A Y 2 0 3 -stabilized Zr0 2 coating on three different oxide-dispersed (Y 2 0 3 , Zr0 2 and Al 2 0 3 ) 13-NiAl substrates was studied to evaluate the spallation behaviour of the coating and its effect on the oxidation behavior of these alloy substrates. Spallation of the coating during cyclic testing at 1200°C primarily occurred at the Al 2 0 3 scale-substrate interface and was dependent on the adhesion of the scale to the substrate. Uncoated, Y 2 0rdispersed 13-NiAI had the best AI 2 0 3 scale adhesion and the coated 13-NiAI substrate had the longest coating lifetime. Al 2 0 3 -dispersed 13-NiAI exhibited the poorest scale adhesion and the coating completely spalled after two 2-hour cycles. For this model-type system, the growth of voids at the metal-scale interface appears to be critical in determining scale adhesion and thus coating lifetime.