Copper alloy wire and method for producing the same

摘要

The zirconium content of the alloy composition of a copper alloy wire is 3.0 to 7.0 atomic percent; and the copper alloy wire includes copper matrix phases and composite phases composed of copper-zirconium compound phases and copper phases. The copper matrix phases and the composite phases 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. The copper-zirconium compound phases and the copper phases in the composite phases also 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 densely fibrous to provide a strengthening mechanism similar to the rule of mixture for fiber-reinforced composite materials.

主权项

1. A copper alloy wire comprising:
copper matrix phases; and composite phases comprising copper-zirconium compound phases and copper phases; wherein the zirconium content of alloy composition is 3.0 to 7.0 atomic percent; the copper matrix phases and the composite phases 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; the copper-zirconium compound phases and the copper phases in the composite phases 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 cross-section; the copper alloy wire contains oxygen in an amount of 700 to 2,000 ppm by mass; and wherein the composite phases contain 5% to 25% of amorphous phases in terms of area fraction as viewed in the cross-section.