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Title: | Formation and crystallization behavior of Fe-based amorphous precursors with pre-existing α-Fe nanoparticles—Structure and magnetic properties of high-Cu-content Fe-Si-B-Cu-Nb nanocrystalline alloys | Authors: | Li, Y Jia, X Zhang, W Zhang, Y Xie, G Qiu, Z Luan, J Jiao, Z |
Issue Date: | 28-Feb-2021 | Source: | Journal of materials science and technology (Brazil), 28 Feb. 2021, v. 65, p. 171-181 | Abstract: | Structure, crystallization behavior, and magnetic properties of as-quenched and annealed Fe81.3Si4B13Cu1.7 (Cu1.7) alloy ribbons and effects of Nb alloying have been studied. Three-dimensional atom probe and transmission electron microscopy analyses reveal that high-number-density Cu-clusters and Pre-existing Nano-sized α-Fe Particles (PN-α-Fe) are coexistence in the melt-spun Cu1.7 amorphous matrix, and the PN-α-Fe form by manners of one-direction adjoining and enveloping the Cu-clusters. Two-step crystallization behavior associated with growth of the PN-α-Fe and subsequent nucleation and growth of newly-formed α-Fe is found in the primary crystallization stage of the Cu1.7 alloy. The number densities of the Cu-clusters and PN-α-Fe in melt-spun Fe81.3−xSi4B13Cu1.7Nbx alloys are gradually reduced with enriching of Nb, and a fully amorphous structure forms at 4 at.% Nb, although smaller Cu-clusters still exist. After annealing, 2 at.% Nb coarsens the average size (Dα-Fe) of the α-Fe grains from 14.0 nm of the Nb-free alloy to 21.6 nm, and 4 at.% Nb refines the Dα-Fe to 8.9 nm. The mechanisms of the α-Fe nucleation and growth during quenching and annealing for the alloys with large quantities of PN-α-Fe as well as after Nb alloying have been discussed, and an annealing-induced α-Fe growth mechanism in term of the barrier co-contributed by competitive growth among the PN-α-Fe and diffusion-suppression effect of Nb atoms has been proposed. A coercivity (Hc) ∝ Dα-Fe3 correlation has been found for the nanocrystalline alloys, and the permeability is inverse with the Hc. | Keywords: | Crystallization behavior Cu-cluster Fe-based nanocrystalline alloy Pre-existing α-Fe nanoparticle Soft magnetic property |
Publisher: | Elsevier Editora Ltda | Journal: | Journal of materials science and technology (Brazil) | ISSN: | 2238-7854 | EISSN: | 2214-0697 | DOI: | 10.1016/j.jmst.2020.05.049 | Rights: | © 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Li, Y., Jia, X., Zhang, W., Zhang, Y., Xie, G., Qiu, Z., ... & Jiao, Z. (2021). Formation and crystallization behavior of Fe-based amorphous precursors with pre-existing α-Fe nanoparticles—Structure and magnetic properties of high-Cu-content Fe-Si-B-Cu-Nb nanocrystalline alloys. Journal of Materials Science & Technology, 65, 171-181 is available at https://doi.org/10.1016/j.jmst.2020.05.049. |
Appears in Collections: | Journal/Magazine Article |
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