| 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/mm2 of intermetallic compounds having a circle-equivalent diameter of 1-6 μm, and there are no greater than 500/mm2 of intermetallic compounds having a circle-equivalent diameter exceeding 6 μm. |
| 主权项 |
1. A compressor impeller cast from an Al alloy, comprising:
a boss section; a plurality of vane sections; and a disc section, wherein the boss section, the plurality of vane sections, and the disc section excluding an end section comprise an Al alloy comprising 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 %, Ti: 0.01 to 0.35 mass %, and B: 0.002 to 0.070 mass % and a balance of Al and unavoidable impurities, wherein the end section of the disc section comprises an Al alloy comprising 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 %, Ti: 0.005 to 0.175 mass %, and B: 0.001 to 0.035 mass % and a balance of Al and unavoidable impurities, and wherein at least 10000/mm2 of intermetallic compounds having a circle-equivalent diameter of 1 to 6 μm, and no greater than 500/mm2 of intermetallic compounds having a circle-equivalent diameter exceeding 6 μm exist in the end section of the disc section. |
