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Thermodynamics of Segregation in Multi-Component Alloys

Published online by Cambridge University Press:  26 February 2011

Krishan L. Luthra  and
Clyde L. Briant
Krishan L. Luthra
Affiliation:
Corporate Research and Development, General Electric Company, P.O. Box 8, Schenectady, NY 12301
Clyde L. Briant
Affiliation:
Corporate Research and Development, General Electric Company, P.O. Box 8, Schenectady, NY 12301
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Abstract

Thermodynamic equations are developed to express segregation in multicomponent alloys. These equations use concepts of excess partial free energies and activity coefficients and can be used in a wide variety of situations, including those where the segregating elements, such as sulfur, form strong chemical compounds in the bulk. A lower surface tension of the segregating element in relation to that of the alloy promotes its segregation. The segregation factor is also directly related to the activity/activity coefficient of the segregating element. The validity of our equations is checked by comparing the results of calculated segregation factors with the published values on sulfur segregation in Ni-S, Cr-S, Al-S, and Y-S alloys and on lead segregation in Pb-In and Pb-Sn alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 122: Symposium I – Interfacial Structure, Properties, and Design , 1988 , 249
Copyright
Copyright © Materials Research Society 1988

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References

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