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The thermal stability of omega phase in TiAl alloys has been investigated using scanning and transmission electron microscopy and it has been found that Zr has a strong effect in stabilising the omega phase. In Ti–44Al–4Nb–4Zr–0.2Si–1B the omega solvus was determined as just over 900°C. Increasing additions of Zr to Ti–44Al–4Nb–2Mo resulted in an increase in the volume fraction of omega phase at 700°C...
Three different characteristic microstructures of Ti–44Al–8Nb–1B (at.%) have been studied by in situ loading, with acoustic emission and image correlation and ex situ by electron backscatter diffraction and transmission electron microscopy. Microyielding and pre-yield cracking occur at different applied stress levels; nearly fully lamellar material yielding at the lowest and duplex material at the...
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