The microstructure and compressive properties of quaternary refractory superalloys from two binary alloys which were composed of face centered cubic (fcc)/L12 coherent structures were examined. Ir-Ta and Ni-Al alloys were mixed in different proportions to form a quaternary superalloys. A three-phase equilibrium exists in the alloys including 25% and 75% Ir-based alloys, consisting of two kinds of L12 (Ir3Ta and Ni3Al types) and fcc structure. A four-phase equilibrium exists in the alloy including 50% Ir-based alloy after heated at 1300 °C for 168 hours consisting of two kinds of L12, fcc, and B2 structures. At 1200 °C, these alloys exhibited higher yield stress and compressive strains than that of Ni-based superalloys during the compressive tests.
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