2016 Volume 57 Issue 661 Pages 135-139
The effect of temperature on the stress-strain responses under cyclic plastic deformation on a rolled AZ31B sheet was investigated by performing in-plane cyclic tension-compression experiments at various temperatures ranging from room temperature to 200℃. The change in the crystallographic textures during the cyclic deformation was examined by XRD analysis. From room temperature to 137℃, three deformation modes, i.e., slip, twinning and detwinning, were active. In particular at room temperature, the three deformation modes sequentially occurred in compression- tension experiment, and as a result, an unusual cyclic stress-strain curve with tension-compression asymmetry was observed. At 200℃, the cyclic-stress-strain curve was symmetric and its stress level was much lower than that at R.T., since, at this elevated temperature, CRSSs of nonbasal slip systems were low because slip deformation occurs rather than twinning.
