Comparative study on plastic deformation of nanocrystalline Al and Ni

Mao Wen, Mingwei Chen

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    2 Citations (Scopus)

    Abstract

    The tensile plastic deformation of nanocrystalline (nc) Al and Ni, with grain sizes of 13.5 and 15.5 nm, respectively, is studied by molecular dynamics simulations. The results are analyzed using common neighbor analysis to characterize grain boundaries, dislocations and twins, and atomic strains to characterize plastic deformation. It is revealed that grain boundary (GB)-mediated process occurs before dislocation activities are initiated. The plasticity inside grains is carried by full dislocations in nc Al and by partial dislocations in nc Ni. For the first time, we observe zigzag dislocation motion initiating from grain boundaries where partial dislocations nucleate on parallel planes in nc Al without cross-slip. We also observe partial dislocation cross-slip via Fleischer mechanism in nc Ni. No twin is found in the deformation process of nc Al while plenty of twins are observed in nc Ni. In general, both dislocation-mediated processes and GB sliding contribute to the global plastic deformation significantly.

    Original languageEnglish
    Pages (from-to)1631-1638
    Number of pages8
    JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
    Volume45
    Issue number3
    DOIs
    Publication statusPublished - 2014 Mar

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys

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