Molecular dynamics simulations on crack propagation in TiZrHfNb and TiZrHfTa alloys

【作者】 李子铭； 许传龙； 田晓宝； 蒋文涛； 王清远； 范海冬；

【机构】 四川大学；

【摘要】 Refractory high-entropy alloys have exceptional mechanical performances at high temperatures and are considered as a potential candidate for high-temperature structural materials. In this work, molecular dynamics simulations were employed to study the Mode-I crack behaviors in pure Ta, pure Nb, TiZrHfTa alloy and TiZrHfNb alloy. Four cracks with different orientations were considered. The crack behaviors and plastic deformation modes at the crack tip were investigated as well as their temperature effects. Simulation results show that most of the cracks in pure metals propagate in a brittle cleavage manner, while the cracks in HEAs propagate difficultly due to the plastic deformation, such as dislocations, recrystallization and slip bands.更多还原