Patent ID: 7435305

Claim:
A compressor wheel made of a cast aluminum alloy, wherein the cast aluminum alloy consisting essentially of Cu 1.4 to 3.20% by mass, Mg 1.0 to 2.0% by mass, Ni 0.5 to 2.0% by mass, Fe 0.5 to 2.0% by mass, and at least one selected from the group consisting of Ti 0.01 to 0.35% by mass, Zr 0.01 to 0.30% by mass, Sc 0.01 to 0.8% by mass, and V 0.01 to 0.5% by mass, with the balance being aluminum and inevitable impurities, the inevitable impurities comprising Si up to about 0.3% by mass, and Zn, Mn and Cr up to about 0.2% by mass, with the [(Cu content)+0.5×(Mg content)] being 3.8% by 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.