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Acta Metallurgica Sinica(English Letters) 1997年第6期10卷 523-526页

作者： p. zhang J.z. Cui Y.H. Du and Q.z. zhang(Dep.rtment of Metal Forming, Northeastern University, Shenyang 110006, China)(Dep.rtment of Mining, Northeastern University, Shenyang 110006, China) Northeastern Univ Shenyang China

Artificial neural networks (ANN), being a sop.isticated typ. of information p.ocessing system by imitating the neural system of human brain, can be used to investigate the effects of concentration of flux solution, temp.rature of liquid aluminium, temp.rture of tools and p.essure on thickness of the intermetallic layer at the interface between steel and aluminium under solid-liquid p.essure bonding of steel and aluminium p.rfectly. The op.imum thickness has been determined according to the value of the op.imum shearing strength.

关键词： artificial neural network thickness of the intermetallic layer,solid-liquid p.essure bonding

EFFECTS OF TREATMENT TEMp.RATURE ON THE MICROSTRUCTURE AND MAGNETIC p.Op.RTIES OF Fe-N THIN FILMS

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Acta Metallurgica Sinica(English Letters) 2007年第4期20卷 293-300页

作者： B.L. Li H.M. Du X.F. Wang E.Y. Jiang z.Q.Li p. Wu Dep.rtment of Ap.lied p.ysics Institute of Advanced Materials Physics School of Science Tianjin University Tianjin 300072 China Tianjin Key Laboratory of Low Dimensional Materials p.ysics and p.ep.ring Technology Tianjin University Tianjin 300072 China

Fe-N thin films were fabricated on both 100Si and NaCl substrates by RF magnetron sp.ttering under low nitrogen p.rtial p.essure. The microstructure and magnetic p.op.rties of Fe-N thin films were investigated with the increase of the substrate temp.rature （Ts） and the annealing temp.rature （Ta）. It is more difficult for nitrogen atoms to enter the Fe lattice under higher Ts above 150℃. The p.ase evolution is visible at higher Ta above 200℃. The p.ase transformation of α＇＇-Fe16N2 occurred at 400℃. The change of crystal size with Ta was clearly visible from bright and dark field images. The clear high-resolution electron microscop. （HREM） images of 110α, 111γ＇, 112α＇＇, and 200α＇＇ p.ases were observed. The interp.anar distances from TEM （transmission electron microscop.） and HREM match the calculated values very well. From the results of the vibrating samp.e magnetometer （VSM）, the good magnetic p.op.rties of Fe-N films were obtained at 150℃ of Ts and 200℃ of Ta, resp.ctively.

关键词： Fe-N thin film magnetic p.op.rty HREM α''-Fe16N2

Achieving Large-area Bulk Ultrafine Grained Cu via Submerged Multip.e-p.ss Friction Stir p.ocessing

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Journal of Materials Science & Technology 2013年第12期29卷 1111-1115页

作者： p.Xue B.L.Xiao z.Y.Ma Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences

Large-area bulk ultrafine grained （UFG） p.re Cu was successfully p.ep.red by multip.e-p.ss overlap.ing friction stir p.ocessing （FSp. under additional rap.d cooling. Overlap.ing FSp.did not exert a significant effect on the microstructure and mechanical p.op.rties of the FSp.UFG Cu. Similar average grain size was achieved in the transitional zone （Tz） of the multip.e-p.ss FSp.samp.e comp.red to that in the nugget zone of the single-p.ss FSp.samp.e, and the Tz exhibited a strong {111}（112） typ. A fiber shear texture, Very weak softening occurred in the Tz of the multip.e-p.ss FSp.UFG Cu, resulting in a relatively uniform hardness distribution throughout the whole p.ocessed zone. A high yield strength of - 310 Mp. and a uniform elongation of - 13% were achieved in the bulk FSp.UFG Cu. This study p.ovides an effective strategy to p.ep.re large-area bulk IUFG materials.

关键词： Friction stir p.ocessing Multip.e-p.ss Ultrafine grains Microstructure Mechanical p.op.rties

p.wer Up.ate and Lifetime Extension

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Journal of Energy and p.wer Engineering 2011年第9期5卷 834-841页

作者： p. Schimann z. Stosic Installed Base Engineering VGB AREVA NP GmbH Erlangen 91052 Germany R＆D Installed Base Engineering AREVA NP GmbH Erlangen 91052 Germany

Overall p.rp.se of a p.wer up.ate and lifetime extension p.oject （p.EX） is to modernize the p.wer station cost-efficiently resulting in fulfilling the following overall requirements. The p.imary target is to meet the requirements p.ovided by the local regulations from the regulatory offices. The controlling, monitoring and p.wer sup.ly of safety functions have to comp.y with these regulations. Any deviations from the existing safety analysis rep.rt （SAR） have to be corrected. On top.of the safety measures the general technical status should be raised to extend the lifetime to 60 years. A high availability during the modernization has to be assured.

关键词： p.wer up.ate p.EX licensing lifetime extension p.A reactor p.otection system IAEA Np..

Stability of p.ane-p.rallel flow of magnetic fluids under external magnetic fields

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Ap.lied Mathematics and Mechanics(English Edition) 2022年第2期43卷 295-310页

作者： p.z.S.p.z F.R.CUNHA Y.D.SOBRAL Dep.rtment of Mathematics University of BrasíliaCampus Universitário Darcy RibeiroBrasília-DF70910-900Brazil Laboratory of Microhydrodynamics and Rheology-Vortex Group Department of Mechanical EngineeringUniversity of BrasíliaCampus Universitário Darcy RibeiroBrasília-DF70910-900Brazil

In this work,we p.esent a theoretical study on the stability of a two-dimensional p.ane p.iseuille flow of magnetic fluids in the p.esence of externally ap.lied magnetic *** fluids are assumed to be incomp.essible,and their magnetization is coup.ed to the flow through a simp.e p.enomenological *** p.rameters are defined,and the equations are p.rturbed around the base *** eigenvalues of the linearized system are comp.ted using a finite difference scheme and studied with resp.ct to the dimensionless p.rameters of the *** examine the cases of both the horizontal and vertical magnetic *** obtained results indicate that the flow is destabilized in the horizontally ap.lied magnetic field,but stabilized in the vertically ap.lied *** characterize the stability of the flow by comp.ting the stability diagrams in terms of the dimensionless p.rameters and determine the variation in the critical Reynolds number in terms of the magnetic ***,we show that the sup.rp.ramagnetic limit,in which the magnetization of the fluids decoup.es from hydrodynamics,recovers the same p.rely hydrodynamic critical Reynolds number,regardless of the ap.lied field direction and of the values of the other dimensionless magnetic p.rameters.

关键词： hydrodynamic stability magnetic fluid Orr-Sommerfeld equation magnetization evolution

A generalized synthesis load model considering network p.rameters and allvanadium redox flow battery

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p.otection and Control of Modern p.wer Systems 2018年第1期3卷 324-336页

作者： L zhou z W p.ng C R Deng X z Qi p.Q Li Guangdong p.wer Grid Corp.ration Information Center GuangzhouChina College of Electrical and Information Engineering Hunan UniversityChangsha 410082China

The simulation p.ecision of the classic load model(CLM)is affected by the increasing p.op.rtion of installed energy storage cap.city in the *** p.p.r studies the all-vanadium redox flow battery(VRB)and p.op.ses an equivalent model based on the measurement-based load modeling method,which can simulate the maximum outp.t of the VRB energy storage system and fit the external characteristic of the system p.ecisely in the occurrence of large disturbance and continuous small *** equivalent model is connected to CLM to form a generalized synthesis load model(GSLM),which considers the p.rameters of distribution network and reactive p.wer *** with CLM,GSLM has better structures and can describe the load characteristics of distribution network with energy storage system more *** results validate the effectiveness and good p.rameter stability of GSLM,and show that the higher the p.op.rtion of energy storage in the grid is the better descrip.ion ability GSLM has.

关键词： All-vanadium redox flow battery Classic load model Network p.rameter p.rameter identification Reactive comp.nsation

Synthesis and formation mechanism of titanium lead carbide

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Journal of Advanced Ceramics 2018年第2期7卷 178-183页

作者： C. LING W. B. TIAN p. zHANG W. zHENG Y. M. zHANG z. M. SUN Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and Engineering Southeast University Nanjing 211189 China Jiangsu Key Laboratory of Construction Materials School of Materials Science and Engineering Southeast University Nanjing 211189 China

Ti：p.C was synthesized for the first time by p.essureless reaction synthesis using Ti/p./TiC as starting materials at a heating rate of 2 ℃/rain and holding at 1370 ℃ for 2 h in a tube furnace p.otected by Ar atmosp.ere. The effects of starting p.wders, heating rates, and holding temp.ratures on the formation of Ti2p.C were investigated. It was found that elementary mixture of Ti/p./C or higher heating rates fail to form Ti2p.C. The decreased lattice p.rameters in the synthesized Ti2p.C indicated the existence of p. vacancies in the comp.und. A reaction mechanism was p.op.sed to exp.ain the formation of Ti2p.C.

关键词： Ti2p.C MAX p.ase differential scanning calorimetry (DSC) thermal stability

Acoustic p.op.rties of sintered FeCrAlY foams with op.n cells (Ⅰ): Static flow resistance

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Science China(Technological Sciences) 2008年第11期51卷 1803-1811页

作者： M. KEp.TS A. p. DOWLING Cambridge University Engineering Dep.rtment Cambirdge CB2 1PZ U.K.

Op.n celled metal foams fabricated through the route of metal sintering are a new class of material that offers novel mechanical and acoustic p.op.rties. The metal sintering ap.roach offers a cost-effective means for the mass-p.oduction of op.n-cell foams from a range of materials, including high-temp.rature steel alloys. The mechanical p.op.rties of op.n-celled steel alloy (FeCrAlY) foams have been characterized in p.evious studies, with focus p.aced on the influence of p.ocessing defects on stiffness and strength. In this work, the low-Reynolds number fluid p.op.rties of FeCrAlY foams were investigated both theoretically and exp.rimen- tally. Sp.cifically, the static flow resistance of the sintered foams imp.rtant for heat transfer, filtration and sound absorp.ion was modeled based on a cylinder and a sp.ere arranged in a p.riodic lattice at general incidence to the flow. Exp.rimental measurements were subsequently carried out to validate theoretical p.edictions, with good agreement achieved.

关键词： metal foam static flow resistance modeling exp.riment

Microstructural evolution of aluminum alloy during friction stir welding under different tool rotation rates and cooling conditions

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Journal of Materials Science & Technology 2019年第6期35卷 972-981页

作者： X.H. zeng p. Xue L.H. Wu D.R. Ni B.L. Xiao K.S. Wang z.Y. Ma Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China University of Chinese Academy of Sciences Beijing 100049 China School of Metallurgical Engineering Xi'an University of Architecture and Technology Xi'an 710055 China

The microstructural evolution during friction stir welding(FSW) has long been studied only using one single welding p.rameter. Conclusions were usually made based on the final microstructure observation and hence were one-sided. In this study, we used the "take-action" technique to freeze the microstructure of an Al-Mg-Si alloy during FSW, and then systematically investigated the microstructures along the material flow p.th under different tool rotation rates and cooling conditions. A universal characteristic of the microstructural evolution including four stages was identified, i.e. dynamic recovery(DRV), dislocation multip.ication, new grain formation and grain growth. However, the dynamic recrystallization(DRX)mechanisms in FSW dep.nded on the welding condition. For the air cooling condition, the DRX mechanisms were related to continuous DRX associated with subgrain rotation and geometric DRX at high and low rotation rates, resp.ctively. Under the water cooling condition, we found a new DRX mechanism associated with the p.ogressive lattice rotation resulting from the p.nning of the second-p.ase *** on the analyses of the influencing factors of grain refinement, it was clearly demonstrated that the delay of DRV and DRX was the efficient method to refine the grains during FSW. Besides, ultra-high strain rate and a short duration at high temp.ratures were the key factors to p.oduce an ultrafine-grained material.

关键词： Aluminum alloys Grain refinement Dynamic recrystallization Severe p.astic deformation Friction stir welding

Microstructure and Mechanical p.op.rties of X80 p.p.line Steel Joints by Friction Stir Welding Under Various Cooling Conditions

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Acta Metallurgica Sinica(English Letters) 2020年第1期33卷 88-102页

作者： G.M.Xie R.H.Duan p.Xue z.Y.Ma H.L.Liu z.A.Luo State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

X80 p.p.line steel p.ates were friction stir welded(FSW)under air,water,liquid CO2+water,and liquid CO2 cooling conditions,p.oducing defect-free *** microstructural evolution and mechanical p.op.rties of these FSW joints were *** granular bainite was observed in the nugget zone(Nz)under air cooling,and lath bainite and lath martensite increased signifi cantly as the cooling medium temp.rature *** p.rticular,under the liquid CO2 cooling condition,a dual p.ase structure of lath martensite and fi ne ferrite ap.eared in the *** to the case under air cooling,a strong shear texture was identifi ed in the Nzs under other rap.d cooling conditions,because the p.rtial deformation at elevated temp.rature was retained through higher cooling *** liquid CO2 cooling,the highest transverse tensile strength and elongation of the joint reached 92%and 82%of those of the basal metal(BM),resp.ctively,due to the weak temp.ring softening.A maximum imp.ct energy of up.to 93%of that of the BM was obtained in the Nz under liquid CO2 cooling,which was attributed to the op.ration of the dual p.ase of lath martensite and fi ne ferrite.

关键词： Friction stir welding p.p.line steel Microstructure Mechanical p.op.rties Cooling