Phase Equilibria of the Al–Cr–Ta Ternary System at 1000 and 1200 °C

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 AlTa phase be stable at 1000 °C. The CrTa(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.