J. Phys. IV France
Volume 112, October 2003
Page(s) 327 - 331

J. Phys. IV France
112 (2003) 327
DOI: 10.1051/jp4:2003894

Connection between fine atomic crystal structure and martensite gamma-alpha transformations and properties of Fe-Ni thin films

Yu.L. Rodionov1 and V.G. Kazakov2

1  Central Research Institute for Iron and Steel lndustry, 2$^{\rm nd}$ Baumanskaya Str. 9/23, 107005 Moscow, Russia
2  Ircutsky State University, Problem Laboratory, Nijnaya Naberejnaya 6, 664046 Ircutsk, Russia

The processe of the fine atomic structure transformations, martensite transformations and properties of the thin Fe-Ni (25-50% Ni) films (0.06-2.0  $\mu$m.) were studied by means of x-ray diffraction, nuclear gamma resonance, electron and light microscope. The general physical picture of the low temperature (<400°C) atomic- structure transformation of the iron-nickel films containing the high defect density was found.

The influence at the martensite transformations and the magnetic and thermal properties of the thickness, grain size and the fine atomic crystal structure of the thin Fe-Ni films were studied.

The connection between $\Delta {\rm M_s}$ and the concentration deviation from average value was found.

The new phenomenon, namely low temperature ( $\le 20^\circ$C) isothermal reverse $\alpha\to\gamma$ martensitic transformation was discovered.

The influence of the concentration inhomogenieties and the short-range ordering occuring in the thin Fe-Ni films at the magnetic and thermal properties was studied.

© EDP Sciences 2003