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In situ observations of solidification processes in γ-TiAl alloys by synchrotron radiation

Shuleshova, O. and Holland-Moritz, Dirk and Löser, W. and Voss, A. and Hartmann, H. and Hecht, U. and Witusiewicz, V.T. and Herlach, D.M. and Büchner, B. (2010) In situ observations of solidification processes in γ-TiAl alloys by synchrotron radiation. Acta Materialia, 58 (7), pp. 2408-2418. Elsevier. DOI: 10.1016/j.actamat.2009.12.027.

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Abstract

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.

Document Type:Article
Title:In situ observations of solidification processes in γ-TiAl alloys by synchrotron radiation
Authors:
AuthorsInstitution or Email of Authors
Shuleshova, O.IFW Dresden
Holland-Moritz, Dirkdirk.holland-moritz@dlr.de
Löser, W.IFW Dresden
Voss, A.IFW Dresden
Hartmann, H.DLR
Hecht, U.ACCESS
Witusiewicz, V.T.ACCESS
Herlach, D.M.dieter.herlach@dlr.de
Büchner, B.IFW Dresden
Date:April 2010
Journal or Publication Title:Acta Materialia
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:58
DOI:10.1016/j.actamat.2009.12.027
Page Range:pp. 2408-2418
Publisher:Elsevier
Status:Published
Keywords:Ti-Al-Nb,solidification
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Dr.rer.nat. Dirk Holland-Moritz
Deposited On:07 Apr 2010 10:49
Last Modified:20 Mar 2013 19:42

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