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Thermodynamic Properties of Liquid Fe-B and Fe-B-C Alloys

In this research, the thermodynamic properties of Fe-B master alloys were investigated by the thermochemical equilibration method for which liquid Ag was chosen as the reference melt. As the preliminary investigation, the Ag-B system was evaluated. The solubility of B in Ag (|) was measured as 0.149 and 0.305 at. % at 1,773 and 1,873 K, respectively. The activity coefficient of B at infinite dilution in Ag (|) was calculated and expressed as the free energy of B dissolution in Ag (|) for 1 mass % standard state. ∇G° (1 mass % in Ag(|)) J / mole (Eq. 1) The activities of the components of Fe-B binary alloys were clarified, and strong negative deviations were observed at both 1,773 and 1,873 K. The excess free energy, the activity coefficient of B at infinite dilution, γ° B in Fe, and self-interaction parameter of B in Fe, e Β Β in Fe , were calculated at these temperatures. Apart from the binary Fe-B system, ternary Fe-B-C alloys were also experimentally investigated at 1,873 K to reveal the effect of C. The activities of B and Fe were determined and plotted in terms of isoactivities. The solubility of C as a function of B was shown, and the interaction parameter of C on B at C saturation, e C * B in Fe , was computed as 11.8 ± 0.4 by employing the Darken's approach for concentrated solutions.