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Influence of beam current on microstructure of electron beam melted Ti-6Al-4V alloy |
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| Authors: | Roman Laptev Natalia Pushilina Egor Kashkarov Maxim Syrtanov Ekaterina Stepanova Andrey Koptyug Andrey Lider |
| Affiliation: | 1. National Research Tomsk Polytechnic University, Tomsk, 634050, Russia;2. Mid Sweden University, Östersund, SE-831 25, Sweden |
| 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. |
| Keywords: | Corresponding author Titanium alloy Additive technology Electron beam melting Positron spectroscopy Defects Transmission electron microscopy |
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