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Updated: Sep 7, 2025

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Published on: June 7, 2018
All-proportional solid solution versus two-phase coexistence in the Ti-V alloy by first-principles phase field and
Kaoru Ohno1,2, Riichi Kuwahara3, Thi Nu Pham4
1Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan. ohno@ynu.ac.jp.
Abstract:
The microstructures of the Ti-V alloy are studied by purely first-principles calculations without relying on any empirical or experimental parameter. The special quasirandom structure model is employed to treat the all-proportional solid solution [Formula: see text] phase, while the first-principles phase field method or its variant is employed to treat the coexistence phases. The linearity of the calculated local free energy against the integer Ti[Formula: see text]V[Formula: see text] composition in the cluster expansion method manifests a clear evidence of the solid solution behavior. From a detailed energy comparison, our results are consistent with the experimental fact that the Ti-V alloy is an all-proportional solid solution of the [Formula: see text] phase at high temperatures and exhibits an [Formula: see text] coexistence at low temperatures. Moreover, it is found that mosaic-type microstructures may appear as a metastable phase, as observed by many experiments. The first-principles criterion for the all-proportional solid solution behavior presented in this paper is very general and can be applied to any other binary or multi-component alloys.
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