A geometrical study was made of grain-boundary sliding as stimulated by intragranular slip in a compatible bicrystal with a symmetrical 90º <10▪0> tilt boundary. By assuming that the interaction of lattice dislocations with the boundary produced glissile grain-boundary dislocations with 2 different signs, an analysis was made of the possibility of their contributing to sliding. It was shown that these grain-boundary dislocations could induce only local grain-boundary sliding and therefore could not contribute to the usual macroscopic grain-boundary sliding. It was suggested that the reason for an increase in grain-boundary sliding rate in the presence of intragranular slip was the facilitated accommodation of grain boundary sliding at boundary irregularities by the emission of lattice dislocations into the grain interior.

On the Mechanism of the Influence of Crystallographic Slip on Grain-Boundary Sliding for Similar Deformation of Grains. A.D.Sheikh-Ali, J.A.Szpunar: Philosophical Magazine Letters, 1999, 79[8], 545-9