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J. Phys. IV France
Volume 07, Numéro C5, November 1997
IVth European Symposium on Martensitic Transformations
Page(s) C5-119 - C5-124
IVth European Symposium on Martensitic Transformations

J. Phys. IV France 07 (1997) C5-119-C5-124

DOI: 10.1051/jp4:1997518

HREM Observations of Continuously Changing Intermediate Structures between f.c.c. and b.c.c. at the Austenite-Martensite Interface

K. Ogawa, T. Kikuchi and S. Kajiwara

National Research Institute for Metals, 1-2-1 Sengen, Tsukuba 305, Japan

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 which the Olson-Cohen nucleation model is based is found to be inadequate to explain the present observations.

© EDP Sciences 1997