Origin of profuse {112¯1} deformation twins in Mg-Gd alloys

Cong He, Zhiqiao Li, Dehao Kong, Xiaojun Zhao, Houwen Chen, Jian Feng Nie

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Deformation twins in Mg–Gd alloys are investigated. It is found that the dominant twinning mode switches from {101¯2} twinning to {112¯1} twinning, with an increase in the Gd concentration in Mg. Our first-principles calculations suggest that the formation of the {112¯1} twin in the Gd-rich alloy is triggered by the reduced {112¯1} twin boundary energy, which results from strain relaxation along the twin boundary. Furthermore, this twinning mode is suggestive to be activated in other Mg alloys with a high concentration of solute atoms having larger size than Mg.

Original languageEnglish
Pages (from-to)62-66
Number of pages5
JournalScripta Materialia
Publication statusPublished - 15 Jan 2021


  • Deformation twins
  • First-principles calculations
  • Mg alloys
  • Twin boundary

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