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Ultrafine-grained Ti–Nb–Ta–Zr alloy produced by ECAP at room temperature

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Abstract

To ascertain the influence of severe plastic deformation (SPD) on a Ti–Nb–Ta–Zr (TNTZ) alloy, we studied the room temperature mechanical behavior and microstructural evolution of an ultrafine-grained (UFG) Ti–36Nb–2Ta–3Zr (wt%) alloy prepared via equal-channel angular pressing (ECAP) of the as-hot-extruded alloy. The tensile behavior, phase composition, grain size, preferred orientation, and dislocation density of the UFG alloy, processed under different conditions, were analyzed and discussed. Compared to the as-hot-extruded alloy, the ECAP-processed TNTZ alloy (3 passes) exhibited approximately 40 and 88 % increase in average ultimate strength and yield strength, respectively. Moreover, as the number of ECAP passes increased from 3 to 6, the TNTZ alloy exhibited not only the expected increase in ultimate and yield strength values, but also a slight increase in elongation. Our results suggest that the deformation mechanisms that govern the behavior of the as-hot-extruded coarse grained (CG) TNTZ alloy during ECAP involve a combination of stress-induced martensitic transformation and dislocation activity. In the case of the ECAP-processed UFG TNTZ alloy, the deformation mechanism is proposed to involve two components: first, dislocation activity induced by the strain field imposed during ECAP; and second, the formation of α″ martensite phase during the early stages of ECAP which eventually transforms into β phase during continued deformation. We propose that the deformation mechanism governing the room temperature behavior of the TNTZ alloy strongly depends on the grain size of the β phase.

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Acknowledgements

The financial support from the US National Science Foundation (NSF DMR-1210437) is gratefully appreciated. For RZV, this project was partially supported by the Russian Federal Ministry for Education and Science (Contract No. 14.B25.31.0017). The author (ZL) would like to thank the financial support from the China Scholarship Council (No. 201306230030).

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Authors and Affiliations

  1. Department of Chemical Engineering and Materials Science, University of California, Davis, CA, 95616, USA

    Zhiming Li, Baolong Zheng, Yitian Wang, Troy Topping, Yizhang Zhou & Enrique J. Lavernia

  2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Zhiming Li & Aidang Shan

  3. Department of Mechanical Engineering, California State University, Sacramento, CA, 95819, USA

    Troy Topping

  4. Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, Ufa, 450000, Russia

    Ruslan Z. Valiev

  5. Laboratory for Mechanics of Bulk Nanostructured Materials, Saint Petersburg State University, Saint Petersburg, 198504, Russia

    Ruslan Z. Valiev

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  1. Zhiming Li
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  2. Baolong Zheng
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  3. Yitian Wang
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  4. Troy Topping
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Correspondence to Zhiming Li or Enrique J. Lavernia.

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Li, Z., Zheng, B., Wang, Y. et al. Ultrafine-grained Ti–Nb–Ta–Zr alloy produced by ECAP at room temperature. J Mater Sci 49, 6656–6666 (2014). https://doi.org/10.1007/s10853-014-8337-6

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  • DOI: https://doi.org/10.1007/s10853-014-8337-6

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