Two-Phase Iridium-Based Refractory Superalloys - Their Development & Possibilities As High Temperature Structural Materials

A new class of alloys based on platinum group metals, which are called refractory superalloys, is proposed. These refractory superalloys have a f.c.c. and LI2 coherent two-phase structure (similar to that of nickel-based superalloys), high melting temperatures, and good potential as structural materials for use at temperatures up to 1800 deg C. In this paper, the results on the strength behaviour, creep property, ductility and fracture mode of iridium-based refractory superalloys are reported.