Patent ID: 9587299
Date: 2017-03-07
CPC Classifications: C22C,C22F,H01B

Claim:
1. A rolled copper alloy material for electronic devices, consisting of: a binary alloy of Cu and Mg, wherein the binary alloy is a Cu—Mg solid solution alloy supersaturated with Mg, the binary alloy consists of Mg at a content of 3.3 at % or more and 6.9 at % or less, and a remainder of Cu and unavoidable impurities, an amount of Zn as an unavoidable impurity is less than 0.01 mass %, a total amount of the unavoidable impurities is in a range of 0.3 mass % or less, the rolled copper alloy material is a sheet or a strip, the binary alloy has a measured value of electrical conductivity, σ, in a range of 31.2-44.1% IACS, wherein the measured value of electrical conductivity is less than or equal to an upper limit of electrical conductivity, in %, calculated by the formulaic expression, {1.7241/(−0.0347×X a stress relaxation rate is in a range of 50% or less after heating at 150° C. for 1,000 hours, and a 0.2% proof stress σ