Effect of twinning on two-step deformation behavior of a commercially pure titanium sheet

Abstract

In the present study, the two-step deformation behavior in a commercially pure titanium sheet was studied by means of experiments and crystal plasticity finite-element simulations. Two-step loading tests with various pre-strains and loading conditions were carried out. When pre-tension was given in the first loading and the tensile deformation was given along the RD in the second loading, the 0.2% proof stress in the second loading decreased with the increase in the angle between the first and second loading directions. Experimental and numerical results showed that the activity of {1012} detwinning increased with the increase in the angle. These results suggested that the 0.2% proof stress in the second loading was affected by the twinning formed in the first loading.