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Thermodynamic aspects of amorphous phase formation

Published online by Cambridge University Press:  03 March 2011

N. Saunders
Affiliation:
Department of Materials Science and Engineering, University of Surrey, Guildford, Surrey, United Kingdom
A. P. Miodownik
Affiliation:
Department of Materials Science and Engineering, University of Surrey, Guildford, Surrey, United Kingdom
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Abstract

The glass-forming ability of the three alloy systems Co–Zr, Cu–Zr, and Ni–Zr has been analyzed for three distinct production routes: (1) liquid quenching, (2) vapor deposition, and (3) solidstate reaction. Using the free energy and heats of formation curves obtained from the thermodynamic characterization of the respective alloy systems, a satisfactory rationale can be obtained for amorphous phase formation by all three routes. The analysis shows that while amorphous phase formation by quenching from the high-temperature liquid is clearly dependent on factors such as quench rate and the value TG/TM, it is the low-temperature stability of the amorphous phase relative to the other crystalline structures that enables amorphous phases to be formed by both vapor deposition and solid-state reaction. The underlying free energy curves indicate the interesting possibility of a supersaturation sequence in the nucleation of an amorphous phase by solid-state reaction. The principles underlying thermodynamic characterizations are briefly discussed, and a characterization for Co–Zr is presented.

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Articles
Copyright
Copyright © Materials Research Society 1986

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