화학공학소재연구정보센터
Materials Science Forum, Vol.467-470, 1211-1215, 2004
Microstructure and texture evolution during continuous dynamic recrystallization at warm deformation of titanium.
The microstructure and texture evolutions in pure titanium during severe plastic deformation at T=400degreesC were investigated. Compressive deformation of prismatic samples was sequentially applied in three orthogonal directions up to 12 steps and a strain at each step of 40%. A radical microstructure refinement (from 20 to 0.2 mum) during strain has been found. The features of the deformation structure are a high level of internal stresses, high density of dislocations, a large number of deformation induced boundaries and the presence of twins. It is shown that during strain there is a significant change in disorientation angles and axes of individual high angle grain boundaries. At the same time the total set of high angle boundaries - Misorientation Distribution Function (MDF) and texture - does not change significantly with strain. The reasons for the change in disorientation angles and axes at new deformation-induced boundaries during plastic flow are discussed.