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Effect of segregated Al on $\left\{ {10\bar 12} \right\}$ and $\left\{ {10\bar 11} \right\}$ twinning in Mg

Published online by Cambridge University Press:  03 November 2015

Naoki Miyazawa ,
Takashi Yoshida ,
Motohiro Yuasa ,
Yasumasa Chino  and
Mamoru Mabuchi
Naoki Miyazawa*
Affiliation:
Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University, Kyoto 606-8501, Japan
Takashi Yoshida
Affiliation:
Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University, Kyoto 606-8501, Japan
Motohiro Yuasa
Affiliation:
Structural Materials Research Institute, National Institute of Advanced Industrial Science and Technology, Nagoya 463-8560, Japan
Yasumasa Chino
Affiliation:
Structural Materials Research Institute, National Institute of Advanced Industrial Science and Technology, Nagoya 463-8560, Japan
Mamoru Mabuchi
Affiliation:
Department of Energy Science and Technology, Graduate School of Energy Science, Kyoto University, Kyoto 606-8501, Japan
*
a)Address all correspondence to this author. e-mail: miyazawa.naoki.37c@st.kyoto-u.ac.jp
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Abstract

Molecular dynamics simulations of compression deformation of $\left[ {11\bar 20} \right]$-textured 2-dimensional polycrystalline pure Mg, Mg–0.1 at.%Al, and Mg–1.0 at.%Al models were performed at 5 and 300 K. A $\left\{ {10\bar 11} \right\}$ twin nucleated before formation of a $\left\{ {10\bar 12} \right\}$ twin in the simulations at 5 K, while a $\left\{ {10\bar 11} \right\}$ twin nucleated after formation of a $\left\{ {10\bar 12} \right\}$ twin in the simulations at 300 K. The formation of a $\left\{ {10\bar 11} \right\}$ twin was the result of the glide of pyramidal 〈c + a〉 partial dislocations of ${1 \mathord{\left/ {\vphantom {1 6}} \right. \kern-\nulldelimiterspace} 6}\left\{ {10\bar 11} \right\}\left[ {\bar 2023} \right]$. $\left\{ {10\bar 11} \right\}$ twin formation was suppressed at the sites around the Al atoms because the strong Mg–Al bond suppresses atomic shuffling. However, formation was not suppressed at the sites away from the Al atoms because the effect of strong Mg–Al bond is short range. On the other hand, because $\left\{ {10\bar 12} \right\}$ twinning requires the simultaneous glide of zonal dislocations, Al inevitably suppressed $\left\{ {10\bar 12} \right\}$ twinning.

Keywords

Mgsimulationgrain boundaries
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 23 , 14 December 2015 , pp. 3629 - 3641
Copyright
Copyright © Materials Research Society 2015 

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