MAGNETIC-PROPERTIES OF FE73.5CU1NB3SI13.5B9 ALLOY COMPACTED BY A SHOCK-WAVE TECHNIQUE

The magnetic hysteresis properties of compacted amorphous, nanocrystal line and crystalline Fe73.5Cu1Nb3Si13.5B9 alloys were measured using t he fluxmetric method in the DC mode and in the AC mode over a frequenc y range of 10 Hz to 1 kHz. The powder material was compacted using the shock-wave technique. X-ray studies showed that the microstructure of the samples remains amorphous during the compaction. The maximum DC f lux density of a nanocrystalline sample annealed at 550 degrees C was 0.9 T. The AC flux density decreased from 0.72 to 0.65 T as the magnet izing frequency was increased from 10 Hz to 1 kHz. The corresponding i ncrease in total core losses was 1.42-219 W/kg. The results are interp reted on the basis of plastic deformation and consequent stress-induce d anisotropies. (C) 1998 Elsevier Science B.V. All rights reserved.