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In situ observations of solidification processes in γ-TiAl alloys by synchrotron radiation / Olga Shuleshova in Acta materialia, Vol. 58 N° 7 (Avril 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2408–2418 Titre : In situ observations of solidification processes in γ-TiAl alloys by synchrotron radiation Type de document : texte imprimé Auteurs : Olga Shuleshova, Auteur ; Dirk Holland-Moritz, Auteur ; Wolfgang Löser, Auteur Année de publication : 2011 Article en page(s) : pp. 2408–2418 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Titanium  aluminides  Phase  transformations  Synchrotron  radiation  Thermodynamics Résumé : In situ observations of phase transformations involving melts are performed using energy-dispersive diffraction of synchrotron X-rays on electromagnetically levitated γ-TiAl alloys containing Nb. The determined primary solidification modes, confirmed by microstructure analysis, delivered new reliable data about the boundary of the α(Ti) solidification domain, which differs in the various Ti–Al–Nb phase diagram descriptions. These data have been used for a reassessment of the thermodynamic database of the ternary Ti–Al–Nb system. The new description realistically reflects the experimental findings. Liquidus and solidus temperatures determined by the pyrometric method agree fairly well with the calculated values. Direct experimental information on the nature of the reactions along the univariant lines is provided. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008738 [article] In situ observations of solidification processes in γ-TiAl alloys by synchrotron radiation [texte imprimé] / Olga Shuleshova, Auteur ; Dirk Holland-Moritz, Auteur ; Wolfgang Löser, Auteur . - 2011 . - pp. 2408–2418. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2408–2418 Mots-clés : Titanium  aluminides  Phase  transformations  Synchrotron  radiation  Thermodynamics Résumé : In situ observations of phase transformations involving melts are performed using energy-dispersive diffraction of synchrotron X-rays on electromagnetically levitated γ-TiAl alloys containing Nb. The determined primary solidification modes, confirmed by microstructure analysis, delivered new reliable data about the boundary of the α(Ti) solidification domain, which differs in the various Ti–Al–Nb phase diagram descriptions. These data have been used for a reassessment of the thermodynamic database of the ternary Ti–Al–Nb system. The new description realistically reflects the experimental findings. Liquidus and solidus temperatures determined by the pyrometric method agree fairly well with the calculated values. Direct experimental information on the nature of the reactions along the univariant lines is provided. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008738