Abstract
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.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Grant No. 51801132), the China Scholarship Council (CSC NO.201906935013) for X.H. Shi, the School Foundation of Taiyuan University of Technology (Grant No. 2017QN02) and the National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering (No. 61420050204).
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Shi, X., Cao, Z., Fan, Z. et al. Texture Evolution Behavior and Its Triggered Mechanical Anisotropy of CP Ti During Severe Cold Rolling and Subsequent Annealing. Acta Metall. Sin. (Engl. Lett.) 33, 1271–1282 (2020). https://doi.org/10.1007/s40195-020-01047-7
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DOI: https://doi.org/10.1007/s40195-020-01047-7