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

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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,δ 0 (magnesium (Mg)-rich solid solution), into a two-phaseδ + γ aggregate, withδ 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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Authors and Affiliations

  1. Faculty of Physics, University of Sciences and Technology Houari Boumediene, BP 32 El-Alia, Bab-Ezzouar, Algiers, Algeria

    H. Azzeddine, S. Abdessameud, B. Alili & D. Bradai

  2. Department of Metallurgy, University of Biskra, B.P. 145, Biskra, 07000, Algeria

    Z. Boumerzoug

Authors
  1. H. Azzeddine
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  2. S. Abdessameud
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  3. B. Alili
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  4. Z. Boumerzoug
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  5. D. Bradai
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Correspondence to H. Azzeddine.

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Azzeddine, H., Abdessameud, S., Alili, B. et al. Effect of grain boundary misorientation on discontinuous precipitation in an AZ91 alloy. Bull Mater Sci 34, 1471–1476 (2011). https://doi.org/10.1007/s12034-011-0345-4

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  • DOI: https://doi.org/10.1007/s12034-011-0345-4

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