| 摘要 |
Disclosed is a copper alloy. The copper alloy consists essentially of Cu : 69 to 88 mass %, Si : 2 to 5 mass %, Zr: 0.0005 to 0.04 mass %, P : 0.01 to 0.25 mass %, and Zn : balance; has relation of, in terms of a content of an element a, [a] mass %, f0=[Cu]-3.5[Si]-3[P]=61 to 71, f1=[P]/[Zr]=0.7 to 200, f2=[Si]/[Zr]=75 to 5000, and f3=[Si]/[P]=12 to 240; has a metal structure that contains alpha phase and, K phase and/or gamma phase, and has relation of, in terms of a content of a phase b, [b]%, in an area rate, f4=[alpha]+[gamma]+[K]>=85 and f5=[gamma]+[K]+0.3[mu]-[beta]=5 to 95; and has an average grain diameter of 200 mum or less in a macrostructure when melted and solidified.
|
