The deformation mechanisms and mechanical properties of Cu/Fe multilayer during compression process

摘要

Abstract The deformation mechanisms and mechanical properties of Cu/Fe multilayer during compression process are investigated via atomistic simulations and rationalized analysis. It is found that yield stress and strain of Kurdjumov–Sachs model are lower than that of Nishiyama–Wassermann model, and lattice dislocation nucleates from periodic arrangement structures on the interface. We present that preferred slip systems are dominated not only by Schmidt factors but also by intersection line orientations of slip system on the interface, as well as angles between activated slip system of Cu layer and slip system of Fe layer. During deformation process, extended full dislocation dominates deformation behavior of Cu layer, and perfect dislocation and twinning dominate deformation behavior of Fe layer. After deformation, tetrahedral structures and point defects form on Cu side of interface and inside Fe layer, respectively. We calculate evolution curves for number of dislocation segments and interface thickness to illuminate deformation behavior.Graphic abstract