Suppression of nanocrack generation in nanocrystalline materials under superplastic deformation
作者： I OVIDKO , A SHEINERMAN
DOI: 10.1016/J.ACTAMAT.2004.11.026
关键词:
摘要: A theoretical model is suggested which describes the suppressing effect of grain boundary diffusion on nanocrack generation in nanocrystalline materials under high strain rate superplastic deformation. In framework model, sliding intensively occurs deformed and causes storage dislocations at triple junctions boundaries. Relaxation stresses these via either or enhanced diffusional mass transfer vicinities junctions, depending material, structure deformation parameters. If former relaxation mechanism dominant, nanocracks are generated converge giving rise to brittle behavior a specimen. second suppresses thereby promotes material.
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