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Substitutions of Co for Fe in FeSiBCuNb nanocrystalline soft magnetic ribbon

Conference Paper


Abstract


  • Substitutions of Co for Fe were made in alloys of base composition Fe73.5Si13.5B9Nb3Cu1 in order to determine the effects on crystallisation, nanocrystalline microstructure and soft magnetic properties. Amorphous ribbons produced by planar flow casting were given 1 h anneals at different temperatures. Ribbons were analysed using X-ray diffractometry, transmission electron microscopy, thermal analysis and bulk magnetic measurements. Thermal analysis indicated that substitution of 3% Co increases the onset temperature for Fe(Si) formation, while substitutions of 3% Co and 6% Co also increase the onset temperature for boride phase formation. On appropriate heat treatment, the nanocrystalline alloy, Fe70.5Co3Si13.5B9Nb 3Cu1 was found to have improved soft magnetic properties over Fe73.5Si13.5B9Nb3Cu1. Substitutions of 6%Co resulted in deterioration in magnetic properties at optimum annealing temperatures, apparently due to coarser Fe(Si) grain sizes. Attempts to prepare alloys with high Co contents (∼20%) resulted in Cu segregation during induction melting, suggesting that Co substitutions promote the formation of a liquid irascibility gap between Fe and Cu in FeSiBCuNb based alloys.

Publication Date


  • 1997

Citation


  • Wexler, D., Bennett, R., Emr, M., & Gilleard, K. P. (1997). Substitutions of Co for Fe in FeSiBCuNb nanocrystalline soft magnetic ribbon. In Materials Science Forum Vol. 235-238 (pp. 729-734).

Scopus Eid


  • 2-s2.0-3743052581

Start Page


  • 729

End Page


  • 734

Volume


  • 235-238

Issue


  • PART 2

Abstract


  • Substitutions of Co for Fe were made in alloys of base composition Fe73.5Si13.5B9Nb3Cu1 in order to determine the effects on crystallisation, nanocrystalline microstructure and soft magnetic properties. Amorphous ribbons produced by planar flow casting were given 1 h anneals at different temperatures. Ribbons were analysed using X-ray diffractometry, transmission electron microscopy, thermal analysis and bulk magnetic measurements. Thermal analysis indicated that substitution of 3% Co increases the onset temperature for Fe(Si) formation, while substitutions of 3% Co and 6% Co also increase the onset temperature for boride phase formation. On appropriate heat treatment, the nanocrystalline alloy, Fe70.5Co3Si13.5B9Nb 3Cu1 was found to have improved soft magnetic properties over Fe73.5Si13.5B9Nb3Cu1. Substitutions of 6%Co resulted in deterioration in magnetic properties at optimum annealing temperatures, apparently due to coarser Fe(Si) grain sizes. Attempts to prepare alloys with high Co contents (∼20%) resulted in Cu segregation during induction melting, suggesting that Co substitutions promote the formation of a liquid irascibility gap between Fe and Cu in FeSiBCuNb based alloys.

Publication Date


  • 1997

Citation


  • Wexler, D., Bennett, R., Emr, M., & Gilleard, K. P. (1997). Substitutions of Co for Fe in FeSiBCuNb nanocrystalline soft magnetic ribbon. In Materials Science Forum Vol. 235-238 (pp. 729-734).

Scopus Eid


  • 2-s2.0-3743052581

Start Page


  • 729

End Page


  • 734

Volume


  • 235-238

Issue


  • PART 2