Title:
HIGH STRENGTH ALUMINUM ALLOYS AND PROCESS FOR MAKING THE SAME
Document Type and Number:
WIPO Patent Application WO2005003398
Kind Code:
A3
Abstract:
High strength aluminum alloys based on the Al-Zn-Mg-Cu alloy system preferably include high levels of zinc and copper to provide increased tensile strength without sacrificing toughness. In addition, small amounts of scandium are also preferably employed 5 to prevent recrystalization. Preferred ranges of the elements include by weight, 8.5-11.0% Zn, 1.8-2.4 % Mg, 1.8-2.6% Cu, 0.05-0.30% Sc and at least one element from the group Zr, V, or Hf not exceeding about 0.5%, the balance substantially aluminum and incidental impurities. During formation of the alloys, a homogenization process is preferably employed after alloy ingot casting in which a slow rate of temperature increase is employed as the alloy is heated as near as possible to its melting temperature. For the last 20-30F below the melting temperature, the rate of increase is limited to 20F/hr. or less to minimize the amount of low melting point eutectic phases and thereby further enhance fracture toughness of the alloy.
Inventors:
BROOKS CHARLES E
DORWARD RALPH C
PARKINSON RAY D
MATUSKA ROB A
SHAARBAF MORY
DORWARD RALPH C
PARKINSON RAY D
MATUSKA ROB A
SHAARBAF MORY
Application Number:
PCT/US2004/012661
Publication Date:
July 07, 2005
Filing Date:
April 22, 2004
Export Citation:
Assignee:
KAISER ALUMINIUM CHEM CORP (US)
BROOKS CHARLES E
DORWARD RALPH C
PARKINSON RAY D
MATUSKA ROB A
SHAARBAF MORY
BROOKS CHARLES E
DORWARD RALPH C
PARKINSON RAY D
MATUSKA ROB A
SHAARBAF MORY
International Classes:
C22C21/00; C22C21/10; C22F1/06; C22F3/00; C22C; (IPC1-7): C22C21/00
Foreign References:
| US20020162609A1 | 2002-11-07 | |||
| US20030087122A1 | 2003-05-08 | |||
| US5560789A | 1996-10-01 |
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