Thermodynamics of interstitial-f.c.c. solutions based upon kinetic considerations

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A thermodynamic model has been developed for interstitial-f.c.c. solutions where repulsive interactions exist between interstitials. The basis for this model is an assessment of the equilibrium number of paired and unpaired interstitials by means of a dynamic balance. From this information, expressions for the internal energy and the configurational entropy as functions of the interstitial interaction energy and composition are developed. The activity of the interstitial species in solution may be thus found through the partial molar free energy of solution. Tests of the model against experimental data from the carbon-austenite and nitrogen-austenite systems show satisfactory agreement. © 1977.

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Acta Metallurgica