Influence of beam current on microstructure of electron beam melted Ti-6Al-4V alloy

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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.

Original languageEnglish
JournalProgress in Natural Science: Materials International
DOIs
Publication statusAccepted/In press - 1 Jan 2019

Keywords

  • Additive technology
  • Defects
  • Electron beam melting
  • Positron spectroscopy
  • Titanium alloy
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Materials Science(all)

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