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Use of Metastable Phase Diagrams in Rapid Solidification

Published online by Cambridge University Press:  15 February 2011

J. H. Perepezko  and
W. J. Boettinger
J. H. Perepezko
Affiliation:
Department of Metallurgical and Mineral Engineering, University of Wisconsin, Madison, WI 53706
W. J. Boettinger
Affiliation:
Metallurgy Division, National Bureau of Standards, Washington, DC 20234
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Abstract

During rapid solidification, the nucleation and/or growth of a thermodynamically stable phase may be difficult. In this case the liquidus, solidus or other thermodynamic data for a metastable phase are important for the interpretation and prediction of the phases present in rapidly solidified materials. In this paper various techniques are described to obtain information about metastable equilibrium from measured stable equilibrium data. Extrapolations of phase boundaries as functions of temperature, pressure or composition (including a new component) into regions of metastability can often be constructed directly on the equilibrium diagram. These constructions can be performed more quantitatively with analytical methods using thermodynamic modelling of the free energy functions consistent with measured data. A number of examples are considered including a discussion of metastable liquid miscibility gaps, metastable eutectic and peritectic reactions, pressure diagrams and metastability in ternary alloys to indicate the possible product phase selection. A coupling of metastable phase diagrams with a solidification kinetics analysis can contribute towards effective alloy design and processing during rapid solidification.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 19: Symposium E – Alloy Phase Diagrams , 1982 , 223
Copyright
Copyright © Materials Research Society 1983

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