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Internal friction and evolution of ultrafine-grained structure during annealing of Grade-4 titanium subjected to severe plastic deformation

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Abstract

Electron microscopy, X-ray diffraction, tensile tests, and measurements of internal friction (IF) have been used to study the transformation of the structure and properties of commercial Grade-4 titanium subjected to deformation using equal-channel angular pressing combined with the Conform process (ECAP-Conform), drawing, and subsequent annealing. It has been found that the ECAP-CONFORM with drawing leads to a decrease in the grain size of titanium to about 150 nm. During annealing at 400°C for 1 h, the growth of separate grains was observed; with an increase in the annealing temperature to 450°C or higher, the growth of grains in the whole volume of a specimen occurred. It has been shown that titanium in the ultrafine-grained (UFG) state is characterized by an internal-friction peak at temperatures of 450–500°C (under the selected measurement conditions), which results from the processes of recovery and recrystallization. During repeated heating, no such effect was observed. At higher temperatures, a thermally activated relaxation internal-friction peak was found, which appears to be a grain-boundary internal-friction peak.

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Authors and Affiliations

  1. Institute of Physics of Molecules and Crystals, Ufa Scientific Center, Russian Academy of Sciences, pr. Oktyabrya 71, Ufa, 450054, Russia

    D. V. Gunderov & A. A. Churakova

  2. Ufa State Technical University of Aviation, ul. Karla Marksa 12, Ufa, 450000, Russia

    D. V. Gunderov, A. V. Polyakov, V. D. Sitdikov & A. A. Churakova

  3. National University of Science and Technology MISiS, Leninskii pr. 4, Moscow, 119049, Russia

    I. S. Golovin

Authors
  1. D. V. Gunderov
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  2. A. V. Polyakov
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  3. V. D. Sitdikov
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  4. A. A. Churakova
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  5. I. S. Golovin
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Correspondence to D. V. Gunderov.

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Original Russian Text © D.V. Gunderov, A.V. Polyakov, V.D. Sitdikov, A.A. Churakova, I.S. Golovin, 2013, published in Fizika Metallov i Metallovedenie, 2013, Vol. 114, No. 12, pp. 1136–1143.

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Gunderov, D.V., Polyakov, A.V., Sitdikov, V.D. et al. Internal friction and evolution of ultrafine-grained structure during annealing of Grade-4 titanium subjected to severe plastic deformation. Phys. Metals Metallogr. 114, 1078–1085 (2013). https://doi.org/10.1134/S0031918X13120041

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  • DOI: https://doi.org/10.1134/S0031918X13120041

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