The oxidation behavior of oxide-dispersed β-NiAl: I. Short-term performance at 1200°C

Oxide dispersions were added to β-NiAl alloys using a powder-metallurgy technique. During 20, 2-hr cycles at 1200°C, scale adhesion of the external α-Al₂O₃ was improved by the addition of Y₂O₃ and ZrO₂. Relative to an undoped, cast NiAl alloy, no improvement was observed for TiO₂ and HfO₂ additions and negative effects were observed for Al₂O₃ and La²O₃ additions. The various cation additions also had differing effects on the scale morphology and isothermal growth rates at 1200°C. The effect of the dopants added as oxide dispersions was compared to similar alloy additions of the dopants to β-NiAl.