Patent ID: 11959161
Assignee: FURUKAWA ELECTRIC CO., LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 5:
6. A method for producing a copper-based alloy material according to claim 1, the copper-based alloy material comprising a composition comprising 8.6 to 12.6% by mass of Al, 2.9 to 8.9% by mass of Mn, 3.2 to 10.0% by mass of Ni, and Cu,
the method comprising:
(i) melting and casting raw materials of the copper-based alloy material;
(ii) performing hot working;
(v) performing each of a step (iii) performing intermediate annealing in a first temperature range of 400 to 680° C. and a step (iv) performing cold working in which a working rate is equal to or greater than 30% at least one or more times in this order and thereafter further performing additional intermediate annealing in a second temperature range of 400 to 550° C.;
(vi) performing heating from room temperature to a third temperature range of 400 to 650° C. and holding the third temperature range;
(vii) further performing heating from the third temperature range to a fourth temperature range of 700 to 950° C. and holding the fourth temperature range; and
(x) repeating a step (viii) performing cooling from the fourth temperature range to the third temperature range and holding the third temperature range and a step (ix) performing heating from the third temperature range to the fourth temperature range and holding the fourth temperature range at least two or more times and thereafter performing quenching from the fourth temperature range.