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Microstructure Evolution and Mechanical Properties of cp-Ti Processed by a Novel Technique of Rotational Constrained Bending

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Abstract

In this study, a novel severe plastic deformation technique referred to as rotational constrained bending (RCB) is introduced. A special constrained bending die, which imposes bending deformation to the billet during the first pass, was developed for repetitive processing of pre-extruded commercially pure Ti. Strain-induced microstructural changes were investigated by a special technique of automated crystal orientation mapping in TEM simultaneously with advanced X-ray line profile analysis. Plastic deformation distribution, imposed to the billets after a selected number of passes, was followed by precise microhardness mapping. Exceptional microstructure refinement was attained by the application of repetitive bending deformation. Average grain size decreased down to 400 nm, and the dislocation density increased by about 35 pct after ten passes. X-ray macrotexture measurements revealed the formation of a basal slip texture component commonly observed in HCP materials processed by equal channel angular pressing; however, exceeding four passes, a strong \( \left\{ {11{\bar{2}}0} \right\} \) fiber texture started to form. Mechanical testing in tension showed a significant increase in strength in the RCB-processed samples. The proof-stress and tensile strength increased by 30 and 15 pct after four passes, respectively. At a higher number of passes, the proof stress slightly decreased because of the texture softening.

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Acknowledgments

This work was financially supported by the Ministry of Education, Youth and Sports of the Czech Republic under the project LTARF18010 and by the Ministry of Science and Higher Education of the Russian Federation under grant agreement no. 14.586.21.0059 (UIN: RFMEFI58618X0059). Partial financial support by ERDF project no. CZ.02.1.01/0.0/0.0/15_003/0000485 is also gratefully acknowledged. This work was supported in part by the Ministry of Human Capacities of Hungary within the ELTE University Excellence program (1783-3/2018/FEKUTSRAT).

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Authors and Affiliations

  1. Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16, Praha 2, Czech Republic

    T. Krajňák, M. Janeček, P. Minárik, J. Veselý, P. Cejpek, D. Preisler & F. Nový

  2. Department of Materials Physics, Eötvös Loránd University, P.O.B. 32, Budapest, 1518, Hungary

    J. Gubicza & P. T. Hung

  3. Ufa State Aviation Technical University, 12 K. Marx str, Ufa, 450008, Russian Federation

    A. G. Raab, G. I. Raab & R. Asfandiyarov

  4. Institute of Molecule and Crystal Physics, UFRC RAS, 151 pr. Oktyabrya, Ufa, 450075, Russian Federation

    R. Asfandiyarov

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  1. T. Krajňák
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Correspondence to T. Krajňák.

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Manuscript submitted August 26, 2020, January 7, 2021.

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Krajňák, T., Janeček, M., Minárik, P. et al. Microstructure Evolution and Mechanical Properties of cp-Ti Processed by a Novel Technique of Rotational Constrained Bending. Metall Mater Trans A 52, 1665–1678 (2021). https://doi.org/10.1007/s11661-021-06157-0

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