Patent ID: 6918975

Claim:
A method of extruding structural members comprising: (a) providing an alloy comprising: about 3.6 to about 4.2 wt. % copper, about 1.0 to about 1.6 wt. % magnesium, about 0.3 to about 0.8 wt. % manganese, about 0.05 to about 0.25 wt. % zirconium, the balance substantially aluminum, incidental elements and impurities; (b) homogenizing said alloy at a temperature between about 855° and 880° F. prior to extruding said alloy at a temperature within about 500° to about 750° F. to form an extrusion; (c) solution heat treating said extrusion; and (d) quenching said extrusion before making a structural member therefrom.