The texture evolution related to the interactions between α and β phases in dual-phase region annealing of a near α titanium alloy pipe after Pilger cold rolling

This work focused on the texture evolution related to the interactions between α phases and β phases for a Ti80 Pilger cold rolling pipe during dual-phase region annealing of 1223 K, 1243 K and 1263 K. The key observation was that the annealing temperature significantly affected the components and intensities of the texture. At 1223 K, the main factor affecting the texture evolution was the globularization of the primary α phases (α_P), and the globularization of α_P was greatly influenced by the crystallographic orientation in reference to the loading direction during cold rolling. Those globularized α_P maintaining the Burgers orientation relationship (BOR) with the residual β phases were more prone to growing up. At 1243 K, more α_P were dissolved and residual β phases grew up accompanying by the precipitation of more secondary α phases (α_S). The texture was closely related to the preferential growth of the β phase due to the same crystallographic orientation of α_S with adjacent α_P grains. Those β phases suffering little deformation during the cold rolling were more likely to grow up since the initial volume advantage and the maintaining of BOR with α_P. The β phases undergoing larger deformation would be pinned by α_P during the growing up, which was attributed to the recrystallization of β phases and the broken of BOR with α_P. At the annealing temperature of 1263 K, the degree of variants selection (DVS) of α_S was significantly reduced due to the dissolution of abundant α_P during β→α_S transformation, thus the texture intensities were reduced.