larger than that of pure TiC, as well as Ti0.5V0.5C has the largest C44 among TixV1-xC (0≤x≤1), indicating that Ti0.5V0.5C has higher hardness than pure TiC. However, Ti0.5V0.5C presents brittleness based on the analysis of ductile/brittle behavior. The Ti0.5V0.5C carbide has the lowest formation energy, indicating that Ti0.5V0.5C is more stable than all other alloys.
Key words: elastic properties; TixV1-xC carbide; the first-principles; phase stability
