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The introduction of the hierarchical structure into face-centered cubic (FCC) nanotwinned (NT) metals can improve strength without losing plasticity. In present work, molecular dynamics (MD) simulations have been performed to investigate the effect of the hierarchical structure on NT copper under tensile and shear loading by comparing the differences between the hierarchical nanotwinned (HNT) and perfect nanotwinned (PNT) specimens. The results show that the hierarchical structure will alter the twin boundaries (TBs) migration mode under shear loading. The hardening process of HNT copper is dependent on the geometric structure of the grain boundary and loading direction. There is a stress gradient and additional hardening in HNT copper under tensile loading due to the hierarchical structure. This work may shed light on the role of hierarchical structure in the multiscale structure design of NT materials.

Influence of hierarchical structure on deformation characteristics and mechanical response of nanotwinned copper