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

摘要

A heat-resistant and creep-resistant aluminum alloy, which has a chemical composition: silicon: 10 to 30 mass %, at least one of iron and nickel: 3 to 10 mass % in total, at least one rare earth element: 1 to 6 mass % in total, zirconium: 1 to 3 mass %, and balance: substantially aluminum, has an average crystal grain diameter of silicon of 2 µm or less, an average grain diameter of a compound other than silicon of 1 µm or less, and an average crystal grain diameter of the aluminum matrix of 0.2 to 2 µm. The aluminum alloy exhibits excellent resistance to heat and creep.