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Grain neighbour effects on twin transmission in hexagonal close-packed materials

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  • M. Arul Kumar

    (Los Alamos National Laboratory)

  • I. J. Beyerlein

    (Los Alamos National Laboratory)

  • R. J. McCabe

    (Los Alamos National Laboratory)

  • C. N. Tomé

    (Los Alamos National Laboratory)

Abstract

Materials with a hexagonal close-packed (hcp) crystal structure such as Mg, Ti and Zr are being used in the transportation, aerospace and nuclear industry, respectively. Material strength and formability are critical qualities for shaping these materials into parts and a pervasive deformation mechanism that significantly affects their formability is deformation twinning. The interaction between grain boundaries and twins has an important influence on the deformation behaviour and fracture of hcp metals. Here, statistical analysis of large data sets reveals that whether twins transmit across grain boundaries depends not only on crystallography but also strongly on the anisotropy in crystallographic slip. We show that increases in crystal plastic anisotropy enhance the probability of twin transmission by comparing the relative ease of twin transmission in hcp materials such as Mg, Zr and Ti.

Suggested Citation

  • M. Arul Kumar & I. J. Beyerlein & R. J. McCabe & C. N. Tomé, 2016. "Grain neighbour effects on twin transmission in hexagonal close-packed materials," Nature Communications, Nature, vol. 7(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13826
    DOI: 10.1038/ncomms13826
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