Nucleation and growth in martensitic transformations of ordered Fe3Pt alloys

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Behavior of nucleation and growth of thermoelastic martensitic transformations in Fe3Pt was examined by electrical resistance measurements, X-ray diffractometry, optical microscopy, andin situ TEM observation. The results suggest that fcc-bct and fcc-fct martensitic transformations of the alloy are independent from each other. The nucleation behavior of bct martensite varies with the decrease ofM s (bct) temperature. The soft mode of the elastic constant,C′, is considered to exert an influence on the nucleation behavior of fcc-bct transformation, such that the tweed contrast is observed in localized narrow regions in the fcc matrix where bct martensite successively nucleates. This localized tweed structure was induced by the transformation shear associated with the fcc-bct transformation at theM s temperature and enhanced by the lattice softening.

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