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Characteristics of High-Temperature Deformation Behavior of Ti-45Al-2Cr-3Ta-0.5W Alloy

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Abstract

High-temperature deformation behavior tests of as-cast Ti-45Al-2Cr-3Ta-0.5W alloy were conducted over a wide range of strain rates (0.001-1.0 s−1) and temperatures (1150-1300 °C). The flow curves for the current alloy exhibited sharp peaks at low strain levels, followed by pronounced work hardening and flow localization at high strain levels. Phenomenological analysis of the strain rate and temperature dependence of peak stress data yielded an average value of the strain rate sensitivity equal to 0.25 and an apparent activation energy of ~420 kJ/mol. Processing maps were established under different deformation conditions, and the optimal condition for hot work on this material was determined to be 1250 °C/0.001 s−1. The stable deformation region was also found to decrease with increasing strain. Dynamic recrystallization (DRX) was the major softening mechanism controlling the growth of grains at the grain boundary. Meanwhile, local globularization and dynamic recovery (DR) were the main softening mechanisms in the lamellar colony. When deformed at higher temperatures (~1300 °C), the cyclic DRX and DR appeared to dominate the deformation. Moreover, the evolution of the β phase during hot deformation played an important role in the dynamic softening of the alloy.

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Acknowledgments

This research was sponsored by the Natural Science Foundation of China (Nos. 51201138 and 51301140). The author would like to thank Dr. L. Li in Northwest Institute for Nonferrous Metal Research for providing the hot compression.

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

    Y. Y. Luo, Z. P. Xi & W. D. Zeng

  2. Northwest Institute for Nonferrous Metal Research, Xi’an, 710016, China

    Y. Y. Luo, X. N. Mao, Y. L. Yang & H. Z. Niu

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  1. Y. Y. Luo
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Luo, Y.Y., Xi, Z.P., Zeng, W.D. et al. Characteristics of High-Temperature Deformation Behavior of Ti-45Al-2Cr-3Ta-0.5W Alloy. J. of Materi Eng and Perform 23, 3577–3585 (2014). https://doi.org/10.1007/s11665-014-1175-5

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