Thermodynamic modeling is an effective approach to accelerate the development of novel materials such as V-based alloys. The base of a reliable thermodynamic database is given by the characterization and investigation of different alloys. In a first step, a thermodynamic database was created and published in [1] based on experimental data and a phase diagram published in [2]. Although the calculated and experimental phase diagrams show a good agreement, optimization is still necessary, especially regarding the TiB + VB + V₃B₂ and the V_bcc + TiB + V₃B₂ fields, to improve the modeled database and reach a higher accuracy in the calculations. Therefore, it is necessary to gain more information about the solidification of the alloys so that the liquidus projection can be calculated with better quality.

In the present talk, the results of the experimental data, carried out to increase the reliability of the database, will be shown. Eight different alloys were studied by Differential Scanning Calorimetry (DSC) to get a deep understanding of the solidification paths in the V-Ti-B system. Further, the phases were identified by X-ray diffraction (XRD) measurements and compared to the calculated phases regarding the phase fractions. The gained information will support the optimization of the created database and lead to more accurate results in the calculations. In further steps, the database is planned to extend the already existing database of the V-Si-B system with the element Titanium.

[1] M. Yazlak, H.-J. Christ, W. Yang, G. Hasemann, M. Krüger, B. Gorr; CALPHAD; 2022; 79; 102477

[2] M. Enomoto; Journal of Phase Equilibria; 1992; 13; 641 - 644