Dependence of deformation mechanisms on layer spacing in multilayered Ti/Al composite

Abstract

Molecular dynamics simulations are performed to investigate the effects of layer spacing and temperature on the deformation mechanism of Ti(0001)/Al(111) multilayered composite. The results indicate that the interface rotation driven by local stress concentration dominates the plastic deformation in the sample with smaller layer thickness at both 0.01K and 300K. The confined layer slip of dislocations in Al layer is observed, while basal/prismatic interface formation and the transformation of hcp-Ti to fcc-Ti are presented in Ti layer in the samples with larger thickness at 0.01K. The results also show that the confined layer slip of dislocations and necking in Al layer is the underlying deformation mechanism in the samples with larger layer thickness at 300K. We have also presented an in-depth discussion of relative deformation mechanisms in this work.