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Effect of severe plastic deformation on creep behaviour of a Ti–6Al–4V alloy

  • Nanostructured Materials
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Abstract

This paper examines the effect of severe plastic deformation on creep behaviour of a Ti–6Al–4V alloy. The processed material with an ultrafine-grained (UFG) structure (d ≈ 150 nm) was prepared by multiaxial forging. Uniaxial constant stress compression and constant load tensile creep tests were performed at 648–698 K and at stresses ranging between 300 and 600 MPa on the UFG processed alloy and, for comparison purposes, on its coarse-grained (CG) state. The values of the stress exponents of the minimum creep rate n and creep activation energy Q c were determined. Creep behaviour was also investigated by nanoindentation method at room temperature under constant load. The microstructure was examined by transmission electron microscopy and scanning electron microscope equipped with an electron back scatter diffraction unit. The results of the uniaxial creep tests showed that the minimum creep rates of the UFG specimens are significantly higher in comparison with those of the CG state. However, the differences in the minimum creep rates of both states of alloy strongly decrease with increasing values of applied stress. The CG alloy exhibits better creep resistance than the UFG one over the stress range used; the minimum creep rate for the UFG alloy is about one to two orders of magnitude higher than that of the CG alloy. The indentation creep tests showed that annealing had little effect on the creep behaviour in UFG Ti alloy at room temperature.

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Acknowledgements

Financial support for this work was provided by the Czech Science Foundation under Grant 108/10/P469 and by CEITEC—Central European Institute of Technology with research infrastructure supported by the project CZ.1.05/1.1.00/02.0068 financed from European Regional Development Fund. S. Zherebtsov was supported by the Federal Agency for Education, Russia; Grant #14.A18.21.1637. We thank Prof. W. Blum for helpful discussion and exchange of ideas.

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Authors and Affiliations

  1. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žižkova 22, 616 62, Brno, Czech Republic

    Petr Kral, Jiri Dvorak, Marie Kvapilova & Vaclav Sklenicka

  2. CEITEC—IPM, Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Zizkova 22, 616 62, Brno, Czech Republic

    Jiri Dvorak, Marie Kvapilova & Vaclav Sklenicka

  3. Laboratory of Bulk Nanostructured Materials, Belgorod State University, Pobeda Str. 85, 308015, Belgorod, Russia

    Sergey Zherebtsov & Gennady Salishchev

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  1. Petr Kral
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  2. Jiri Dvorak
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  3. Sergey Zherebtsov
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  4. Gennady Salishchev
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  5. Marie Kvapilova
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  6. Vaclav Sklenicka
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Correspondence to Petr Kral.

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Kral, P., Dvorak, J., Zherebtsov, S. et al. Effect of severe plastic deformation on creep behaviour of a Ti–6Al–4V alloy. J Mater Sci 48, 4789–4795 (2013). https://doi.org/10.1007/s10853-013-7160-9

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  • DOI: https://doi.org/10.1007/s10853-013-7160-9

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