Abstract
Isothermal oxidation of an alloy formed by dendrites of Ni₃Al intermetallic phase and NiAl + Ni₃Al "matrix" has been performed and the oxidation product structure studied. Aluminium and oxygen with small amount of nickel were identified by EDX analyses in the oxide scale created on the surface of the alloy after 50 hour oxidation in air at 1373 K. γ- and α-Al₂O₃ modifications and crystals of spinel NiAl₂O₃ were found by the selected area electron diffraction method on a pre-thinned foil after short-term oxidation (5 min).

Key words
isothermal oxidation, EDX analyses, γ- and α-Al₂O₃ modifications, Ni₃Al intermetallic phase, structual properties

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