Asynchronous Spheroidization of the Lamellar Structure in a Near-α Ti Alloy

This communication reports a commendable grain refinement in a near- \(\alpha \) $\alpha$ Ti alloy through the asynchronous spheroidization of the lamellar structure. Heterogeneous microstructural defects, caused by the \(\beta \to \alpha \) $\beta \to \alpha$ phase transformation, lead to the preferential geometric dynamic recrystallization in the thin secondary \(\alpha \) $\alpha$ grains. As deformation progresses, the resulting mixed-grain structure effectively facilitates the deformation and subsequent discontinuous dynamic recrystallization of the coarse grain boundary \(\alpha \) $\alpha$ grains. These findings highlight the potential for optimizing grain refinement processes in near- \(\alpha \) $\alpha$ Ti alloys, offering insights for enhancing their mechanical performance in demanding applications.