抄録
Among advanced magnesium (Mg) alloys, Mg alloys containing long period stacking ordered (LPSO) phase (LPSO-type Mg alloys) have attracted considerable attention because of the superior strength compared with conventional Mg alloys. Extensive researches on LPSO-type Mg alloys show that one possible strengthening mechanism for LPSO-type Mg alloys is the contribution of a number of kink bands in LPSO phase which are formed during metal forming processes. In this study, kink band formation process in LPSO-type Mg alloys subjected to extrusion is numerically investigated. The analysis model is consisted of a-Mg phase with random texture and LPSO phase with strong extrusion texture. For the boundary conditions, equi-biaxial compressive loading is applied by displacement control. The results show that significant misorientations are introduced in LPSO phase during the deformation. Quantitative evaluation of the changes in crystal orientation suggests that intragranular misorientations should be developed both parallel to and perpendicular to the extrusion axis.
