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In this contribution, the microstructure of two intermetallic γ-TiAl-based alloys with different Al contents were examined after high-temperature deformation. To investigate the dynamic recrystallization of these alloys, isothermal compression tests were performed using a Gleeble ®  3500 simulator. For the experiments, a temperature range of 1 150 °C to 1 300 °C and strain rates of 0.005 s −1 , 0.05 s −1  and 0.5 s −1  were applied, up to a true strain of 0.9. The deformed microstructural states, particularly the multiphase alloys' dynamically recrystallized grain sizes were characterized via Scanning Electronic Microscopy (SEM) and Electron Back Scatter Diffraction (EBSD). The recrystallized grain sizes obtained from the experiments could be linked with the calculated Zener-Hollomon parameter through a power law.

practical metallography

Microstructure Characterization of Intermetallic γ-TiAl Based Alloys after High-Temperature Deformation: Presented at the Metallography Conference 2014 in Leoben, Austria