New deformation mechanisms in fine-grain Mg alloys

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Deformation mechanisms were investigated in fine-grain (d=7 μm) AZ31 Mg alloy in order to understand their excellent room-temperature ductility. Dislocation cross slip from basal to non-basal planes was found to occur easily at room temperature at a plastic anisotropy factor of only 1.5 instead of several tens to 100 expected from the single crystal CRSS data. Enhanced grain-boundary sliding (GBS) was also found to occur at room temperature. The contribution of GBS strain was found to be approximately 8% of total strain.The enhanced activity of non-basal dislocation slip and GBS was attributed to grain-boundary compatibility effects. Moreover, dynamic recovery was found to occur during deformation at room temperature associated with the formation of recovery twins and small-angle grain boundaries. The occurrence of these deformation mechanisms at room temperature was considered to be a major reason for an excellent ductility in fine-grain Mg alloys.

Original languageEnglish
Pages (from-to)189-194
Number of pages6
JournalMaterials Science Forum
Issue numberI
Publication statusPublished - 2003
EventProceedings of the Second Osaka International Conference on Platform Science and Technology for Advanced Magnesium Alloys 2003 - Osaka, Japan
Duration: 2003 Jan 262003 Jan 30


  • Dislocations
  • Dynamic recovery
  • Grain-boundary sliding
  • Magnesium
  • Plastic anisotropy


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