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Amorphization mechanisms of NiZr2 by ball-milling

Published online by Cambridge University Press:  31 January 2011

D. Galy ,
L. Chaffron  and
G. Martin
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
Information
Journal of Materials Research , Volume 12 , Issue 3 , March 1997 , pp. 688 - 696
Copyright
Copyright © Materials Research Society 1997

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