Platinum-group-metal-based intermetallics as high-temperature structural materials

Abstract

Beyond Ni-Based Superalloys OverviewResearch on platinum-group-metal (PGM)-based intermetallic compounds, which are candidates as hightemperature structural materials, is reviewed in this article. The research reviewed focuses on PGM-based L1 2 and B2 compounds. Alloys with a face-centered cubic and L1 2 or B2 phase are also reviewed.

High Temperature Oxidation of Pt–Al–Cr–Ru Alloy: Scale Morphology and Adherence

“…This is because these alloys in some engine applications have already been exposed to temperatures up to 90% of the melting temperature of the base metal [3]. Precipitation-hardened Pt-based alloys with microstructures similar to Ni-based superalloys (NBSAs) are being developed to operate at higher temperatures than NBSAs, up to 1350°C [4][5][6][7][8]. These alloys are to serve as a possible replacement for some of the currently used nickel-based superalloy components in hot-sections of gas turbines, to improve efficiency of the engine, achieves greater thrust, and to reduce fuel consumption and CO 2 emissions [3].…”

Thermodynamic properties and lattice misfit of Ir-based superalloys

“…FðV; TÞ ¼ E 0 ðVÞ þ F ph ðV; TÞ þ F el ðV; TÞ; (1) where E 0 (V) is the static total energy at 0 K. F ph (V,T) is given by:…”

“…[1,2]. Similar to Ni-based superalloys, Ir-based superalloys possess a two-phase g/g 0 structure, and the ordered precipitate with the L1 2 structure (Ir 3 X) is coherently embedded in the g matrix with the fcc structure (Ir) [1,2]. It is well known that superalloys with this g/g 0 coherent two-phase microstructure are more resistant to creep deformation as g 0 precipitates prevent movement of dislocations [1e8].…”

First principle calculations of elastic and thermodynamic properties of Ir3Nb and Ir3V with L12 structure under high pressure

“…During the past decades, Ir-based superalloys have been pursued as the promising materials with high melting temperature (~2450 C), good high temperature strength, good oxidation resistance and high resistance to corrosion [3,4]. Yamabe et al [5e9] proposed "refractory superalloys", based on high melting point fcc metals such as iridium and rhodium with L1 2 intermetallic compounds.…”