In Situ Study of γ-TiAl Lamellae Formation in Supersaturated α2-Ti3Al Grains

In Situ Study of γ-TiAl Lamellae Formation in Supersaturated α2-Ti3Al Grains

In situ heating transmission electron microscopy (TEM) was used to investigate the initial stage of γ‐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 α2‐Ti3Al...

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Veröffentlicht in:Advanced engineering materials 2012-05, Vol.14 (5), p.299-303
Hauptverfasser: Cha, Limei, Schmoelzer, Thomas, Zhang, Zaoli, Mayer, Svea, Clemens, Helmut, Staron, Peter, Dehm, Gerhard
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container_end_page 303
container_issue 5
container_start_page 299
container_title Advanced engineering materials
container_volume 14
creator Cha, Limei
Schmoelzer, Thomas
Zhang, Zaoli
Mayer, Svea
Clemens, Helmut
Staron, Peter
Dehm, Gerhard
description In situ heating transmission electron microscopy (TEM) was used to investigate the initial stage of γ‐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 α2‐Ti3Al grains. Subsequently, specimens were annealed inside a TEM up to 750 °C. The in situ TEM study revealed that ultra‐fine γ‐TiAl laths precipitate in the α2‐matrix at ≈730 °C which exhibit the classical Blackburn orientation relationship, i.e. (0001)α2//(111)γ and [$11{\bar {2}}0$]α2//
doi_str_mv 10.1002/adem.201100272
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The material was heat treated and quenched in a non‐equilibrium state to consist mainly of supersaturated, ordered α2‐Ti3Al grains. Subsequently, specimens were annealed inside a TEM up to 750 °C. The in situ TEM study revealed that ultra‐fine γ‐TiAl laths precipitate in the α2‐matrix at ≈730 °C which exhibit the classical Blackburn orientation relationship, i.e. (0001)α2//(111)γ and [$11{\bar {2}}0$]α2//&lt;110]γ. 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 γ‐phase with a complementary method, in situ high energy X‐ray diffraction experiments were performed which confirmed the finding that γ‐laths start to precipitate at ≈730 °C from the supersaturated α2‐matrix. Intermetallic TiAl alloys are promising high temperature materials with low densities and high strengths. The formation of γ‐lamellae from a supersaturated α2 matrix determines their mechanical properties. This paper reports on in situ studies regarding the precipitation of γ‐lamellae using transmission electron microscopy and high energy X‐ray diffraction. By combining both techniques, the temperature at which lamellae start to form was determined.</description><identifier>ISSN: 1438-1656</identifier><identifier>EISSN: 1527-2648</identifier><identifier>DOI: 10.1002/adem.201100272</identifier><language>eng</language><publisher>Weinheim: WILEY-VCH Verlag</publisher><ispartof>Advanced engineering materials, 2012-05, Vol.14 (5), p.299-303</ispartof><rights>Copyright © 2012 WILEY‐VCH Verlag GmbH &amp; Co. 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