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

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 301; no. 2; pp. 167 - 179
• Main Authors: Hill, P.J, Biggs, T, Ellis, P, Hohls, J, Taylor, S, Wolff, I.M
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 31.03.2001; Elsevier
• Subjects: Applied sciences; Exact sciences and technology; Hardness; High-temperature; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Microstructure; Other mechanical properties; Oxidation; Platinum alloys; Superalloys; Oxidation; High-temperature; Superalloys; Hardness; Microstructure; Platinum alloys; Heat treatment; Phase composition; High temperature; Experimental study; Precipitation hardening; Microhardness; Platinum base alloys; Optical microscopy; Dual phase structure; Oxidation stability; Transition metal alloy; Application
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/S0921-5093(00)01471-4

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 Pt 3X, where (Pt) has an fcc structure and ideally, Pt 3X, an ordered fcc (L1 2) 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.