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      https://www.ias.ac.in/article/fulltext/boms/034/07/1471-1476

    • Keywords

       

      AZ91 alloy; precipitation; kinetics; GBCD; EBSD.

    • Abstract

       

      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.

    • Author Affiliations

       

      H Azzeddine1 S Abdessameud1 B Alili1 Z Boumerzoug2 D Bradai1

      1. Faculty of Physics, University of Sciences and Technology Houari Boumediene, BP 32 El-Alia, Bab-Ezzouar, Algiers, Algeria
      2. Department of Metallurgy, University of Biskra, B.P. 145, 07000, Algeria
    • Dates

       
  • Bulletin of Materials Science | News

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