COPPER ALLOY WIRE AND PROCESS FOR PRODUCING SAME

摘要

The zirconium content of the alloy composition of a copper alloy wire 10 of the present invention is 3.0 to 7.0 atomic percent, and the copper alloy wire 10 includes copper matrix phases 30 and composite phases 20 composed of copper-zirconium compound phases 22 and copper phases 21. As shown in Fig. 1 , the copper matrix phases 30 and the composite phases 20 form a matrix phase-composite phase fibrous structure and are arranged alternately parallel to an axial direction as viewed in a cross-section parallel to the axial direction and including a central axis. In addition, the copper-zirconium compound phases 22 and the copper phases 21 in the composite phases 20 form a composite phase inner fibrous structure and are arranged alternately parallel to the axial direction at a phase pitch of 50 nm or less as viewed in the above cross-section. This double fibrous structure presumably makes the copper alloy wire 10 densely fibrous to provide a strengthening mechanism similar to the rule of mixture for fiber-reinforced composite materials.