Effect of different tensile loading modes on deformation behavior of nanocrystalline copper: Atomistic simulations

The present analysis focus on the mechanism of deformation in different tensile deformation modes. Uniaxial, plane strain and equi-biaxial tensile deformation modes play a significant role in determining the yield stress of the material. Yielding of the material begins with nucleation of 1/6<112> Shockley partial dislocation and subsequent deformation cause an increase in dislocation line length in the material. Consequently, strain hardening is observed in the RVE of nanocrystalline copper. Nucleation and propagation of dislocations and stacking faults collectively control the strain hardening behavior of the material. Distribution of atomic shear strain and dislocation is found moderately homogeneous in case of equi-biaxial tensile deformation. While the heterogeneous distribution of atomic strain and dislocation is observed in uniaxial and plane strain tensile distribution. Higher grain boundary migration is observed in uniaxial tensile deformation. Moreover, the attractive dislocation traits are noticed during dislocation and grain boundary interaction such as pinning of Shockley partial dislocation and formation of peanut like complex dislocation structure.

Abstract licence: CC BY-NC

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