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Title: Hydrogenation-induced microstructure changes in titanium
Authors: Laptev, Roman Sergeevich
Lider, Andrey Markovich
Bordulev, Yuri Sergeevich
Kudiyarov, Victor Nikolaevich
Garanin, Georgy Viktorovich
Keywords: кластеры; позитроны; доплеровское уширение; водород; позитронная аннигиляция; hydrogen; defect complexes; clusters; positron annihilation; doppler broadening; positron lifetime
Issue Date: 2015
Publisher: Томский политехнический университет
Citation: Hydrogenation-induced microstructure changes in titanium / R. S. Laptev [et al.] // Journal of Alloys and Compounds. — 2015. — Vol. 645, suppl. iss. 1 : Proceedings from the 14th International Symposium on Metal-Hydrogen Systems: Fundamentals and Applications, 2014 (MH2014). — [P. S193–S195].
Abstract: Microstructure changes of commercially pure titanium in a wide range of hydrogen concentrations from 0.8 at.% to 32.0 at.% were studied by means of positron lifetime spectroscopy and Doppler broadening spectroscopy. We have obtained new experimental data on the evolution of positron annihilation parameters ?f, ?d and their corresponding intensities If, Id, as well as relative changes of parameters S/S0 and W/W0 depending on the hydrogen concentration in commercially pure titanium after gas-phase hydrogenation at 873 K. Results suggest that the hydrogenation of Ti samples up to concentrations of 1.31–2.27 at.% and subsequent cooling to a room temperature leads to the formation of vacancies and vacancy clusters. Further increase of the hydrogen concentration up to 32.0 at.% leads to the interaction of hydrogen with these defects and the formation of “cluster-hydrogen” and “vacancy-hydrogen” complexes.
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