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    • D Bradai

      Articles written in Bulletin of Materials Science

    • Volume 34 Issue 7 December 2011 pp 1471-1476

      Effect of grain boundary misorientation on discontinuous precipitation in an AZ91 alloy

      H Azzeddine S Abdessameud B Alili Z Boumerzoug D Bradai

      More Details Abstract Fulltext PDF

      A scanning electron microscopy (SEM)-based electron backscatter diffraction (EBSD) analysis showed that the discontinuous precipitation (DP) reaction rate was dependent on the geometry of the grain boundary in Mg–9Al–1Zn (wt.%) alloys. DP converted a supersaturated solid solution, 𝛿0 (magnesium (Mg)-rich solid solution), into a two-phase 𝛿 + 𝛾 aggregate, with 𝛿 being a precipitated Mg17Al12 (intermetallic phase) behind a migrating reaction front. The near-special grain boundary was rather inactive, whereas most of the random high-angle boundaries promoted the reaction. Prior deformation (hot rolling to achieve up to 80% thickness reduction) had no effect on the frequency of special-grain boundaries.

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