N.Ya.Rokhmanov
Received February 15, 1999
Comparative investigations of mechanical relaxation spectrum
of vacuum-induction melted Fe-31 %(at.) Al and Fe3Al
alloys containing carbon, have been carried out. Increasing Al
content up to values exceeding the stoichiometrical Fe3Al
composition and extension of temperature interval of internal friction
(IF) measurement allow to reveal an additional IF maximum with the
activation energy H = 147.8 kJ/mol in the alloy Fe-31 %(at.)
Al at the frequency f = 67.5 Hz between Snoek and Zeener
peaks. Its mechanism is attributed to the stress-induced diffusion
of carbon atoms through B type octahedral interstices in the
structure with the B2 type (FeAl) short-range order.