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Dynamic-decision-based Real-time Dispatch for Reducing constraint Violations

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Journal of Modern Power Systems and clean Energy 2022年第4期10卷 829-838页

作者： Lingshu Zhong Junbo Zhang c.y.chung yuzhong Gong Lin Guan School of Electrical Power South China University of TechnologyGuangzhou 510640China Department of Electrical and computer Engineering University of SaskatchewanSaskatoon S7N5A9Canada

This paper proposes a dynamic-decision-based realtime dispatch method to coordinate the economic objective with multiple types of security dispatch objectives while reducing constraint violations in the process of adjusting the system operation point to the *** each decision moment,the following tasks are executed in turn:①locally linearizing the system model at the current operation point with the online model identification by using measurements;②narrowing down the gaps between unsatisfied security requirements and their security thresholds in order of priority;③minimizing the generation cost;④minimizing the security indicators within their security *** with the existing real-time dispatch strategies,the proposed method can adjust the deviations caused by unpredictable power flow fluctuations,avoid dispatch bias caused by model parameter errors,and reduce the constraint violations in the dispatch decision *** effectiveness of the proposed method is verified with the IEEE 39-bus system.

关键词： Dynamic decision real-time dispatch securityconstrained dispatch N-1 security small-signal stability datadriven optimization

Static spheroidization and its effect on superplasticity of fine lamellae in nugget of a friction stir welded Ti-6Al-4V joint

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Journal of Materials Science & Technology 2022年第24期119卷 1-10页

作者： c.L.Jia L.H.Wu P.Xue H.Zhang D.R.Ni b.L.Xiao Z.y.Ma Shi-changxu Innovation center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The spheroidization of the lamellar structure can greatly contribute to the superplasticity of the nugget zone(NZ)of Ti alloy welds,which is the key to achieve the integral superplastic forming of welds for the fabrication of large-scale complex ***,the spheroidization process is complex and costly since it cannot be obtained generally,unless the lamellae suffers from a large *** this study,the static spheroidization was achieved for the fine lamellae structure in the nugget of a friction stir welded(FSW)Ti-6Al-4V joint,particularly by the annealing without any *** specialα/βinterface obeying a burgers orientation relationship(bOR)after FSW was first time directly observed,whose effect on the spheroidization was discussed.A new static spheroidization mechanism with the gradual coalescence of the adjacent lamellae was discovered,which we named as“termination coalescence”.There was a slower coarsening rate in the lamellar structure than in the classical equiaxed one,due to the bOR in the lamellae,although both of them exhibited a volume diffusion character during ***,the similar superplasticity can be achieved for the base material and NZ after *** study can provide a new way to the spheroidization and a theoretical basis for the integral superplastic forming of welds during production.

关键词： Friction stir welding Titanium alloys Spheroidization mechanism coalescence Superplasticity Static annealing

γ"variant-sensitive deformation behaviour of Inconel 718 superalloy

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Journal of Materials Science & Technology 2022年第31期126卷 169-181页

作者： R.y.Zhang H.L.Qin Z.N.bi y.T.Tang J.Araújo de Oliveira T.L.Lee c.Panwisawas S.y.Zhang J.Zhang J.Li H.b.Dong centre of Excellence for Advanced Materials Dongguan 523808China School of Engineering University of LeicesterUniversity RoadLeicester LE17RHUnited Kingdom beijing Key Laboratory of Advanced High Temperature Materials Central Iron and Steel Research InstituteBeijing 100081China Department of Materials University of OxfordParks RoadOxford OX13PHUnited Kingdom StressMap Engineering and Innovation DepartmentThe Open UniversityWalton HallMilton Keynes MK76AAUnited Kingdom ISIS Neutron Source Rutherford Appleton LaboratoryHarwell Science and Innovation CampusChiltonOxfordshire OX110QXUnited Kingdom School of Material Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Strengthening in Inconel 718 superalloy is derived from dislocation interaction withγ"precipitates,which exist in disk-shaped three possible orientation variants with their{100}habit plane normal to each *** interactions between dislocations andγ"precipitates vary according to theγ"orienta-tion variants,which makes the deformation behaviour complicated and difficult to reveal *** this work,γ"variant distributions of Inconel 718 samples were tailored by ageing heat treatment under either tensile or compressive ***γ"variant-sensitive deformation behaviours were then studied by in situ tensile tests via neutron diffraction at room *** is demonstrated that yield-ing first takes place in grains oriented withparallel to the loading *** identical lattice strain response to applied stress of both theγmatrix and theγ"precipitates was observed during yield-ing,suggesting that dislocations shearing through theγ"precipitates is predominant at this ***-ations in yield strength for samples with differentγ"variant distributions were observed,which can be attributed to different strengthening that arises from interactions between dislocation and differentγ"variants.

关键词： Ni-base superalloys Precipitation strengthening Neutron diffraction Lattice strains Plastic deformation

Further investigation on the fusion of ^(6)Li with ^(209)bi target at near-barrier energies

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chinese Physics c 2024年第7期48卷 106-117页

作者：张高龙焦振威张广鑫 M.R.cortes 胡世鹏钱建强 D.Mengoni 屈卫卫李聪博郑云张焕乔孙慧斌王楠张春雷 J.J.Valiente-Dobón D.Testov M.Mazzocco A.Gozzelino c.Parascandolo D.Pierroutsakou M.La commara A.Goasduff D.bazzacco D.R.Napoli F.Galtarossa F.Recchia A.Illana S.bakes I.Zanon S.Aydin G.de Angelis M.Siciliano R.Menegazzo S.M.Lenzi J.L.Ferreira J.Rangel Serkan Akkoyun L.F.canto J.Lubian School of Physics Beihang UniversityBeijing 100191China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China Instituto de Física Universidade Federal Fluminense24210-340NiteróiRio de JaneiroBrazil Institute for Advanced Study in Nuclear Energy&Safety Shenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Research and Manufacture of High Purity Germanium Materials and Fetectors Shenzhen UniversityShenzhen 518060China INFN Sezione di PadovaPadovaItaly Dipartimento di fisica Astronomia dell'Universita di padova PadovaItaly State Key Laboratory of Radiation Medicine and Protection School of Radiation Medicine and ProtectionSoochow UniversitySuzhou 215123China china Institute of Atomic Energy Beijing 102413China The Key Laboratory of beam Technology and Material Modification of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China INFN Laboratori Nazionali di LegnaroI-35020 LegnaroItaly INFN Sezione di NapoliI-80126 NapoliItaly Dipartimento di Farmacia Universitàdi Napoli"Federico II"I-80131 NapoliItaly Department of Natural and Mathematical Sciences Faculty of EngineeringTarsus University33480 MersinTurkiye Physics Division Argonne National LaboratoryLemont-ILUSA Departamento de Matemaética Física e Computaç˜ao Universidade do Estado do Rio de JaneiroFaculdade de Tecnologia27537-000ResendeRio de JaneiroBrazil Department of Physics Sivas Cumhuriyet UniversitySivasTurkey Instituto de Física Universidade Federal do Rio de JaneiroCP 6852821941-972Rio de JaneiroBrazil

The complete and incomplete fusion cross sections for ^(6)Li+^(209)bi were measured using the in-beamγ-ray method around the coulomb *** cross sections of(deuteron captured)incomplete fusion(IcF)products were re-quantified experimentally for this reaction *** results reveal that the IcF cross section is equivalent to that of complete fusion(cF)above the coulomb barrier and dominant near or below the coulomb barrier.A theoretical calculation based on the continuum discretized coupled channel(cDcc)method was performed for the aforementioned cF and IcF cross sections;the result is consistent with the *** universal fusion function(UFF)was also compared with the measured cF cross section for different barrier parameters,demonstrating that the cF suppression factor is significantly influenced by the choice of potential,which can reflect both dynamic and static effects of breakup on the fusion process.

关键词： cross section incomplete fusion suppression factor weakly bound nuclei

Microstructure and Mechanical Property of Hot-Rolled Mg-2Ag Alloy Prepared with Multi-pass Rolling

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Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 335-342页

作者： H.Zhang H.L.Hao G.y.Fu b.S.Liu R.G.Li R.Z.Wu H.c.Pan School of Mechanical and Power Engineering Shenyang University of Chemical TechnologyShenyang110142China Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin150001China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) Northeastern UniversityShenyang110819China

A conventional multi-pass rolling is designed to form different microstructures in a Mg-2Ag *** relationship between microstructure and mechanical property is *** result shows that twin-induced nucleation plays a prominent role for the dynamic recrystallization(DRX)behavior of the rolled Mg-2Ag *** DRXed grains distributed around elongated grains have random orientations but gradually turn to the concentrated orientation with strong basal texture when the rolling pass *** yield strength and ultimate tensile strength of rolled Mg-2Ag alloy gradually increase with increasing rolling *** elongation of rolled sample is gradually improved when the rolling pass increases from one to three,while a significant drop of elongation shows in the four-pass rolling *** strong basal texture,refined grains,high-density dislocations,and Ag segregation along grain boundaries are suggested to play a prominent role for enhancing the strength of Mg-Ag alloys,while the low-density dislocations,homogeneously fine-grained microstructure,and weak texture are critical for improving the ductility.

关键词： Magnesium alloy conventional rolling Twinning Dynamic recrystallization Texture

Accelerated protons with energies up to 70 MeV based on the optimized SG-Ⅱ Peta-watt laser facility

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High Power Laser Science and Engineering 2023年第5期11卷 127-136页

作者： H.H.An W.Wang J.Xiong c.Wang X.Pan X.P.Ouyang S.Jiang Z.y.Xie P.P.Wang y.L.yao N.Hua y.Wang Z.c.Jiang Q.Xiao F.c.Ding y.T.Wan X.Liu R.R.Wang Z.H.Fang P.Q.yang y.E.Jiang P.Z.Zhang b.Q.Zhu J.R.Sun b.Qiao A.L.Lei J.Q.Zhu Shanghai Institute of Laser Plasma China Academy of Engineering PhysicsShanghaiChina Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghaiChina center for Applied Physics and Technology Peking UniversityBeijingChina National Laboratory on High Power Laser and Physics ShanghaiChina

The target backsheath field acceleration mechanism is one of the main mechanisms of laser-driven proton acceleration(LDPA)and strongly depends on the comprehensive performance of the ultrashort ultra-intense lasers used as the driving *** successful use of the SG-II Peta-watt(SG-II PW)laser facility for LDPA and its applications in radiographic diagnoses have been manifested by the good performance of the SG-II PW ***,the SG-II PW laser facility has undergone extensive maintenance and a comprehensive technical upgrade in terms of the seed source,laser contrast and terminal *** experiments were performed using the maintained SG-II PW laser beam,and the highest cutoff energy of the proton beam was obviously ***,a double-film target structure was used,and the maximum cutoff energy of the proton beam was up to 70 *** results demonstrate that the comprehensive performance of the SG-II PW laser facility was improved significantly.

关键词： laser-driven proton acceleration SG-II Peta-watt laser target normal sheath acceleration

Mechanistic investigation on ce addition in tuning recrystallization behavior and mechanical property of Mg alloy

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Journal of Materials Science & Technology 2023年第1期132卷 1-17页

作者： J.R.Li D.S.Xie Z.R.Zeng b.Song H.b.Xie R.S.Pei H.c.Pan y.P.Ren G.W.Qin Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) College of Materials Science and EngineeringNortheastern UniversityShenyang110819China college of Engineering and computer Science Australian National UniversityACT 2601Australia School of Materials and Energy Southwest UniversityChongqing 400715China Institute for Physical Metallurgy and Materials Physics RWTH Aachen UniversityAachen 52062Germany

constructing bimodal grain structure is a promising approach to achieve the high strength-ductility syn-ergy in Mg *** of bimodal grain is closely related to the dynamic and/or static recrystal-lization process,which has not been fully understood in the typical Mg-RE based *** this work,it is claimed for the first time that the minor ce addition(∼0.3 wt%)into Mg matrix significantly pro-motes the pyramidalc+a>and non-basaldislocations at the early stage of extrusion,which con-sequently enhances the formation of sub-grain boundaries via the movement and recovery of pyramidal II-typec+a>*** this stage,fine sub-grain lamellae are widely observed predominantly due to the low migration rate of sub-grain boundary caused by the limited mobility ofc+a>*** the later stage,the sub-grains continuously transform into dynamic recrystallized(DRXed)grains that have10¯10Taylor axis and also strong fiber texture,indicating substantial activation of pyramidal II-typec+a>*** low mobility ofc+a>dislocations,accompanied with the solute drag from grain boundary(Gb)segregation and pinning from nano-phases,cause a sluggish DRX process and thus a bimodal microstructure with ultra-fined DRXed grains,∼0.51μ*** resultant texture hardening and grain refinement hardening effects,originated from bimodal microstructure,result in a yield strength of∼352 MPa,which is exceptional in Mg-ce dilute *** work clarifies the critical role of ce addition in tuning recrystallization behavior and mechanical property of magnesium,and can also shed light on designing the other high-performance Mg alloys.

关键词： Mg alloys Recrystallization behavior Mechanical property Pyramidal dislocation Thermal stability

Role of grain boundary character on bi segregation-induced embrittlement in ultrahigh-purity copper

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Journal of Materials Science & Technology 2023年第28期159卷 52-61页

作者： y.X.Hua K.X.Song H.T.Liu J.W.Wang c.M.Zhang y.J.Zhou b.Pang J.T.Song J.L.He H.L.Zhao School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China Henan Academy of Sciences Zhengzhou 450000China Henan Key Laboratory of Advanced conductor Materials Zhengzhou 450046China Provincial and Ministerial co-construction of collaborative Innovation center of Nonferrous New Materials and Advanced Processing Technology Luoyang 471023China center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China college of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

bismuth(bi),as an impurity element in copper and copper-based alloys,usually has a strong tendency of grain boundary(Gb)segregation,which depends on the Gb ***,the influence of such a segregation on the properties of ultrahigh-purity copper has been rarely reported and the exact structural arrangements of bi atoms at different Gbs remain largely *** this study,we investigated the influ-ence of trace amounts of bi(50-300 wt ppm)on the ductility of an ultrahigh-purity copper(99.99999%)in the range of room temperature to 900°*** tensile results show that the addition of bi seriously damages the ductility of the ultrahigh-purity copper at temperatures of 450-900°c,which is due to the Gb segregation of *** this basis,such a segregation behavior at different types of Gbs,including high and low angle Gbs(HAGbs/LAGbs),and twin boundaries(Tbs),via the scanning electron microscope-electron backscattered diffraction(SEM-EbSD)and aberration-corrected scanning transmission electron microscope(Ac-STEM)investigations,combined with the first-principles calculations were systematically *** atomistic characterizations demonstrate an anisotropic bi segregation,where severe enrich-ment of bi atoms typically occurs at the HAGbs,while the absence of bi adsorption prevails at LAGbs or *** particular,the segregated bi at random HAGbs exhibited the directional bilayer adsorption,while the special symmetrical7 HAGb presented a unique bi-rich cluster *** findings pro-vide a comprehensive experimental and computational understanding on the atomic-scale segregation of impurities in metallic materials.

关键词： Grain boundary character Embrittlement bi segregation Atomic configuration Ultrahigh-purity copper

Point process microstructural model of metallic thin films with implications for coarsening

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npj computational Materials 2023年第1期9卷 2074-2082页

作者： J.M.Rickman K.barmak y.Epshteyn c.Liu Department of Materials Science and Engineering Lehigh UniversityBethlehemPA 18015USA Department of Physics Lehigh UniversityBethlehemPA 18015USA Department of Applied Physics and Applied Mathematics Columbia UniversityNew YorkNY 10027USA Department of Mathematics The University of UtahSalt Lake CityUT 84112USA Department of Applied Mathematics Illinois Institute of TechnologyChicagoIL 60616USA

We develop a thin-film microstructural model that represents structural markers(i.e.,triple junctions in the two-dimensional projections of the structure of films with columnar grains)in terms of a stochastic,marked point process and the microstructure itself in terms of a grain-boundary *** advantage of this representation is that it is conveniently applicable to the characterization of microstructures obtained from crystal orientation mapping,leading to a picture of an ensemble of interacting triple junctions,while providing results that inform grain-growth models with experimental *** specifically,calculated quantities such as pair,partial pair and mark correlation functions,along with the microstructural mutual information(entropy),highlight effective triple junction interactions that dictate microstructural *** validate this approach,we characterize microstructures from Al thin films via crystal orientation mapping and formulate an approach,akin to classical density functional theory,to describe grain growth that embodies triple-junction interactions.

关键词： grain microstructure process