An assessment of Ir-Pt-Al alloys for high-temperature materials

To design high-temperature materials with suitable ductility and high strength at high temperatures, Ir-Pt-Al alloys were investigated. It is expected that precipitation hardening by the B2 phase and solid-solution hardening of Ir by Pt and Al occur in the Ir-Pt-Al alloys. The phase constitution and microstructure were investigated by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and electron probe microscopy analysis (EPMA). Compression creep tests were then carried out with some of these alloys at 1773 K under 30 MPa. The creep mechanism is discussed in terms of the microstructure and phase constituents. Finally, the potential of Ir-Pt-Al alloys as high-temperature materials is discussed.