It was shown that the accumulation of orientational misfit dislocations on grain boundaries, and wedge disclinations on triple junctions, during high-temperature deformation gave rise to additional driving forces for grain boundary migration. Under certain conditions, this caused grain boundary splitting, and the nucleation of new grains. Expressions were obtained which described the grain growth rate, and the dependence of the mean grain size upon strain, and flow stress. Interconnections between microstructural evolution, strain hardening and softening were analyzed.

V.N.Perevezentsev: Materials Science Forum, 1996, 207-209, 541-4