Inventors:
Jeffrey J. Witters - Pittsburgh PA
Brian A. Cheney - Bettendorf IA
Roberto J. Rioja - Lower Burrell PA
Assignee:
Aluminum Company of America - Pittsburgh PA
International Classification:
C22F 104
Abstract:
Disclosed is a method of making lithium-containing aluminum base alloy extrusion having at least a section thereof having a low aspect ratio, the extrusions having improved properties in sections thereof having the low aspect ratio. The method comprises providing a body of a lithium-containing aluminum alloy, extruding a low aspect ratio extrusion section, the aspect ratio being in the range of 1 to 2. 5, and maintaining the body in a temperature range of 400. degree. to 1000. degree. F. and at least a 4:1 extrusion reduction during said extrusion step, the extrusion section having tensile yield strength of at least 60 ksi and having an ultimate yield strength of at least 4. 5 ksi greater than the tensile yield strength.