The isothermal sections of the Al–Cr–Ta ternary system at 1000 and 1200 °C have been determined by means of electron probe microanalysis and x-ray diffraction. The results show that eleven and nine three-phase regions are determined in the isothermal sections at 1000 °C and 1200 °C, respectively. No ternary compound exists at both two isothermal sections. The addition of Cr makes the Al₆₉Ta₃₉ phase be stable at 1000 °C. The Cr₂Ta(HT) phase has a large composition range at both two isothermal sections. The experimental information obtained in the present work could be significant for alloy design and the complement of the thermodynamic database.

通过电子探针显微分析和X射线衍射测定了Al-Cr-Ta三元体系在1000和1200°C时的等温截面。结果表明，分别在1000°C和1200°C的等温区确定了11个和9个三相区域。两个等温区均不存在三元化合物。Cr的添加使Al ₆₉ Ta ₃₉相在1000°C下稳定。Cr ₂ Ta（HT）相在两个等温区均具有较大的组成范围。在当前工作中获得的实验信息对于合金设计和热力学数据库的补充可能是重要的。