Fe100-xNix alloys were obtained by a mechanical alloying technique (MA) fro
m elemental metals. The alloys consist of: single body-centered cubic phase
(bcc) at nickel concentrations less than or equal to 22 at.%, single face-
centered cubic phase (Fcc) - at x > 28 at.% and two of these phases - at 22
less than or equal to x less than or equal to 28 at.%. Annealing results i
n formation of single fcc phase structure in the samples with x greater tha
n or equal to 22 at.%. According to the Mossbauer spectrometry data these a
nnealed alloys with 22-28 at.% Ni were not ferromagnetic at room temperatur
e. Cooling austenitic samples in liquid nitrogen as well as mechanical defo
rmation stimulated austenite-marten site transformation accompanied by the
appearance of ferromagnetism. (C) 2001 Elsevier Science B.V. All rights res
erved.