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Phase Transformations and Mechanical Properties of Two-Component Titanium Alloys after Heat Treatment in the Two-Phase Region (α + Intermetallic Compound) and High-Pressure Torsion

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Abstract

In this paper, we measure the nanohardness (H) and Young’s modulus (E) of three alloys: Ti–2.5 wt % Ni, Ti–2 wt % Cr, and Ti–2.2 wt % Fe preliminarily annealed in the two-phase region of the phase diagram (αTi + intermetallic compound) and then subjected to high-pressure torsion. The titanium alloy with the nickel addition showed the highest H and E values, they vary uniformly from the center to the edge of the sample, and the alloy after high-pressure torsion contains two phases: α and ω. The nanohardness of the alloy Ti–2.5 wt % Ni along the sample radius over the surface changes insignificantly: from minimal 4.8 to maximal 5.2 GPa, as does Young’s modulus (from 121 to 155 GPa). The maxima of the H and E values fall in the middle of the sample radius. The alloy Ti–2.2 wt % Fe behaves differently: the presence of four phases α, β, ω, and TiFe leads to a strong scatter in the measured H and E values: from 4.4 to 2.0 GPa and from 131 to 12 GPa, respectively. Processing the P–h diagrams allows the nanohardness of the material to be related to its creep behaviour.

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ACKNOWLEDGMENTS

We are deeply grateful to M. I. Egorkin (LPCBC at the ISSP, RAS) for the manufacture of titanium alloys and A. R. Kilmametov (Institute of Nanotechnology at the KIT, Karlsruhe, Germany) for processing samples under high-pressure torsion.

Funding

This work was partially carried out within the framework of the state assignment of the Osipyan Institute of Solid State Physics, Russian Academy of Sciences and was supported by the Russian Foundation for Basic Research, projects no. 18-29-17047 and no. 19-58-06002, as well as by Derzhavin Tambov State University, grant no. 591-3, February 25, 2020.

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Authors and Affiliations

  1. Osipyan Institute of Solid State Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    A. S. Gornakova, B. B. Straumal & N. S. Afonikova

  2. Chernogolovka Scientific Center, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    B. B. Straumal

  3. Research Institute “Nanotechnology and Nanomaterials”, Derzhavin Tambov State University, 392000, Tambov, Russia

    Yu. I. Golovin, T. S. Pirozhkova & A. I. Tyurin

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  1. A. S. Gornakova
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  2. B. B. Straumal
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  3. Yu. I. Golovin
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  4. N. S. Afonikova
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  5. T. S. Pirozhkova
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  6. A. I. Tyurin
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Correspondence to A. S. Gornakova or B. B. Straumal.

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Translated by A. Ivanov

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Gornakova, A.S., Straumal, B.B., Golovin, Y.I. et al. Phase Transformations and Mechanical Properties of Two-Component Titanium Alloys after Heat Treatment in the Two-Phase Region (α + Intermetallic Compound) and High-Pressure Torsion. J. Surf. Investig. 15, 1154–1158 (2021). https://doi.org/10.1134/S1027451021060082

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