Texture evolution during multi-pass cold rolling and annealing of Ti-2Al-1.5Mn alloy

Abstract

In this contribution, the underlying mechanisms of microstructure evolution and texture development during the cold rolling and annealing of a Ti-2Al-1.5Mn alloy were investigated and elucidated comprehensively. As a result of the heightened dislocation density and grain boundary, the hardness ascended as the successive reductions applied. However, the annealing treatment reinstated the structure through complete recrystallization. During cold working, the dominant basal <a> and prismatic <a> glide inclined the c-axis and <101̅0> axis towards the compressive direction and the rolling direction (RD), respectively. The primary rolled orientation consisted of <101̅0> fiber, the orientation of {1̅21̅3}<101̅0> with Euler angle {10°, 45°, 0°}and {1̅21̅7}<101̅0> with Euler angle {5°, 25°, 0 °} were predominant. Schmid Factor (SF) analysis and orientation rotation related to various textures demonstrated that basal <a> slipping resulted in a descendingϕangle in the Bunge system and <101̅0> pole parallel to the RD was the stable orientation. It was revealed that the recrystallized grains preponderantly exhibited textures inherited from the rolled matrix, but a new T-type texture also emerged. This implies that both the strain-induced boundary migration (SIBM) mechanism and selective grain growth, which nucleates at different sites, manipulate the annealing process. The study enhances our comprehension of texture evolution mechanisms involved in the plastic forming and helps ascertain the most effective operational parameters for producing high-performance titanium plates.