Abstract
The microstructure of ball-milled NiAl30 powder prepared by a proprietary technique was studied in this paper. It appeared that the NiAl30 powder is a heterogeneous mixture of particles containing various fractions of components. SEM and TEM observation showed that substantial part of powder particles exhibit fine lamellar microstructure resulting from severe deformation, fracture and welding in the ball milling process. Lamellar domains are formed by elemental Ni and Al as well as by ordered β-NiAl. Nanocrystalline Ni₂Al₃ was observed, too. No amorphous phase was observed in the studied microstructure.

Key words
NiAl30 ball-milled powder, microstructure, TEM studies, intermetallic phases

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