The effects of Ti on the high temperature oxidation of Ni-based superalloys were investigated by cyclic oxidation at 850∘C and 1000∘C . The oxide scale formed at 850∘C consists of Cr₂O₃ , Al₂O₃ , and NiCr₂O₄ layers, while a continuous Al₂O₃ layer was formed at 1000∘C . The oxidation rate of the alloy with higher Ti content was higher than the alloy with less Ti content at 850∘C , possibly due to the increase in the metal vacancy concentration in the Cr₂O₃ layer involved by incorporation of Ti⁴⁺ . However, Ti improved the oxidation resistance of the superalloy at 1000∘C by reducing oxygen vacancy concentration in Al₂O₃ layer.
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Park et al. (2016) studied this question.
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