On Mechanisms of 'Grain Boundary Sliding', in Light of the Kaibyshev-Valiev Data on Two Limit 'Non-Equilibrium' GB States in Deformed Metallic Materials

摘要

Based on the results of the thermodynamic analysis of a number of experimental data, and in the light of the Kaibyshev-Valiev discovery, the possibility of periodic formation of a liquidlike state in the nanoregions of extremely 'non-equilibrium' grain boundaries and in other structural defect regions in metallic polycrystals during superplastic deformation and intense plastic deformation is considered. The important differences between the liquid-like state and the glass-like (amorphous) state are also considered.