Thermodynamic Assessment of the Ag-Cu-Ti System
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abstract
A thermodynamic description for the Ag-Ti binary system was developed using all the existing experimental phase diagram data available and the resulting parameters were discussed in light of very recent thermochemical measurements of Ag-Ti melts. Using the description of the Ag-Ti binary and with the accepted descriptions for the Ag-Cu and Cu-Ti sub-systems, the Ag-Cu-Ti ternary system is critically assessed and a thermodynamic model is developed so the available experimental data are represented as accurately as possible. The phases CuTi2 and AgTi2 are modeled using a single two-sublattice model, (Ag,Cu)1(Ti)2, assuming that these phases form a continuous solid solution. The CuTi and AgTi phases are also modeled using a single sublattice model, (Ag,Cu,Ti)1(Ag,Cu,Ti)1, and their penetration into the ternary compositional triangle is correctly predicted. Ternary interactions for the liquid phase were incorporated. Experimental and calculated results are compared and the reliability of the model is confirmed.
