Crystallization-nitriding process of FeSiB and FeSiBCuNb ribbons: influence of additive (Cu, Nb) pair and nitrogen on structure, magnetic and magnetostrictive parameters

Both conventional thermal treatments (CT-Fs) and nitriding thermochemical t reatments (NTTS) are used to crystallize Fe74Si14B12 and Fe73.5Si13.5B9Cu1N b3 melt spun ribbons. For the FeSiB sample. nitrogen is detected throughout the whole thickness, while nitrogen is observed only in the periphery of t he (Cu-Nb) containing sample. Nitrogen diffusion is related to the crystall ization. The remaining phase in the nanocrystallized FeSiBCuNb sample slows down the nitrogen diffusion. This kind of treatment applicated to FeSiBCuN b sample enables the formation of nanocrystallites with a grain size that i s slightly smaller than that obtained following a CTT. (C) 2001 Elsevier Sc ience B.V. All rights reserved.