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Title: Influence of beam current on microstructure of electron beam melted Ti-6Al-4V alloy
Authors: Laptev, Roman Sergeevich
Pushilina, Natalia Sergeevna
Kashkarov, Egor Borisovich
Syrtanov, Maksim Sergeevich
Stepanova, Ekaterina Nikolaevna
Koptyug, Andrey Valentinovich
Lider, Andrey Markovich
Keywords: titanium alloy; additive technology; electron beam melting; positron spectroscopy; defects; transmission electron microscopy; титановые сплавы; аддитивные технологии; позитронная спектроскопия; дефекты; электронная микроскопия
Issue Date: 2019
Publisher: Томский политехнический университет
Citation: Influence of beam current on microstructure of electron beam melted Ti-6Al-4V alloy / R. S. Laptev [et al.] // Progress in Natural Science: Materials International. — 2019. — Vol. 29, iss. 4. — [P. 440-446].
Abstract: The defect microstructure of the samples manufactured from Ti-6Al-4V powder was studied using electron beam melting (EBM) in the beam current range of 17 - 13 mA. The hybrid digital complex combined positron lifetime spectroscopy and coincidence Doppler broadening spectroscopy was used to characterize the defect structure of the materials. The microstructure and defects were also analyzed by transmission electron microscopy. It has been established that the main type of the defects in the EBM manufactured samples is dislocations. According to the conducted measurements and calculations, the dislocation density in the EBM manufactured samples exceeds by two orders the similar value for the cast Ti-6Al-4Valloy. Formation of Ti-Ti-Al nanoscale clusters has been found in the EBM manufactured samples.
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