Wrought-procedure memory in caliber rolled Mg-Y-Zn alloy containing LPSO phase

Abstract

The possibility to control the deformation kink bands morphology was investigated by the caliber rolling process using the Mg-9 at.%Y-6 at.%Zn alloy with a volume fraction of ~100% in a long-periodic stacking ordered (LPSO) phase. Changing the insertion direction of the rolled billet was an effective method to control the area fraction of deformation kink bands formation. When the rolled billet was rotated 180° to the rolling direction in each rolling pass, deformation kink bands formed in not only the coarse-sized but also the fine-sized LPSO phases. These induced deformation kink bands had a higher density than those of the conventional inserted caliber rolled alloy. This is mainly due to the difference in shear direction to the rolled billet in every rolling pass. The rolled alloy with a high area fraction of deformation kink bands showed superior mechanical properties of hardness and strength at room temperature.