Abstract
? 2022 Elsevier B.V.Microstructure evolution during “abc” deformation of commercial-purity titanium was investigated. Continuous dynamic recrystallization (CDRX) played a dominant role in the microstructural changes, although mechanical twinning also contributed to some extent. It was found that CDRX developed preferentially at the original grain boundaries, thus resulting in a necklace-type microstructure. This effect was attributed to the comparatively-high local stresses in these areas, which promoted pyramidal<c+a>slip and thus enhanced evolution of deformation-induced boundaries. It was also established that changes in strain path resulted in a noticeable re-organization of the pre-existing dislocation structure due to a Bauschinger Effect and thus promoted essential material softening. This phenomenon retarded the evolution of dislocation boundaries and thus tended to lead to stagnation in microstructure refinement.
NSTL
Elsevier