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Direct synthesis of Fe-Si-B-C-Cu nanocrystalline alloys with superior soft magnetic properties and ductile by melt-spinning

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Journal of Materials Science & Technology 2022年第13期108卷 186-195页

作者： Xingjie Jia Bojun Zhang Wei Zhang Yaqiang Dong Jiawei Li aina he Run-Wei Li 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 Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China University of Chinese Academy of Sciences Beijing 100049China

Structure,magnetic properties and ductile of melt-spun Fe_(83-x)Si_(4)B_(13-y)C_(y)Cu_(x)(x=0-1.7;y=0-8)alloys were *** addition of 1.7 at.%Cu in a Fe_(83)Si_(4)B_(13) amorphous alloy generates abundantα-Fe crystals by providing nucleation sites,and further C doping promotes the growth of the crystals by suitable turning amorphous-forming ability,hence they increase saturation magnetic flux density(B_(s))and slightly worse magnetic softness of the as-spun *** as-spun Fe_(81.3)Si_(4)B_(7)C_(6)Cu_(1.7) alloy possesses a combined structure of a fully amorphous layer in wheel side surface and predominating nanocrystalline structure with gradually enlargedα-Fe crystal,whose average size and volume fraction are determined as about 12 nm and 32%,respectively,therefore superior soft magnetic properties and ductile with a high B_(s)of 1.74 T,coercivity(H_(c))of 32.7 A/m,effective permeability(μ_(e),at 1 kHz)of 3200 and high relatively strain at fracture(ε_(f))of 3.61%can be achieved directly in this alloy by only using *** annealing at 578 K releases internal stress,promotes the growth of theα-Fe crystals and remains the amorphous layer of the Fe_(81.3)Si_(4)B_(7)C_(6)Cu_(1.7) alloy,then improves the soft magnetic properties and maintains the superior ductile with increasing the B_(s)andμ_(e)to 1.80 T and 14,100,respectively,lowering the H_(c)to9.4 A/m and slightly reducing theε_(f)to 2.39%.The combination of superior soft magnetic properties and ductile and simplified synthesis process entitles the Fe-Si-B-C-Cu nanocrystalline alloys great potentials in high performance electromagnetic applications.

关键词： Fe-based nanocrystalline alloys High saturation magnetic flux density Direct synthesis Melt-spinning Ductile

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Development of soft magnetic amorphous alloys with distinctly high Fe content

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Science China(Physics,Mechanics & Astronomy) 2017年第10期60卷 45-50页

作者： PingBo Chen AnDing Wang ChengLiang Zhao aina he Gang Wang ChunTao Chang XinMin Wang Chain-Tsuan Liu Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China Zhejiang Province Key Laboratory of Magnetic Materials andApplication Technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China Laboratory for Mierostructures Institute of Materials Science Shanghai University Shanghai 200444 China Center for Advanced Structural Materials Department of Mechanical and Biomedical Engineering College of Science and Engineering City University of Hong Kong Hong Kong 999077 China

This paper reports on the preparation of Fe82.7-85.7Si2-4.9B9.2-11.2P1.***.2.7C0,8 soft magnetic amorphous alloys with a distinctly high Fe content of 93.5-95.5 wt.% by component design and composition adjustment. All alloys can be readily fabricated into completely amorphous ribbon samples with good surface quality by the single copper roller melt-spinning method. These alloys show good bending ductility and excellent magnetic properties after annealing, i.e., low coercivity （he） of 3.3-5.9 A/m, high permeability （μe） of 5000-10000 and high flux saturation density （Bs） of 1.63-1.66 T. The mechanism of the good glass forming ability （GFA）and soft-magnetic properties are explored. The amorphous alloys with the high Fe content comparable to that of the desired high Si alloy can be promising candidates for the potential application in electric devices.

关键词： metallic glasses alloy design annealing magnetic properties shear band

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heterostructured crystallization mechanism and its effect on enlarging the processing window of Fe-based nanocrystalline alloys

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Journal of Materials Science & Technology 2021年第9期68卷 53-60页

作者： Tao Liu aina he Fengyu Kong Anding Wang Yaqiang Dong Hua Zhang Xinmin Wang Hongwei Ni Yong Yang The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081China GAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan430081China Department of Materials Science and Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong Kong Special Administrative RegionChina

The harsh melt-spinning and annealing processes of high saturation magnetization nanocrystalline softmagnetic alloys are the biggest obstacles for their industrialization. here, we proposed a novel strategy to enlarge the processing window by annealing the partially crystallized precursor ribbons via a heterostructured crystallization process. The heterostructured evolution of Fe_(84.75)Si_(2)B_(9)P_(3)_(C0.5)Cu_(0.75)(at.%)alloy ribbons with different spinning rate were studied in detail, to demonstrate the gradient nucleation and grain refinement mechanisms. The nanocrystalline alloys made with industrially acceptable spinning rate of 25-30 m/s and normal annealing process exhibit excellent magnetic properties and fine nanostructure. The small quenched-in crystals/clusters in the free surface of the low spinning rate ribbons will not grow to coarse grains, because of the competitive grain growth and shielding effect of metalloid elements rich interlayer with a high stability. Avoiding the precipitation of quenched-in coarse grains in precursor ribbons is thus a new criterion for the composition and process design, which is more convenient than the former one with respect to the homogenous crystallization mechanism, and enable us to produce high performance nanocrystalline soft-magnetic alloys. This strategy is also suitable for improving the compositional adjustability, impurity tolerance, and enlarging the window of melt temperature,which is an important reference for the future development of composition and process.

关键词： Nanocrystalline alloy Processing window Surface crystallization Soft-magnetic property heterostructured crystallization

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Influence rules of early transition elements on rapid solidified structure and nanocrystallization behaviors of Fe-Si-B-Cu soft magnetic alloys with high Cu content

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Journal of Materials Science & Technology 2024年第17期184卷 157-166页

作者： Xingjie Jia Yaqiang Dong Wei Zhang Ling Zhang Yanqiu Li aina he Jiawei Li Wenjun Wang Baogen Shen 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 Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China University of Chinese Academy of Sciences Beijing 100049China Niobium Product Department CITIC Metal Company LimitedBeijing 100004China

Unique rapid solidified structure and nanocrystallization mechanism enable the Fe-based nanocrystalline alloys with high Cu content excellent soft magnetic properties and good manufacturability,and also results in unusual phenomena in terms of alloying *** the present work,we systematically studied the influence rules of early transition elements on the rapid solidified structure and nanocrystallization behaviors of Fe-Si-B-Cu soft magnetic alloys with high Cu content and explored the related *** terms of rapid solidified structure,the additions of early transition elements always inhibit the for-mation of pre-existingα-Fe crystals even eliminate them,and the additions that could produce larger atomic mismatch parameter(δ)and negative mixing enthalpy(△H_(mix))show stronger *** terms of nanocrystallization behaviors,the increases inδand negative△H_(mix) weaken the competitive growth between the pre-existing nanocrystals during annealing and then coarsen the nanostructure of the an-nealed alloys and deteriorate their magnetic softness,while the excessive increases inδand negativeHmix could significantly suppress the growth ofα-Fe crystals by diffusion inhibition during annealing and thus remarkable refine the nanostructure of the annealed alloys and improve their magnetic softness.

关键词： Nanocrystalline soft magnetic alloys Early transition elements Rapid solidified structure Nanocrystallization behaviors Pre-existingα-Fe crystals

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Ultrathin, flexible, and high-strength Ni/Cu/metallic glass/Cu/Ni composite with alternate magneto-electric structures for electromagnetic shielding

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Journal of Materials Science & Technology 2021年第22期81卷 43-50页

作者： Zenan Ma Jiawei Li Jijun Zhang aina he Yaqiang Dong Guoguo Tan Mingqiang Ning Qikui Man Xincai Liu Faculty of Materials Science and Chemical Engineering Ningbo UniversityNingbo315211China CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo315201China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu610054China

Electromagnetic interference(EMI)shielding materials with ultrathin,flexible,superior mechanical and thermal management properties are highly desirable for smart and wearable ***,ultrathin and flexible Ni/Cu/metallic glass/Cu/Ni(Ni/Cu/MG)multilayer composite with alternate magnetic and electrical structures was designed via facial electroless plating of Cu and Ni on an Fe-based metallic *** resultant 0.02 mm-thick Ni/Cu/MG composite displays a superior EMI shielding effectiveness(EMI SE)of 35 dB and a great EMI SE/t of 1750 dB/mm,which is greater than those of composites with monotonous multilayer or homogeneous *** improved EMI SE originates from the massive ohmic losses,the enhanced internal reflection/absorption,and the abundant interfacial polarization ***,Ni/Cu/MG exhibits a high tensile strength of up to 1.2 GPa and outstanding mechanical stability,enabling the EMI SE remains unchanged after 10,000 times of ***,Ni/Cu/MG has excellent Joule heating characteristics and thermal stability,which is very suitable for heating components of wearable hyperthermia devices.

关键词： Electromagnetic shielding Thermal management Mechanical properties Fe-based metallic glasses Alternate magnetic and electrical structures

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Novel CoFeAlMn high-entropy alloys with excellentsoft magnetic properties and high thermal stability

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Journal of Materials Science & Technology 2023年第22期153卷 22-31页

作者： Wei Gao Yaqiang Dong Xingjie Jia Liping Yang Xubin Li Shouding Wu Ronglin Zhao Hang Wu Qiang Li aina he Jiawei Li Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology CAS Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo 315201China School of Physical and Technology Xinjiang UniversityUrumqiXinjiang 830000China University of Chinese Academy of Sciences Beijing 100049China

High-entropy alloys(heAs),which are composed of 3d transition metals such as Fe,Co,and Ni,exhibit an exceptional combination of magnetic and other properties;however,the addition of non-ferromagnetic elements always negatively affects the saturation magnetization strength(M s).Co_(4)Fe_(2)Al_(x)Mn_(y) alloys were designed and investigated in this study to develop a novel heA with excellent soft magnetic *** Co_(4)Fe_(2)Al_(1.5)Mn_(1.5) heA possesses the highest M s of 161.3 emu g^(-1) thus far reported for magnetic heAs,a low coercivity of 1.9 Oe,a high electrical resistivity of 173μΩ cm,a superior thermal stability up to 600℃,which originates from the novel microstructure of B2 nanoparticles distributed in a DO_(3) matrix phase,and the crucial transition of Mn from antiferromagnetism to ferromagnetism with the assistance of *** Co_(4)Fe_(2_)Al_(1.5)Mn_(1.5) heA was selected to produce micron-sized powder and soft magnetic powder cores(SMPCs)for application in the exploration *** SMPCs exhibit a high stable effective perme-ability of 35.9 up to 1 MHz,low core loss of 38.1 mW cm^(-3)(@100 kHz,20 mT),and an excellent direct current(DC)bias performance of 87.7%at 100 *** study paves the way for the development of soft magnetic heAs with promising applications as magnetic functional materials.

关键词： High-entropy alloys Soft magnetic powder cores Magnetic properties High saturation magnetization Magnetic domain

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Excellent thermal stability and high energy storage performances of BNT-based ceramics via phase-structure engineering

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Journal of Materiomics 2023年第6期9卷 1015-1023页

作者： Mingkun Wang Tian Bai aina he Zhongbin Pan Jinghao Zhao Luomeng Tang Zhihe Zhao Jinjun Liu Shushuang Li Weixing Xia Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China University of Chinese Academy of Science Beijing100049China School of Materials Science and Chemical Engineering Ningbo UniversityNingbo315211China Ningbo Productivity Promotion Center Ningbo315040China

herein,a novel strategy for regulating the phase structure was used to significantly enhance the recoverable energy storage density(Wrec)and the thermal stability via designing the(1-x)[(Bi_(0.5)Na_(0.5))_(0.7)Sr_(0.3)TiO_(3)]-xBiScO_(3)((1-x)BNST-xBS)relaxor ferroelectric *** incorporation of BS into BNST ceramics markedly increases the local micro-structure disorder,causing a high polarization and inhibiting polarization hysteresis for 0.95BNST-0.05BS ceramics,leading to a large Wrec of 5.41 J/cm^(3)with an ideal efficiency(h)of 78.5%.Meanwhile,transmission electron microscope(TEM)results further proved that the nano-domain structure and the tetragonal(P4bm)phase superlattice structure of 0.95BNST-0.05BS ceramics possess an excellent thermal stability(20-200℃).An outstanding Wrec value of 3.18×(1.00±0.03)J/cm^(3)and an h value of 74.500±0.025 are achieved under a temperature range from 20℃to 200℃.This work provides a promising method for phase-structure design that can make it possible to apply temperature-insensitive ceramic dielectrics with a high energy storage density in harsh environments.

关键词： Relaxor ferroelectric Energy storage properties Thermal stability Nano-domain

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Microstructure,magnetic domain and dynamic loss of surface-textured Fe-based nanocrystalline alloy

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Journal of Materials Science & Technology 2022年第25期120卷 1-7页

作者： aina he Jiawei Li Mingkun Wang Anding Wang Yao Xiao Yaqiang Dong Hai Guo Rongrong Jiang Weixing Xia Lihong Dong Haidou Wang Jianya Ge CAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China University of Chinese Academy of Sciences Beijing 100049China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China Ningbo Zhongke B Plus New Materials Technology Co. LtdNingbo 315201China National Key Lab for Remanufacturing Army Academy of Armored ForcesBeijing 100072China Jinhua Polytechnic Jinhua 321007China

heterogeneous coarse surface crystallites induced in the industrial Fe-rich nanocrystalline alloy is an obstacle for high-frequency and high-power commercial ***,the phase,crystal orientation,nanostructure and magnetic domain evolution of the surface-crystallized Fe-rich alloy were systematically *** and inverse pole figures analysis confirms that the DOordered dendriticcrystallites bear-oriented fiber texture before and after annealing at the free surface,while ultrafine nanocrystals are randomly oriented in the interior and wheel surface after *** compared to zero magnetic-field-annealing,the transverse magnetic-field-annealing induces weakly oriented fiber texture and relatively uniform dendritic-crystallites at the surface,and uniform anisotropy in the interior and surface,which promotes smooth wall motion at the surface and magnetization rotation in the *** synergetic effect reduces the excess loss and leads reduction in dynamic loss at 1.0 T and10 kHz by 36%.

关键词： Nanocrystalline alloy Crystallization Texture Magnetic domain Dynamic loss

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Magnetic-electric composite coating with oriented segregated structure for enhanced electromagnetic shielding

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Journal of Materials Science & Technology 2022年第1期96卷 11-20页

作者： Jijun Zhang Zexuan Wang Jiawei Li Yaqiang Dong aina he Guoguo Tan Qikui Man Bin Shen Junqiang Wang Weixing Xia Jun Shen Xin-min Wang CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China University of Chinese Academy of Sciences Beijing 100049China Ningbo Key Laboratory of Polymer Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China

Manipulation of the internal architecture is essential for electromagnetic interference(EMI)shielding performance of metal-based coatings,which can address the electromagnetic pollution in large-size,complex geometries,and harsh *** this work,oriented segregated structure with conductive networks embedded in magnetic matrix was achieved in Fe-based amorphous coatings via Ni-Cu-P functionalization of(Fe_(0.76)Si_(0.09)B_(0.1)P_(0.05))_(99)Nb_(1)amorphous powder precursors and then thermal spraying them onto aluminum(Al)*** from the unique magnetic-electric structure,the coating@Al composite delivered prominent EMI shielding *** EMI shielding effectiveness(SE)of modified coating@Al composite is~41 dB at 8-12 GHz,doubling the value of Al substrate and is 15 dB greater than that of Ni-Cu-P-free coating@Al *** analysis showed that the introduced Ni−Cu−P insertions forcefully suppress the serious oxidation of the magnetic precursors during thermal spraying and form a dense conductive network in the magnetic *** holography observation and electromagnetism simulation clarified that the modified coating can effectively trap and attenuate the incident radiations because of the electric loss from Ni−Cu−P conductive network,magnetic loss from Fe-based amorphous coating,and the electromagnetic interactions in the oriented segregated ***,the optimized thermal isolation and mechanical properties brought by structural improvement enable the coating to shield complex parts in thermal shock and mechanical loading *** work gives an insight on the design strategies for metal-based EMI shielding materials and enriches the fundamental understanding of EMI shielding mechanisms.

关键词： Fe-based amorphous coatings Ni-Cu-P Oriented segregated structure Electromagnetic shielding

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Nano-heterogeneity-stabilized and magnetic-interaction-modulated metallic glasses

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Science China Materials 2021年第7期64卷 1813-1819页

作者： Chengliang Zhao Anding Wang aina he Chuntao Chang Chain-Tsuan Liu School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808China Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Department of Materials Science and Engineering College of Science and EngineeringCity University of Hong KongHong Kong 999077China

Because of their boundary-free and long-rangedisordered microstructure,Fe-based metallic glasses(MGs)exhibit an ultra-low pinning effect on the magnetic domain and unparalleled soft-magnetic properties[1-3],and thus a... 详细信息

关键词：非晶形成能力金属玻璃软磁性能非晶合金合金设计强化机制饱和磁感应强度磁相互作用

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