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Acta Metallurgica Sinica(English Letters) 2022年第2期35卷 235-242页

作者： Li-Cheng Wu Yan-Hui Li Xing-Jie Jia Ai-Na He Wei Zhang Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology CAS Key Laboratory of Magnetic Materials and DevicesNingbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo 315201China

The effects of ribbon thickness(t)on the structure and magnetic properties of a fe_(82.3)B_(13)Cu_(1.7)Nb_(3) alloy in melt-spun and annealed states have been *** the t from 15 to 23μm changes the structure of the melt-spun ribbons from a single amorphous phase to a composite with denseα-fe nanograins embedded in the amorphous *** grain size(D_(α-fe))of theα-fe near the free surface of the ribbon is about 6.7 nm,and it gradually decreases along the cross section toward the wheel-contacted *** increasing the t to 32μm coarsens the D_(α-fe) near the free surface to 15.2 nm and aggravates the D_(α-fe) ramp along the cross *** annealing,the ribbon with t=15μm has relatively largeα-fe grains with D_(α-fe)>30 nm,while the thicker ribbons possessing the pre-existing nanograins form a finer nanostructure with D_(α-fe)fective permeability at 1 kHz of 15,*** ribbon with t=32μm has a slightly larger coercivity due to the lower structural *** formation mechanism of the fine nanostructure for the ribbons with suitable t has been discussed in terms of the competitive growth effect among the pre-existingα-fe nanograins.

关键词： fe-based nanocrystalline alloy Microstructure Pre-existingα-fe nanograin Soft magnetic properties Ribbon thickness

Reduction of High-Frequency Core Loss of a fe_(77.2)Si_(11)B_(8.5)Cu_(0.8)Nb_(2.5)Soft Magnetic nanocrystalline alloy by Minor alloying

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Acta Metallurgica Sinica(English Letters) 2024年第11期37卷 1984-1992页

作者： Shushen Guo Yanhui Li Yibing Zhang Lu Yang Wei Zhang Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian116024China Southwest Institute of Applied Magnetics Mianyang621000China

Enhancing saturation magnetic flux density(Bs)while reducing high-frequency core loss in Finemet-type nanocrystalline alloys is of great significance in achieving the miniaturization,high-frequency,and energy-saving of modern power electronic *** this work,we first designed a high-Bs fe_(77.2)Si_(11)B_(8.5)Cu_(0.8)Nb_(2.5)alloy by appropriately reducing the non-magnetic elements in typical Finemet nanocrystalline alloys,and subsequently alloyed 2 at%Co,Al,and Mo,*** effects of alloying elements on structure and static and high-frequency magnetic properties were *** results reveal that,alloying Al or Mo reduces the averageα-fe grain size(Dα-fe)in the nanocrystalline alloys,while Co exhibits a slight *** added Al or Mo results in decreases in both the Bs and coercivity(Hc)of the nanocrystalline alloys,whereas Co increases the Bs without changing Hc,and meanwhile,all alloying elements show minimal effects on effective permeability(μe).Furthermore,the addition of Co,Al,or Mo lowers the core loss(Pcv)at 0.2 T/100 kHz of the based nanocrystalline alloy with reductions of 10.9%,29.6%,and 26.8%,respectively.A fe_(75.2)Si_(11)B_(8.5)Cu_(0.8)Nb_(2.5)Al_(2)nanocrystalline alloy exhibits outstanding soft magnetic properties with Bs,Hc,μe at 10 kHz and 100 kHz,and Pcv at 0.2 T/100 kHz of 1.34 T,0.8 A/m,27,400,18,000,and 350 kW/m3,*** reduction in Pcv is primarily attributed to the decreased eddy current losses,originating from the increased electrical resistivity by elements alloying.

关键词： fe-based nanocrystalline alloy fe-Si-B-Cu-Nb alloy Soft magnetic property High-frequency loss Electrical resistivity

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

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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

Microstructure and magnetic properties of fe81.3Si4B13Cu1.7 nanocrystalline alloys with minor Nb addition

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Journal of Iron and Steel Research International 2018年第6期25卷 614-618页

作者： Xiang-cheng Ren Yan-hui Li Xing-jie Jia Zhi-yong Qiu Guo-qiang Xie Wei Zhang Key Laboratory of Solidification Control and DigitalPreparation Technology (Liaoning Province) School ofMaterials Science and Engineering Dalian University ofTechnology Dalian 116024 Liaoning China School of Materials Science and Engineering HarbinInstitute of Technology (Shenzhen)Shenzhen 518055 Guangdong China

The amorphous matrix contAlning dispersive high number density （Na） α-fe nuclei with average grAln sizes （D） of 4.3-6.2 nm was formed in the melt-spun fe81.3-xSi4B13Cu1.7Nbx （x = 0-2） alloys, and the Nd and D values reduce with increase in the Nb content. The fine nanocrystalline structure with α-fe grAlns of 14.0-21.6 nm in size was obtAlned for the annealed alloys, which showed high saturation magnetic flux density of 1.60-1.77 T and low coercivity （He） of 7.1-17.0 A/m. Addition of minor Nb significantly expands the optimum annealing temperature range for obtAlning good soft magnetic properties, while coarsens the α-fe grAlns, leading to a slight increase in the Hc. 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 α-fe nuclei of the alloys.

关键词： fe-based nanocrystalline alloy Soft magnetic property Cu content α-fe nuclei Nb alloying

The influence of Si substitution on soft magnetic properties and crystallization behavior in fe_(83)B_(10)C_(6-x)Si_xCu_1 alloy system

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Science China(Technological Sciences) 2012年第9期55卷 2416-2419页

作者： FAN XingDu MEN He MA AiBin SHEN BaoLong College of Mechanics and Materials Hohai UniversityNanjing 210098China Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Key Laboratory of Magnetic Materials and DevicesNingbo Institute of Material Technology&EngineeringChinese Academy of SciencesNingbo 315201China

In this study, the soft magnetic properties and crystallization behavior of fes3B10C6-xSixCul （x=0-4） nanocrystalline alloys prepared by annealing the melt-spun amorphous ribbons have been investigated. It is found that in the fe83B10C6-xSixCU1 alloy system, the coercivity （Hc） decreases slightly with increasing Si addition and exhibits a minimum value with composition of x = 2, while the effective permeability （Ue） shows an opposite variation trend. The saturation magnetic flux density （Bs） shows a slightly decreasing trend owing to the decreasing volume fraction of nanocrystalline phase. The fe83B10CaSi2Cu1 nanocrystalline alloy exhibits excellent soft magnetic properties with a high Bs of 1.78 T, high ue of 13 600 and low Hc of 4 A/m.

关键词： soft magnetic alloy fe-based nanocrystalline alloy high saturation magnetic flux density low coercivity

fePCCu nanocrystalline alloys with excellent soft magnetic properties

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Science China(Technological Sciences) 2012年第12期55卷 3419-3424页

作者： JIN YunLong FAN XingDu MEN He LIU XinCai SHEN BaoLong Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Key Laboratory of Magnetic Materials and DevicesNingbo Institute of Material Technology&EngineeringChinese Academy of SciencesNingbo 315201China The School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315201China

The effect of Cu addition on crystallization behavior and soft magnetic properties of fe84-xP10C6Cux （x = 0-1.15） alloys was investigated. Low-cost fePCCu nanocrystalline alloys dispersed with ct-fe phase with an average grain size of 15-35 nm were obtained by appropriately annealing the melt-spun ribbons at 683 K for 5 min. The fe83.25P10C6Cu0.75 nanocrystalline alloy ex- hibits a high Bs of 1.65 T, low Hc of 3.3 A/m and high μc at 1 kHz of 21 100, which is superior to the traditional fePC soft magnetic alloys. The core loss is as low as 0.32 W/kg at 1.0 T and 50 Hz, which is 60% that of nonoriented fe 6.5 mass% Si-steel. It is encouraging to synthesize this fe-based nanocrystalline alloy with excellent soft-magnetic properties even using commercially industry-grade raw materials, which is promising for the future industrial applications.

关键词： soft magnetic ahoy fe-based nanocrystalline alloy soft magnetic properties low core loss