Microstructure and texture of commercially pure titanium in cold deep drawing

The development of microstructure and texture during cold deep drawing of commercially pure titanium (CP-Ti) was investigated. Three parts, stretching region, drawing region and flange region, were sequentially formed in the deep drawing process of the hemispheric surface part, with reference to deformation modes and strain regimes. Results show that the plastic strain is accommodated by dislocation slip and deformation twinning in the whole deep drawing process. The texture of the CP-Ti sheet and its drawn part consists of rolling texture component and recrystallization texture component. The intensity and type of the initial texture varied during the drawing process are related to the production of deformation twinning and dislocation slip. Twinning weakens the initial texture by randomizing the orientations of crystals, especially for the recrystallization texture. The recrystallization texture in the drawing region disappears due to the significant forming of twinning. Furthermore, over drawing would result in the predominance of dislocation slip and the texture is strengthened.