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Deformation twinning in TiAl: Effects of defect clustering

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Abstract

Possible roles of point defect clustering in the formation of deformation twins in γ-TiAl are critically assessed by reviewing the available models of dislocation-assisted twin nucleation and experimental data on deformation twinning in Ti-56 at.% Al single crystals and two-phase Ti-47 at.% Al alloys. According to the pole mechanism for twinning in the Ll0 structure, a reasonable combination of the stress concentration (n≈r27) and the vacancy supersaturation (c/c0≈13) is needed to overcome the critical stages of twin formation. The so-called radiation-induced ductility reported in Ti-47 at.% Al alloys is attributed to the effective formation of twin embryos in the presence of interstitial-type Frank loops and the subsequent nucleation and growth of twins during plastic deformation.

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Authors and Affiliations

  1. Metals and Ceramics Division, Oak Ridge National Laboratory, 37831-6115, ak Pidge, TN, USA

    M. H. Yoo

  2. Department of Materials Science and Engineering, Japan Atomic Energy Research Institute, 319-11, Tokai, Inbaraki-ken, Japan

    A. Hishinuma

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  1. M. H. Yoo
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  2. A. Hishinuma
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Yoo, M.H., Hishinuma, A. Deformation twinning in TiAl: Effects of defect clustering. Metals and Materials 3, 65–74 (1997). https://doi.org/10.1007/BF03026128

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