| 摘要 |
An object of the present invention is to provide copper alloy which has a dimensionless performance index value M satisfying an inequality: M>400 in either a binary system alloy composition containing Cu and Zr, or a ternary system alloy composition containing Cu, Zr, and B. In the copper alloy of the present invention, a composition by atomic percent is expressed by a composition formula: Cu<SUB>100-(a+b)</SUB>Zr<SUB>a</SUB>B<SUB>b</SUB>, and a dual phase structure having a layered structure including a plurality of Cu matrices constituted by grain particles and an eutectic phase constituted by the Cu matrix and any of a Cu-Zr compound and a Cu-Zr-B compound is constituted. Part of each of the grain particles contacts other grain particles, and the "a", the "b", and the "(a+b)" satisfy 0.05<=a<=8.0, 0<=b<=4.0, and a+b<=8.0.
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