The oxidation rate of a high temperature titanium alloy in air at 650℃ could be decreased significantly by means of ion implantation of 3×10 16 and 3×10 17 ions/cm 2 Nb. The microstructure and alloy elements distribution in the oxidation scale of unimplanted and Nb implanted titanium alloy were investigated by using SEM, XRD and AES. The addition of Nb could reduce the number of point defects and decrease the solubility of oxygen in the alloy substrate. Therefore, the oxidation resistance of the alloy in air at 650℃ is remarkably improved.
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