Abstract
Abstract Quasi-nanocrystalline materials (nanostructured polycrystals with quasi-periodic grain boundaries) are defined as new-types of nanostructured materials. The specific role of quasi-periodic boundaries in plastic deformation in nanostructured polycrystals is theoretically examined. It is shown that quasi-periodic tilt boundaries in nanostructured polycrystals are capable of effectively contributing to (experimentally observed) deviations of the yield stress dependence on the grain size from the standard Hall-Petch dependence.
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