COPPER ALLOY

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Disclosed is a copper alloy composed of Ni and/or Si, at least one or more substances selected from B, Al, As, Hf, Zr, Cr, Ti, C, Fe, P, In, Sb, Mn, Ta, V, S, O, N, misch metal (MM), Co and Be, and the balance of Cu and unavoidable impurities. This copper alloy has a precipitate X composed of Ni and Si and a precipitate Y composed of Ni and/or Si and at least one or more substances selected from B, Al, As, Hf, Zr, Cr, Ti, C, Fe, P, In, Sb, Mn, Ta, V, S, O, N, misch metal (MM), Co and Be, and the particle size of the precipitate Y is 0.01-2 μm.