oa Experimental Study of the Phase Relations in the Ternary Au-Pd-Ti and Au-Rh-Ti Systems at 1000°C

The isothermal section of the ternary systems Au-Pd-Ti and Au-Rh-Ti at 1000°C was studied using the diffusion couple technique. These alloying systems are relevant for various technical applications, as functional materials e.g. high temperature shape memory alloys, brazing filler metals, luxury items or biomedical implants. The research presents, for the first time, a comprehensive determination of phase relations and tie-triangles in these systems, identifying solid solubility of the various intermetallic compounds. The binary intermetallic compounds of Au and Pd with Ti show a large solubility of the third alloying element, where Au and Pd replace each other a fixed Ti content. A complete solid solubility was observed between TiAu2 and αPd2Ti. The binary phases with B2 structure form a large single phase field with (βTi) that surrounds the phase field of Ti3Au. Moreover, this research sets the groundwork for further investigations into these alloys, recommending specific sample compositions for future studies to refine understanding of phase boundary definitions.