US 11,946,129 B2
Cu—Ni—Al based copper alloy sheet material, method for producing same, and conductive spring member
Toshiya Shutoh, Tokyo (JP); and Hisashi Suda, Tokyo (JP)
Assigned to DOWA METALTECH CO., LTD., Tokyo (JP)
Appl. No. 17/270,132
Filed by DOWA METALTECH CO., LTD., Tokyo (JP)
PCT Filed Aug. 20, 2019, PCT No. PCT/JP2019/032505
§ 371(c)(1), (2) Date Feb. 22, 2021,
PCT Pub. No. WO2020/066371, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 2018-182691 (JP), filed on Sep. 27, 2018.
Prior Publication US 2021/0238724 A1, Aug. 5, 2021
Int. Cl. C22F 1/08 (2006.01); C22C 9/06 (2006.01)
CPC C22F 1/08 (2013.01) [C22C 9/06 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A copper alloy sheet material having a composition containing, in terms of % by mass, Ni: more than 12.0% and 30.0% or less, Al: 1.80-6.50%, Mg: 0-0.30%, Cr: 0-0.20%, Co: 0-0.30%, P: 0-0.10%, B: 0-0.05%, Mn: 0-0.20%, Sn: 0-0.40%, Ti: 0-0.50%, Zr: 0-0.20%, Si: 0-0.50%, Fe: 0-0.30%, and Zn: 0-1.00%, with the balance of Cu and unavoidable impurities, and satisfying the following expression (1), and
having a metallic structure having, on an observation plane in parallel to a sheet surface, a number density of fine secondary phase particles having a particle diameter DM defined by the following (A) of 20 to 100 nm of 1.0×107 per mm2 or more:
Ni/Al≤15.0  (1)
wherein in the expression (1), the atomic symbols are substituted by the contents of the elements expressed with % by mass,
(A) assuming that for one secondary phase particle, a diameter (nm) of a minimum circle surrounding the particle is referred to as a “major diameter”, and a diameter (nm) of a maximum circle encompassed in a contour of the particle is referred to as a “minor diameter”, a value shown by (major diameter+minor diameter)/2 is designated as the particle diameter DM of the particle.