Abstract
In order to clarify the role of alloying elements in Cu-free nanocrystalline Fe-Nb-B soft magnetic alloys, we have examined the kinetics of primary crystallization, the microstructure after primary crystallization, the changes in Curie temperature ( T c) and the hyperfine interactions of the amorphous phase upon primary crystallization in Fe 86 − xNb x B 14( x = 0, 2, 4, 5, 6 and 8) alloys. The mean grain size after primary crystallization decreased drastically in the x range 4–6 at.%. The kinetic analysis of the primary crystallization reaction showed that the decrease in the grain size can be attributed to the commencement of homogeneous nucleation. T c of the amorphous phase increased with the B enrichment during primary crystallization. T c decreased with Nb content and the hyperfine field distribution of the residual amorphous phase after primary crystallization for the x = 6 sample showed the presence of a non-magnetic component. These results suggest that Nb plays a role in the formation of the nanostructure by accelerating nucleation, as does B in the generation of a strong intergranular magnetic coupling, through increasing the T c of the residual amorphous phase.
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