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The fcc/L1 2 coherent structure formed in the quaternary Ir-Nb-Ni-Al alloys. The ductility of quaternary Ir-Nb alloy was drastically improved by mixing with Ni-Al binary alloy. The two investigated alloys exhibited higher high-temperature 0.2% flow stress (e.g. above 1000 MPa at 1200 o C) and better ductility (~20% both at room temperature and 1200 o C). An excellent balance of high-temperature strength and ductility was obtained. The improvement of ductility was attributed to change the fracture mode from intergranular to transgranular.