Abstract
The oxidation behaviors of a newly-designed L12-strengthened multi-component Ni-Co-Fe-Cr-Al-Ti-Nb system were studied at 800 ℃, where the synergistic alloying effects of Ti, Nb, and Cr on the oxidation resistance were uncovered. The findings show that the doping of Ti facilitates the outward diffusion of metal cations and inward diffusion of oxygen ions through the Cr2O3 and Al2O3 scales, deteriorating the oxidation resistance. By substituting the Ti with Nb, a continuous and dense Al2O3 scale was potentially promoted benefiting from the “unlocked” Al atoms from the L12 particles. The increased additions of Cr and Nb contribute to the improved oxidation resistance.
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