The effect of creep properties on the oxidation behaviour of FeAl intermetallics at high temperatures

Isothermal oxidation of doped and undoped FeAl specimens was performed at 1 000, 1100 and 1200 degreesC in ambient atmosphere for 50 hours. Slip deform ation occurred on the substrate of undoped FeAl at 1100 and 1200 degreesC. Pits on the specimen surface produced by etching were used to determine the orientation of the FeAl grains. The creep strain and stress of the FeAl su bstrate were evaluated based on creep kinetics. The sources of creep stress es during oxidation and the orientation of the plastically deformed grains were analysed. The relationship of slip system, creep stress and grain orie ntation of the undoped FeAl was established. The effects of reactive elemen ts on the properties of creep and scale spallation were also discussed.