Enthalpies of a binary alloy during solidification

David R Poirier, P. Nandapurkar

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The purpose of the paper is to present a method of calculating the enthalpy of a dendritic alloy during solidification. The enthalpies of the dendritic solid and interdendritic liquid of alloys of the Pb-Sn system are evaluated, but the method could be applied to other binaries as well. The enthalpies are consistent with a recent evaluation of the thermodynamics of Pb-Sn alloys and with the redistribution of solute during dendritic solidification. Because of the heat of mixing in Pb-Sn alloys, the interdendritic liquid of hypoeutectic alloys (Pb-rich) of less than 50 wt pct Sn has enthalpies that increase as temperature decreases during solidification. For some concentrations of Sn, the enthalpy of the dendritic solid at the solid-liquid interface also increases with decreasing temperature during solidification. Of particular concern in formulating the energy equation is the fact that the heat of fusion during solidification increases as much as 80 pct for hypoeutectic alloys and decreases as much as 325 pct for hypereutectic alloys. Thus the often applied assumptions of a constant specific heat and/or a constant heat of solidification could lead to errors in numerical modeling of temperature fields for dendritic solidification processes.

Original languageEnglish (US)
Pages (from-to)3057-3061
Number of pages5
JournalMetallurgical Transactions A
Volume19 A
Issue number12
StatePublished - Dec 1988

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Binary alloys
Solidification
Enthalpy
Liquids
Specific heat
Temperature distribution
Fusion reactions
Thermodynamics
Temperature
Hot Temperature

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Enthalpies of a binary alloy during solidification. / Poirier, David R; Nandapurkar, P.

In: Metallurgical Transactions A, Vol. 19 A, No. 12, 12.1988, p. 3057-3061.

Research output: Contribution to journalArticle

Poirier, DR & Nandapurkar, P 1988, 'Enthalpies of a binary alloy during solidification', Metallurgical Transactions A, vol. 19 A, no. 12, pp. 3057-3061.
Poirier, David R ; Nandapurkar, P. / Enthalpies of a binary alloy during solidification. In: Metallurgical Transactions A. 1988 ; Vol. 19 A, No. 12. pp. 3057-3061.
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