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Grain Boundary Segregation and Precipitation Processes in Iron and Nickel Base Alloys

Published online by Cambridge University Press:  26 February 2011

Ernest L. Hall  and
Clyde L. Briant
Ernest L. Hall
Affiliation:
GE Corporate Research and Development Center, PO Box 8, Schenectady, NY 12301
Clyde L. Briant
Affiliation:
GE Corporate Research and Development Center, PO Box 8, Schenectady, NY 12301
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Abstract

In many commercial iron and nickel base alloys used in structural applications, complicated grain boundary chemistry changes can occur during the heat treatments that these materials experience during fabrication or service. These chemistry changes can be associated with the segregation of solute or impurity elements to the boundaries, or with solid state precipitation processes occurring at the boundaries. Auger electron spectroscopy and analytical electron microscopy are useful tools for the quantitative examination of these phenomena. In this paper, experimental studies of the thermodynamics and kinetics of segregation and precipitation processes at grain boundaries in Fe and Ni base alloys are reviewed. Site competition between segregants, and changes in the type of grain boundary precipitation, as a function of time and temperature of annealing are described. The interaction between segregants and precipitates at grain boundaries is considered. These results are related to changes in the macroscopic properties of the material, including corrosion resistance, ductility, and strength.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 122: Symposium I – Interfacial Structure, Properties, and Design , 1988 , 237
Copyright
Copyright © Materials Research Society 1988

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