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Interdiffusion Microstructure Map Topology

Published online by Cambridge University Press:  15 February 2011

J. E. Morral ,
Huimi Chen  and
Frederick Meisenkothen
J. E. Morral
Affiliation:
Department of Metallurgy and Materials Engineering, University of Connecticut, Storrs, CT 06269-3136, j.morral@uconn.edu
Huimi Chen
Affiliation:
Department of Metallurgy and Materials Engineering, University of Connecticut, Storrs, CT 06269-3136, huc95001@uconnvm.uconn.edu
Frederick Meisenkothen
Affiliation:
Department of MSE, Ohio State University, Columbus, OH 43210, meisen4@hotmail.com
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Abstract

When two alloys are placed in contact to form a diffusion couple, the microstructure that forms on heating is a function of alloy composition. This function can be illustrated on a phase diagram as an “Interdiffusion Microstructure Map” (IMM). An IMM was determined in the present work for Ni-Cr-Al diffusion couples at 1200°C. The couples consisted of one γ+γ' alloy bonded to a number of γ+β alloys. The IMM contained five fields corresponding to five different microstructures. The fields met at a five-line node, giving the map an unexpected topology. The IMM topology was deduced by considering the transition microstructures and kinetic equations that lead to the formation of interdiffusion microstructures.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 580: Symposium E – Nucleation & Growth Processes in Materials , 1999 , 41
Copyright
Copyright © Materials Research Society 2000

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