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

Abstract

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 Al 69 Ta 39 phase be stable at 1000°C. The Cr 2 Ta(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.