Research on the anisotropy of plastic behavior and deformation mechanism of textured pure titanium

The anisotropy of the plastic behavior and the associated deformation mechanism of textured pure titanium were studied using uniaxial tensile tests with different strain rates along the rolling direction (RD), 45 degrees direction (BD), and tangential direction (TD), and combined with crystal orientation observation and Schmid law analysis. The experimental results show that the yield and hardening behaviors of textured pure titanium exhibit an obvious strain rate effect and anisotropy, with TD exhibiting a three stage characteristic, RD exhibiting continuous variation, and BD falling somewhere in between. According to the Schmid law and critical shear stress (CRSS) analysis, the RD tensile yield mechanism is prismatic slip, whereas the BD and TD tensile yield mechanisms are the result of the combined action of two or more slip systems. Twinning polarity and Schmid law both have an effect on twinning activation, and the new texture component 0001//RD generated by {10-12} extension twinning is beneficial to prismatic slip and pyramidal slip activation. The combined effects of twinning-induced grain refinement strengthening, texture softening, and strain softening jointly affect the ma-terial hardening and softening behavior.

Automated summary

The plastic behavior and deformation mechanism of textured pure titanium were studied using uniaxial tensile tests, crystal orientation observation, and Schmid law analysis. The results show that there is an obvious strain rate effect and anisotropy in the yield and hardening behaviors of the material. The study also reveals that different tensile directions have different yield mechanisms, and both twinning polarity and Schmid law have an effect on twinning activation.