Cast aluminum alloy compressor wheel for a turbocharger

摘要

A compressor wheel made of a cast aluminum alloy, wherein the cast aluminum alloy contains Cu 1.4 to 3.2 mass%, Mg 1.0 to 2.0 mass%, Ni 0.5 to 2.0 mass%, Fe 0.5 to 2.0 mass%, and at least one selected from the group consisting of Ti 0.01 to 0.35 mass%, Zr 0.01 to 0.30 mass%, Sc 0.01 to 0.8 mass%, and V 0.01 to 0.5 mass%, with the balance being aluminum and inevitable impurities, with the [(Cu content) + 0.5 × (Mg content)] being 3.8 mass% or less, and with a secondary dendrite arm spacing being 50 µm or less, wherein the cast aluminum alloy is being reinforced by a solution treatment and an aging treatment, and wherein the compressor wheel shows good heat resistant strength, and is for use in a turbocharger.