二段階負荷を受ける純チタン板の変形挙動に及ぼす双晶活動の影響

抄録

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.