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Precipitation of α-Fe from Fe_(84-x)Si_(4)B_(12+x)(x=1,3) Amorphous Alloys Under High Magnetic Field Annealing

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Acta Metallurgica Sinica(English Letters) 2021年第8期34卷 1163-1172页

作者： Leipeng Duan Kang wang engang wang Peng Jia Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China

This work aims to investigate the effects of high magnetic field annealing(HMFA) on the precipitation of α-Fe from Fe_(84-x)Si_(4)B_(12+ x)( x = 1, 3) amorphous precursors. Isothermal annealing process for Fe_(81)Si_(4)B_(15) and Fe_(83)Si_(4)B_(13) amorphous ribbons has been performed with and without the magnetic field. The magnetic field shows the effects of increasing the nucleation rate and decreasing the grain size of α-Fe crystals simultaneously, during the crystallization processes of the investigated amorphous alloys. By applying HMF, α-Fe crystals with more homogeneous distribution and smaller grain size are achieved in the amorphous matrix, which is crucial helpful to improve the magnetic properties for Fe–Si–B amorphous alloys. The mechanism of HMFA affecting the crystallization microstructure is also discussed in the present work.

关键词： High magnetic field Crystallization α-Fe Nucleation Grain size Atomic diffusion

Experimental research on solidification structure of alloy 800H by linear electromagnetic stirring

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China Foundry 2014年第6期11卷 475-480页

作者： Jiang En wang engang Deng Anyuan Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education) Northeastern University

The solidification structures of alloy 800H fabricated with and without linear electromagnetic stirring （L-EMS） were investigated. The results show that the solidification structure of the alloy can be obviously affected by the forced convection in melt caused with L-EMS decreases from 3.5 mm to 2.3 mm, by L-EMS. The average size of equiaxed grains of the alloy and the ratio of equiaxed grain increases from 5% to 43% compared with that without L-EMS. The microstructure of the alloy without L-EMS is composed of fine equiaxed dendrites in the outermost layer and columnar dendrites in other areas, whereas that with L-EMS contains equiaxed dendrites, columnar dendrites and cross dendrites. In addition, the mechanism of dendrite fragment drift was proved by examining the composition change of the main alloying elements in the dendrite trunks at different solidification stage using an electron probe micro-analyzer （EPMA）.

关键词： linear electromagnetic stirring superalloy dendrite fragment solidifi cation

Synthesis of Ag-Cr thin film metallic glasses with enhanced sulfide-resistance

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Journal of Materials Science & Technology 2020年第18期52卷 32-36页

作者： Peng jia Ruiwen Huang Suode Zhang engang wang Jiahao Yao Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyangU0819China School of Metallurgy Northeastern UniversityShenyang110819China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

The thin film glass forming region of the immiscible Ag-Cr binary system was explored by combinatorial *** electrochemical behavior of Ag-Cr alloy films with different Cr content in different corrosive environments containing S^2-or Cl-were investigated in comparison with those of pure *** Ag-Cr thin film metallic glasses(TFMG)exhibit much enhanced corrosion resistance in 0.01 M K2S solution,comparing with that of the bulk silver,the Ag50 Cr50 TFMG exhibits much higher corrosion potential as well as two orders of magnitude lower corrosion current ***,no obvious improvement of the corrosion resistance can be found for the glassy films in 0.1 M NaCl solution.

关键词： Metallic glasses Thin films Silver Corrosion

Influence of high magnetic field on as-cast structure of Cu-25wt.%Ag alloys

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China Foundry 2013年第3期10卷 162-166页

作者： Li Guimao Liu Yan Su Yan wang engang Han Ke Yinfeng Foundry Co. Ltd. Shenyang Machine Tool Group Department of Mechanical Engineering Shenyang Auto Industry College Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University National High Magnetic Field Laboratory

To investigate the influence of high magnetic field (HMF) on the solidification microstructure of Cu-25wt.%Ag alloy, the Cu-25wt.%Ag alloy was prepared under HMF of 12 T, and for comparison, the alloy solidified without HMF was also fabricated. Macro and microstructures of the alloys were observed using the stereomicroscope, and scanning electron microscope, field emission scanning electron microscopy. The weight percentages of the pro-eutectic and eutectic, Cu phase and Ag phase in eutectic, and precipitates of Ag phase in pro-eutectic were analyzed by using of IPP software. Results show that the morphology of the column dendrites changes into cellular dendrites and the grains are refined under HMF of 12 T. Meanwhile, the thickness of the eutectic wall increases, but the sizes of Cu phase and Ag phase and the eutectic lamellar spacings are decreased. The Ag precipitates in the Cu matrix become coarser and sparser. The weight percentage variation of the phases in the microstructure and the Cu-Ag binary phase diagram reveals that the eutectic point moves to the left of the eutectic point in the equilibrium condition and the supersaturated solid solubility of Ag decreases under HMF.

关键词： high magnetic field Cu-25wt.%Ag alloy Cu dendrite eutectic point solid solubility

Preparation and SO2 Adsorption Behavior of Coconut Shell-Based Activated Carbon via Microwave-Assisted Oxidant Activation

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China Petroleum Processing & Petrochemical Technology 2018年第1期20卷 67-74页

作者： Jia Fengrui Li Zhou wang engang He Jicheng Dong Hui Liu Guangxin Jian Weiwei School of Metallurgy Northeastern UniversityShenyang 110819 College of Petroleum Engineering Liaoning Shihua UniversityFushun 113001

A series of oxidants supported on coconut shell-based activated carbon(CAC) through microwave irradiation were prepared and characterized using scanning electron microscopy(SEM), N_2 adsorption/desorption analysis, and X-ray photoelectron spectroscopy(XPS). The SO_2 adsorption capacities and rates were evaluated by adsorption tests performed in a fixed bed reactor with a simulated flue gas, and the adsorption isotherm models were validated against the experimental results. The findings revealed that the SO_2 adsorption capacity decreased in the following order: MW-K_2Cr_2O_7-CAC > MWKMnO_4-CAC > MW-H_2O_2-CAC > MW-CAC. The SO_2 adsorption capacities and adsorption rates of the samples increased with an increasing oxidizability of the oxidants owing to the increment of mean pore size and oxygen-containing functional groups. In addition, a high initial SO_2 concentration and a low bed temperature could positively affect the SO2 adsorption. Finally, the Langmuir model validated that SO_2 was mainly adsorbed through chemical adsorption on the sample surfaces.

关键词： coconut shell-based activated carbon SO2 adsorption microwave oxidant oxygen functional groups

Suppression of discontinuous precipitation and strength improvement by Sc doping in Cu-6 wt%Ag alloys

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Journal of Materials Science & Technology 2023年第4期135卷 80-96页

作者： Bailing An Rongmei Niu Yan Xin William LStarch Zhaolong Xiang Yifeng Su Robert E.Goddard Jun Lu Theo M.Siegrist engang wang Ke Han Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China National High Magnetic Field Laboratory Florida State UniversityTallahasseeFL 32310USA Oak Ridge National Laboratory Oak RidgeTN 37830USA FAMU-FSU College of Engineering TallahasseeFL 32310USA

In low-Ag Cu matrix alloys,the presence of coarse discontinuous precipitates may limit *** demonstrated that discontinuous precipitation was suppressed,and continuous precipitation was en-hanced by the doping of Cu-6 wt%Ag with Sc.A high-volume fraction of continuous precipitates,which nucleated on{111}planes,led to a 55 MPa increase in strength,with only a slight decrease in electri-cal *** addition of Sc inhibited the nucleation of discontinuous precipitates by causing the Sc and the Ag to co-segregate onto grain boundaries,thus forming a thin intermetallic compound layer between *** deformation,both discontinuous and continuous precipitates were drawn into Ag *** combination of deformation strain and doping caused an increase in density and a decrease in the diameter of Ag fibers,resulting in about 205 MPa increase in doped samples when the deformation strain reached *** thinner,denser Ag fibers in the doped samples also caused higher electron scatter-ing at interfaces,leading to electrical conductivity that was 11%IACS lower than in non-doped *** reference,100%IACS(International Annealed Copper Standard)is equivalent to 1.7241μΩcm.

关键词： Sc doping Grain boundary segregation Precipitation Strength Electrical conductivity Plastic deformation

Impacts of High Field Magnetic Fields on Processing of Selected Materials

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Journal of Iron and Steel Research International 2012年第S2期19卷 1054-1057页

作者： HAN Ke ZHANG Lin wang engang ZHOU Xiaoling CUI Baozhi GODDARD Robert WALSH Robert National High Magnetic Field Laboratory Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern University Kunming University of Science and Technology

Various composite conductors and reinforcement materials are used for high field magnets in the USA National High Magnetic Field *** composite conductors are Cu based metal-metal composites,whereas most of reinforcement materials have faced-center-cubic matrix and relatively low ductile-to-brittle transformation temperatures so they can perform at cryogenic *** the operation of the magnets,the mechanical stresses,magnetic fields and other extreme environments are imposed to the materials and materials are 'processed' during the service of the *** instance,the conductors in the magnets are likely to experience higher temperatures than ambient during the operations if the electrical current density for producing high field is sufficiently *** of the conductors are fabricated by cold rolling or drawing that introduces lattice distortions and high densities of interfaces in unit *** temperature and high field exposure of the conductor may affect the characteristics of the lattice distortions and the *** lattice distortion and density of the interface affects the mechanical properties of the conductors,such as the tensile and yield strength,as well as the electric conductivity of the ***,the materials after service are expected to have different properties compared to as-received *** first portion of our paper will focus on relationship between the service and processing of the magnet materials in high field *** high magnetic field can be used directly to process *** some cases,the material properties can be improved by more than 50%if the processing is undertaken in the high magnetic *** improvement is due to the microstructure changes induced by high magnetic *** the behaviors of the materials after they are exposed to high magnetic fields helps us to make good use of the high field processing approach efficiently to fabricate better mater

关键词： high strength materials phase transformation high magnetic fields magnetic materials

Vertical Electromagnetic Brake Technique and Fluid Flow in Continuous Casting Mold

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Vertical Electromagnetic Brake Technique and Fluid Flow in C...

电磁连铸对Incoloy800H合金铸坯内TiN分布和内裂纹的影响

第十届中国钢铁年会暨第六届宝钢学术年会

作者： wang engang Li Zhuang Li Fei Key Laboratory of Electromagnetic Processing of Materials （Ministry of Education）Northeastern University

This paper proposed a new type electromagnetic brake technique that called vertical electromagnetic brake（V-EMBr）, which applied to the slab continuous casting process. A three-dimensional mathematical model is developed to describe molten steel flow and the interfacial behavior of molten steel/liquid slag in the mold with vertical electromagnetic brake, considering the coupled effects of electromagnetic field and flow field. The effect of magnetic flux density, casting speed and the submergence depth of the SEN on flow field in mold with V-EMBr are investigated by numerical simulation method. Meanwhile, the effect of current density on the interfacial behavior of molten steel/liquid slag is also investigated with Volume of fluid（VOF） model. The results show that the application of V-EMBr can play an effect control to the molten steel in the mold, and significantly reduce the flow intensity in upper recirculation zone, decrease the impact strength of jet flow on the narrow face and the flow velocity of molten steel in the free surface of mold. At the same time, the height of molten steel/liquid slag interface can be obviously depressed by V-EMBr with increasing of current density, which is beneficial to reduce the possibility of mold flux entrapment.

关键词： fluid flow V-EMBr continuous casting mold level fluctuation

来源： cnki会议评论

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金属学报 2017年第1期53卷 97-106页

作者：王菲王恩刚贾鹏王韬邓安元东北大学材料电磁过程研究教育部重点实验室沈阳110819

研究开发了Incoloy800H耐腐蚀合金立式电磁连铸制备方法,成功制备出截面为100 mm×100 mm的Incoloy800H连铸坯,并研究了其内部凝固组织、内部裂纹和TiN分布等物理现象。结果表明,常规立式连铸Incoloy800H铸坯的内部组织粗大、存在严重... 详细信息

研究开发了Incoloy800H耐腐蚀合金立式电磁连铸制备方法,成功制备出截面为100 mm×100 mm的Incoloy800H连铸坯,并研究了其内部凝固组织、内部裂纹和TiN分布等物理现象。结果表明,常规立式连铸Incoloy800H铸坯的内部组织粗大、存在严重的内部裂纹和大量TiN夹杂物;采用立式电磁连铸后,制备的Incoloy800H合金连铸坯的中心等轴晶率从2.45%增加至41.45%,且中心等轴晶的平均晶粒尺寸由10.83 mm减小至1.28 mm,并有效地消除了内部裂纹。TiN数量与分布的研究结果表明,立式电磁连铸条件下,铸坯中心的大尺寸TiN(大于2μm)数量由3.71×10^(-4)μm^(-2)降至1.59×10^(-4)μm^(-2),使易于诱发内裂纹的TiN数量显著减少,并抑制了TiN团簇的形成,有助于枝晶间的液态合金的补缩;另一方面,电磁连铸促使Incoloy800H合金连铸坯形成细小的等轴晶,减轻了合金元素偏析并减少了大尺寸TiN的数量,从而减少了萌发裂纹的机率,有效地抑制了内部裂纹的形成。

关键词： Incoloy800H合金电磁场裂纹 TiN