Abstract
A new method, 'Reciprocating extrusion', developed to produce premium 7075 aluminum alloys was discussed. It was found that this method displayed the advantages in refining the phases, grains and inclusions, redistributing these constituents uniformly in the matrix. The improved mechanisms were also investigated besides evaluating the improvements in microstructures and mechanical properties. The results show that reciprocatingly extruded 7075 alloys have superior strength-toughness combinations and was found that the available yield strength used in unstable crack growth can reach up to 550 MPa.