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

Research output: Contribution to journalArticle

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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.
LanguageEnglish
Pages469-477
Number of pages9
JournalMaterials Science and Engineering: A
Volume708
Early online date5 Oct 2017
DOIs
Publication statusPublished - 21 Dec 2017

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Superplastic deformation
strain rate
Strain rate
microstructure
Microstructure
elongation
Elongation
Temperature
Grain boundary sliding
strain hardening
titanium alloys
Grain growth
Titanium alloys
Strain hardening
temperature
sliding
Creep
slip
grain boundaries

Keywords

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

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
Mikhaylovskaya, A.V ; Mosleh, A.O ; Kotov, A.D ; Kwame, J.S. ; Pourcelot, T. ; Golovin, I.S ; Portnoy, V.K. / Superplastic deformation behaviour and microstructure evolution of near-α Ti-Al-Mn alloy. In: Materials Science and Engineering: A. 2017 ; Vol. 708. pp. 469-477.
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Superplastic deformation behaviour and microstructure evolution of near-α Ti-Al-Mn alloy. / Mikhaylovskaya, A.V; Mosleh, A.O; Kotov, A.D; Kwame, J.S.; Pourcelot, T.; Golovin, I.S; Portnoy, V.K.

In: Materials Science and Engineering: A, Vol. 708, 21.12.2017, p. 469-477.

Research output: Contribution to journalArticle

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AU - Mikhaylovskaya, A.V

AU - Mosleh, A.O

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