The mechanisms of grain growth of Mg alloys : A review

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

43 Scopus Citations
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  • Qinghua Chen
  • Ruinan Chen
  • Jian Su
  • Qingsong He
  • Bin Tan
  • Chao Xu
  • Xu Huang
  • Qingwei Dai

Related Research Unit(s)


Original languageEnglish
Pages (from-to)2384-2397
Journal / PublicationJournal of Magnesium and Alloys
Issue number9
Online published27 Sept 2022
Publication statusPublished - Sept 2022



Grain growth directly influences the plasticity and strength of Mg alloys. As the grain size decreases from the microscale to the nanoscale, the plasticity of Mg alloys continually increases, whereas the strength first increases and later decreases. These trends are observed because the plastic deformation mechanism changes from dislocation–twinning dominance to grain boundary dominance. In this study, the factors influencing grain growth, such as the temperature of plastic deformation/annealing, second-phase particles and solute atoms, are examined to aid effective control of the grain size. Additionally, the mechanisms of grain growth, typically induced by strain and thermal activation, are clarified. Strain-induced grain boundary migration is attributable to the difference in the strain energy stored in adjacent grains with high-density dislocations. Heat-induced grain boundary migration is driven by the difference in the energy of the grain boundary/subgrain boundary and boundary curvature. Abnormal grain growth can be induced by anisotropy of the strain energy, anisotropy of the grain boundary mobility, depinning of the second phase and high misorientation gradient.

Research Area(s)

  • Grain growth, Mechanical properties, Mg alloys, Microstructure

Citation Format(s)

The mechanisms of grain growth of Mg alloys: A review. / Chen, Qinghua; Chen, Ruinan; Su, Jian et al.
In: Journal of Magnesium and Alloys, Vol. 10, No. 9, 09.2022, p. 2384-2397.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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