Disorientations and their role on the work-hardening in stage IV

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    Abstract

    The eect of deformation-induced disorientations on work-hardening of metals is modelled by dislocation dynamics. By incorporating excess dislocations related to disori- entations, Kocks' dislocation model describing stage III hardening is extended to stage IV. Disorientations evolving from purely statistical reasons still lead to stage III behavior and a saturation of the ow stress, but deterministic contributions to the development of disorienta- tions, as dierences in activated slip systems across boundaries, cause a linear increase of the flow stress at large strains. Such a constant work-hardening rate is characteristic for stage IV.
    Original languageEnglish
    JournalMaterials Science Forum
    Volume482
    Pages (from-to)155-158
    ISSN0255-5476
    DOIs
    Publication statusPublished - 2005
    Event4. International conference on materials structure and micromechanics of fracture - Brno (CZ), 23-25 Jun
    Duration: 1 Jan 2004 → …

    Conference

    Conference4. International conference on materials structure and micromechanics of fracture
    CityBrno (CZ), 23-25 Jun
    Period01/01/2004 → …

    Keywords

    • Dislocation Dynamics
    • Disorientation
    • Modeling
    • Stage IV
    • Work-Hardening

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