EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

The study concerns formability and ductility of UFG plates made of commercial aluminum alloys 3003 and 5754 processed by ECAP-based methods, i.e. Incremental ECAP and multi turn ECAP followed by upsetting. It is demonstrated that the processes result in UFG microstructure with high fraction of high angle grain boundaries exceeding 60% and fairly uniaxial grain of equivalent diameter below 600 nm. The in plane anisotropy of the mechanical properties was examined by means of conducting uniaxial tensile test in various directions to last extrusion directions and by calculating Lankford parameter, which also describes formability. Plates processed by both methods exhibit tendency for wall thinning, which is typical for aluminum alloys, however are characterized by reduced planar anisotropy in comparison to plates obtained by other Severe Plastic Deformation methods. In order to improve ductility tensile tests were conducted under various conditions, i.e. strain rate and temperature, due to which it was possible to enhance ductility and even acquire total elongation exceeding 100%. To verify possibility of increasing formability in a complex stress state by introducing specific external conditions, cupping tests were conducted at various temperature and strain rate, which proved that it is possible to improve ability to forming expressed as dome height even by 70%.