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  In Situ Study of Gamma-TiAl Lamellae Formation in Supersaturated alpha(2)-Ti3Al Grains

Cha, L., Schmoelzer, T., Zhang, Z., Mayer, S., Clemens, H. J., Staron, P., et al. (2012). In Situ Study of Gamma-TiAl Lamellae Formation in Supersaturated alpha(2)-Ti3Al Grains. Advanced Engineering Materials, 14(5), 299-303.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0024-46C9-4 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0024-46E1-C
Genre: Journal Article

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 Creators:
Cha, Limei1, Author           
Schmoelzer, Thomas2, Author           
Zhang, Zaoli3, Author           
Mayer, Svea2, Author           
Clemens, Helmut J.2, Author           
Staron, Peter4, Author           
Dehm, Gerhard3, 5, Author           
Affiliations:
1Former Dept. Microstructure Interfaces, Max Planck Institute for Intelligent Systems, Max Planck Society, ou_1497657              
2Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Franz-Josef Strasse 18, 8700 Leoben, Austria, ou_persistent22              
3Erich Schmid Institute of Material Science, Austrian Academy of Sciences, Leoben, Austria, ou_persistent22              
4Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Roseggerstraße 12, A-8700 Leoben, Austria, ou_persistent22              
5Department Materialphysik, Montanuniversität Leoben, Austria, ou_persistent22              

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 Abstract: In situ heating transmission electron microscopy (TEM) was used to investigate the initial stage of g-TiAl lamellae formation in an intermetallic Ti–45Al–7.5Nb alloy (in at.%). The material was heat treated and quenched in a non-equilibrium state to consist mainly of supersaturated, ordered &alpha;2-Ti3Al grains. Subsequently, specimens were annealed inside a TEM up to 750 °C. The in situ TEM study revealed that ultra-fine &gamma;-TiAl laths precipitate in the &alpha;2-matrix at 730 °C which exhibit the classical Blackburn orientation relationship, i.e. (0001) &alpha;2//(111)g and [1120]a2//<110]g. The microstructural development observed in the in situ TEM experiment is compared to results from conventional ex situ TEM studies. In order to investigate the precipitation behavior of the &gamma;-phase with a complementary method, in situ high energy X-ray diffraction experiments were performed which confirmed the finding that &gamma;-laths start to precipitate at 730 °C from the supersaturated &alpha;2-matrix.

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Language(s): eng - English
 Dates: 2012
 Publication Status: Issued
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Title: Advanced Engineering Materials
  Abbreviation : Adv. Eng. Mater.
Source Genre: Journal
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Publ. Info: Weinheim : WILEY-VCH Verlag
Pages: - Volume / Issue: 14 (5) Sequence Number: - Start / End Page: 299 - 303 Identifier: ISSN: 1438-1656
CoNE: https://pure.mpg.de/cone/journals/resource/958634688014