Formation of Al–Al2O3 core–shell nanosphere chains during electron beam melting of γ-TiAl

Several core–shell nanosphere chains were observed in the electron beam melted Ti–48Al–2Cr–2Nb samples. The formation mechanism of such core–shell nanospheres, induced by Al vaporization, during the electron beam melting of γ-TiAl was investigated using the HRTEM, FESEM, STEM, and XRD analyses. The...

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Bibliographic Details
Published in:Intermetallics 2021-09, Vol.136, p.107261, Article 107261
Main Authors: Shahedi Asl, Mehdi, Nayebi, Behzad, Farvizi, Mohammad, Alaghmandfard, Reza, Shokouhimehr, Mohammadreza, Janaki Ram, G.D., Mohammadi, Mohsen
Format: Article
Language:English
Subjects:
Additive manufacturing
Aluminum oxide
Chains
Core–shell nanosphere
Electron beam melting
Electrons
Intermetallic compounds
Intermetallics
Nanospheres
Solidification
Titanium aluminide
Titanium aluminides
Vaporization
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Summary:Several core–shell nanosphere chains were observed in the electron beam melted Ti–48Al–2Cr–2Nb samples. The formation mechanism of such core–shell nanospheres, induced by Al vaporization, during the electron beam melting of γ-TiAl was investigated using the HRTEM, FESEM, STEM, and XRD analyses. The solidification of TiAl/Ti3Al lamellae, in the vicinity of the Al-diminished zones, was disclosed by microstructural studies. The core and shell of the nanospheres were characterized as porous Al and α-Al2O3, respectively. Finally, the formation of core–shell nanosphere chains in the additive manufactured γ-TiAl was schematically illustrated. [Display omitted] •γ-TiAl intermetallic samples were fabricated by electron beam melting (EBM) process.•Formation mechanism of core–shell nanosphere chains during EBM was investigated.•Core and shell of the nanospheres were characterized as Al and Al2O3, respectively.•Microstructural alteration during the EBM of γ-TiAl was schematically illustrated.
ISSN:0966-9795
1879-0216
DOI:10.1016/j.intermet.2021.107261