For near-α titanium alloys IMI 834 and TIMETAL 1100 oxidation behaviour was investigated as a function of microstructure. Isothermal thermogravimetry was performed at 750°C for 100 h in air. The morphologies and compositions of the scales produced were examined using scaninng and analytical electron microscopy and X-ray diffraction to establish the nature of the scales. The oxidation behaviour of IMI 834 depends less on microstructure than TIME TAL 1100, but both alloys were found to be most oxidation resistant with lamellar, and least with globular structure. The weight gain depends on scale adherence which is generally better on IMI 834. Scale adherence is markedly influenced by the formation of Ti3AlN during oxidation.
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