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Constitutive Behavior and Hot Workability of a Hot Isostatic Pressed Ti-22Al-25Nb Alloy during Hot Compression

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Abstract

A Ti-22Al-25Nb alloy was fabricated from prealloyed powders by hot isostatic pressing for 2 h at a temperature of 1050 °C and pressure of 100 MPa. The hot deformation behavior of the Ti-22Al-25Nb alloy was characterized by isothermal compression testing at deformation temperatures between 900 and 1060 °C and strain rates between 0.001 and 1 s−1. Based on the true stress–strain curves, a constitutive equation was constructed to describe the flow stress as a function of the strain rate and deformation temperature. Three-dimensional (3D) processing maps were developed based on dynamic material model theory using the stress flow data to identify the instability and optimization regions of the hot processing parameters. The results show that the flow stress decreases with increasing deformation temperature and decreasing strain rate, and the softening mechanisms are different under different deformation conditions. The apparent activation energies in the (α2 + β/B2 + O) and (α2 + B2) phase regions are calculated to be 865.177 and 590.661 kJ/mol, respectively, which suggests that the hot isostatic pressed (HIPed) Ti-22Al-25Nb alloy requires a high hot deformation activation energy. Combined with microstructural observations, the optimal processing domains are determined to be a temperature range of 1030-1060 °C and strain rate range of 0.01-0.1 s−1 in the α2 + B2 phase region. Moreover, the results indicate that adiabatic shear bands and severe inhomogeneous deformation cause flow instability at lower temperatures (900-1005 °C) and higher strain rates (> 0.1 s−1).

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Acknowledgments

The authors express their appreciation for the financial support of National Natural Science Foundation of China under Grant Nos. 51875121 and 51905122, Plan of Key Research and Development in Shandong Province under Grant Nos. 2017GGX202006 and 2019GGX102046, Natural Science Foundation in Shandong Province under Grant No. ZR2019MEE039.

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Authors and Affiliations

  1. Department of Civil Engineering, Harbin Institute of Technology, Weihai, 264209, China

    Hongming Zhang & Mingqian Yang

  2. School of Materials Science and Engineering, Harbin Institute of Technology, Weihai, 264209, China

    Yuan Xu, Gang Chen & Fei Han

  3. John Deere (Tianjin) Works, Tianjin, 300457, China

    Cheng Sun

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Zhang, H., Yang, M., Xu, Y. et al. Constitutive Behavior and Hot Workability of a Hot Isostatic Pressed Ti-22Al-25Nb Alloy during Hot Compression. J. of Materi Eng and Perform 28, 6816–6826 (2019). https://doi.org/10.1007/s11665-019-04453-w

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