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Plastic deformation in polycrystals is governed by the interplay betweenintra-granular slip and grain boundary-mediated plasticity. However, while therole played by bulk dislocations is relatively well-understood, thecontribution of grain boundaries (GBs) has only recently begun to be studied.GB plasticity is known to play a key role along with bulk plasticity under awide range of conditions, such as dynamic recovery, superplasticity, severeplastic deformation , etc., and developing models capable of simultaneouslycapturing GB and bulk plasticity has become a topic of high relevance. In thispaper we develop a thermodynamically-consistent polycrystal plasticity modelcapable of simulating a variety of grain boundary-mediated plastic processes inconjunction with bulk dislocation slip. The model starts from the descriptionof a single crystal and creates lattice strain-free polycrystallineconfigurations by using a specially-designed multiplicative decompositiondeveloped by the authors. This leads to the introduction of a particular classof geometrically necessary dislocations (GND) that define fundamental GBfeatures such as misorientation and inclination. The evolution of the system isbased on an energy functional that uses a non-standard function of the GNDtensor to account for the grain boundary energy, as well as for the standardelastic energy. Our implementation builds on smooth descriptions of GBsinspired on diffuse-interface models of grain evolution for numericalconvenience. We demonstrate the generality and potential of the methodology bysimulating a wide variety of phenomena such as shear-induced GB sliding,coupled GB motion, curvature-induced grain rotation and shrinkage, andpolygonization via dislocation sub-grain formation.

A unified framework for polycrystal plasticity with grain boundary evolution