Investigation on the Mechanical Properties of Polycrystalline Mg Using Molecular Dynamics Simulation

Magnesium (Mg) and its composites have been widely used in different fields, but the mechanical properties deformation mechanisms of polycrystalline Mg (polyMg) at atomic scale are poorly understood. In this paper, effects grain size, temperature, strain rate on tensile polyMg explored discussed by Molecular dynamics (MD) simulation method. The calculated results showed that there exists a critical size 10 nm for polyMg. flow stress decreases with increase if average is larger than nm, which shows Hall-Petch effect, mechanism large grain-sized mainly dominated movement dislocations. When less it reverse effect decrease mode small grain-size atoms boundary. Due to more active motion as system temperature increases, material can easily reach plastic stage under loading, high temperatures. has hardening composite. Based our results, provide theoretical guidance applications metal matrix composites.