The equilibrium between Ti and O has been investigated in molten Fe-Ti alloy saturated with various kinds of titanium oxides at 1 873 K. The present results have been thermodynamically analyzed applying Wagner's formalism as well as Darken's quadratic formalism with the excess Gibbs free energy change of mixing described by Redlich-Kister type polynomial. The equilibrium constants and the interaction parameters of Wagner's formalism were given as follows at 1 873 K in the present work. The interaction parameters of Redlich-Kister type polynomial for molten Fe-Ti-O alloy were given by the following values at 1 873 K in the present work. The estimated results based on Wagner's formalism as well as Darken's quadratic formalism polynomials were well agreed with the experimental results which were observed between Ti and O equilibrium contents in molten Fe-Ti alloy.

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The estimated results based on Wagner's formalism as well as Darken's quadratic formalism with RedlichKister type polynomials agreed well with the experimental results at 1 823 to 1 923 K.