Abstract
The phase equilibria in the Al-Ta-V ternary system at 1000 °C and 1200 °C have been studied by using electron probe microanalysis and x-ray diffraction. τ-Al2.9Ta2.7V1.4 phase was found in the Al-Ta-V ternary system in both isothermal sections. The addition of V stabilizes the Al69Ta39 phase at 1000 °C. The line compound Al3(V,Ta) (D022-type) forms a continuous phase region from the Al-V side to the Al-Ta side at the two temperatures. Based on our experimental results, reported liquidus projection of the ternary Al-Ta-V system and thermodynamic data of the binary systems of Al-V, Al-Ta and V-Ta, a thermodynamic evaluation of Al-Ta-V system was carried out by CALPHAD method. A set of reliable thermodynamic parameters for the Al-Ta-V system was obtained. The current calculation results agree well with the available experimental data. The invariant reaction scheme of Al-Ta-V ternary system was presented. The present study could provide essential experimental and thermodynamic data for establishing a comprehensive Co-based superalloy database.
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (Grant Number 51831007), the Shenzhen Science and Technology Program (Grant No. SGDX20210823104002016), and the Guangdong Basic and Applied Basic Research Foundation (Grant No. 2021B1515120071).
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Wang, C., Zheng, D., Zheng, Z. et al. Experimental Investigation and Thermodynamic Assessment of Phase Equilibria in the Al-Ta-V Ternary System. J. Phase Equilib. Diffus. 45, 156–174 (2024). https://doi.org/10.1007/s11669-024-01102-1
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DOI: https://doi.org/10.1007/s11669-024-01102-1