An interdiffusion study of a NiAl alloy using single-phase diffusion couples
The intermetallic compound NiAl is highly ordered at stoichiometry, even at high temperatures. Various data suggest that the interdiffusion coefficient should exhibit a minimum at this composition, yet the literature data show that the minimum interdiffusion coefficient occurred between 48 and 49 at...
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Published in | Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 31; no. 6; pp. 1519 - 1524 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
New York, NY
Springer
01.06.2000
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Subjects | |
Online Access | Get full text |
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Summary: | The intermetallic compound NiAl is highly ordered at stoichiometry, even at high temperatures. Various data suggest that the interdiffusion coefficient should exhibit a minimum at this composition, yet the literature data show that the minimum interdiffusion coefficient occurred between 48 and 49 at. pct Al. Accordingly, we have carried out diffusion-couple measurements employing single-phase NiAl wafers over the temperature interval from 700 C to 1000 C. The measured concentration profiles were analyzed in terms of the lattice mole fraction, yielding interdiffusion coefficients as a function of composition and temperature. For all the temperatures studied, the interdiffusion coefficients were found to exhibit a minimum at the stoichiometric composition, with a corresponding maximum in the activation energies obtained from the temperature dependence of the interdiffusion coefficients. (Author) |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1073-5623 1543-1940 |
DOI: | 10.1007/s11661-000-0162-7 |