Twin-roll cast Al-Mg-Sc alloy was submitted to deformation by cold-rolling. The influence of heat treatment 300 °C / 8 h, which was applied either before or after the deformation, on the deformation microstructure was studied by the means of scanning and transmission electron microscopy and by microhardness measurements. The cold-rolling leads to increase of dislocation density and fragmentation of the grains into subgrains. Annealing both before and after deformation causes precipitation hardening of the material. The in-situ annealing in transmission electron microscope leads to rearrangement of dislocations and partial recrystallization of the microstructure.Keywords: Al-Mg alloys, Al3(Sc,Zr) precipitates, electron microscopy, heat treatment
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