Thermodynamic modelling of the Ag-Cu-Ti ternary system.

Olivier Dezellus (1) , Raymundo Arroyave (2) , Suzana G. Fries (3)

1 LMI - Laboratoire des Multimatériaux et Interfaces
2 Department of Mechanical Engineering and Materials Science
3 ICAMS - Interdisciplinary Centre for Advanced Materials Simulation

The Ag-Cu-Ti system is important for brazing applications, particularly for ceramic joining. This system is characterized by numerous intermetallics in the {Cu-Ti} binary and the existence of a miscibility gap in the liq. phase. For applications, knowledge of the phase equil., invariant reactions in the temp. range of interest and thermodn. activity values (mainly of Ti) are important. Thermodn. model parameters for all the stable phases in the Ag-Cu, Cu-Ti and Ag-Ti systems, previously obtained using the Calphad method and available in the literature are used. A new thermodn. description for the ternary interaction parameter of the liq. is obtained from exptl. informations. Ti2Cu and Ti2Ag which have the same crystallog. structure were modelled as a single phase. The same was done for TiCu and TiAg. Finally, solid soly. of Ag in the Ti-Cu intermetallics is taken into account. The parameters obtained in this assessment are later used for the calcn. of selected sections that can be useful for research and applications in the field of joining with Ti-activated Ag-Cu braze.

Mots clés: CALPHAD; braze alloy; phase diagram; Ag-Cu-Ti

Domaines: Matériaux

Olivier Dezellus, Raymundo Arroyave, Suzana G. Fries. Thermodynamic modelling of the Ag-Cu-Ti ternary system.. International Journal of Materials Research, 2011, 102 (3), pp.286-297. ⟨10.3139/146.110472⟩. ⟨hal-00623284⟩