In this study, austenite-martensite phase transformations which are formed by cooling effect in Fe-30% Ni-0⋅ ⋅2% Mn alloy are investigated with Mössbauer spectroscopy and scanning electron microscopy. The single peak of the paramagnetic phase and the six peaks of the ferromagnetic phase of Fe-30% Ni-0⋅ ⋅2% Mn alloy were observed in the Mössbauer spectrum. The internal magnetic field strength of ferromagnetic martensite phase was determined as 33⋅ ⋅8 T and the isomer shift values were determined as-0⋅ ⋅11 mm⋅ ⋅sec-1 and-0⋅ ⋅06 mm⋅ ⋅sec-1 , respectively, for the austenite and martensite phases. In this alloy, athermal transformation was observed. The results obtained are in agreement with literature.

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