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Contribution of Twinning to Low Strain Deformation in a Mg Alloy

  • Symposium: Processing-Microstructure-Property Relationships & Deformation Mechanisms of Magnesium Alloys
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Abstract

Deformation twinning plays an important role in the yielding of extruded magnesium alloys, especially when loaded in compression along the extrusion axis. The magnitude of this contribution is not accurately known. The present study employs electron backscatter diffraction to reveal the influence of grain orientation on twin-volume fraction for alloy AZ31 tested in compression to strains between 0.008 and 0.015. For these strains, it is seen that approximately 45 pct of the deformation can be attributed to “tensile” twinning. The variation of twin-volume fraction over different orientation classes correlates closely with the maximum Schmid factors for both tensile twinning and basal slip. These effects are readily explained quantitatively using a mean field crystal plasticity model without recourse to stochastic effects. Encouraged by this, we introduce an analytical approximation based on the uniformity of (axial) work.

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Acknowledgments

Thanks to Carlos Tomé for kind provision of the crystal plasticity code and for both the Deakin University Academic Study Leave Program and the Department of Materials Science of the University of Manchester for supporting the first author’s sabbatical, during which this work was carried out.

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Authors and Affiliations

  1. ARC Centre for Excellence for Design in Light Metals, Institute for Frontier Materials, Deakin University, Geelong, VIC, Australia

    Matthew R. Barnett (ARC Future Fellow and Professor of Metallurgy) & Alireza Ghaderi (Postdoctoral Research Fellow)

  2. Department of Materials Science, University of Manchester, Manchester, U.K.

    Joseph D. Robson (Reader)

Authors
  1. Matthew R. Barnett
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  2. Alireza Ghaderi
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  3. Joseph D. Robson
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Corresponding author

Correspondence to Matthew R. Barnett.

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Manuscript submitted July 12, 2013.

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Barnett, M.R., Ghaderi, A. & Robson, J.D. Contribution of Twinning to Low Strain Deformation in a Mg Alloy. Metall Mater Trans A 45, 3213–3221 (2014). https://doi.org/10.1007/s11661-013-2029-8

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  • DOI: https://doi.org/10.1007/s11661-013-2029-8

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