Quantitative evidence of crossover toward partial dislocation mediated plasticity in copper single crystalline nanowires

Yonghai Yue, Pan Liu, Qingsong Deng, Evan Ma, Ze Zhang, Xiaodong Han

    Research output: Contribution to journalArticle

    85 Citations (Scopus)

    Abstract

    In situ tensile tests of Cu single crystalline nanowires in a high-resolution transmission electron microscope reveal a novel effect of sample dimensions on plasticity mechanisms. When the single crystalline nanowire size was reduced to <∼150 nm, the normal full dislocation slip was taken over by partial dislocation mediated plasticity (PDMP). For the first time, we demonstrate this transition in a quantitative manner by assessing the relative contributions to plastic strain from PDMP and full dislocations. The crossover sample size is consistent, well within model predictions. This discovery represents yet another "sample size effect", beyond other reported influence of sample dimensions on the mechanical behavior of metals, such as dislocation starvation or source truncation, and the "smaller is stronger" trend.

    Original languageEnglish
    Pages (from-to)4045-4049
    Number of pages5
    JournalNano Letters
    Volume12
    Issue number8
    DOIs
    Publication statusPublished - 2012 Aug 8

    Keywords

    • Plasticity mechanisms
    • copper nanowire
    • in situ TEM
    • quantitative plastic contribution
    • size dependence

    ASJC Scopus subject areas

    • Bioengineering
    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanical Engineering

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