The unusual character of microstructure evolution during ?abc? deformation of commercial-purity titanium

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. (c) 2022 Elsevier B.V. All rights reserved.

Automated summary

Microstructure evolution during abc deformation of commercial-purity titanium were investigated, and it was found that continuous dynamic recrystallization played a dominant role in the microstructural changes. CDRX developed preferentially at the original grain boundaries, resulting in a necklace-type microstructure. Changes in strain path led to re-organization of the pre-existing dislocation structure and essential material softening. These findings are important for understanding and controlling the microstructure of titanium materials.