Investigation of the tensile response and the microstructural evolution during hot drawing of multi-layered, ultrafine-grained AA6014 sheets by thermomechanical analyzes

Abstract Mechanical strengthening of sheet material can be realized by accumulative roll bonding, which belongs to the severe plastic deformation processes. Beside fine-grain hardening also work and precipitation is responsible for rise strength. However, this accompanied a significant decrease in ductility. Thus, need an enhancement ductility essential sufficient formability later applications was already introduced tailored heat treatments. The challenge, however, realize process temperature that leads degradation dislocations dissolution MgSi-precipitations, without recrystallization fine-grained microstructure coarse grain sizes. In order identify suitable range avoid recrystallization, hot forming experiments are carried out at successive temperatures from 20 300°C. Tensile specimens drawn with thermomechanical simulator Gleeble 3500 (Dynamic Systems Inc.) aided strain measurement system Aramis (GOM GmbH). aim investigate dependence mechanical properties range, high strength simultaneous enhanced maintained.