Abstract
Nanometer(nm)-sized particles of Fe-Ni alloys with compositions of 15∼30at.%Ni were studied by lattice imaging and Fourier transform techniques in transmission electron microscopy. The austenite particles exhibited polyhedral shapes faceted with {111}, {100} and {110} planes. which are of low energy density in an fcc structure. On the other hand, the martensite particles were faceted with {110}, (100) and {112} planes. The former two planes are of low energy density in a bcc structure, but the latter is not. Taking account of the Bain correspondence between the two phases, we suggest that the martensite particles are formed simply by the Bain distortion of the austenite particles upon the martensitic transformation.
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