Abstract
Continuous lattice change from f.c.c. to b.c.c. as a function of subnanometric distance is observed near the austenite-martensite interface in an Fe-Ni-Mn alloy transformed isothermally at low temperature. From detailed analysis of such lattice changes, it is concluded that the lattice deformation proposed by Kurdjumov and Sachs is the most appropriate one. The Bogers-Burgers mechanism on whit the Olson-Cohen nucleation model is based is found to he inadequate to explain the present observations.
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