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\({\rm{\{}}10\bar 12{\rm{\}}}\) twins in the rolled Mg–Zn–Ca alloy with high formability

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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 \({\rm{\{}}10\bar 12{\rm{\}}}\) 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 \({\rm{\{}}10\bar 12{\rm{\}}}\) twinnability is enhanced by the addition of Ca because of the increased unstable stacking fault energy (γus) and decreased unstable twin fault energy (γut).

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Authors and Affiliations

  1. Cooperative Research Facility Center, Toyohashi University of Technology, Tempaku, Toyohashi, 441-8580, Japan

    Hiromi Nakano

  2. Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology, Moriyama, Nagoya, 463-8560, Japan

    Motohiro Yuasa & Yasumasa Chino

  3. Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University, Sakyo, Kyoto, 606-8501, Japan

    Mamoru Mabuchi

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  1. Hiromi Nakano
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  2. Motohiro Yuasa
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  4. Mamoru Mabuchi
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Correspondence to Motohiro Yuasa.

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Nakano, H., Yuasa, M., Chino, Y. et al. \({\rm{\{}}10\bar 12{\rm{\}}}\) twins in the rolled Mg–Zn–Ca alloy with high formability. Journal of Materials Research 29, 3024–3031 (2014). https://doi.org/10.1557/jmr.2014.358

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