Effect of different hydrogen Fugacities on the microstructure of additively manufactured Ti-6Al-4V

Polina Metalnikov, Ali Arslan Kaya, Guy Ben-Hamu, Dan Eliezer

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


In this study we compared the microstructural changes in the presence of hydrogen of Ti-6Al-4V alloy prepared by two different additive manufacturing (AM) methods: electron beam melting (EBM) and selective laser melting (SLM). Cathodic hydrogenation of AM Ti-6Al-4V resulted in significant expansion of β Ti phases due to the solute hydrogen, increasing of micro-strains, and α → titanium hydride/βH transformation. It was shown that SLM Ti-6Al-4V with acicular martensitic structure is more prone to hydrogen-induced phase transformation and hydrogen-assisted damage, compared to EBM. Moreover, it was revealed that different hydrogen charging environments cause different microstructural changes in EBM Ti-6Al-4V. Unlike cathodic hydrogen charging, gaseous hydrogen charging at elevated temperature reduced the process-induced micro-strains and promoted Al redistribution within the EBM Ti-6Al-4V. This resulted in massive precipitation of brittle α2-Ti3Al intermetallic compound, which act as a strong hydrogen trapping site aside from the Ti hydride phase.

Original languageEnglish
Article number113285
JournalMaterials Characterization
StatePublished - 1 Nov 2023


  • Additive manufacturing
  • Hydrogen
  • Microstructure
  • Ti-6Al-4V
  • X-ray diffraction

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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