Serrated yielding behavior after cold and hot rolling of a high Mg content Al–Mg alloy

Abstract

Deformation of Al–Mg alloys may be associated with dynamic strain aging which results to serrated yielding of these materials. In-solute Mg atoms and mobile dislocations are the main players of this phenomenon; So, they should be controlled during production of Al–Mg alloys. In this research, hot and cold rolling processes with different rolling reductions are performed on Al–6Mg alloy, and then subjected to tensile test due to investigate the severity of serration. Results show that serration is more severe in the annealed cold rolled Al–Mg alloys than that in hot rolled ones due to more in-solute Mg atoms for the cold rolled samples. Increasing in rolling reduction causes serrated yielding to be intensified for both hot and cold rolled alloys by affecting the dislocations and in-solute Mg atoms. For hot rolled samples, serrated yielding is delayed to start in comparison with cold rolled ones. This delay increases the attractiveness of using hot rolling process to produce Al–Mg sheets for the applications need to form the produced sheets.