Study of Martensitic Transformation in Evaporated Iron-Nickel Alloy Films by Electron Microscopy and Diffraction

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Abstract
Seven kinds of Fe-Ni alloy films (14.35∼27.1 at% Ni) 500, 1000 and 1500 Å thick were prepared by vacuum evaporation. The films were austenitized by heating and subsequently cooled in liquid nitrogen to induce the martensitic transformation. Electron microscope and diffraction studies showed that repeated twins parallel to (112)b.c.c. were produced. The mean twin plate thickness was 60 Å. The martensite-start temperature is much lower than that for the bulk material, and it falls not only with increasing nickel content but also with decreasing film thickness. The small crystal size of austenite in the evaporated films, which causes a strong interaction between the transformation dislocations and the crystal surfaces, in considered to be responsible for the suppression of the transformation.

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