COPPER ALLOY FOR ELECTRONIC/ELECTRICAL DEVICES, COPPER ALLOY PLANAR BAR STOCK FOR ELECTRONIC/ELECTRICAL DEVICES, COMPONENT FOR ELECTRONIC/ELECTRICAL DEVICES, TERMINAL AND BUS BAR

摘要

This copper alloy for electronic/electrical devices contains from 100 mass ppm to 400 mass ppm of Mg, from 5 mass ppm to 20 mass ppm of Ag and less than 5 mass ppm of P, with the balance being made up of Cu and unavoidable impurities; and if NF_J3 is the ratio of J3, where all three grain boundaries constituting a grain boundary triple junction are special grain boundaries, to all grain boundary triple junctions, and NF_J2 is the ratio of J2, where two grain boundaries constituting a grain boundary triple junction are special grain boundaries and one grain boundary constituting the grain boundary triple junction is a random grain boundary, to all grain boundary triple junctions, the relational expression 0.22 < (NF_J2/(1 – NF_J3))^0.5 ≤ 0.45 is satisfied.