The texture evolution behavior and its triggered mechanical anisotropy of commercially pure titanium (CP Ti) during severe cold rolling and subsequent annealing are discussed based on the optical microscopy and the electron backscattered diffraction analyses. Some enlightening results are found. It is shown that planar textures exist under all treatments, namely the {11–29}<10–10> under rolling state, the {11–27}<10–10> under 300 °C annealing state and the {11–24}<10–10> under 500 °C annealing state. This indicates that the crystal plane indices of planar texture change toward {− 12–10} with increasing annealing temperature, which is a result of crystal lattice rotation. Planar texture triggers anisotropy of the mechanical properties for CP Ti sheets under all treatments. In particular, CP Ti sheets exhibit severe and similar anisotropy behavior under rolling and 300 °C annealing states. Generally speaking, the rolling direction (RD) specimens get relatively low yield strength, high ultimate tensile strength and good plasticity, and RD + 45° specimens show relatively high yield strength, low ultimate tensile strength and good plasticity. The transverse direction specimens, however, usually exhibit high yield strength and low plasticity. It is proved that the above anisotropy behavior is mainly determined by the Schmid factor distribution of the (10–10)[11–20] prismatic slip system in different directions. Due to the non-negligible influence exerted by the (0001)[11–20] basal slip system after 500 °C annealing, the anisotropy behavior under this state is obviously different.

中文翻译：

---

剧烈冷轧和随后退火过程中CP Ti的织构演变行为及其触发的机械各向异性

基于光学显微镜和电子背散射衍射分析，讨论了商业纯钛（CP Ti）在剧烈冷轧和随后的退火过程中的织构演变行为及其触发的机械各向异性。发现了一些启发性的结果。结果表明，在所有处理下均存在平面织构，即轧制状态下的{11-29} <10-10>，300°C退火状态下的{11-27} <10-10>和{11-24 } <10–10>在500°C退火状态下。这表明，随着晶格旋转，平面织构的晶面指数随着退火温度的升高而向{− 12-10}方向变化。在所有处理下，平面织构均会触发CP Ti板的机械性能各向异性。尤其是，CP Ti板在轧制和300°C退火状态下表现出严重且相似的各向异性行为。一般而言，轧制方向（RD）试样的屈服强度相对较低，极限抗拉强度较高，并且塑性良好，而RD + 45°试样的屈服强度较高，极限抗拉强度较低，塑性很好。然而，横向样品通常表现出高屈服强度和低可塑性。证明上述各向异性行为主要由（10–10）[11–20]棱镜滑动系统在不同方向上的Schmid因子分布决定。由于（0001）[11–20]基层滑移系统在500°C退火后所产生的不可忽略的影响，这种状态下的各向异性行为明显不同。