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Grain boundary precipitation in Magnox AL8O

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Abstract

Grain boundary precipitates in Magnox ALSO (Mg-0.8% Al) formed after certain heat treatments have been identified as magnesium hydride, MgH2. The solvus temperature for the precipitates was found to be in the range of 300 to 350° C. Ageing at 250° C resulted in overall precipitate growth accompanied by the formation of some grain boundary cavities. Cavities were also formed when hydride precipitates were reheated to higher temperatures. The solvus temperature and the behaviour of the precipitates during ageing at 250° C and subsequent heating to higher temperatures are discussed in terms of the magnesium-hydrogen system.

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Author notes

  1. Y. P. Lin

    Present address: Department of Materials Science and Engineering, McMaster University, L8S 4LT, Hamilton, Canada

Authors and Affiliations

  1. H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, BS8 1TL, Bristol, UK

    Y. P. Lin

  2. Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, CB2 3QZ, Cambridge, UK

    G. C. Smith

Authors
  1. Y. P. Lin
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  2. G. C. Smith
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Lin, Y.P., Smith, G.C. Grain boundary precipitation in Magnox AL8O. J Mater Sci 23, 2485–2494 (1988). https://doi.org/10.1007/BF01111906

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