Fatigue Hardening and Nucleation of Persistent Slip Bands in Copper

Ole Bøcker Pedersen, A. T. Winter

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    A study of fatigue hardening in single crystals of pure copper shows that, before saturation, stress-strain loops can display workhardening rates of about a third of the elastic shear modulus. These rates exceed tensile workhardening rates by roughly two orders of magnitude. This suggests that there is a large volume fraction of obstacles to plastic flow which are essentially non-deformable and give rise to inclusion stresses of considerable magnitude. The much lower hardening rates in cycles after saturation when persistent slip bands have formed suggest a lower volume fraction of obstacles, as is observed by transmission electron microscopy. A simple composite model involving an inclusion stress, a bowing stress and a passing, stress accounts for the workhardening rates semi-quantitatively in terms of observed dislocation microstructures. Possible implications for polycrystals are considered.
    Original languageEnglish
    JournalACTA METALLURGICA
    Volume30
    Issue number3
    Pages (from-to)711-718
    ISSN0001-6160
    DOIs
    Publication statusPublished - 1982

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