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The use of thermodynamic models in the prediction of the glass-forming range of binary alloys

Published online by Cambridge University Press:  31 January 2011

R. B. Schwarz ,
P. Nash  and
D. Turnbull
R. B. Schwarz
Affiliation:
Center for Materials Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
P. Nash
Affiliation:
Center for Materials Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
D. Turnbull
Affiliation:
Center for Materials Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

Analytical expressions describing the various thermodynamic phases in binary systems can be derived by the CALPHAD approach, whereby the parameters in these expressions are obtained from fits to measured phase equilibrium data. Extrapolations of these models can be used to predict metastable equilibria. Different thermodynamic models proposed for the Ni–Ti and the Cu–Ti systems are used to calculate the T0 curves that are relevant to the prediction of the glass-forming range in rapidly cooled molten alloys. Although all the models give acceptable fits for the equilibrium range for which they were derived, significant differences are found for the metastable regime. The problems that need to be addressed in order to improve the extrapolations into the metastable regime are discussed. Simple thermodynamic considerations predict that the glass-forming range for rapidly quenched alloys exceeds that for amorphous alloys synthesized by isothermal solid-state interdiffusion reactions.

Type
Articles
Information
Journal of Materials Research , Volume 2 , Issue 4 , August 1987 , pp. 456 - 460
Copyright
Copyright © Materials Research Society 1987

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References

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