Abstract: Anisotropy of mechanical properties is one of the major factors affecting the formability of commercial pure titanium sheet and strip. In order to fabricate commercial pure titanium coil with low anisotropy, the mechanical properties, microstructure and texture of cold rolled commercial pure titanium after annealing with different parameters were characterized by using room temperature tensile tests and EBSD technique. And the influence of annealing process on anisotropy of mechanical properties of commercial pure titanium coil was analyzed. The results show that at fixed annealing temperature, with prolonging annealing time, the yield strength of TA1 strip in rolling direction (RD) descends more rapidly than that in transverse direction (TD), resulting in the increase of anisotropy of mechanical properties . When annealing arrived at a certain duration, the anisotropy of mechanical properties tends to be stable. The stable value of difference in yield strength between RD and TD is 82 MPa when annealed at 700 ℃, but it becomes 58 MPa at 610 ℃. For fixed annealing time, the higher the annealing temperature, the higher the anisotropy of mechanical properties, within the study temperature range. Texture analysis indicates that with prolonging annealing time or/and increasing annealing temperature, the intensity of pyramid texture increases, while that of the basal texture decreases, which leads to the increase of the difference in Schmid factor for {1010}<1120> prismatic slip between RD and TD when stretched at room temperature, therefore causes more obvious anisotropy of mechanical properties.

Key words: commercial pure titanium, coil, annealing schedule, texture, anisotropy