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Estimating Critical Stresses Required for Twin Growth in a Magnesium Alloy

  • Symposium: Phase Transformation & Deformation in Magnesium Alloys
  • Published:
Metallurgical and Materials Transactions A Aims and scope Submit manuscript

Abstract

The aim of this study is to determine a value for the critical resolved stress for the growth of deformation twins. Loading–unloading tests are performed on extruded magnesium alloy Mg-3Al-1Zn to determine the loads under which twins begin to shrink during unloading. After conversion of the applied stress to mean resolved values, the critical stresses are seen to increase from 6 to 14 MPa as the plastic applied strain is raised from 1 to 6 pct. It is suggested that the “relaxation” dislocations generated to accommodate the twinning strain contribute to building a hard dislocation forest. The effect is analyzed by analogy with accommodation dislocations formed at non-deforming particles.

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Acknowledgments

Thanks to Professors W.B. Hutchinson and Y. Estrin for commenting on the manuscript and to David Embury, who pointed out the value of Bauschinger-type tests. Also, thanks to a Reviewer whose particularly constructive comments were helpful in correcting and refining our ideas.

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Authors and Affiliations

  1. ARC Centre of Excellence for Design in Light Metals, Institute for Frontier Materials, Deakin University, Geelong Waurn Ponds Campus, Locked Bag 20000, Geelong, VIC, 3217, Australia

    Matthew Barnett (ARC Future Fellow and Professor of Metallurgy), Mohan Setty (Research Engineer) & Filip Siska (Post-Doctoral Research Fellow)

Authors
  1. Matthew Barnett
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  2. Mohan Setty
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  3. Filip Siska
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Corresponding author

Correspondence to Matthew Barnett.

Additional information

Manuscript submitted May 9, 2012.

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Barnett, M., Setty, M. & Siska, F. Estimating Critical Stresses Required for Twin Growth in a Magnesium Alloy. Metall Mater Trans A 44, 2962–2969 (2013). https://doi.org/10.1007/s11661-012-1573-y

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  • DOI: https://doi.org/10.1007/s11661-012-1573-y

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