A new geometric micro-mechanism responsible for changes in the misorientation of grain boundaries in the course of superplastic deformation was proposed. According to this, the misorientation changes as a result of the motion of grain-boundary disclinations accompanied by the emission of lattice dislocation pairs. Within the framework of the proposed model, the energy characteristics of the motion of grain-boundary disclinations were calculated.

Changes in Grain Boundary Misorientation Caused by Emission of Dislocation Pairs. M.Y.Gutkin, I.A.Ovidko, N.V.Skiba: Technical Physics Letters, 2002, 28[5], 437-8