(19)

(11)

EP 2 347 023 A1

(12)

(43) Date of publication: 27.07.2011 Bulletin 2011/30 (21) Application number: 09737288.2 (22) Date of filing: 07.10.2009

(51) International Patent Classification (IPC):  C22C 21/00(2006.01) C22C 21/06(2006.01) C22F 1/043(2006.01) C22C 21/02(2006.01) C22F 1/04(2006.01) B22D 11/06(2006.01) (86) International application number: PCT/US2009/059820 (87) International publication number: WO 2010/042604 (15.04.2010 Gazette 2010/15)

(84) Designated Contracting States: 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 SE SI SK SM TR Designated Extension States: AL BA RS (30) Priority: 07.10.2008 US 246937 (71) Applicant: Alcoa Inc. Pittsburgh, PA 15212-5858 (US)	(72) Inventors: TOMES, David San Antonio Texas 78261 (US) TIMMONS, David W. Helotes Texas 78023 (US) WYATT-MAIR, Gavin F. Lafayette California 94549 (US) UNAL, Ali Export Pennsylvania 15632 (US) COLLINS, III, John W. Austin Texas 78735 (US) (74) Representative: Trinks, Ole et al Meissner, Bolte & Partner GbR Widenmayerstrasse 48 80538 München 80538 München (DE)