Analysis of twin-roll casting AA8079 alloy 6.35-μm foil rolling process

In this work the rolling process and properties of a 6.35-μm twin-roll casting AA8079 aluminum alloy foil was analyzed.First, the 8-mm-thick sheets were produced with a twin-roll casting technology.This product was annealed and cold rolled to a 6.35-μm foil with suitable processing conditions.The mechanical tests and microhardness measurement was applied to specimens derived from all the foil-rolling process stages.On the other hand, the specimens' surface roughness and the surface structure are visualized with an atomic force microscope and an SEM.The microstructural investigation is realized with an optical microscope and XRD.The von-Misses total effective strain was calculated by determining the incremental work for all of the cold-rolling cycle.The alloy showed very low ductility in the tensile tests because of the second-phase metastable intermetallic particles such as Al3Fe.The maximum elongation at the breaking value was measured for 256-μm-foil as 4.5 %.On the other hand, the alloy did not show any significant strain hardening after the cold rolling during the plastic-deformation stages.Keywords: aluminum foil, cold rolling, twin roll casting V delu je bil analiziran postopek valjanja in latnosti 6,35 folije iz AA8079 aluminijeve zlitine, ulite med dvema valjema.Najprej je bil izdelan 8 mm debel trak po postopku ulivanja med dvema valjema