Nanocrystalline (NC) metals are known for their high mechanical strength but poorductility. Recently, introducing a bimodal configuration containing strong small and softlarge crystalline grains has been shown an effective solution to improve the ductility ofNC copper. However, a real-time observation of the deformation details in experiments isdifficult. Moreover, implementing a full-scale molecular dynamics (MD) simulation involvinga massive number of atoms is impracticable. To resemble a bimodal configuration of NC copperusing a limited number of particles, we propose a 2-D coarse-grained model.
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