Characterization of the whiskerlike products formed by hydriding magnesium metal powders

P. J. Herley, W. Jones, Bjørn Vigeholm

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The structure of filamentary crystals produced during the hydriding of magnesium powder has been studies in detail. The needles of small dimensions (typically 0.5 μm in diameter) have been identified by electron analytical techniques to be oriented microcrystals of metallic magnesium. Their formation has been ascribed to the melting of localized aluminum impurities within the bulk magnesium to form a liquid eutectic. In the presence of sublimed magnesium vapor and hydrogen (as a carrier gas) a vapor-liquid-solid mechanism operates to produce a rapid unidirectional extension followed by a slower, two-dimensional growth. As a consequence the needle becomes broader at the tip. In addition, the tip is surmounted by a small Mg-Al eutectic aggregate
    Original languageEnglish
    JournalJournal of Applied Physics
    Volume58
    Issue number1
    Pages (from-to)292-296
    ISSN0021-8979
    DOIs
    Publication statusPublished - 1985

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