The presentation is dedicated to one of the major topics of modern materials science: evolution and stability of granular microstructures with special emphasis of fine grained and nanocrystalline materials. This problem is considered in the light of recent theoretical studies and computer simulations which provides evidence that the kinetics of connected grain boundaries might be essentially differnt from grain boundary kinetics. This effect is most prominent for fine grained and especially nanocrystalline materials. Major attention is paid to the contribution of grain boundary junctions (triple junctions and quadruple points) to grain microstructure stabilization. The results of recent experimental investigations of grain growth in nanocrystalline materials are discussed in the framework of developed approach.

The efect of faceting on the migration of high-angle boundaries is investigated. It is shown that the steady-state motion of a faceted boundary relates to a maximum dissipation rate of free energy.

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1. Fundamentals of Thermal Stability of Granular Nanosystems
2. Pressure Effect on Grain Boundary Diffusion in Al Bicrystals