Superplastic deformation behaviour and microstructure evolution of near-α Ti-Al-Mn alloy

A.V Mikhaylovskaya, A.O Mosleh, A.D Kotov, J.S. Kwame, T. Pourcelot, I.S Golovin, V.K Portnoy

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Abstract

Superplastic deformation behaviour of conventional sheets of a near-α titanium alloy (Ti-2.5Al-1.8Mn) was studied by a step-by-step decrease of the strain rate and constant strain rate tests in a temperature range of 790–915 °C. The research found that superplastic deformation is possible in a temperature range of 815–890 °С and a constant strain rate range of 2 × 10−4 to 1 × 10−3 s−1 with elongation above 300% and m-index above 0.4. Also, the research identified the optimum superplastic temperature range of 815–850 °C and constant strain rate of 4 × 10−4 s−1 which provide a maximum elongation of 600–650%. Strain hardening is accelerated by dynamic grain growth at high temperatures of 865 and 890 °С. High dislocation activity is observed at superplastic flow in α-phase. Constitutive modelling of superplastic deformation behaviour is performed, and possible deformation mechanisms are discussed. It is suggested that grain boundary sliding between the α-grains is accommodated by a dislocation slip/creep mechanism.
Original languageEnglish
Pages (from-to)469-477
Number of pages9
JournalMaterials Science and Engineering: A
Volume708
Early online date5 Oct 2017
DOIs
Publication statusPublished - 21 Dec 2017

Keywords

  • superplasticity
  • titanium alloys
  • micro size grain structure
  • dislocation structure

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    • 17 Citations
    • 3 Article
    • 1 Paper

    Examining failure behaviour of commercially pure titanium during tensile deformation and hole expansion test

    Kwame, J. S., Yakushina, E. & Blackwell, P., 15 May 2020, In : Journal of Materials and Applications. 9, 1, p. 32-37 6 p.

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  • Superplasticity of Ti-6Al-4V titanium alloy: microstructure evolution and constitutive modelling

    Mosleh, A. O., Mikhaylovskaya, A. V., Kotov, A. D., Kwame, J. S. & Aksenov, S. A., 30 May 2019, In : Materials. 12, 11, 20 p., 1756.

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    Cite this

    Mikhaylovskaya, A. V., Mosleh, A. O., Kotov, A. D., Kwame, J. S., Pourcelot, T., Golovin, I. S., & Portnoy, V. K. (2017). Superplastic deformation behaviour and microstructure evolution of near-α Ti-Al-Mn alloy. Materials Science and Engineering: A, 708, 469-477. https://doi.org/10.1016/j.msea.2017.10.017