Extrusion of 2xxx and 7xxx Alloys

-The basic differences in extruding high-strength 2xxx and 7xxx alloys, compared to the more common 6xxx alloys, are outlined in an attempt to present both limitations and opportunities to any extruder interested in processing these alloys. Requirements in terms of extrusion pressure, speed and temperature control are described, with reference to the fundamental characteristics and constitutive equations for a range of these higher-strength alloys. Attention is given to avoidance of defects specific with some of these high-strength alloys, such as recrystallization. Finally, some financial model analyses compare costs for typical extruded shapes in a selection of these alloys.