▎ 摘　　要

In this paper, a BN-Gr-BN planar heterojunction is established, and the BN-Gr-BN planar heterojunction is used as reinforcing materials for copper-based materials. The coupling effects of defects and temperature on mechanical properties of the graphene-h-BN/copper vertically-stacked heterostructures were investigated. The results show the BN-Gr-BN heterojunction layer exerts a strengthening influence on the Young' modulus as well as the load transfer ability, thereby enhancing the stability capacity and the plasticity of composite system under axial tension. the introduce of BN-Gr-BN heterojunction layer gives rise to geometrical imperfections at interface, which in turn causes a reduction in the ultimate tensile strength and the associated facture strain. The positive effects of BN-Gr-BN heterojunction layer overpower their negative effects on the mechanical behavior of composite system. The adverse and strengthening effects induced by the BN-Gr-BN heterojunction layer are also strongly dependent of temperature. The present results can serve as a guide for diversified structure design and defect control.