Thermodynamic assessment of the Al–Mo system and of the Ti–Al–Mo System from 0 to 20 at.% Ti

A re-assessment of the thermodynamic description of the binary Al–Mo and of the ternary Ti–Al–Mo system from 0 to 20 at.%Ti was performed. The new Al–Mo description reproduces a congruent melting of the AlMo phase and the calculated phase diagram is in excellent agreement with the experimental data on the Al-rich region showing the formation of several Al-rich intermetallic phases. The new Al–Mo description was used as the constituent binary in the Ti–Al–Mo system and the thermodynamic parameters of the η, β, and δ phases were re-optimized. Calculations using the new description are in good agreement with experimental work performed in the region from 0 to 20 at.% Ti showing the extension of the β phase from the Ti–Mo binary to the Al–Mo binary, the β phase solidification of several alloys, and the transition reaction between the β, Al8Mo3, δ, and η phases at 1540 K.