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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 ,
Motohiro Yuasa ,
Yasumasa Chino  and
Mamoru Mabuchi
Hiromi Nakano
Affiliation:
Cooperative Research Facility Center, Toyohashi University of Technology, Tempaku, Toyohashi 441-8580, Japan
Motohiro Yuasa*
Affiliation:
Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology, Moriyama, Nagoya 463-8560, Japan
Yasumasa Chino
Affiliation:
Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology, Moriyama, Nagoya 463-8560, Japan
Mamoru Mabuchi
Affiliation:
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: m-yuasa@aist.go.jp
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Abstract

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).

Keywords

Mgmicrostructuretransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 24 , 28 December 2014 , pp. 3024 - 3031
Copyright
Copyright © Materials Research Society 2014 

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References

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