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Journal article

Characterization of the whiskerlike products formed by hydriding magnesium metal powders

By Herley, P. J.1; Jones, W.2; Vigeholm, Bjørn3,4

From

SUNY - The State University of New York1

University of Cambridge2

Risø National Laboratory, Risø National Laboratory for Sustainable Energy, Technical University of Denmark3

Risø National Laboratory for Sustainable Energy, Technical University of Denmark4

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

Language: English
Publisher: American Institute of Physics
Year: 1985
Pages: 292-296
ISSN: 10897550 and 00218979
Types: Journal article
DOI: 10.1063/1.335674
Keywords

CRYSTAL GROWTH CRYSTALS ELECTRON MICROSCOPY FILAMENTS HYDRIDATION IMPURITIES MAGNESIUM MgH2 POWDERS WHISKERS

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