Abstract
The influence of microstructure on slip irreversibility and crack initiation during high-cycle fatigue of a titanium alloy has been explored. The results indicate that the fatigue strength of lamellar microstructure is higher than the bimodal microstructure. The underlying microstructure and strain partition below the fatigue crack origins have been revealed through electron backscattered diffraction (EBSD). Furthermore, the slip irreversibility and the corresponding accumulative strain to fracture were calculated and compared for these two microstructures. Finally, a critical parameter about (8.1 ± 2) × 10–4·μm−2 for fatigue crack initiation was achieved with the present titanium alloy, which was found to be independent of microstructural types.
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Acknowledgements
This project was financially supported by the Natural Science Basic Research Program of Shaanxi (Program No. 2020JQ-618), the National Natural Science Foundation of China (51671158, 51621063), 973 Program of China (2014CB644003) and Xi’an University of Technology (101-256081814).
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QY. Sun designed and supervised the project. CS. Tan performed the experiments and data analysis and wrote the paper. GJ. Zhang provided valuable comments and suggestions for this paper. YQ. Zhao provided the original materials and valuable comments as well as suggestions for the work. All authors contributed to discussions of the results.
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Tan, C., Sun, Q., Zhang, G. et al. High-cycle fatigue of a titanium alloy: the role of microstructure in slip irreversibility and crack initiation. J Mater Sci 55, 12476–12487 (2020). https://doi.org/10.1007/s10853-020-04845-7
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DOI: https://doi.org/10.1007/s10853-020-04845-7