Effect of heat treatments on the microstructure and formability of Al-Mg-Mn-Sc-Zr alloy

Microstructures and formability of scandium and zirconium added Al-Mg-Mn alloy sheets with various heating conditions were examined to improve their mechanical properties. Formability of these samples were judged by the Lankford value, r-value. It was possible to fabricate mechanically balanced Al-Mg-Mn-Sc-Zr alloy with high hardness 76.2 Hv and with high formability with r = 1.2, by not only adding scandium and zirconium but also optimizing the heat treatment conditions.