Grain-resolved elastic strains in deformed copper measured by three-dimensional X-ray diffraction

Jette Oddershede, Søren Schmidt, Henning Friis Poulsen, Lawrence Margulies, J. Wright, M. Moscicki, W. Reimers, Grethe Winther

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    This X-ray diffraction study reports the grain-resolved elastic strains in about 1000 randomly oriented grains embedded in a polycrystalline copper sample. Diffraction data were collected in situ in the undeformed state and at a plastic strain of 1.5% while the sample was under tensile load. For each grain the centre-of-mass position was determined with an accuracy of 10 μm, the volume with a relative error of 20%, the orientation to 0.05° and the axial strain to 10− 4. The elastic strain along the tensile direction exhibited a grain orientation dependence with grains within 20° of carrying the largest strain. While the width of the strain distribution for all grains did not change upon plastic loading, the grain-resolved data show a significant widening of the distribution evaluated for small subsets of initially elastically similar grains. This widening appears independent of the grain orientation.
    Original languageEnglish
    JournalMaterials Characterization
    Volume62
    Issue number7
    Pages (from-to)651-660
    ISSN1044-5803
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Materials characterisation and modelling

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