The role of interface in uniaxial tensile process of nano-scale bilayer Cu/Ni

G Chen and CJ Wang and P Zhang, COMPUTATIONAL MATERIALS SCIENCE, 131, 21-27 (2017).

DOI: 10.1016/j.commatsci.2017.01.036

Uniaxial tensile processes of nano-scale bilayer Cu/Ni with coherent interface (CI) and semi-coherent interface (SCI) are simulated by molecular dynamics (MD). The results show that in the deformation processes of two kind of Cu/Ni bilayer structures, dislocations nucleate from interface and the leading dislocations slipping cross the interface cause the bilayer structures getting into plastic deformation stage. The SCI leads to the strength and strain rate sensitivity (SRS) depending on the thickness of the nano-scale bilayer Cu/Ni, because of SCI hindering the dislocations slipping. However, due to the weak barriers of CI, the dislocation can cross the interface easily, which cause the independent of strength and SRS values on thickness. (C) 2017 Elsevier B.V. All rights reserved.

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