Abstract
The structure of the titanium alloy Ti–6Al–4V manufactured by electron-beam melting is shown to be represented by initial β-phase grains more than 40 μm in size; the internal volume of the grains is filled with α-phase precipitates in the form of plates. The average size of the α plates is 1.6, 2, and 5 μm at beam currents of 2, 2.5, and 3 mA, respectively. In situ X-ray diffractometry using synchrotron radiation shows that the phase transitions in the titanium alloy are divided into three main stages during hydrogenation to a concentration of 0.6 wt % at a temperature of 650°C and a pressure of 1 atm. An increase in the beam current from 2 to 3 mA does not significantly affect the phase composition of the alloy. During hydrogenation, the growth rate of the volume concentration of the β phase is lower at a higher beam current. This indicates a decrease in the rate of hydrogen absorption with increasing beam current, which is associated with an increase in the size of α plates.
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ACKNOWLEDGMENTS
We are grateful to A.N. Shmakov and Z.S. Vinokurov, our colleagues at the Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, for assistance in conducting research at the “Precision Diffractometry II” station. This work was supported by the Russian Science Foundation, project no. 17-79-20 100, and within the framework of the program to improve the competitiveness of Tomsk Polytechnic University.
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Pushilina, N.S., Kudiiarov, V.N., Syrtanov, M.S. et al. Effect of the Beam Current during the Electron-Beam Melting of Titanium Alloy Ti–6Al–4V on the Structural Features and Phase Transitions in Gas-Phase Hydrogenation. J. Surf. Investig. 13, 429–433 (2019). https://doi.org/10.1134/S1027451019030170
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DOI: https://doi.org/10.1134/S1027451019030170