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Strong grain neighbour effects in polycrystals

Author

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  • Hamidreza Abdolvand

    (Western University
    University of Oxford)

  • Jonathan Wright

    (ESRF)

  • Angus J. Wilkinson

    (University of Oxford)

Abstract

Anisotropy in single-crystal properties of polycrystals controls both the overall response of the aggregates and patterning of local stress/strain distributions, the extremes of which govern failure processes. Improving the understanding of grain–grain interactions has important consequences for in-service performance limits. Three-dimensional synchrotron X-ray diffraction was used to study the evolution of grain-resolved stresses over many contiguous grains in Zr and Ti polycrystals deformed in situ. In a significant fraction of grains, the stress along the loading axis was found to decrease during tensile plastic flow just beyond the macroscopic yield point; this is in the absence of deformation twinning and is a surprising behaviour. It is shown that this phenomenon is controlled by the crystallographic orientation of the grain and its immediate neighbours, particularly those adjacent along the loading axis.

Suggested Citation

  • Hamidreza Abdolvand & Jonathan Wright & Angus J. Wilkinson, 2018. "Strong grain neighbour effects in polycrystals," Nature Communications, Nature, vol. 9(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-017-02213-9
    DOI: 10.1038/s41467-017-02213-9
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