Abstract
The oxidation kinetics of TiAl intermetallic at 500–900 °C in air is studied using a gravimetric method, and the phase composition of the scale is studied using an x-ray phase analysis. At t > 600 °C, the kinetics of oxidation is described by a parabolic equation. The oxides TiO2 (rutile), γ-Al2O3, α-Al2O3, Ti2O3 are found in the scale. It is shown that at the first stage the γ-Al2O3 and low-titanium oxides form on the sample surface at t 800 °C, the oxidation mechanism changes: counterdiffusion of titanium ions through interstitial sites in TiO2 lattice occurs.
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