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Hot deformation behavior of Ti-22Al-25Nb alloy by processing maps and kinetic analysis

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Abstract

To study the hot deformation behavior of the Ti-22Al-25Nb alloy, isothermal compression tests were conducted at the temperature range of 930–1080 °C with strain rates of 0.001–1.0 s−1. Both the strain rate and the deformation temperature have a significant influence on the stress–strain behavior of the Ti-22Al-25Nb alloy. A hyperbolic–sine constitutive equation is established to quantitatively demonstrate the relationship between the parameters involved, and the hot deformation activation energy Q is determined as 621 kJ/mol. To optimize the processing window, a hot processing map is established, which is related to the microstructure evolution in hot working. The lamellar globularization as well as the dynamic recrystallization (DRX) would contribute to the stable regions with high power dissipation, while the adiabatic shear bands would lead to unstable regions. Moreover, an Avrami-type kinetics model is applied to examine the evolution of DRX during isothermal deformation process.

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ACKNOWLEDGMENTS

The authors are grateful to the China National Funds for Distinguished Young Scientists (granted No. 51325401, and the National Natural Science Foundation of China (Granted No. 51302186)), the National High Technology Research and Development Program of China (Granted No. 2015AA042504) for grant and financial support.

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Authors and Affiliations

  1. State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin, 300354, People’s Republic of China

    He Zhang, Huijun Li, Qianyin Guo, Yongchang Liu & Liming Yu

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  1. He Zhang
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  2. Huijun Li
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  4. Yongchang Liu
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Correspondence to Yongchang Liu.

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Zhang, H., Li, H., Guo, Q. et al. Hot deformation behavior of Ti-22Al-25Nb alloy by processing maps and kinetic analysis. Journal of Materials Research 31, 1764–1772 (2016). https://doi.org/10.1557/jmr.2016.188

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  • DOI: https://doi.org/10.1557/jmr.2016.188

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