Microstructure controlled bending response in AA6016 Al alloys

► The hemmability of two AA6016-type aluminium alloys in T4P temper state is studied. ► High Mg content and long solutionizing times increase the precipitation potential. ► Inhomogeneous grain boundary particles form by precipitation of alloying elements. ► Large amount of particles combined with high matrix strength reduce the hemmability. ► Intergranular fracture is promoted by grain boundary debonding and voids formation.