Texture Analysis In Commercially Pure Titanium After Single-passed ECAP At Room Temperature By Crystal Plasticity Finite Element Simulation

The Crystal Plasticity Finite Element Simulation is a way to integrate the CrystalPlasticity Method and the finite element simulation. The article used CPFEM to analyzethe polycrystal pure titanium deformation during Single-Passed120°and135°equalchannel angular pressing (ECAP) in room temperature. The first step is theaccomplishment of CPFEM mathematical model that can transfer the theory into acomputer language and outputting to UMAT that can be read in ABAQUS. The nextstep is creating the3D-ECAP model and computing by the UMAT. After that, we canachieve the distribution of the crystal orientation. By using the Matlab-MTEX toolbox,the pole figure and ODF are created.The different texture types are obtained in different position of sample, which hasthe random orientation before120°ECAP. The simulation result show thathomogeneity is found between upside and middle part of the sample. As a differentconsequence, inhomogeneity is found between middle part and upside. The Miller indexshow that the main shear deformation texture is the prismatic texture after ECAP andlittle pyramid texture after120°ECAP. It also can obtained from ideal shear texturewith a60degree rotation of φ1in120°ECAP. The initial texture will not became weakuntil pressing, but deformation texture will be stronger than it. Pyramid texture maybe generate because of the decrese of degree of channel. It will let the deformation be hardto continual as a result that a stress concentration aroused twinning deformation, and thetwinning deformation caused the pyramid texture.