Upgrading in Mechanical Properties of High Performance Aluminum Alloys by Compressive Torsion Process

The originally developed severe plastic deformation process, the compressive torsion process (CTP) was applied to Al-Fe series alloys to improve their ductility and waste 7050 alloy chips to reprise their solid phase recycling. In the Al alloys containing Fe element, the large precipitates with length of 500∼1000 μm were refined under 20 μm and dispersed uniformly in the matrix alloy. Then the ductility was significantly improved to over 30% elongation from 5% or below before the CTP. In the solid phase recycling of waste 7050 alloy chips, the chips can be consolidated into high density bulk alloy with good strength and ductility even at lower temperature by the CTP. The consolidation at elevated temperature is suitable for the subsequent heat treatment like annealing or solid solution treatment.