Release Time:2019-03-12  Hits:

Indexed by: Journal Article

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: 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.