Strong grain neighbour effects in polycrystals

Hamidreza Abdolvand (), Jonathan Wright and Angus J. Wilkinson
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Hamidreza Abdolvand: Western University
Jonathan Wright: ESRF
Angus J. Wilkinson: University of Oxford

Nature Communications, 2018, vol. 9, issue 1, 1-11

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-017-02213-9

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