Strain rate and temperature effects on tensile behavior of Ti/Al multilayered nanowire: A molecular dynamics study

In this paper, the tensile behavior of Ti/Al multilayered nanowire was investigated by molecular dynamics simulation under a large range of strain rates and temperatures. The results show that strain rate and temperature significantly affect the tensile properties of Ti/Al multilayered nanowire. The value of strain rate sensitivity (m) changes at the critical strain rate of 1 x 10(9) s(-1) above which the strength increases rapidly. Amorphization appears and dominates the plastic deformation of the nanowire above 1 x 10(9) s(-1), and a superplasticity of the nanowire is observed. A linear relationship between the strength of the nanowire and the square root of temperature (T-1/2) is founded. The surface nucleation plays a crucial role in the effects of strain rate and temperature on the microstructure evolution of the nanowire. The results in this study will enrich the exploration of Ti-based multilayered materials.