HEAT-RESISTANT AND CREEP-RESISTANT ALUMINUM ALLOY AND BILLET THEREOF, AND METHOD FOR THEIR PRODUCTI

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A heat-resistant, creep-resistant aluminum alloy according to the present invention contains at least 10 mass % and not more than 30 mass % of silicon, at least 3 mass % and not more than 10 mass % of at least either iron or nickel in total, at least 1 mass % and not more than 6 mass % of at least one rare earth element in total and at least 1 mass % and not more than 3 mass % of zirconium with the rest substantially consisting of aluminum, while the mean crystal grain size of silicon is not more than 2 mu m, the mean grain size of compounds other than silicon is not more than 1 mu m, and the mean crystal grain size of an aluminum matrix is at least 0.2 mu m and not more than 2 mu m. Thus, an aluminum alloy excellent in heat resistance and creep resistance is obtained.