Title of Paper:Microstructure and magnetic properties of Fe81.3Si4B13Cu1.7 nanocrystalline alloys with minor Nb addition

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Date of Publication:2018-06-01

Journal:JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL

Included Journals:SCIE

Volume:25

Issue:6

Page Number:614-618

ISSN No.:1006-706X

Key Words:Fe-based nanocrystalline alloy; Soft magnetic property; Cu content; alpha-Fe nuclei; Nb alloying

Abstract:The amorphous matrix containing dispersive high number density (N (d)) alpha-Fe nuclei with average grain sizes (D) of 4.3-6.2 nm was formed in the melt-spun Fe81.3-x Si4B13Cu1.7Nb (x) (x = 0-2) alloys, and the N (d) and D values reduce with increase in the Nb content. The fine nanocrystalline structure with alpha-Fe grains of 14.0-21.6 nm in size was obtained for the annealed alloys, which showed high saturation magnetic flux density of 1.60-1.77 T and low coercivity (H (c)) of 7.1-17.0 A/m. Addition of minor Nb significantly expands the optimum annealing temperature range for obtaining good soft magnetic properties, while coarsens the alpha-Fe grains, leading to a slight increase in the H (c). The mechanism of the effect of Cu and Nb elements on the structure and magnetic properties was discussed in terms of the formation and growth of the alpha-Fe nuclei of the alloys.