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Fractography, Fracture Toughness and Structural Turbulence Under Low-Temperature Shock Loading of a Nonequilibrium Titanium Alloy Ti–6Al–4V

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Abstract—

The titanium alloy Ti–6Al–4V with strongly nonequilibrium α- and β-phases has been studied for the first time. For this, it was subjected to cross-helical rolling (CHR) at T = 1000°C (above the polymorphic transformation temperature), and then quenched in water in order to partially preserve vanadium in the α-phase, and aluminum in the β-phase. Under active uniaxial tension, the non-equilibrium VT6 alloy was deformed in the absence of strain hardening at room temperature. Alloys treated with CHR below the polymorphic transformation temperature showed traditional parabolic hardening. The non-equilibrium of the VT6 alloy caused a strong increase in its impact toughness at low temperatures down to T = –70°C. The fatigue life of a nonequilibrium alloy has doubled. If the initial alloy has ductile-brittle fracture at low negative temperatures, then the nonequilibrium alloy deforms viscously with all signs of structural turbulence. Structural turbulence in a nonequilibrium alloy manifests itself in the temperature range from 20 to –70°C, during deformation of 3D-printed samples, under conditions of shock separation of diffusion-sintered multilayer VT6 alloy packets.

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Funding

The work was carried out within the framework of the Program of Fundamental Scientific Research of the State Academies of Sciences for 2013–2020 (project no. III.23.1.1).

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Authors and Affiliations

  1. Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, 634055, Tomsk, Russia

    I. V. Vlasov, V. Ye. Yegorushkin, V. Ye. Panin, A. V. Panin & O. B. Perevalova

  2. National Research Tomsk Polytechnic University, 634050, Tomsk, Russia

    V. Ye. Panin & A. V. Panin

  3. National Research Tomsk State University, 634050, Tomsk, Russia

    V. Ye. Panin

Authors
  1. I. V. Vlasov
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  2. V. Ye. Yegorushkin
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  3. V. Ye. Panin
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  4. A. V. Panin
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  5. O. B. Perevalova
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Correspondence to V. Ye. Panin.

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Translated by M. Katuev

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Vlasov, I.V., Yegorushkin, V.Y., Panin, V.Y. et al. Fractography, Fracture Toughness and Structural Turbulence Under Low-Temperature Shock Loading of a Nonequilibrium Titanium Alloy Ti–6Al–4V. Mech. Solids 55, 633–642 (2020). https://doi.org/10.3103/S0025654420050155

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