Flow stress anisotropy caused by geometrically necessary boundaries

N. Hansen, D. Juul Jensen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The microstructural anisotropy of deformed metal is related to the formation of geometrically necessary boundaries such as dense dislocation walls and microbands. These boundaries have a macroscopic orientation with respect to the sample axes and they can resist slip due to a high concentration of dislocations. A model has been proposed for this microstructural anisotropy based on the assumptions that (i) the average slip plane is at an angle of 45-degrees to the direction of the applied stress and that (ii) a strengthening parameter is the mean distance in the slip plane between the geometrically necessary boundaries. For different macroscopic arrangements of such boundaries, the model predictions are in good qualitative and quantitative agreement with experiments.
    Original languageEnglish
    JournalActa Metallurgica et Materialia
    Volume40
    Issue number12
    Pages (from-to)3265-3275
    ISSN0956-7151
    DOIs
    Publication statusPublished - 1992

    Keywords

    • PLASTIC ANISOTROPY
    • GRAIN SHAPE
    • ALUMINUM
    • DEFORMATION
    • STRAIN
    • MICROSTRUCTURES
    • POLYCRYSTALS
    • SHEET

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