Molecular Dynamics Study of the Tensile Deformation on Aluminum nanorod

摘要

To study the deformation behavior of the nanorods and further explore the deformation difference among nanorods, nanowires and bulk materials, the uniaxial tension of aluminum nanorod under different stretching rate was conducted by the molecular dynamics method. The effect of stretching rate on the tensile deformation of nanorod was investigated by considering the variation of the energy, engineering stress, yield stress, Youngs modulus changes with the strain. Further the deformation mechanism was discussed based on the study of the snapshots of the microstructure transformaiton at different stages. It was found that, when the stretching rate is under 9.26×10~9 s~(-1), the deformation behavior of the aluminum nanorod was similar with that of aluminum nanowire and crystal at room temperature, and presents one necking fracture mechanism. We can obtain high yield strength and yield strain. However, when the strain rate exceeding 9.26×10~9 s~(-1), the nanorod fractured near the boundaries and presents two necking mechanism, which is greatly different with that of the nano-wire or bulk materials.