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Formation and crystallization behavior of Fe-based amorphous precursors with pre-existingα-Fe nanoparticles-Structure and magnetic properties of high-cu-content Fe-Si-B-cu-Nb nanocrystalline alloys

引用

Journal of Materials Science & Technology 2021年第6期65卷 171-181页

作者： Yanhui Li Xingjie Jia Wei Zhang Yan Zhang Guoqiang Xie Zhiyong Qiu Junhua Luan Zengbao Jiao Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Institute for Materials Research Tohoku UniversitySendai 980-8577Japan School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Center for Advanced Structural Materials Department of Materials Science and EngineeringCity University of Hong KongHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Structure,crystallization behavior,and magnetic properties of as-quenched and annealed Fe_(81.3)Si_(4)O_(13)cu_(1.7)(cu1.7)alloy ribbons and effects of Nb alloying have been ***-dimensional atom probe and transmission electron microscopy analyses reveal that high-number-density cu-clusters and Pre-existing Nano-sized a-Fe Particles(PN-a-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 ***-step crystallization behavior associated with growth of the PN-a-Fe and subsequent nucleation and growth of newly-formedα-Fe is found in the primary crystallization stage of the cu1.7 *** number densities of the cu-clusters and PN-a-Fe in melt-spun Fe8_(1.3-x)Si_(4)B_(13)cu_(1.7)Nb_(x)alloys are gradually reduced with enriching of Nb,and a fully amorphous structure forms at 4 at.%Nb,although smaller cu-clusters still *** annealing,2 at.%Nb coarsens the average size(D_(α-F)e)of theα-Fe grains from 14.0 nm of the Nb-free alloy to 21.6 nm,and 4 at.%Nb refines the D_(α-Fe)to 8.9 *** mechanisms of theα-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 oc-Fe growth mechanism in term of the barrier co-contributed by competitive growth among the PN-a-Fe and diffusion-suppression effect of Nb atoms has been proposed.A coercivity(HC)αDα-Fe^(3)correlation has been found for the nanocrystalline alloys,and the permeability is inverse with the H_(C).

关键词： Fe-based nanocrystalline alloy cu-cluster Pre-existingα-Fe nanoparticle Crystallization behavior Soft magnetic property

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