Strong grain neighbour effects in polycrystals.

Nat Commun

Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK.

Published: January 2018

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.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5766582PMC
http://dx.doi.org/10.1038/s41467-017-02213-9DOI Listing

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