Abstract
Microstructure and room temperature mechanical properties of α-titanium alloy Ti-5Al-0.5 V subjected to equal channel angular pressing (ECAP) and subsequent ultrasonic treatment (UST) have been studied. The ECAP was carried out at 600 °C by route Bc and the UST at the frequency of 20 kHz and amplitude of compression-tension stresses of 100 MPa for processing time of 60 s. The dislocation densities after ECAP and subsequent UST were estimated by x-ray diffraction and positron lifetime spectroscopy. By the latter, vacancy concentration also was determined. It has been shown that UST results in a very little increase in the dislocation density and vacancy concentration and has no considerable effect on the mechanical properties of the ECAP-ed titanium alloys. Basing on the data obtained and earlier published results of computer simulations of the behavior of nonequilibrium grain boundaries in Ni and Ti under the action of ultrasound it is concluded that the structural transformations in Ti under UST occur at much higher stresses than in Ni, in which UST results in significant modifications of the structure and properties.
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Acknowledgements
The present work was accomplished according to the state assignment of the Institute for Metals Superplasticity Problems of the Russian Academy of Sciences financed by the Ministry of Science and Higher Education of Russia. Partial financial support by ERDF under the project No. CZ.02.1.01/0.0/0.0/15 003/0000485 is also gratefully acknowledged. Electron microscopic and x-ray diffraction studies were carried out on the facilities of shared services center of IMSP RAS ”Structural and Physical-Mechanical Studies of Materials”.
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Mukhametgalina, A.A., Murzinova, M.A., Nazarov, A.A. et al. Ultrasonic Treatment of Ti-5Al-0.5 V Alloy Subjected to Equal-Channel Angular Pressing. Met. Mater. Int. 28, 1257–1263 (2022). https://doi.org/10.1007/s12540-021-01018-2
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DOI: https://doi.org/10.1007/s12540-021-01018-2