Microstructure and texture evolution of pure Titanium sheet during cold rolling and annealing process

Abstract

In this study, the microstructure and texture evolution of pure titanium sheets under different cold rolling reduction (20%-80%) and annealing time (10–60 min) were systematically analyzed, and the mechanism of plastic deformation and static recrystallization (SRX) was revealed. The results show that: In the process of plastic deformation, 20%-40% reduction is dominated by {11-22}<11-2-3> compression twins and {10-12}<10-1-1> tensile twins, which coordinate plastic deformation and refine grains. When the reduction is 40–60%, it gradually changes to dislocation slip. At 60–80%, it is dominated by dislocation slip, and the lattice rotation forms a strong TD splitting texture. In the process of static recrystallization, the nucleation of non-basal oriented grains in the twinning zone is dominated by 20–40% reduction. With the increase of deformation, the grains form off-basal oriented grains by grain boundary migration. The generation of non-basal grains leads to the dispersion distribution of texture, and the generation of off-basal grains re-forms a strong TD splitting texture. At 80% high reduction, with the increase of annealing time, the non-basal grains with high grain boundary mobility shrink inward and disappear, and the off-basal grains grow and form a stable structure.