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IssuesArchive of Issues2020-5pp.633-642

Archive of Issues

Total articles in the database: 4932
In Russian (. . ): 2364
In English (Mech. Solids): 2568

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I.V. Vlasov, V.Ye. Yegorushkin, V.Ye. Panin, A.V. Panin, and O.B. Perevalova, "Fractography, Fracture Toughness and Structural Turbulence Under Low-Temperature Shock Loading of a Nonequilibrium Titanium Alloy Ti-6Al-4V," Mech. Solids. 55 (5), 633-642 (2020)
Year 2020 Volume 55 Number 5 Pages 633-642
DOI 10.3103/S0025654420050155
Title Fractography, Fracture Toughness and Structural Turbulence Under Low-Temperature Shock Loading of a Nonequilibrium Titanium Alloy Ti-6Al-4V
Author(s) I.V. Vlasov (Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk, 634055 Russia)
V.Ye. Yegorushkin (Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk, 634055 Russia)
V.Ye. Panin (Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk, 634055 Russia; National Research Tomsk Polytechnic University, Tomsk, 634050 Russia; National Research Tomsk State University, Tomsk, 634050 Russia, viv@ispms.tsc.ru)
A.V. Panin (Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk, 634055 Russia; National Research Tomsk Polytechnic University, Tomsk, 634050 Russia)
O.B. Perevalova (Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk, 634055 Russia)
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 nonequilibrium 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 -70C, during deformation of 3D-printed samples, under conditions of shock separation of diffusion-sintered multilayer VT6 alloy packets.
Keywords Ti-6Al-4V alloy, nonequilibrium α and β phases, low-temperature impact toughness, fatigue life, structural turbulence
Received 20 February 2020Revised 27 March 2020Accepted 04 April 2020
Link to Fulltext https://link.springer.com/article/10.3103/S0025654420050155
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