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The mixing enthalpies of ternary Cu-Fe-Co liquid alloys are studied by the calorimetric method at 1873 K and x Co = 0-0.55. Thermodynamic assessments of the Fe-Co and Cu-Fe-Co systems are carried out with the CALPHAD method. A set of self-consistent thermodynamic parameters of the phases is obtained using data on the mixing enthalpies established in this study and published information on phase transformations. Isothermal and vertical sections of the phase diagram, liquidus and solidus surfaces, and metastable miscibility gap for overcooled liquid alloys are calculated. The undercooling degrees for the metastable liquid phase separation and temperaturecomposition ranges of the formation of the supersaturated solid solutions during the liquid quenching have been assessed.