Journal
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
Volume 71, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.calphad.2020.102203
Keywords
Diffusion mobility; bcc phase; Ti-Al-Ni ternary Alloys; Ti-Ni binary; DICTRA; Phenomenological treatment
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Funding
- Defense Industrial Technology Development Program of China [JCKY2018414C020]
- Primary Research AMP
- Development Plan of Jiangsu Province [BE2019119]
- National Natural Science Foundation of China [51701094]
- Natural Science Foundation of Jiangsu Province [BK20171014]
- Priority Academic Program Development of Jiangsu Higher Education Institution (PAPD)
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The experimental diffusion coefficients of the Ti-Ni binary and Ti-Al-Ni ternary bcc phase were critically evaluated to assess the diffusion mobilities by the DICTRA-type phenomenological treatment. The calculated diffusion coefficient shows reasonable consistency with the diffusion coefficient extracted in the experiment, including the impurity and inter-diffusion coefficients in bcc Ti-Ni binary alloy and the main inter-diffusion coefficient in bcc Ti-Al-Ni ternary alloy. The difference between the calculated and experimental ternary cross coefficients is within appropriate relative errors. The predicted composition profiles and diffusion paths reasonably represent the diffusion processes that occur in Ti-Ni binary and Ti-Al-Ni ternary diffusion couples, thereby validating the mobility database assessed in the present work.
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