The microstructure and flow behaviour during thixo backward extrusion of 7075 aluminium alloy were
investigated. Reheating the steel die and the aluminium billet placed into the die at the same time using
an induction furnace provides rapidly a very homogeneous microstructure suitable for thixoforming.
During thixoextrusion, despite the high solid fraction, the solid globules are weakly connected and slide
over each other without any plastic deformation. The flow remains quasi homogeneous resulting in
homogeneous induced microstructure of the component.