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High-Strength State and Strengthening Mechanisms of Ultrafine-Grained Titanium

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Abstract

This paper discusses the formation of ultrafine-grained (UFG) structure and nanosized second-phase precipitates in commercially pure Grade 4 titanium subjected to severe plastic deformation by high pressure torsion at room temperature with subsequent heat treatment. It was found that the combined processing of Grade 4 titanium provides very high tensile strength (σB ≈ 1500 MPa), which significantly exceeds the previous results for this material. Analysis of the strengthening mechanisms showed that the superstrength of commercially pure titanium is due to several factors: UFG structure formation, dispersion strengthening from second-phase nanoparticles, high dislocation density, and grain boundary segregation. The contribution of these strengthening mechanisms is evaluated and compared with experimental data.

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Notes

  1. Additional study of the grain boundary strengthening of UFG titanium will be performed taking into account similar works.

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Funding

The work was carried out with financial support from the Russian Foundation for Basic Research (Grant No. 20-03-00614A) and under the government statement of work for laboratories (Order MN-8/1356 of 20.09.2021).

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  1. Ufa University of Science and Technology, 450076, Ufa, Russia

    E. I. Usmanov, L. R. Rezyapova & R. Z. Valiev

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Correspondence to L. R. Rezyapova.

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Usmanov, E.I., Rezyapova, L.R. & Valiev, R.Z. High-Strength State and Strengthening Mechanisms of Ultrafine-Grained Titanium. Phys Mesomech 26, 483–494 (2023). https://doi.org/10.1134/S1029959923050016

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