COPPER ALLOY FOR ELECTRICAL AND ELECTRONIC EQUIPMENT, COPPER ALLOY THIN SHEET FOR ELECTRICAL AND ELECTRONIC EQUIPMENT, AND COMPONENT AND TERMINAL FOR ELECTRICAL AND ELECTRONIC EQUIPMENT

摘要

A copper alloy for electrical and electronic equipment comprising 1.0-5.0 mass% Ni and 0.1-1.5 mass% Si, with the remainder being Cu and unavoidable impurities. Said copper alloy for electrical and electronic equipment has a composition having an Ni/Si (mass ratio) of 2.0-6.0. The special grain boundary length ratio (L&sgr;/L), being the ratio between the sum (L&sgr;) of each grain boundary length for &Sgr;3, &Sgr;9, &Sgr;27a, and &Sgr;27b and the length (L) of all crystal grain boundaries is at least 30%. The ratio (R{200}) for the X-ray diffraction intensity of the {200} plane in the material surface is at least 0.2.