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Journal of Electron Microscopy 48(4): 387-391 (1999)
© 1999 Oxford University Press

Transmission electron microscopy and electron diffraction study on structure and phase transformation of nanometre-sized Fe-15-30 at. % Ni alloy particles

Koji Asaka*,, Yoshihiko Hirotsu and Tsugio Tadaki1

The Institute of Scientific and Industrial Research, Osaka University 8-1 Mihoga-oka, Ibaraki, Osaka 567-0047, Japan
1Faculty of Science, Osaka Women's University 2-1 Daisen-cho, Sakai, Osaka 590-0035, Japan

*To whom correspondence should be addressed. E-mail: asaka22{at}sanken.osaka-u.ac.jp

Structure and phase transformations of nanometre-sized particles of Fe-Ni alloys in the composition range from 15 to 30 at.% Ni were studied by means of transmission electron microscopy and electron diffraction. The nanometre-sized particles were prepared by vacuum evaporation of master alloys onto amorphous alumina films at room temperature. The deposited films of all the alloys were composed of islands of a few nm sizes with amorphous-like structures. The islands were changed upon heating at around 673 K into crystalline particles with several nanometre diameter sizes consisting of a mixture of fee and bec phases or an fee single phase, depending on composition of the master alloys. When cooled to room temperature after austenitization at higher temperatures, the particles of the alloy with 30 at.% Ni remained fee, and even those of alloys with compositions less than 25 at.% Ni only partly underwent the martensitic transformation. The austenite and martensite particles exhibited polyhedral shapes with facets. The stabilization of austenite in the nanometre-sized particles was discussed in terms of the surface free energy.transmission electron microscopy

Keywords     electron diffraction, nanometre-sized particles, martensitic transformation, austenite stabilization, Fe-Ni alloy

Received     16 October 1998, accepted 8 January 1999


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