Patent ID: 9177686
Filing Date: 2015-11-03
Classification: C22C,C22F,H01B,H01H

Abstract:
1. A copper alloy having high strength, high electrical conductivity, and excellent bendability, said copper alloy comprising, in terms of mass %, 0.4 to 4.0% of Ni; 0.05 to 1.0% of Si; and, as an element M, 0.005 to 1.0% of Cr, with the remainder being copper and inevitable impurities, wherein an atom number ratio M/Si of elements M and Si contained in a precipitate having a size of 50 to 200 nm in a microstructure of the copper alloy is from 0.01 to 10 on average, the atom number ratio being measured by a field emission transmission electron microscope with a magnification of 30,000 and an energy dispersive analyzer, wherein a number density of the precipitate having a size of 50 to 200 nm in the microstructure of the copper alloy is from 0.2 to 20 per μm wherein an average atom concentration of P contained in the precipitate having said size is from 0.1 to 80 at %, and wherein an average grain size represented by (Σx)/n is 30 μm or less, wherein n represents a number of grains and x represents a size of each of the grains, respectively, according to a measurement by a crystal orientation analysis method using a field emission scanning electron microscope and a backscattered electron diffraction image system mounted thereon.