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Plastic deformation in solids induced by external shear stress is of hugepractical interest. Presence of local crystalline order in polycrystals,consisting of many grains, distinguishes its deformation pattern from that ofamorphous materials. Despite strong anisotropy, induced by external stress, theplastic flow and the consequent deformation field show strong dynamicalheterogeneity. The distribution $P(u)$ of particle displacements ($u$) showsthree distinct regimes including a power law scaling regime at moderatedisplacements. Using a phase field simulation we show how polycrystals generatesaddle and vortex like flow patterns, which hitherto have been termed aselementary plastic events in the context of amorphous materials. Interestingly,such events here find natural explanation in terms of the underlyingdislocation dynamics. We also characterize the spatial distribution of the flowfield using Okubo-Weiss measure.

Plastic flow in a sheared polycrystalline solid using phase field model