Abstract
Ti-37 at pct Nb alloy has been successfully applied to engineering fields because of its excellent superconductivity and perfect ductility. The TiNb alloy is necessary to optimize hot processing parameters and further investigate hot workability. Consequently, a processing map of TiNb alloy is constructed based on dynamic material modeling via stress–strain curves at 700 °C to 1000 °C and 0.0005 to 0.5 s−1. The results show that one appropriate working domain is where the temperature range is about 765 °C to 910 °C and the strain rate is simultaneously < 0.0007 s−1, and another appropriate working domain is where the temperature range is about 960 °C to 1000 °C and simultaneously the strain rate range is about 0.002 to 0.1 s−1. Microstructures of TiNb samples, which are deformed in the instability processing domain with the high strain rate of 0.5 s−1, are further characterized to reveal dependence of the processing map on microstructures, and thus it is found that dynamic recovery and incomplete dynamic recrystallization cannot effectively improve the heterogeneous microstructure of TiNb alloy samples during deformation under a high strain rate. In addition, θ- and γ-fiber textures are found in the deformed TiNb specimens, and high deformation temperature contributes to the formation of the θ-fiber texture.
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This work was supported by the National Natural Science Foundation of China (Nos. 51475101 and 51871070).
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Manuscript submitted January 27, 2021; accepted March 26, 2021.
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Sun, D., Zhang, Y., Jiang, S. et al. Investigation on Hot Workability of Ti-37 At Pct Nb Alloy Based on Processing Map and Microstructural Evolution. Metall Mater Trans A 52, 2830–2844 (2021). https://doi.org/10.1007/s11661-021-06276-8
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DOI: https://doi.org/10.1007/s11661-021-06276-8