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Amorphous Ni-Zr Phase Formation in Self-Supporting Thin-Film Lateral-Diffusion Couples

Published online by Cambridge University Press:  26 February 2011

J. C. Barbour  and
J. W. Mayer
J. C. Barbour
Affiliation:
Department of Materials Science and Engineering Cornell University, Ithaca, NY 14853 USA
J. W. Mayer
Affiliation:
Department of Materials Science and Engineering Cornell University, Ithaca, NY 14853 USA
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Abstract

The formation of an amorphous Ni-Zr alloy, by heating to cause interdiffusion in the temperature range 250°C to 325°C, was demonstrated in a self-supporting lateral-diffusion couple. Micro-area diffraction in a scanning transmission electron microscope (STEM) indicates that microcrystalline ordering in the amorphous phase must be on a scale less than 5 nm. The samples were heated in a vacuum furnace to form the amorphous phase and later heated in the STEM for in situ observation of crystalline compoundformation. The amorphous to crystalline transformation occurs first in theZr-rich regions at 370°C. A crystalline phase begins to consume the Ni rich amorphous material, at 450° C; but at 325° C, the amorphous phase is stable up to 20.5 hours, even in the presence of crystalline compounds.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 57: Symposium I – Phase Transitions in Condensed Systems--Experiments and Theory , 1985 , 419
Copyright
Copyright © Materials Research Society 1987

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