Relaxation spectrum of ordering carbon-containing alloys Fe-(25-31) % (at.) Al


V.Karazin Kharkiv National University, 4 Svobody Sq., 61077 Kharkiv, Ukraine

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.

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