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The effect of grain size on deformation twinning in a textured zinc alloy

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Abstract

The incidence of deformation twinning in samples of a commercial rolled zinc-0.1% aluminium-0.05 wt % magnesium alloy has been measured at room temperature as a function of strain, grain size and direction of loading relative to the rolling direction. The volume fraction of twinned material has been measured at the surface and in the bulk. It is shown that this volume fraction is a linear function of both strain and grain size in most cases. Bands of heavily twinned grains are found to form inhomogeneously across the gauge length of tensile specimens, by an autocatalytic mechanism. Several examples are given of the interaction of twins and slip bands at grain boundaries which illustrate the formation and the accommodation of twins. The smaller volume fraction of twins found at the surface compared with the bulk reflects a relaxation of Von Mises criterion.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Science, University of Cambridge, Cambridge, UK

    Nicola Ecob & Brian Ralph

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  1. Nicola Ecob
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  2. Brian Ralph
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Ecob, N., Ralph, B. The effect of grain size on deformation twinning in a textured zinc alloy. J Mater Sci 18, 2419–2429 (1983). https://doi.org/10.1007/BF00541848

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  • DOI: https://doi.org/10.1007/BF00541848

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