IRREVERSIBLE RELAXATION PROCESSES IN AMORPHOUS CO71.5FE2.5MN2MO1SI9B14 RIBBONS

The irreversible structure relaxation of the amorphous near-zero magne tostrictive Co71.5Fe2.5Mn2Mo1Si9B14 alloy was studied by means of the isothermal magnetic after-effect of the initial permeability (disaccom modation) and isothermal dilatometric measurements. Studies were perfo rmed at T = 379-520 K in the time interval between t1 = 1 s and t2 = 2 -25000 s. Assuming first-order kinetics of the relaxation process, the changes of the normalized variations of the MAE and the isothermal sh rinkage are described. The distributions of activation energies P(Q) w ere evaluated by the Hesse-Rubartsch method. Three-mode spectra of the activation energies were obtained, which point to the existence of th ree different relaxation processes.