Title:
HIGH-STRENGTH ALUMINUM CASTING ALLOYS RESISTANT TO HOT TEARING
Document Type and Number:
WIPO Patent Application WO/2009/126347
Kind Code:
A3
Abstract:
An aluminum casting alloy resistant to hot tearing includes, in wt%, about 4.0 to about 6.9 Zn, about 2.0 to about 3.5 Mg, about 0.6 to about 1.2 Cu, about 0.38 to about 0.57 Sc, about 0.18 to about 0.28 Zr, and the balance Al and impurities, substantially excluding Fe, Mn, and Si, said alloy characterized by a freezing range of less than about 150°C, solidus temperature above about 490°C, and eutectic phase fraction above about 5% at the late stages of solidification. The alloy is processed to form a dispersion of L12 particles inoculating fcc grains with a grain diameter of about 40 to about 60 µm, and ?'-phase precipitates enabling an ambient yield strength from about 410 MPa to about 540 MPa.
Inventors:
MISRA ABHIJEET (US)
KUEHMANN CHARLES (US)
JOU HERNG-JENG (US)
KUEHMANN CHARLES (US)
JOU HERNG-JENG (US)
Application Number:
PCT/US2009/031251
Publication Date:
September 30, 2010
Filing Date:
January 16, 2009
Export Citation:
Assignee:
QUESTEK INNOVATIONS LLC (US)
MISRA ABHIJEET (US)
KUEHMANN CHARLES (US)
JOU HERNG-JENG (US)
MISRA ABHIJEET (US)
KUEHMANN CHARLES (US)
JOU HERNG-JENG (US)
International Classes:
C22F1/053; C22C21/10
Domestic Patent References:
| WO2006127812A2 | 2006-11-30 | |||
| WO2005049878A2 | 2005-06-02 | |||
| WO2004090185A1 | 2004-10-21 |
Foreign References:
| US5055257A | 1991-10-08 | |||
| US5597529A | 1997-01-28 | |||
| US20050238528A1 | 2005-10-27 | |||
| RU2293783C1 | 2007-02-20 | |||
| JPH09279284A | 1997-10-28 |
Other References:
PAGLIA C S ET AL: "A cast 7050 friction stir weld with scandium: microstructure, corrosion and environmental assisted cracking", MATERIALS SCIENCE AND ENGINEERING A: STRUCTURAL MATERIALS:PROPERTIES, MICROSTRUCTURE & PROCESSING, LAUSANNE, CH LNKD- DOI:10.1016/J.MSEA.2006.03.065, vol. 424, no. 1-2, 25 May 2006 (2006-05-25), pages 196 - 204, XP025098821, ISSN: 0921-5093, [retrieved on 20060525]
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