The effects of strain rate on the plastic deformation mechanism of magnesium twin interface with void were investigated by molecular dynamics simulation with embedded atomic potential.The results reveal that the main forms of plastic deformation include partial dislocation

slip band and stacking fault.The Young’s modulus is independent of strain rate

and with the increase of the strain rate

the yield stress is increased.With the strain rate increase

the number of dislocations and slip bands are increased

while the number of stacking faults is increased firstly and then decreased

meanwhile the average length of dislocation motion free travel is decreased.With the deformation applied

the dislocation source produces new dislocations continuously

which leads to the increase of dislocation density.With high strain rate

stress concentration is easy to form at grain boundary

and microcracks will occur.