Elsevier

Scripta Materialia

Volume 160, February 2019, Pages 5-8
Scripta Materialia

Regular article
Influence of precipitation on yield elongation in Mg-Zn alloys

https://doi.org/10.1016/j.scriptamat.2018.09.023Get rights and content

Abstract

The effect of precipitation on yield elongation in an extruded Mg-4.5 wt% Zn alloy is investigated. The yield plateau is shown to disappear in the presence of precipitation and it is subsequently proposed that two criteria need to be satisfied for a distinct yield plateau: (1) the initial propagation of twins is autocatalytic in that twinning in one grain should stimulate twinning in an adjacent grain; (2) the twins that initially form should display an appreciable aspect ratio. These two criteria can also explain why the yield elongation decreases with an increase in grain size and deformation temperature.

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Acknowledgments

The characterization part of the present work was carried out with the support of the Deakin Advanced Characterization Facility. The authors acknowledge financial support from the Australian Research Council Discovery Grant DP150101577 and the ACES Postgraduate Research Scholarship scheme. Steven Babaniaris is gratefully acknowledged for the help on the extrusion of the current alloy. The authors also thank Bevis Hutchinson, from SwereaKIMAB, Sweden, for his comments on editing the manuscript.

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