Microstructure Evolution of Niobium Rich Advanced Titanium Aluminide Alloy During Hot CompressionWednesday (26.09.2018) 17:15 - 17:30 S1/01 - A02 Part of:
The gamma titanium aluminide (γ-TiAl) based alloys are intriguing researchers because of their potential for replacing Ni-base superalloys in the aerospace industry, owing to their higher specific strength. However processing TiAl alloys have been a known challenge because of complex microstructure with multiple phases. The purpose of this study is to understand the evolution of microstructure during the hot isothermal compression tests. Cylindrical samples were compressed to varying strain levels upto 60% using Gleeble 3800TM physical simulator. Deformed samples were then characterised using scanning electron microscopy (SEM/EBSD) and transmission electron microscopy (TEM) to understand the various phases present. A significant increase of volume fraction of α2 and γ phases at the cost of βₒ phase with increasing strain was observed. Preliminary analysis from TEM indicate twinning and stacking faults. Also prominently visible are the kinking and bending. The critical strains for dynamic recovery (DRV) and dynamic recrystallization (DRX) were calculated.
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