Abstract
Interstitial elements (O, C, N) seem to have a key role with respect to mechanical properties of TiAl-based alloys. This paper presents an atom-probe study of the distribution of interstitial elements in the α 2 and γ phases of two-phase TiAl alloys. These elements are found to preferentially segregate in the α 2 phase. This effect is particularly important for oxygen. Measurements of oxygen concentration in the γ phase of two-phase and of single-phase alloys were performed. This allows the maximum solubility of oxygen in the γ phase to be determined. The result shows that the poor low-temperature ductility of single-phase TiAl alloys cannot be simply due to the presence of oxygen in the γ phase.
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