User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse




Journal Article

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


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

External Ressource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available

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