Abstract
Movement of dislocations and their interaction with grain boundaries during yielding process of metal polycrystals are numerically simulated . Simulation results show that when the size of Frank-Read source is close to grain diameter, the resolved shear stress needed to emit a dislocation loop increases sharply with decreasing grain size. This effect is introduced into the critical resolved shear stress, which is used in the continuum mechanics-based crystal plasticity analysis. Results of the analyses of polycrystal models show distinct increases of yield stress for specimens with smaller mean grain diameter. Evolution of geometrically necessary dislocations in fine- and coarse-grained polycrystals are discussed.
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