Stage IV work-hardening related to disorientations in dislocation structures

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    Abstract

    The effect of deformation-induced disorientations on the work-hardening of metals is modelled based on dislocation dynamics. Essentially, Kocks’ dislocation model describing stage III hardening is extended to stage IV by incorporation of excess dislocations related to the disorientations. Disorientations evolving from purely statistical reasons — leading to a square root dependence of the average disorientation angle on strain — affect the initial work-hardening rate (and the saturation stress) of stage III only slightly. On the other hand, deterministic contributions to the development of disorientations, as differences in the 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 and Engineering: A - Structural Materials: Properties, Microstructure and Processing
    Volume387-389
    Pages (from-to)257-261
    ISSN0921-5093
    DOIs
    Publication statusPublished - 2004
    Event13th International Conference on the Strength of Materials - Budapest, Hungary
    Duration: 25 Aug 200330 Aug 2003
    Conference number: 13

    Conference

    Conference13th International Conference on the Strength of Materials
    Number13
    CountryHungary
    CityBudapest
    Period25/08/200330/08/2003

    Keywords

    • Work-hardening
    • Stage IV
    • Disorientation
    • Dislocation
    • Modelling
    • Aluminium

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