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(11)

EP 4 158 077 A1

(12)

(43) Date of publication: 05.04.2023 Bulletin 2023/14 (21) Application number: 21818989.2 (22) Date of filing: 27.05.2021

(51) International Patent Classification (IPC):  C22C 21/02(2006.01) B22D 21/04(2006.01) C22F 1/043(2006.01) B22D 17/00(2006.01) (52) Cooperative Patent Classification (CPC): B22D 21/04; C22C 21/02; C22F 1/043 (86) International application number: PCT/US2021/034577 (87) International publication number: WO 2021/247373 (09.12.2021 Gazette 2021/49)

(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: 01.06.2020 US 202063032973 P (71) Applicant: Alcoa USA Corp. Pittsburgh, PA 15212-5858 (US)	(72) Inventor: YAN, Xinyan Murrysville, Pennsylvania 15668 (US) (74) Representative: Forresters IP LLP  Skygarden Erika-Mann-Straße 11 80636 München 80636 München (DE)