The paper considers the problem of describing high-angle boundary migration within the framework of a multilevel inelastic deformation modeling approach. The proposed method is based on the consideration of grain boundary defects (grain boundary steps) and takes into account the physical mechanism of boundary migration. Steps are formed at the intersection of edge lattice dislocations with grain boundaries. The quantitative characteristic of such steps is their height, which is determined by the scalar product of the Burgers vector of a lattice dislocation with the normal of the boundary facet plane. The grain boundary migration velocity is proportional to the difference in the height of grain boundary steps of neighboring grains. Numerical calculations are carried out to confirm most of the experimental dependences between the migration velocity and orientation of boundary facets.
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