FORMATION OF NANOCRYSTALS IN AMORPHOUS FE73.5NB3CU1SI13.5B9 RIBBONS PRODUCED WITH DIFFERENT QUENCHING RATE

The role of quenching conditions on the formation of nanocrystals duri ng crystallization of amorphous Fe73.5Nb3Cu1Si13.5B9 is investigated. Different quenching rates have been applied to the melt by varying the wheel surface velocity in the planar flow casting process. Magnetic a nd mechanical properties of as-quenched samples are strongly influence d by quenching conditions. The phase transformation induced by anneali ng of the various samples leads to similar microstructure and comparab le initial magnetic permeability and fracture strain. The role of init ial strain and structural relaxation processes on final properties of the samples is briefly discussed.