| 摘要 |
A casting aluminum alloy which contains, in terms of mass%, 3.2-5.0% Cu, 0.8-3.0% Ni, 1.0-3.0% Mg, 0.05-0.20% Ti, and up to 1.0% Si, the remainder being aluminum and incidental impurities. This casting aluminum alloy is used to produce a cast compressor impeller comprising a hub part, a hub-disk part extending from the hub part in the radial directions and having a hub surface and a disk surface, and blade parts disposed on the hub surface. Compared to conventional aluminum alloys, the casting aluminum alloy has a moderate elongation and a high strength at ordinary temperature and has high strength even at high temperatures. |
