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Characterization of titanium aluminide alloy components fabricated by additive manufacturing using electron beam melting / L.E. Murr in Acta materialia, Vol. 58 N° 5 (Mars 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 5 (Mars 2010) . - pp. 1887–1894 Titre : Characterization of titanium aluminide alloy components fabricated by additive manufacturing using electron beam melting Type de document : texte imprimé Auteurs : L.E. Murr, Auteur ; S.M. Gaytan, Auteur ; A. Ceylan, Auteur Année de publication : 2011 Article en page(s) : pp. 1887–1894 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Electron  beam  methods  Titanium  aluminides  SEM  TEM  XRD Résumé : Intermetallic, γ-TiAl, equiaxed, small-grain (∼2 μm) structures with lamellar γ/α2-Ti3Al 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 cm3 g−1 (for a density of 3.76 g cm−3), in contrast to 0.27 GPa cm3 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. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008118 [article] Characterization of titanium aluminide alloy components fabricated by additive manufacturing using electron beam melting [texte imprimé] / L.E. Murr, Auteur ; S.M. Gaytan, Auteur ; A. Ceylan, Auteur . - 2011 . - pp. 1887–1894. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 5 (Mars 2010) . - pp. 1887–1894 Mots-clés : Electron  beam  methods  Titanium  aluminides  SEM  TEM  XRD Résumé : Intermetallic, γ-TiAl, equiaxed, small-grain (∼2 μm) structures with lamellar γ/α2-Ti3Al 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 cm3 g−1 (for a density of 3.76 g cm−3), in contrast to 0.27 GPa cm3 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. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008118