Abstract
Structural and phase composition of the Ni₃Al intermetallic compound samples are investigated using electrical resistance measurement during a long time annealing at 773 °C in argon atmosphere. The initial and final state is studied by SEM, TEM and EDAX. Isothermal measurement of electrical resistance during the annealing indicates two stages of oxide formation. Exchange of the argon atmosphere for the hydrogen one causes a jump of electrical resistance explained by interaction of the oxide with hydrogen. Study of the structure shows that two types of Al₂O₃ are formed: hexagonal β-Al₂O₃ and trigonal δ-Al₂O₃.

Key words
intermetallic compound, Ni₃Al, oxidation, electrical resistance, structure, SEM, TEM

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