Copper alloy wire rod and method for manufacturing the same

A method for manufacturing a copper alloy wire rod comprising:

• a melting step of melting a raw material of a copper alloy having a Zr content within the range of 0.2 atomic percent or more and 1.0 atomic percent or less to obtain a molten metal;
• a casting step of casting the molten metal so as to obtain an ingot;
• and
• a wire drawing step of subjecting the ingot to a cold wire drawing performed at lower than 500° C. and a treatment after the cold wire drawing performed at lower than 500° C.;
• wherein the copper alloy wire rod comprises a copper parent phase and short fiber-shaped composite phases which are dispersed in the copper parent phase and which contain Cu8Zr3 and Cu,
• wherein the composite phase has a length L in the wire drawing direction and a length T in the direction orthogonal to the wire drawing direction, which satisfy 1.5≦L/T<17.9,
• wherein the copper alloy wire rod has an electrical conductivity of 70% IACS or more and a tensile strength of 700 MPa or more, and
• wherein the copper alloy is a binary alloy.