Abstract
The microstructural, textural, and hardness evolution of a cold-rolled high-purity Ti sheet (50 pct reduction in thickness) during isochronal annealing at 350 °C to 550 °C was investigated by jointly using electron backscatter diffraction, electron channel contrast imaging, X-ray diffraction, and hardness test, with a dedicated correlation analysis between them performed. Results show that recrystallization nucleation starts at 400 °C with prior grain boundaries as preferential sites while fully recrystallized structures were obtained after annealing at 550 °C for 1 hours. During the primary recrystallization, contrary to earlier reports, considerable textural changes occur: the prior bimodal basal texture characteristic is essentially replaced by a ring-like basal texture. Such a textural change is attributed to the orientation-gradient-related subgrain coalescence mechanism that dominates the recrystallization nucleation of the high-purity Ti sheet. Specimen hardness always decreases with increasing the annealing temperature (from 234.3 ± 5.8 to 135.9 ± 2.9 HV), which is closely related to continuous variations of grain sizes and dislocation densities (mainly stored in low-angle boundaries). Quantitative analyses reveal that both grain sizes and dislocation densities have mild effects on the hardness change when annealed below 450 °C. However, the decrease in dislocation density leads to more significant softening than grain coarsening when the annealing temperature exceeds 450 °C.
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Acknowledgments
This work was financially supported by the Postdoctoral Science Foundation of China (2021M690174), the Graduate Student Innovation Program of Chongqing University of Technology (CLGYCX20202003), the Open Foundation of Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials at Guangxi University (2021GXYSOF06), the National Natural Science Foundation of China (52171052 and 51901193), and the Sichuan Science and Technology Program (2020ZDZX0017-3).
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Hu, X., Chai, L., Shen, J. et al. Microstructure, Texture, and Hardness Evolution of Cold-Rolled High-Purity Ti Sheet During Annealing at 350 °C to 550 °C. Metall Mater Trans A 53, 2086–2098 (2022). https://doi.org/10.1007/s11661-022-06651-z
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DOI: https://doi.org/10.1007/s11661-022-06651-z