The microstructure of annealed at 1200°C and water quenched Co_35+x-Ni_40-x-Al₂₅ (x = 0, 2.5, 5.0) ferromagnetic shape memory alloys has been investigated by optical (OM) and analytical transmission electron microscopy (TEM). The deformed microstructure consisted of elongated grains of martensite and γ phases as observed using polarized OM and Nomarski contrast. The annealing twins were found frequently in the γ phase. The volume fraction of γ phase has been determined using quantitative image analysis method. TEM observations raveled frequent stacking faults within martensite and its teragonality as well as dissociated dislocations within γ phase. The crystallographic relationship between martensite and γ grains has been determined basing on electron diffraction patterns. The elemental mapping technique and chemical point analyses allowed to determine the composition of particulate phases. The measured Al/Co ratio in the β phase of quenched alloys has been shown to be related to M_s temperature.

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