A thermodynamic study of liquid Cu-Cr alloys and metastable liquid immiscibility

Jacob, KT and Priya, S and Waseda, Y (2000) A thermodynamic study of liquid Cu-Cr alloys and metastable liquid immiscibility. In: Zeitschrift für Metallkunde, 91 (7). pp. 594-600.

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Abstract

he thermodynamic acitivity of chromium in liquid Cu-Cr alloys is measured in the temperature range from 1473 to 1873 K using the solid state cell: Pt, W, Cr + Cr2O3 |(Y2O3) ThO2|Cu - Cr + Cr2O3, Pt The activity of copper and the Gibbs energy of mixing of the liquid alloy are derived. Activities exhibit large positive deviations from Raoult's law. The mixing properties can be represented by a pseudo-subregular solution model in which the excess entropy has the same type of functional dependence on composition as the enthalpy of mixing: ΔGE = XCr(1 - XCr)[60880 - 18750 XCr)-- T(16.25 - 7.55 XCr)]J mol-1 Pure liquid Cu and Cr are taken as the reference states. The results predict a liquid-liquid metastable miscibility gap, with TC = 1787 (±3) K and XCr = 0.436 (±0.02), lying below the liquidus. The results obtained in this study are in general agreement with experimental information reported in the literature, but provide further refinement of the thermodynamic parameters.

Item Type:	Journal Article
Publication:	Zeitschrift für Metallkunde
Publisher:	Carl Hanser Verlag
Additional Information:	Copyright of this article belongs to Carl Hanser Verlag.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	29 Dec 2011 07:53
Last Modified:	29 Dec 2011 07:53
URI:	http://eprints.iisc.ac.in/id/eprint/42713

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