Abstract：The oxidation of Ti60 alloy (Ti-5.6A1-4.8Sn-2.OZr-1.OMo-0.85Nd-0.34Si) has been investigated. Thermodynamic and dynamic laws were studied by means of calculating the oxidation weight gain, oxidation rate constants and activities. The microstructure and morphology of oxidation scales on surface were examined with XRD and SEM. The element profile along oxidation layer was studied by AES to understand the diffusion behavior. The results indicate that Ti60 alloy exhibited the parabolic rule of oxidation rate at 650℃ and 700℃, but obeyed the parabolic-linear rule at 750℃, The oxidation scales are composed of TiO2 and A12O3. The morphology of oxidized surface possesses grill-like structure because α phase, β phase, and α/β interface are different in oxidation rate. Oxidation of rare earth phases is more serious than that of substrate.
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