<p>The effect of varying Ce concentration (1.0 at.% &amp; 0.1 at.%) on oxidation behavior of β-NiAl alloy is investigated at 1100&#xa0;°C using x-ray diffraction, scanning electron microscopy and x-ray spectroscopy techniques. Oxidation experiments are conducted in two stages: (1) A series of ex situ transient-oxidation experiments are performed to observe the dynamic changes during initial 10 hours of oxidation, (2) long-term oxidation experiments (100 hours) are performed to reveal the oxide surface and cross section morphology. Further, the dynamic effects are then compared to explain oxide growth kinetics, which invariably change the scale thickness and the oxidation behavior. We observed that the reduction in Ce concentration from 1.0 at.% to 0.1 at.% results in a significant reduction in oxide growth rate. After 100 hours of oxidation, a needle shaped Al₂O₃ morphology is observed at the surface. Oxide cross section micrographs reveal that the phenomenon of internal oxidation occurs simultaneously along with external oxidation. However, the propagation of the internal oxidation front is slower at low Ce concentration, resulting in slower oxide growth and a relatively planar scale. Our work explains the efficacy of low Ce concentration on the quantitative improvement in oxide growth kinetics, offering alloy design principles for RE-doped β-NiAl-based oxidation-resistant alloys.</p>