The formation and mechanical properties of amorphous copper are studied using molecular dynamics simulation.The simulations of tension and shearing show that more pronounced plasticity is found under shearing,compared to tension.Apparent strain hardening and strain rate effect are observed.Interestingly,the variations of number density of atoms during deformation indicate free volume creation,especially under higher strain rate.In particular,it is found that shear induced dilatation does appear in the amorphous metal.