On microstructure and mechanical performance of AlCoCrFeMo0.5Nix high-entropy alloys

► The hardness of AlCoCrFeMo0.5Nix alloys decreases from Hv 904 with x = 0 to Hv 404 with x = 2.0. ► The alloys are superior in hardness and fracture toughness over the AlxCoCrCuFeNi alloys. ▶ Ni-0, Ni-0.5, and Ni-1.0 alloys are much harder than In 718, In 718H, and T-800 at 1273 K ▶ Ni-0, Ni-0.5, Ni-1.0, and Ni-1.5 alloys have higher softening resistance than In 718, In 718 H, and T-800. ► The AlCoCrFeMo0.5Nix alloys have great potential in high-temperature applications.