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(11)

EP 4 237 591 A1

(12)

(43) Date of publication: 06.09.2023 Bulletin 2023/36 (21) Application number: 21887724.9 (22) Date of filing: 01.11.2021

(51) International Patent Classification (IPC):  C22C 21/02(2006.01) C22F 1/043(2006.01) (52) Cooperative Patent Classification (CPC): C22C 21/02; B21C 23/002; C22F 1/05; C22F 1/04; C22C 21/08; C22C 21/00; C22F 1/053; B21C 29/003; C22C 21/003 (86) International application number: PCT/US2021/057580 (87) International publication number: WO 2022/094406 (05.05.2022 Gazette 2022/18)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 30.10.2020 US 202063108077 P (71) Applicant: Arconic Technologies LLC Pittsburgh, PA 15212-5858 (US)	(72) Inventors: RUAN, Yimin Pittsburgh, Pennsylvania 15239 (US) MASKELL, John S. New York 13694 (US) MURPHY, Bryan K. Massena, New York 13662 (US) BERUBE, Patrick Massena, New York 13662 (US) (74) Representative: Forresters IP LLP  Skygarden Erika-Mann-Straße 11 80636 München 80636 München (DE)