The paper concerns the determination of the role of the γ-phase particles on the microstructure and properties of Co-Ni-Ga alloys. The investigations cover the alloys of wide range of chemical composition. They show different microstructures: single phase martensite BCT( Body Centered Tetragonal) lattice with c/a >1 (a), two phase B2 +γ (b) or BCT + γ (b). The particle analysis was performed to determine the amount of the g-phase in the studied alloys. The compression test on prism samples proved that the increase of the g-phase volume fraction significantly improves the strength and plasticity of the alloys. Thus the presence of the γ-phase precipitates cause the decrease of the brittleness observed in the single phase martensitic alloys. Additionally, the influences of the orientation of the grain boundary precipitates on the mechanical properties were studied. TEM observations were preformed for specimens before and after deformation to reveal the mechanism of the γ-phase deformation. Studies of the para – to ferromagnetic and martensitic transformation were carried using different methods .

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