Materials Science Forum Vol. 1196

Abstract: This study investigates the hot deformation behavior of a near-β TC18 titanium alloy at 750 °C, with a focus on the interplay between dynamic softening mechanisms and α/β phase transformation. Compression tests were conducted at varying strain rates (0.01–1 s^-1) and true strains (40% to 80%). The results show that increasing strain rate and deformation promote dislocation accumulation, which leads to enhanced stored energy. This drives a transform from dynamic recovery (DRV) to dynamic recrystallization (DRX) as the dominant softening mechanism and concurrently accelerates dynamic phase transformation. Meanwhile, intensified α-phase spheroidization is also observed.The strong coupling between DRX and phase transformation contributes to microstructural refinement, ultimately improving mechanical properties by balancing strength and ductility. These findings provide new insights into deformation mechanisms and offer guidance for optimizing thermomechanical processing of near-β titanium alloys.