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$\bf\left\{ {10\bar 12} \right\}$ twins in the rolled Mg–Zn–Ca alloy with high formability

Published online by Cambridge University Press:  04 December 2014

Hiromi Nakano
Cooperative Research Facility Center, Toyohashi University of Technology, Tempaku, Toyohashi 441-8580, Japan
Motohiro Yuasa*
Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology, Moriyama, Nagoya 463-8560, Japan
Yasumasa Chino
Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology, Moriyama, Nagoya 463-8560, Japan
Mamoru Mabuchi
Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University, Sakyo, Kyoto 606-8501, Japan
a)Address all correspondence to this author. e-mail:
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Hot-rolled Mg–Zn–Ca alloy, followed by annealing, shows high formability at room temperature because of the reduced intensity of the basal texture. [Y. Chino et al., Mater. Trans. 51, 818 (2010).] In the present work, microstructures of the as-rolled Mg–Zn–Ca alloy were investigated using electron backscattered secondary diffraction and transmission electron microscopy. In addition, first-principles calculations were performed to investigate the twinnability of the Mg–Zn–Ca alloy. The microstructural investigations revealed that fine $\left\{ {10\bar 12} \right\}$ twins and local fine-grained microstructures were formed. It is therefore suggested that the fine twins induce this local fine-grained microstructure, which become the nuclei for recrystallization during annealing. As a result, the intensity of the basal texture is reduced. Calculations revealed that the $\left\{ {10\bar 12} \right\}$ twinnability is enhanced by the addition of Ca because of the increased unstable stacking fault energy (γus) and decreased unstable twin fault energy (γut).

Copyright © Materials Research Society 2014 

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