Joel D Bowers, Age 50268 S Stewart St, Blairsville, PA 15717

4790884, Dec 13, 1988

Mar 2, 1987

7/020600

Kenton P. Young - Plum Boro PA
Edward L. Colvin - Monroeville PA
Joel A. Bowers - Bettendorf IA
Robert W. Westerlund - Bettendorf IA

Aluminum Company of America - Pittsburgh PA

C22F 104

148 2

Disclosed is a method of making aluminum base alloy flat rolled product substantially free of Luder's lines after stretching, the method comprising the steps of providing a body of a lithium-containing aluminum base alloy and working the body to produce a flat rolled product prior to solution heat treating and quenching. The flat rolled product is preaged for a time and temperature which does not substantially affect mechanical properties but which permits stretching the flat rolled product without formation of Luder's lines. Thereafter, the preage flat rolled product is stretched and aged to a condition having a substantially stable level of mechanical properties.

5066342, Nov 19, 1991

Jun 19, 1989

7/367791

Roberto J. Rioja - Lower Burrell PA
Joel A. Bowers - Bettendorf IA
R. Steve James - Gibsonia PA

Aluminum Company of America - Pittsburgh PA

C22F 104

148 127A

An aluminum base alloy wrought product having an isotropic texture and a process for preparing the same is disclosed. The product has the ability to develop improved properties in the 45. degree. direction or more uniform properties throughout the thickness and in the short transverse direction in response to an aging treatment and is comprised of 0. 2 to 5. 0 wt. % Li, 0. 05 to 6. 0 wt. % Mg, at least 2. 45 wt. % Cu, 0. 1 to 1. 0 wt. % Mn, 0. 05 to 12 wt. % Zn, 0. 5 wt. % max. Fe, 0. 5 wt. % max. Si, the balance aluminum and incidental impurities. The product has imparted thereto, prior to a hot rolling step, a recrystallization effect to provide therein after hot rolling a metallurgical structure generally lacking intense work texture characteristics. After an aging step, the product has improved levels of properties in the 45. degree. direction or more uniform properties throughout the thickness and in the short transverse direction.