Length Changes in Extruded Magnesium Alloy Bars Under Large Strain Free-End Torsion

We numerically study the large strain free-end torsion of extruded magnesium alloy bars based on the recently developed Elastic Visco-Plastic Self-Consistent (EVPSC) model, in which both slip and twinning contribute to plastic deformation. It is shown that the predicted second-order length change is very sensitive to the initial texture and texture evolution. Numerical results suggest that the free-end torsion test can provide an effective means for assessing the adequacy of polycrystal plasticity models for magnesium alloys.