Development of Cold-Rolling Textures in Pure Ti

Abstract

Hot bands of pure Ti, obtained with thermomechanical processing, were cold-rolled up to 90% reduction in thickness, and the development of the cold-rolling texture was investigated in detail with the crystallite orientation distribution function analysis. Through the thermomechanical processing, which consisted of 97.5% hot rolling at 700deg C, followed by annealing for 1 h at the same temperature, a strong {l brace}1013{r brace} recrystallization texture wad developed in these hot bands. This texture was quite unstable during cold-rolling, so that it was considerably weakened after 30% cold-rolling. This texture change was caused mainly by extensive twinning which was followed by slip rotations. At rolling reductions between 30 and 50%, a basal texture having its center at the {l brace}0001{r brace} orientation was developed remarkably. To this texture change, slip rotations contributed much more than twinning. At rolling reductions above 50%, deformation by slip induced this {l brace}0001{r brace} orientation to rotate about its axis lying parallel to the rolling direction toward the {l brace}2115{r brace} orientation. This rotation was terminated at the {l brace}2115{r brace} orientation, and at rolling reductions above 80%, the {l brace}2115{r brace} orientation become the stable end orientation of the cold-rolling texture. (orig.).