Interdiffusion within the beta-phase region of the Ni-Co-Cr-Al quaternary system

Wei, H., Zhang, H. Y., Sun, X. F., Dargusch, M. S. and Yao, X. (2010) Interdiffusion within the beta-phase region of the Ni-Co-Cr-Al quaternary system. Journal of Alloys and Compounds, 493 1-2: 507-516. doi:10.1016/j.jallcom.2009.12.146


Author Wei, H.
Zhang, H. Y.
Sun, X. F.
Dargusch, M. S.
Yao, X.
Title Interdiffusion within the beta-phase region of the Ni-Co-Cr-Al quaternary system
Formatted title
Interdiffusion within the β-phase region of the Ni–Co–Cr–Al quaternary system
Journal name Journal of Alloys and Compounds   Check publisher's open access policy
ISSN 0925-8388
1873-4669
Publication date 2010-03-18
Sub-type Article (original research)
DOI 10.1016/j.jallcom.2009.12.146
Volume 493
Issue 1-2
Start page 507
End page 516
Total pages 10
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2011
Language eng
Formatted abstract
Interdiffusion coefficients within the β-phase region of the nickel–cobalt–chromium–aluminum (Ni–Co–Cr–Al) quaternary system were estimated by square root diffusivity analysis. The obtained results indicated that the cross interdiffusion coefficients Dij (i ≠ j, i, j = Al, Cr, Co) other than DAlCo were less than the main interdiffusion coefficients Dij (i = j), and that the values of DAli were greater than those of DCri and DCoi. This finding suggests that the addition of chromium decreases the interdiffusion coefficients of aluminum and cobalt, but the addition of cobalt did not cause an obvious change in the interdiffusion coefficients of aluminum and chromium in the β-phase region. The different effects associated with the additions of chromium and cobalt were qualitatively discussed in light of the relationship between the thermodynamic properties of the system and Wagner's interaction parameter. The results revealed that the different effects could be ascribed to the stronger thermodynamic interactions between aluminum and cobalt compared to that between aluminum and chromium.
Keyword Diffusion
NiAl phase
Electron microprobe
Multicomponent diffusion couples
Square root diffusivity
Transfer matrix method
Zero flux planes
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Engineering Publications
 
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Created: Sun, 18 Apr 2010, 10:04:20 EST