The oxidation characters of a γ-TiAl based alloy: Ti-48Al-2Cr-2Nb in the simulated
combustion gas at(1()123 K) are investigated.The
total mass gain of the alloy after cyclic oxidation for(1()080) ks is measured.The phase composition and microstructure of the
oxide scale are analyzed and observed by XRD and SEM.The study indicates that Ti-48Al-2Cr-2Nb alloy shows strong anti-cyclic oxidation resistance at(1()123) K in the simulated
combustion gas,and the total mass gain is less than 1×10~(-2) kg·m~(-2) after exposure in above oxidation condition for 1()080 ks.The oxidation kinetics of the alloy nearly follows the parabolic oxidation law.Its oxide scale is compact and complete,and no spallation can be observed.The strong oxidation resistance of Ti-48Al-2Cr-2Nb in the simulated combustion gas at 1()123 K is attributable to the alloying addition of Cr and Nb together with the external oxidation conditions,which are beneficial to the preferential formation of a protective Al_(2)O_(3) layer in the oxide scale and the stabilization of oxygen influenced zone.