Abstract
The presented paper proposes an extension of the thermodynamic solution model by Tanaka et al. which enables us to predict the activity coefficients of solute elements for infinite dilution in solid phase. This method integrates the calculation of partial enthalpy of mixing by Miedema's semi-empirical method and Gokcen's first approximation of regular solutions. The activity coefficients of various solute elements were calculated in solid phase of Cr, Mo, and W base dilute alloys at their melting point.

Key words
thermodynamic solution model by Tanaka, Cr, Mo, and W base dilute alloys, partial enthalpy

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