naa a22 4500 510814913 CHVBK 20180411083502.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1134/S0031918X13120041 doi (NATIONALLICENCE)springer-10.1134/S0031918X13120041 Internal friction and evolution of ultrafine-grained structure during annealing of Grade-4 titanium subjected to severe plastic deformation [Elektronische Daten] [D. Gunderov, A. Polyakov, V. Sitdikov, A. Churakova, I. Golovin] 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. Pleiades Publishing, Ltd., 2013 severe plastic deformation nationallicence ultrafine-grained structure nationallicence equal-channel angular pressing nationallicence Conform process nationallicence internal friction nationallicence transmission electron microscopy nationallicence X-ray diffraction analysis nationallicence mechanical properties nationallicence Gunderov D. Institute of Physics of Molecules and Crystals, Ufa Scientific Center, Russian Academy of Sciences, pr. Oktyabrya 71, 450054, Ufa, Russia aut Polyakov A. Ufa State Technical University of Aviation, ul. Karla Marksa 12, 450000, Ufa, Russia aut Sitdikov V. Ufa State Technical University of Aviation, ul. Karla Marksa 12, 450000, Ufa, Russia aut Churakova A. Institute of Physics of Molecules and Crystals, Ufa Scientific Center, Russian Academy of Sciences, pr. Oktyabrya 71, 450054, Ufa, Russia aut Golovin I. National University of Science and Technology MISiS, Leninskii pr. 4, 119049, Moscow, Russia aut The Physics of Metals and Metallography Springer US; http://www.springer-ny.com 114/12(2013-12-01), 1078-1085 0031-918X 114:12<1078 2013 114 11508 https://doi.org/10.1134/S0031918X13120041 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0031918X13120041 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gunderov D. Institute of Physics of Molecules and Crystals, Ufa Scientific Center, Russian Academy of Sciences, pr. Oktyabrya 71, 450054, Ufa, Russia aut NATIONALLICENCE 700 1- Polyakov A. Ufa State Technical University of Aviation, ul. Karla Marksa 12, 450000, Ufa, Russia aut NATIONALLICENCE 700 1- Sitdikov V. Ufa State Technical University of Aviation, ul. Karla Marksa 12, 450000, Ufa, Russia aut NATIONALLICENCE 700 1- Churakova A. Institute of Physics of Molecules and Crystals, Ufa Scientific Center, Russian Academy of Sciences, pr. Oktyabrya 71, 450054, Ufa, Russia aut NATIONALLICENCE 700 1- Golovin I. National University of Science and Technology MISiS, Leninskii pr. 4, 119049, Moscow, Russia aut NATIONALLICENCE 773 0- The Physics of Metals and Metallography Springer US; http://www.springer-ny.com 114/12(2013-12-01), 1078-1085 0031-918X 114:12<1078 2013 114 11508 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer