中国物理B ›› 2018, Vol. 27 ›› Issue (8): 86401-086401.doi: 10.1088/1674-1056/27/8/086401
• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇 下一篇
The effect of dislocations on the thermodynamic properties of Ta single crystal under high pressure by molecular dynamics simulation
Yalin Li(李亚林), Jun Cai(蔡军), Dan Mo(莫丹), Yandong Wang(王沿东)
- 1 School of Nuclear Science & Engineering, North China Electric Power University(NCEPU), Beijing 102206, China;
2 State Key Laboratory for Advanced Metal Materials, University of Science & Technology Beijing, Beijing 100083, China
The effect of dislocations on the thermodynamic properties of Ta single crystal under high pressure by molecular dynamics simulation
Yalin Li(李亚林)1, Jun Cai(蔡军)1, Dan Mo(莫丹)1, Yandong Wang(王沿东)2
- 1 School of Nuclear Science & Engineering, North China Electric Power University(NCEPU), Beijing 102206, China;
2 State Key Laboratory for Advanced Metal Materials, University of Science & Technology Beijing, Beijing 100083, China
摘要：
The thermodynamic properties of Ta metal under high pressure are studied by molecular dynamics simulation. For dislocation-free Ta crystal, all the thermodynamic properties considered are in good agreement with the results from experiments or higher level calculations. If dislocations are included in the Ta crystal, it is found that as the dislocation density increases, the hydrostatic pressure at the phase transition point of bcc→hcp and hcp→fcc decreases, while the Hugoniot temperature increases. Meanwhile, the impact pressure at the elastic-plastic transition point is found to depend on the crystallographic orientation of the pressure. As the dislocation density increases, the pressure of the elastic-plastic transition point decreases rapidly at the initial stage, then gradually decreases with the increase of the dislocation density.
中图分类号: (Equations of state of pure metals and alloys)
- 64.30.Ef