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

Cha, Limei; Schmoelzer, Thomas; Zhang, Zaoli; Mayer, Svea; Clemens, Helmut J.; Staron, Peter; Dehm, Gerhard

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

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Cha, Limei
Former Dept. Microstructure Interfaces, Max Planck Institute for Intelligent Systems, Max Planck Society;

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Citation

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.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-46C9-4

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 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)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 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.