抄録
Transmission electron microscope observation has been made on the martensite of Fe-10.3% Al-1.50% C steel, with the following results: (1) the martensite gives the diffraction pattern of a body-centred tetragonal lattice with extra spots. These spots are coincident in position with those of the superlattice produced by the Bain distortion from the parent lattice which was assumed to be of the Cu3Au type; (2) it has fine twin faults and stacking faults of the {112} type and not of the {121} type; and (3) the martensite crystals are generally wedge-shaped but some of them have a lamellar structure which consists of two variants having the c-axes approximately perpendicular to each other.
