Structural differences between the nanocrystalline soft magnetic Fe73.5Si13.5B9Nb3Cu1 and Fe86Zr7B6Cu1 alloys

Á Cziráki, I. Gerócs, L. K. Varga, I. Bakonyi, U. Falke, H. D. Bauer, K. Wetzig

Research output: Contribution to journalArticle

1 Citation (Scopus)


Initial permeability measurements on nanocrystalline soft magnetic Fe73.5Si13.5B9Nb3Cu1 and Fe86Zr7B6Cu1 alloys revealed that, in agreement with previous studies, in the optimum annealed state, the Fe-Si-B-Nb-Cu alloy exhibits its much better soft magnetic behaviour than the Fe-Zr-B-Cu alloys. On the other hand, the density remained almost unchanged upon the amorphous-nanocrystalline transformation in Fe-Zr-B-Cu whereas a significant increase (∼ 2%) occurred in Fe-Si-B-Nb-Cu. From X-ray diffraction and transmission electron microscopy studies, the amount of the residual amorphous phase, the lattice parameter, the internal stresses, and the grain morphology of the crystallized phase were found to evolve differently with increasing annealing temperature for the two alloys whereas their grain sizes were nearly the same for a given annealing temperature. It is pointed out that all these observed differences may also contribute to the differences in their soft magnetic behaviour. Furthermore, an analysis of the phases in the fully annealed state gave some hints to explain the different behaviour of density upon crystallization.

Original languageEnglish
Pages (from-to)21-27
Number of pages7
JournalZeitschrift fuer Metallkunde/Materials Research and Advanced Techniques
Issue number1
Publication statusPublished - Jan 2002


  • Alloys Fe-Si-B-Nb-Cu and Fe-Zr-B-Cu
  • Microstructure
  • Nanocrystalline alloys
  • Soft magnetic alloys
  • Transmission electron microscopy
  • X-ray diffraction

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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