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Oxidation behavior and microstructural evolution of FeCoNiTiCu five-element high-entropy alloy nanoparticles

Journal of Materials Science & Technology 2024年第10期177卷 133-141页

作者： H.Bai R.Su R.Z.Zhao C.L.Hu L.Z.Ji y.J.liao y.N.Zhang y.x.li x.F.Zhang Key Laboratory for Anisotropy and Texture of Materials(MOE) School of Materials Science and EngineeringNortheastern UniversityShenyang110819China Institute of Advanced Magnetic Materials College of Materials and Environmental EngineeringHangzhou Dianzi UniversityHangzhou310012China

High-entropy alloys(HEAs)have attracted extensive attention ascribed to their unique physical and chemical properties induced by the cocktail ***,their oxidation behaviors,in particular at nanoscale,are still lack because of multi-element complexity,which could also be completely differ-ent from the bulk *** this work,we synthesized FeCoNiTiCu five-element HEA nanopar-ticles(NPs)with uniform elemental distribution by arc-discharging approach,and further investigated their oxidation behaviors at 250 ℃,and 350 ℃.The morphology,structure and element distribution of NPs were analyzed by transmission electron microscopy(TEM),energy dispersive spectroscopy(EDS)and electron energy loss spectroscopy(EELS).The surface oxidation in FeCoNiTiCu NPs during the high-temperature process can induce nanoscale pores at core/shell interfaces by Kirkendall effect,and even the eventual coalescence into a single ***,the oxidation states of NPs with diameters(d)varying from 60 to 350 nm were analyzed in detail,revealing two typical configurations:hollow(dyolk-shell structures(d>150 nm).The experimental results were complemented by first-principles calculations to investigate the diffusion behaviors of five elements,evidencing that the surface oxidation strongly alters the surface segregation preferences:(1)in the initial stage,Cu and Ni appear to prefer segregating on the surface,while Co,Ti and Fe tend to stay in the bulk;(2)in the oxidation process,Cu prefers to stay in the center,while Ti segregates to the surface ascribed to the reduced po-tential *** study gives new insights into oxidation of nanoscale HEA,and also provides a way for fabrication of high-entropy oxides with controllable architectures.

关键词： High-entropy alloy Nanoparticles Oxidation Kirkendall effect Exchange bias effect

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Modularity Techniques in High Performance Permanent Magnet Machines and Applications

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CES Transactions on Electrical Machines and Systems 2018年第1期2卷 93-103页

作者： Z.Q.Zhu y.x.li University of Sheffield UK

This paper reviews the modularity techniques in the stator manufacture of permanent magnet machines for different *** basic concepts of modular machines are firstly *** machines for several typical applications are then described in details,including domestic appliances,automobiles and electric vehicles,more electric aircrafts and civic applications,wind power generators,***,the influence of manufacture tolerance gaps and flux barriers on the electromagnetic performance is discussed.

关键词： Domestic appliance electric vehicle(EV) modular machine more electric aircraft permanent magnet wind power generator

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Development of thermal simulation system for heavy section ductile iron solidification

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China Foundry 2004年第S1期1卷 25-28页

作者： Z.H.li H.y.Geng y.x.li Department of Mechanical Engineering Tsinghua UniversityBeijing 100084P.R.China

A new reliable thermal simulation system for studying solidification of heavy section ductile iron has been developed using computer feedback control and artificial intelligent methods. Results of idle test indicate that the temperature in the system responses exactly to the inputted control data and the temperature control error is less than ±0.5%. It is convenient to simulate solidification of heavy section ductile iron using this new system. Results of thermal simulation experiments show that the differences in nodularity and number of graphite nodule per unit area in the thermal simulation specimen and the actual heavy section block is less than 5% and 10%, respectively.

关键词： solidification thermal simulation heavy section ductile iron

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Zinc in animal feeds and manures from farms of different scales in Northeast China

Zinc in animal feeds and manures from farms of different sca...

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Environmental Pollution and Public Health(EPPH 2012)

作者： F S.Zhang y.x.li M.yang State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal University

To determine the content of Zn, 104 livestock feeds and 118 animal manure samples from farms of different herd size in the northeast of China were collected and analyzed. In terms of the large, middle and small farms, the contents of Zn ranged from 37.37-206.72 mg/kg, 38.92-128.12 mg/kg and 57.27-598.32 mg/kg in pig feeds, 74.07-150.97 mg Zn/kg, 63.12-127.32 mg Zn/kg and 52.62-111.12 mg Zn/kg in chicken feeds, and their content in cattle feeds were similar to that in chicken feeds. The typical content in pig manures was 691.56 mg Zn/kg, 475.99 mg/kg, and 674.74 mg Zn/kg in large, middle and small farms, which reflecting Zn contents in the feeds. Typical contents in poultry manures were 384.15 mg Zn/kg, 241.74 mg Zn/kg and 268.16 mg Zn/kg in poultry manures, and 136.13 mg Zn/kg, 126.33 mg Zn/kg and 119.12 mg Zn/kg in cattle manures. About 12442.7t/year of Zn was input to farmland through application of animal manure in the northeast of China, animal manure was an important source of Zn to the environment of Northeast China.

关键词： Zn livestock feeds animal manures Northeast China

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Electronic structure and photocatalytic properties of copper-doped CaTiO3

Electronic structure and photocatalytic properties of copper...

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第九届全国氢能学术会议

作者： H.J.Zhang,G.Chen,y.x.li,y.J.Teng Harbin Institute of Technology,China

Doping foreign elements into a semiconductor with wide band gap to create a new donor or acceptor level in the forbidden band is known to be one of the methods for developing visible-light driven *** this paper,the effects of divalent metal copper ion doping on the photocatalytic activity of CaTiO powder for overall water splitting were

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Band structure and photocatalytic activities for H2 production of ABi2Nb2O9(A=Ca,Sr,Ba)

Band structure and photocatalytic activities for H2 producti...

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第九届全国氢能学术会议

作者： y.x.li,G Chen,H.J.Zhang,Z.S Lv Harbin Institute of Technology,China

Layered metal oxides have been demonstrated to be highly active photocatalysts under light *** was explained that these layered materials use their interlayer space as reaction sites,where electron-hole recombination process could be retarded by physical separation of electron and hole pairs generated by *** this paper,a new series of layered perovskite photocatalysts,ABiNbO(A=Ca,Sr,Ba),were synthesized by the

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Analysis of Influence of Environmental conditions on Ganoderic Acid Content in Ganoderma lucidum Using Orthogonal Design

Analysis of Influence of Environmental conditions on Ganoder...

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第八届海峡两岸菌物学学术研讨会

作者： li N.,x.H.liu,J.Zhou,y.x.li,M.W.Zhao~* (Microbiology Department,Nanjing Agricultural University,Key Lab of Microbiological Engineering of Agricultural Environment,Ministry of Agriculture,Nanjing 210095,P.R.China)

The influence of environmental conditions on the ganoderic acid(GA) content in the fungus Ganoderma lucidum was investigated using a one-factor-at-a-time design and orthogonal *** the various medium constituents examined,sucrose,soybean powder or peptone,ferrous sulfate and pH 6.0 were the most suitable carbon source(A),nitrogen source(B),mineral source(C) and initial pH(D),respectively,for the GA content in the one-factor-at-a-time *** to the orthogonal design,the order of effect for the four factors on the GA content was A>C>D>*** best level of factor A was A(sucrose) with a value of +0.34 mg/100mg DW. The optimal treatment combination was ABCD with which the GA content reached up to 2.63±0.011 mg/100 mg *** interactions between the mineral ion and the nitrogen source,and the mineral ion and the pH were both highly significant(Py help to understand the metabolic pathway leading to tnterpene biosynthesis and the expression and regulation of the key enzymes involved.

关键词： Ganoderma lucidum ganoderic acid content orthogonal design statistical analysis

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肌萎缩侧索硬化症病人动作过程中皮质激活的改变:单参数功能性MRI研究

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国际医学放射学杂志 2015年第6期 594-595页

作者： H.Q.li y.Chen y.x.li B.yin W.J.Tang x.R.yu 冀晓东 Department of Radiology Fudan UniversityHuashan Hospital

摘要目的利用功能性MRI(f MRI)研究肌萎缩性脊髓侧索硬化症(ALS)病人运动监视中的脑功能异常。方法对30例ALS病人和30名健康对照者进行f MRI的实验,同时观察

关键词：病人功能性皮质 MRI

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THE EFFECT STRESS ON THE MAGNETOSTRICTION IN TWIN- FREE SINGLE CRySTALS Tb_y Dy_(1-y) (Fe_(1-x) T_x)_2 (T=Al,Mn)

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Acta Metallurgica Sinica(English Letters) 1999年第5期12卷 874-876页

作者： y.x.li, G.Z.xu,J.P.Qu, F.G.liu and B.W. Wang Hebei University of Technology, Tianjin 300130, China C. Zhao Tianjin University, Tianjin 300072, China S.x. Gao Hebei Normal University,Shijiazhuang 050091, China C.C. Tang, G.H.Wu, J.H.Wang, J.Du and W

Magnetostriction at room temperature under various conditions of compressive prestress and applied fields in Tb yDy 1-y (Fe 1-x T x) 2 (T=Al,Mn) twin-free single crystals were investigated. The substitution of Al or Mn for Fe lowers the magnetostriction un-der ordinary temperature and pressure, but it also decreases the saturation field, which enables these materials with potential benefits for applications.

关键词： magnetostriction Terfenol-D single crystal

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THE SyNTHESIS AND MAGNETOSTRICTION OF P_ (rx) Ce_(1-x) Fe_2 COMPOUNDS

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Acta Metallurgica Sinica(English Letters) 1999年第5期12卷 877-879页

作者： y.x.li,G.Z.xu,J.P.Qu,F.G.liu and B.W.Wang Hebei University of Technology, Tianjin 300130,China C.C.Tang.G.H.Wu and W.S.Zhan State Key Laboratory for Magnetism, Institute of Physics,CAS, Beijing 100080,China C.Zhao Tianjin University, Tianjin 300072,C

The synthesis and magnetic properties of Pr xCe 1 x Fe 2 have been investigated. The forma tion of Pr xCe 1 x Fe 2 is found to depend strongly on annealing temperature. Pure single phase compound can be synthesized at ambient pressure when x≤0 5. The main phase of the Laves structure can still be observed up to x=0 8. Magnetostriction increases with in creasing x and a largest saturation magnetostriction 200 ppm is observed for x=0.5.

关键词： magnetostriction rare earth iron Laves phase

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