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-Al_2.9Ta_2.7V_1.4 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.

利用电子探针微量分析和X射线衍射研究了Al-Ta-V三元体系在1000℃和1200℃下的相平衡。在两个等温段的Al-Ta-V三元体系中均发现了τ-Al _2.9 Ta _2.7 V _1.4相。添加 V 可在 1000 °C 下稳定 Al ₆₉ Ta ₃₉相。线状化合物Al ₃ (V,Ta)(D0 ₂₂型)在两个温度下形成从Al-V侧到Al-Ta侧的连续相区域。基于我们的实验结果、三元Al-Ta-V体系的液相线投影和Al-V、Al-Ta和V-Ta二元体系的热力学数据，对Al-Ta-V体系进行了热力学评估通过CALPHAD方法得出。获得了一组可靠的 Al-Ta-V 体系热力学参数。当前的计算结果与现有的实验数据非常吻合。提出了Al-Ta-V三元体系的不变反应方案。本研究可为建立综合的钴基高温合金数据库提供必要的实验和热力学数据。