On interdiffusion in the multicomponent beta-NiAl phase

Wei, H., Zhang, H. Y., Hou, G. C., Sun, X. F., Dargusch, M. S., Yao, X. and Hu, Z. Q. (2009) On interdiffusion in the multicomponent beta-NiAl phase. Journal of Alloys and Compounds, 481 1-2: 326-335. doi:10.1016/j.jallcom.2009.02.130


Author Wei, H.
Zhang, H. Y.
Hou, G. C.
Sun, X. F.
Dargusch, M. S.
Yao, X.
Hu, Z. Q.
Title On interdiffusion in the multicomponent beta-NiAl phase
Formatted title
On interdiffusion in the multicomponent β-NiAl phase

Journal name Journal of Alloys and Compounds   Check publisher's open access policy
ISSN 0925-8388
Publication date 2009-07-29
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.jallcom.2009.02.130
Open Access Status
Volume 481
Issue 1-2
Start page 326
End page 335
Total pages 10
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Language eng
Subject 09 Engineering
Abstract Diffusion coefficients of the multicomponent beta-NiAl phase at 850, 950 and 1050 degrees C have been estimated as a function of composition by means of analyzing interdiffusion fluxes from concentration profiles which are obtained from the pack-aluminizing diffusion couples. The results indicate that values of D(AlNi)(int) and D(Alco)(int) are strongly composition dependent and values of D(AlCr)(int) are slightly composition dependent. There exist significant differences in values of D(AlNi)(int) between obtained in this study and reported in the literature for the binary NiAl phase. These differences become larger as the temperature decreases. This can be explained by the variation of the thermodynamic properties of the multicomponent beta-NiAl phase, which results from the solid solution of the alloying elements present in the nickel-based superalloy. The changes in the electronic structure due to the atomic size mismatch between the solute and solvent atoms may partially be responsible for these differences. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
Formatted abstract
 Diffusion coefficients of the multicomponent β-NiAl phase at 850, 950 and 1050 °C have been estimated as a function of composition by means of analyzing interdiffusion fluxes from concentration profiles which are obtained from the pack-aluminizing diffusion couples. The results indicate that values of  and  are strongly composition dependent and values of  are slightly composition dependent. There exist significant differences in values of  between obtained in this study and reported in the literature for the binary NiAl phase. These differences become larger as the temperature decreases. This can be explained by the variation of the thermodynamic properties of the multicomponent β-NiAl phase, which results from the solid solution of the alloying elements present in the nickel-based superalloy. The changes in the electronic structure due to the atomic size mismatch between the solute and solvent atoms may partially be responsible for these differences.
Keyword Diffusion
Zero flux planes
Models
Pack diffusion coatings
electronic structure
Diffusion couples
Single phase
Bonding characteristics
Ternary systems
Self diffusion
Al system
B2 type
Coefficients
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 50501024
Institutional Status UQ
Additional Notes Available online 13 March 2009

Document type: Journal Article
Sub-type: Article (original research)
Collection: Faculty of Engineering, Architecture and Information Technology Publications
 
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Created: Thu, 03 Sep 2009, 17:50:44 EST by Mr Andrew Martlew on behalf of Faculty Of Engineering, Architecture & Info Tech