Copper alloy for electronic/electrical device, plastically-worked copper alloy material for electronic/electrical device, component for electronic/electrical device, terminal, and busbar

摘要

A copper alloy for an electronic and electric device includes: Mg in a range of 0.1 mass % or more and less than 0.5 mass %; and a Cu balance including inevitable impurities, wherein a graph, in which a vertical axis is dσ_t/dε_t and a horizontal axis is a true strain ε_t, dσ_t/dε_t being defined by a true stress σ_t and the true strain ε_t, obtained in a tensile test of the copper alloy, has a strained region that has a positive slope of dσ_t/dε_t.