Microstructural investigation of twins under the fracture surface in AZ31 magnesium alloys

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The present work was aimed at understanding the fracture behavior and mechanism of magnesium alloys. AZ31 magnesium alloys were deformed to failure by tensile loading at room temperature. The underlying microstructure of the fracture surface was investigated with a focused ion beam (FIB) microscope and a transmission electron microscope (TEM). The microscopic feature of the fracture surface could be classified by its morphology into three types: (1) dimples, (2) elliptic facets, and (3) severely sheared dimples. Observation of the substructure with TEM indicated the presence of {10-12} twins under the elliptic facets and the presence of {10-11}-{10-12} double twins under the severely sheared dimples. These results suggest that the localized shear deformation in the double twin become a crack initiation site. Failure occurs by the propagation of the crack along the interface of the {10-12} twins to form the elliptic faces and within grains to form the dimple feature.

Original languageEnglish
Title of host publicationLinking Science and Technology for Global Solution - Proceedings of Symposia held during TMS 2009 Annual Meeting and Exhibition
Number of pages4
Publication statusPublished - 2009
EventTMS 2009 Annual Meeting and Exhibition - San Francisco, CA, United States
Duration: 2009 Feb 162009 Feb 19

Publication series

NameTMS Annual Meeting


OtherTMS 2009 Annual Meeting and Exhibition
Country/TerritoryUnited States
CitySan Francisco, CA


  • Fracture
  • Magnesium
  • Twin

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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