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Construction of Constitutive Model and Strain-Rate Sensitivity Coefficient Distribution Map of Ti2AlNb

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Abstract

The hot deformation behavior of Ti–22Al–25Nb was studied by the high temperature compression over a range of temperatures (950–1050 °C) and strain rates (0.001–10 s−1) in this paper. The work-hardening (WH) and softening deformation behaviors of Ti–22Al–25Nb were analyzed. Obvious linear decreasing regimes of WH rate curves can be found before the dynamic recrystallization (DRX) onset, which indicates WH + DRV (dynamic recovery) stage. And WH rate decreased significantly with strain rate reduced and temperature elevated. A physically-based constitutive model was established, which can well predict the flow behavior of Ti–22Al–25Nb. Additional, strain-rate sensitivity coefficient distribution map was established. The higher values of m appeared at the low strain rate. When the strain rate exceeded 0.1 s−1, the values of m were lower than 0.25.

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Acknowledgements

The work was supported by National Natural Science Foundation of China (Grant No. 51805442).

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China

    Yongqiang Zhang & Xiangyi Xue

  2. Northwest Institute for Non-ferrous Metal Research, Xi’an, 710016, China

    Yongqiang Zhang, Jingli Zhang, Shewei Xin, Hao Pan & Huamei Sun

  3. School of materials science and engineering, Northeastern University, Shenyang, 110819, China

    Huiming Li

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  1. Yongqiang Zhang
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Zhang, Y., Xue, X., Zhang, J. et al. Construction of Constitutive Model and Strain-Rate Sensitivity Coefficient Distribution Map of Ti2AlNb. Met. Mater. Int. 27, 1988–1996 (2021). https://doi.org/10.1007/s12540-020-00645-5

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  • DOI: https://doi.org/10.1007/s12540-020-00645-5

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