Nano-polycrystalline materials are characterized by a significant volume fraction of atoms which need to be viewed as residing at the grain boundaries. The characteristics of these boundaries have a considerable influence on plastic deformation of nano-materials. In order to model this influence quantitatively, two-phase finite element model was developed in which the generalized Hill potential theory for modeling the anisotropic plasticity of grain boundaries was used. The results of numerical simulations show the influence of different parameters on plastic deformation of nano-polycrystalline materials. The simulations were also used to study the grain size effect and grain size homogeneity.

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