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The oxidation properties of the 5th generation Ni-base Superalloys, TMS-173 and TMS-196 were investigated comparing with 2nd generation superalloy, PWA-1484. Isothermal oxidation examination was performed at the temperatures from 1023 K to 1373 K in air for up to 3.6×106 s, and the oxides formed on the specimen surface during oxidation tests were identified by using XRD analysis and SEM cross section observation.   TMS-173 formed thick NiO layer on the surface caused by the outward diffusion of Ni at 1023 K and showed poor oxidation resistance at 1173 K and 1373 K due to the spinel formation. TMS-196 and the 2nd generation superalloy PWA-1484 show protective Al2O3 layer formation and excellent oxidation resistance at all temperatures examined in this study. This favorable result was caused by their high Cr content.

Temperature Dependence of Oxidation Properties for 5th Generation Ni-Base Single-Crystal Superalloys