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In the present study, two commercially available Ni-base superalloys, namely Rene 80 which contains Ti and IN 792 containing Ti and Ta, were investigated during isothermal oxidation at 1,050°C in Ar–20% O 2  gas up to 50 h. It was found that IN 792 showed a slightly lower oxidation rate as compared to Rene 80. Also differences in oxide scale microstructures and thicknesses were found. Both alloys formed qualitatively similar oxide scales consisting of outer TiO 2  on top of a Cr 2 O 3  scale and internally oxidized Al 2 O 3 . The IN 792 formed a thinner oxide scale in general as well as a thinner outer TiO 2  scale. Also the depth of the internally oxidized Al 2 O 3  precipitates is smaller in case of IN 792. These findings were correlated with the formation of TiTaO 4 , which in turn hampered outer Ti and inward oxygen flux.

Effect of Ti and Ta on Oxidation Kinetic of Chromia Forming Ni-Base Superalloys in Ar-O 2 -Based Atmosphere