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Amorphization mechanisms of NiZr2 by ball-milling

Published online by Cambridge University Press:  31 January 2011

D. Galy
Affiliation:
Centre d'Etudes de Saclay, CEREM/Section de Recherches de Métallurgie Physique, 91191 Gif sur Yvette Cedex, France
L. Chaffron
Affiliation:
Centre d'Etudes de Saclay, CEREM/Section de Recherches de Métallurgie Physique, 91191 Gif sur Yvette Cedex, France
G. Martin
Affiliation:
Centre d'Etudes de Saclay, CEREM/Section de Recherches de Métallurgie Physique, 91191 Gif sur Yvette Cedex, France
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Abstract

The microstructure of NiZr2 in the course of amorphization by ball-milling is studied by transmission electron microscopy (TEM) and x-ray diffraction (XRD). The evolution from the initial fully crystalline alloy to a fully amorphized material is described. It is shown that prior to amorphization, the powder aggregates achieve a 100% nanocrystalline structure; the amorphous phase then appears and develops to the expense of the nanocrystalline phase. No massive chemical disordering is observed, but a small amount cannot be ruled out. It is proposed that amorphization occurs by chemical disordering at interfaces, induced by the scattering of shear waves.

Type
Articles
Copyright
Copyright © Materials Research Society 1997

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