THERMODYNAMIC AND EXPERIMENTAL-STUDY OF TI-AG-CU ALLOYS

Phase equilibria in the ternary Ti-Ag-Cu system have been studied ther modynamically and experimentally at various temperatures. The thermody namic analysis was performed by combining the most recent data on the binary Ag-Cu, Ti-Ag and Ti-Cu systems and experimental information obt ained by the diffusion couple technique. The eutectic and three non-eu tectic binary Ag-Cu alloys were melted and annealed in evacuated Ti am poules at temperatures of 900, 950 and 1000 degrees C for various time s and subsequently quenched in water. Both the calculations and the ex perimental results confirm that in the ternary system there is a misci bility gap, which divides the liquid phase into solutions of low and h igh Ti content. Furthermore, no ternary compounds were found. Several isothermal sections and the activity of titanium as a function of the copper-to-silver ratio and temperature are presented.