A coupling crack blunting mechanism in nanocrystalline materials by nano-grain rotation and shear-coupled migration of grain boundaries

Jianjun Li, Ai Kah Soh, Shaohua Chen

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    Abstract

    A theoretical model has been developed to investigate the effect of a special cooperative process between two main modes of stress-driven nano-grain growth, i.e., nano-grain rotation and shear-coupled migration of grain boundaries, on the emission of lattice dislocations from a semi-infinite crack in nanocrystalline materials. The results obtained show that the above-mentioned collaborative process is highly conducive to the process of dislocation emission, thus, rendering strong crack blunting in nanocrystalline materials.
    Original languageEnglish
    Pages (from-to)218-220
    Number of pages3
    JournalMaterials Letters
    Volume137
    DOIs
    Publication statusPublished - 15 Dec 2014

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