title: TEM and SNMS studies of protective alumina scales on NiCrAlY-alloys.
abstract: The effect of Si addition on the oxidation behaviour of NiCrAlY alloys in the temperature range 950 bis 1100 degrees C has been investigated. During isothermal oxidation oxide growth rates were practically independent of the Si-content. However during cyclic oxidation Si additions were beneficial. Si additions of 1-2(m)/(0) appeared to shift the onset for spallation to longer times. It was found that Si stabilizes the beta-phase and probably it suppresses the formation of metastable Al(2)O(3) modifications.
authors.affiliation: Institute for Materials in Energy Systems, IWE I: Microstructure and Properties of Materials, Forschungszentrum Jülich GmbH, (KFA), D-52425, Jülich, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Clemens
authors.forename: V
authors.initials: V
authors.lastname: Vosberg
authors.forename: W
authors.initials: W
authors.lastname: Hobbs
authors.forename: U
authors.initials: U
authors.lastname: Breuer
authors.forename: W J
authors.initials: WJ
authors.lastname: Quadakkers
authors.forename: H
authors.initials: H
authors.lastname: Nickel