Diffusion and atomic mobility of BCC Ti-Al-Nb alloys: Experimental determination and computational modeling

Diffusion behavior in BCC Ti-Al-Nb ternary alloys was investigated at 1473 K by the experimental solid-state diffusion couple technique. The extraction of inter- and impurity diffusion coefficients, by the Whittle-Green and generalized Hall methods respectively, enables the diffusion properties of B...

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Bibliographic Details
Published in:Calphad 2018-09, Vol.62, p.83-91
Main Authors: Gu, Yuanyu, Fan, Fujun, Guo, Yanhua, Xu, Guanglong, Chang, Hui, Zhou, Lian, Cui, Yuwen
Format: Article
Language:English
Subjects:
Alloy development
Alloys
Atomic mobilities
BCC metals
DICTRA modeling
Diffusion
Diffusion mobility
Generalized Hall method
Interdiffusion
Niobium base alloys
Ternary alloys
Ti-Al-Nb ternary alloys
Titanium base alloys
Whittle-Green
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Summary:Diffusion behavior in BCC Ti-Al-Nb ternary alloys was investigated at 1473 K by the experimental solid-state diffusion couple technique. The extraction of inter- and impurity diffusion coefficients, by the Whittle-Green and generalized Hall methods respectively, enables the diffusion properties of BCC Ti-Al-Nb alloys to be constructed at the Ti-rich corner. The determined diffusion data, together with those from the literature, have been thoroughly evaluated and then assessed to develop the atomic mobility for the BCC Ti-Al-Nb ternary alloys. The validated mobility parameters have been applied to predict a full diffusion picture of the Ti-Al-Nb BCC alloys and interesting interdiffusion behavior of the diffusion experiments.
ISSN:0364-5916
1873-2984
DOI:10.1016/j.calphad.2018.05.008