Thermodynamic assessment and the composition prediction of amorphous alloy in the Fe-B-Er alloy system

► The thermodynamic parameters of each phase in the Fe-Er and B-Er binary systems were obtained. ► An agreement between the calculated results and experimental data was obtained in each binary system. ► The liquidus surface of Fe-B-Er system has been calculated by means of CALPHAD. ► The investigation of GFA in Fe-rich alloys in the context of Fe-B-Er liquidus surface proves the significance of calculated phase diagram in the composition design of Fe-based metallic glass.