Abstract
Mg alloys with long-period stacking ordered structure (LPSO) phase show excellent mechanical properties such as high specific strength. Although it is known that kink band formation in LPSO phase during plastic working strengthens the alloy, there is not much information about how the kink bands progress in the alloy. Also, the effect of misorientation between crystals has not been investigated sufficiently. We developed a dislocation-based crystal plasticity model suitable for crystals of LPSO phase and demonstrated two-dimensional FE analysis for single crystal of Mg-based LPSO phase. In this study, we carry out FE compression analysis for polycrystalline Mg alloy with LPSO phase in which single crystal of LPSO phase is sandwiched between two crystals of a-Mg phase. We use same computational model mentioned above for both LPSO phase and a-Mg phase of the alloy, however we distinguish each phase by assigning different CRSS to respective slip systems in each phase. Through this numerical simulation, we discuss the effect of a-Mg phase on kinking of LPSO phase.
