Michael H Skillingberg

52346625, Aug 10, 1993

Feb 15, 1991

7/655629

Edward S. Balmuth - Azle TX
David J. Chellman - Los Angeles CA
Frank W. Gayle - Gaithersburg MD
Richard A. Rainen - Sun Valley CA
Michael H. Skillingberg - Richmond VA

Reynolds Metals Company - Richmond VA

C22C 2112

420529

Aluminum based alloy primarily for use in aircraft and aerospace components consists essentially of the composition: 2. 60 to 3. 30 weight percent copper, 0. 0 to 0. 50 weight percent manganese, 1. 30 to 1. 65 weight percent lithium, 0. 0 to 1. 8 percent magnesium, and from 0. 0 to 1. 5 weight percent of grain refinement elements selected from the group consisting of zirconium, and chromium. Up to about 0. 5 wt. % zinc and up to about 1. 5 wt. % titanium may also be present. Minor impurities may also be present. These alloys exhibit an improved combination of characteristics including low density, high strength, high corrosion resistance and good fracture toughness.

55036902, Apr 2, 1996

Mar 30, 1994

8/220125

Kenneth D. Wade - Midlothian VA
Michael H. Skillingberg - Richmond VA

Reynolds Metals Company - Richmond VA

C22F 104

148550

In a method of extruding a 6000-series-type aluminum alloy by casting, homogenizing, extruding and optionally, aging and/or heat treating, an alloy composition is provided having silicon 0. 6-1. 2 wt. %, magnesium 0. 7-1. 2 wt. %, copper 0. 3-1. 1 wt. %, manganese 0. 1-0. 8 wt. %, zirconium 0. 05-0. 25 wt. %, up to 0. 5 wt. % iron, up to 0. 15 wt. % chromium, up to 0. 25 wt. % zinc, up to 0. 10 wt. % titanium with the balance aluminum and incidental impurities wherein an effective amount of zirconium, in combination with effective amounts of manganese, produces a fibrous grain structure which contributes to a combination of high strength and fracture toughness in the extruded alloy. The fibrous grain structure also permits improvements in forming the extrusion by enabling lower temperatures to be utilized during the homogenization step. In extruding this 6000-series-type aluminum alloy, a final product is produced having improved combinations of strength and fracture toughness for use in structural applications or the like.