COPPER ALLOY FOIL FLEXIBLE PRINTED WIRING BOARD OBTAINED USING SAME AND PROCESS FOR PRODUCING COPPER ALLOY FOIL

摘要

The copper alloy foil according to the invention (10), and Zr is 3.0 at% or more at 7.0% or less in the alloy composition, the copper matrix 30, the copper compound -Zr phase 22 and the copper phase 21 including which it includes a composite image (20). 1, the copper matrix 30 and the composite image 20 is a matrix-by configuring the composite image layer type organization, as seen the cross-section perpendicular with respect to the width direction parallel to the copper mother phase and the direction of rolling the composite different that are alternately arranged. In addition, the composite 20 is copper when the -Zr compound 22 and the copper 21 constituting the layer type within the tissue and the composite, saw the above-described cross-section, a copper -Zr compound 22 and copper phase 21 are alternately arranged to be parallel to the rolling direction in the interval of less than 50 nm. Thus, by having a double-layer type of tissue, a dense layer type to which they yirum, strengthening mechanisms, such as the layered composite material is enhanced is considered made. ;