The microstructure and magnetic properties of two ferromagnetic alloys with composition as: Co₃₅Ni₃₇Al₂₈ and Co₃₇Ni₃₅Al₂₈ (in at. %) were investigated by optical microscopy (OM), analytical transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM). The plastically deformed alloys up to 45% were then heat treated in order to promote the martensitic transformation. Differential scanning calorimeter (DSC) was used for determination of characteristic temperatures of transformation, and it was observed a drop of M_s temperature due to the increase of Co content in alloys. The elongated twined grains of size of about 200 mm and small precipitation of g phase has been identified by OM techniques. TEM observations allowed identifying the L1₀ non modulated martensite within elongated grains and small amount of ordered g (g’) was still observed after heat treatment. The elemental mapping technique and chemical point analyses allowed determining the composition of particulate phases. The VSM measurements performed for two directions of samples i.e. parallel and perpendicular to the rolling direction, allowed determining the phase transition temperatures, Curie temperature and basic magnetic properties of investigated alloys.

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