COMPRESSOR IMPELLER CAST FROM AL ALLOY AND METHOD FOR PRODUCING SAME

摘要

The present invention provides: a compressor impeller that cast from an aluminum alloy, has superior production characteristics, and exhibits stable high-temperature strength when used at temperatures around 200°C; and a method for producing same. The compressor impeller that is cast from an Al alloy is provided with a boss section, a plurality of vane sections and a disc section; the boss section, the plurality of vane sections and the disc section excluding the end section comprise an Al alloy comprising a predetermined metal composition; and at the end section of the disc section, there are at least 10,000/mm 2 of intermetallic compounds having a circle-equivalent diameter of 1-6 µm, and there are no greater than 500/mm 2 of intermetallic compounds having a circle-equivalent diameter exceeding 6µm.