(19)

(11)

EP 2 771 493 A2

(12)

(88) Date of publication A3: 31.10.2013 (43) Date of publication: 03.09.2014 Bulletin 2014/36 (21) Application number: 12787267.9 (22) Date of filing: 26.10.2012

(51) International Patent Classification (IPC):  C22C 21/02(2006.01) C22C 21/04(2006.01) (86) International application number: PCT/US2012/062250 (87) International publication number: WO 2013/063488 (02.05.2013 Gazette 2013/18)

(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 (30) Priority: 28.10.2011 US 201161628321 P (71) Applicant: Alcoa Inc. Pittsburgh, PA 15212-5858 (US)	(72) Inventors: YAN, Xinyan Murryville, PA 15668 (US) LIN, Jen, C. Export, PA 15632 (US) (74) Representative: Lenzing Gerber Stute  Partnerschaft von Patentanwälten Bahnstraße 9 40212 Düsseldorf 40212 Düsseldorf (DE)