Abstract
Interdiffusion in BCC phase of Ti-Al-Ni ternary system was investigated at 1473 K (1200 °C) by employing the diffusion-couple technique. The raw composition profiles resulting from interdiffusion treatment and retrieved from EMPA were first analytically represented by error function expansion (ERFEX), and the ternary interdiffusion and impurity diffusion coefficients were then extracted by the Whittle-Green and generalized Hall methods, respectively. The obtained main interdiffusion coefficients \( \tilde{D}_{\text{AlAl}}^{\text{Ti}} \) and two cross coefficients, i.e. \( \tilde{D}_{\text{AlNi}}^{\text{Ti}} \) and \( \tilde{D}_{\text{NiAl}}^{\text{Ti}} \), were found to increase with increasing composition of diffusing species, whereas the values of \( \tilde{D}_{\text{NiNi}}^{\text{Ti}} \) show no noticeable compositional dependence. The impurity diffusivities \( \tilde{D}_{{{\text{Al}}\left( {\text{Ti - Ni}} \right)}}^{*} \) and \( \tilde{D}_{{{\text{Ni}}\left( {\text{Ti - Al}} \right)}}^{*} \) increase with decreasing the Ni and Al compositions, respectively. The results imply that Al diffusion in β Ti-Al-Ni alloys would occur via an ordinary vacancy diffusion mechanism, whereas Ni diffusion, at least one order magnitude faster than Al, very likely benefits from interstitial diffusion as Fe and Co anomaly diffuse in BCC Titanium alloys.
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Acknowledgments
The authors would like to acknowledge the support by Joint Project of Industry-University-Research of Jiangsu Province (Grant no: BY2016005-02) the Synergetic Innovation Center for Advanced Materials, Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, and the International S&T Cooperation Program of China (2015DFA51430). Yanhua Guo would like to thank the support from the National Natural Science Foundation of China (No. 11647162) and Priority Academic Program Development of Jiangsu Higher Education Institution (PAPD).
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Gao, B., Gu, Y., Wu, Q. et al. Diffusion Research in BCC Ti-Al-Ni Ternary Alloys. J. Phase Equilib. Diffus. 38, 502–508 (2017). https://doi.org/10.1007/s11669-017-0544-9
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DOI: https://doi.org/10.1007/s11669-017-0544-9