Texture Analysis of Commercial Pure (Grade 3) Ti after Two-Step Severe Plastic Deformation

摘要

Ultrafine-grained (UFG) commercial pure (CP, grade 3) Ti was produced by two-step severe plastic deformation (eight-pass equal channel angular extrusion (ECAE) at 400 °C and cold rolling (CR) at room temperature (RT)). The crystallographic texture in UFG CP-Ti and coarse-grained (CG) CP-Ti (annealed) after CR at RT are studied by orientation distribution function (ODF) analysis, based on X-ray diffraction. The relationship between the texture components and mechanical properties of UFG CP-Ti after two-step severe plastic deformation (SPD) has been discussed. ODF analysis shows that the main texture components in UFG Ti after CR at RT are (0115)[11 01], (0115)[2201], (0001)[1343] and (0113)[2111], while the texture components of (0113)[110l] and (0113)[2201] appear in CG CP-Ti after CR at RT. The values of Schmid factor for prismatic- slip systems are larger than that for basal slip systems and other slip systems, which is more in favor of the activation of prismatic-. In addition, higher strength of texture in favor of the activation of prismatic- in UFG CP-Ti improves its plasticity.