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A Survey of Segregation at Interphase Boundaries in Ternary Ni-Ag-X Alloys

Published online by Cambridge University Press:  26 February 2011

G. Rao  and
P. Wynblatt
G. Rao
Affiliation:
Department of Metallurgical Engineering and Materials Science Carnegie Mellon University, Pittsburgh, PA 15213
P. Wynblatt
Affiliation:
Department of Metallurgical Engineering and Materials Science Carnegie Mellon University, Pittsburgh, PA 15213
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Abstract

This paper presents an alternative derivation of a discrete lattice regular solution model for computing the composition profile across an interphase boundary in a three component system. The model is applied to the calculation of the composition profiles across interfaces separating Ni-rich and Ag-rich phases in several Ni-Ag-X ternary systems (where X stands for Cu, Pd or Au). The results show that segregation to a (001) Ni-Ag interface is expected to be strong in the case of Cu, moderate in the case of Pd, and weak in the case of Au. It is also found that the Gibbsian interfacial excess of these segregants decreases with increasing temperature.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 205: Symposium F – Kinetics of Phase Transformations , 1990 , 369
Copyright
Copyright © Materials Research Society 1992

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