Fig. 1. Optical micrographs showing the microstructure on a section perpendicular to the fractured surface of the AlMgSiMn alloy, (a) over all microstructure, (b) the skin region, (c) the band zone, and (d) the central region.

Fig. 1. Optical micrographs showing the microstructure on a section perpendicular to the fractured surface
of the AlMgSiMn alloy, (a) over all microstructure, (b) the skin region, (c) the band zone, and (d) the
central region.