Thermodynamic Description of the Al-Mo and Al-Fe-Mo Systems

The Al-Mo and Al-Fe-Mo systems were critically assessed using the CALPHAD technique. The solution phases (liquid, fcc and bcc) were described by a substitutional solution model. The non-stoichiometric compound AlMo 3 was described by a two-sublattice model (Al,Mo)(Al,Mo) 3 in the Al-Mo binary system and (Al,Fe,Mo)(Al,Fe,Mo) 3 in the Al-Fe-Mo ternary system. Other compounds Al 63 Mo 37 , Al 8 Mo 3 , Al 3 Mo, Al 4 Mo, Al 17 Mo 4 , Al 22 Mo 5 , Al 12 Mo and Al 5 Mo in the Al-Mo system were treated as stoichiometric compounds in the binary system and as line compounds Al m (Fe,Mo) n in the Al-Fe-Mo ternary system. The compounds μ and Fe 2 Mo in the Fe-Mo system were treated as (Al,Fe) 7 Fe 2 (Fe,Mo) 4 and (Fe,Mo) 2 (Al,Mo) in the Al-Fe-Mo system, respectively. Compounds Al 5 Fe 4 , Al 2 Fe, Al 5 Fe 2 and Al 13 Fe 4 in the Al-Fe system were treated as (Al,Fe,Mo), Al 2 (Fe,Mo), (Al,Fe) 5 (Al,Fe,Mo) 2 and (Fe,Mo) 0.235 Al 0.6275 (Al,Va) 0.1375 in the Al-Fe-Mo system, respectively. Ternary compounds τ 1 and τ 2 were treated as Al 8 (Al,Fe)Mo 3 and (Al,Fe,Mo)(Va) 3 , respectively. A set of self-consistent thermodynamic parameters of the Al-Fe-Mo system was obtained.