Thermodynamic Assesment of The Cu - Ti System in Microalloyed Copper Base Alloys

Résumé

The correlations made between thermodynamic and kinetic data of the heterogeneous systems provided insight into the alloys properties. Experimental researches presented in this paper refer to the thermodynamics of Cu-Ti binary system for very low concentrations of titanium in copper from 0.006 ⋅ 10^-2 ÷ 0.340 ⋅ 10^-2 mole fractions at 1372 K, at 1423 K temperatures. By electrochemical method the thermodynamics activities and activity coefficients at 1372 K, 1423 K were determined. The Associated Solution Model (ASM) parameters have been used to describe the thermodynamic properties of the Cu-Ti dilute solutions. Analytical expression has been derived to express the activity of titan in copper and the activity coefficient. The first and second order Wagner’s selfinteraction parameters were given as a function of ASM parameters.