Interdiffusion analysis for NiAl versus superalloys diffusion couples |
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Authors: | E Perez T Patterson Y Sohn |
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Affiliation: | (1) Advanced Materials Processing and Analysis Center and Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, USA |
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Abstract: | Solid-to-solid diffusion couples, β-NiAl (B2) versus various commercial superalloys (i.e., CM247, GTD-111, IN-939, IN-718, and Waspalloy) were examined to quantify the
rate of Al interdiffusion as a function of initial superalloy composition. The diffusion couples were assembled with Invar
steel jig encapsulated in Ar by sealing in quartz capsules and annealed at 1050 °C for 96 h. Concentration profiles measured
by electron probe microanalysis in the single-phase β-NiAl region were used to determine interdiffusion fluxes and effective
interdiffusion coefficients of individual components in the single-phase β-NiAl side of the couple. The values determined
using experimental concentration profiles of the single-phase β-NiAl side of the couple were used to predict effective interdiffusion
coefficients in multiphase superalloy side of the couple based on mass balance and local continuity of interdiffusion fluxes.
Microstructural and compositional stability of protective coatings (e.g., NiCoCrAlY and NiAl) as a function of superalloys
composition are discussed based on effective interdiffusion coefficients predicted from diffusion couple studies.
This article was presented at the Multicomponent-Multiphase Diffusion Symposium in Honor of Mysore A. Dayananda, which was
held during TMS 2006, 135th Annual Meeting and Exhibition, March 12–16, 2006, in San Antonio, TX. The symposium was organized
by Yongho Sohn of University of Central Florida, Carelyn E. Campbell of National Institute of Standards and Technology, Richard
D. Sisson, Jr., of Worcester Polytechnic Institute, and John E. Morral of Ohio State University. |
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Keywords: | coatings diffusion coefficients interdiffusion multicomponent multiphase superalloys |
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