Characterization of titanium aluminide alloy components fabricated by additive manufacturing using electron beam melting

Intermetallic, γ-TiAl, equiaxed, small-grain (∼2 μm) structures with lamellar γ/ α 2-Ti 3Al colonies with average spacing of 0.6 μm have been fabricated by additive manufacturing using electron beam melting (EBM) of precursor, atomized powder. The residual microindentation (Vickers) hardness (HV) av...

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Bibliographic Details
Published in:Acta materialia 2010-03, Vol.58 (5), p.1887-1894
Main Authors: Murr, L.E., Gaytan, S.M., Ceylan, A., Martinez, E., Martinez, J.L., Hernandez, D.H., Machado, B.I., Ramirez, D.A., Medina, F., Collins, S., Wicker, R.B.
Format: Article
Language:English
Subjects:
Applied sciences
Electron beam methods
Exact sciences and technology
Metals. Metallurgy
SEM
TEM
Titanium aluminides
XRD
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Summary:Intermetallic, γ-TiAl, equiaxed, small-grain (∼2 μm) structures with lamellar γ/ α 2-Ti 3Al colonies with average spacing of 0.6 μm have been fabricated by additive manufacturing using electron beam melting (EBM) of precursor, atomized powder. The residual microindentation (Vickers) hardness (HV) averaged 4.1 GPa, corresponding to a nominal yield strength of ∼1.4 GPa (∼HV/3), and a specific yield strength of 0.37 GPa cm 3 g −1 (for a density of 3.76 g cm −3), in contrast to 0.27 GPa cm 3 g −1 for EBM-fabricated Ti–6Al–4V components. These results demonstrate the potential to fabricate near net shape and complex titanium aluminide products directly using EBM technology in important aerospace and automotive applications.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2009.11.032