Structure,magnetic properties and ductile of melt-spun Fe83-xSi4B13-yCyCux(x=0-1.7;y=0-8)alloys were investigated.The addition of 1.7 at.％Cu in a Fe83Si4B13 amorphous alloy generates abundant α-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(Bs)and slightly worse magnetic softness of the as-spun alloys.The as-spun Fe81.3Si4B7C6Cu1.7 alloy possesses a combined structure of a fully amorphous layer in wheel side surface and predominating nanocrystalline structure with gradually enlarged α-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 Bs of 1.74 T,coercivity(Hc)of 32.7 A/m,effective permeability(μe,at 1 kHz)of 3200 and high relatively strain at fracture(εf)of 3.61％can be achieved directly in this alloy by only using melt-spinning.The annealing at 578 K releases internal stress,promotes the growth of the α-Fe crystals and remains the amorphous layer of the Fe81.3Si4B7C6Cu1.7 alloy,then improves the soft magnetic properties and maintains the superior ductile with increasing the Bs and μe to 1.80 T and 14,100,respectively,lowering the Hc to 9.4 A/m and slightly reducing the εf 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.

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 Devices,Ningbo Institute of Materials Technology&Engineering,Chinese Academy of Sciences,Ningbo 315201,China;Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China;University of Chinese Academy of Sciences,Beijing 100049,China

材料科学技术（英文版）

[1]Xingjie Jia;Bojun Zhang;Wei Zhang;Yaqiang Dong;Jiawei Li;Aina He;Run-Wei Li-.Direct synthesis of Fe-Si-B-C-Cu nanocrystalline alloys with superior soft magnetic properties and ductile by melt-spinning)[J].材料科学技术（英文版）,2022(13):186-195

Fe83,xSi4B13,yCyCux,Fe83Si4B13,Fe81,3Si4B7C6Cu1,entitles

Direct,synthesis,nanocrystalline,alloys,superior,properties,ductile,by,melt,spinning,Structure,spun,were,investigated,addition,amorphous,generates,abundant,crystals,providing,nucleation,sites,further,doping,promotes,growth,suitable,turning,forming,hence,they,increase,saturation,flux,density,Bs,slightly,worse,softness,possesses,combined,structure,fully,layer,wheel,side,surface,predominating,gradually,enlarged,whose,average,size,volume,fraction,are,determined,about,respectively,therefore,high,coercivity,Hc,effective,permeability,kHz,relatively,strain,fracture,can,be,achieved,directly,this,only,using,annealing,releases,internal,stress,remains,then,improves,maintains,increasing,lowering,reducing,combination,simplified,process,great,potentials,performance,electromagnetic,applications

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