An assessment of ternary precipitation-strengthened Pt alloys for ultra-high temperature applications

Platinum alloys with analogous microstructures to the Ni-base superalloys, but with higher melting temperatures, were investigated. In a preliminary investigation, ternary Pt–X–Z compositions were selected to yield two-phase microstructures consisting of (Pt) and Pt3X, where (Pt) has an fcc structure and ideally, Pt3X, an ordered fcc (L12) structure. The alloys were ranked in terms of their microstructures, oxidation resistance, room-temperature hardness and resistance to cracking at room temperature. It was found that alloys based on Pt–Al–Z have potential based on their superior environmental and mechanical properties.