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Nanomechanics of Mg-gd-Y-Nd-Zn alloy with LPSO and MgRE phases

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journal of Magnesium and Alloys 2024年第8期12卷 3370-3393页

作者： h.Vafaeenezhad S.Aliakbari-Sani A.Kalaki g.R.Ebrahimi j.hirsch Department of Materials Science and Engineering Engineering FacultyFerdowsi University of MashhadAzadi SquareMashhadIran Department of Materials Engineering Hakim Sabzevari UniversitySabzevarIran Department of Materials and Metallurgical Engineering Amirkabir University of Technology(Tehran Polytechnic)Hafez Ave.TehranIran Department of Metals Technology and Aviation Materials Samara National Research UniversityMoskovskoye Shosse 34443086 SamaraRussia Research and Development Hydro Aluminium Rolled Products GmbHD-53117 BonnGermany

The mechanical properties of two main precipitating phases(LPSO and MgRE)and matrix in Mg-gd-Y-Nd-Zn bioalloy were examined using nanoindentation method.A new is suggested for characterizing the elastic-plastic behavior,fracture toughness and strain rate sensitivity(SRS)of materials within micro/***,a nanomechanical model was developed for extracting hardness(h),young’s modulus(E)and yield stress(σY)from the characteristic load points which were subsequently analyzed by atomic force microscope(AFM)*** elasticity data and AFM data were then utilized for determination of plastic deformation in constituent *** displacement of the indentation gets the highest value for Mg matrix and between precipitates,depth is more in LPSO rather than that of *** serrated flow or the behavior of shear bands may originate from the side effect of the interface region in Mg alloys with *** can be deduced that the KIC produced by both L method and energy-based calculation are both reliable for KIC *** maximum load in simulation withμ=0.2 friction is marginally lesser than that of the frictionless(μ=0)one while elastic recovery of indentation withμ=0.2 is higher to some extent.

关键词： Long period stacking ordered(LPSO)phase Nanoindentation Elastic-plastic behavior Finite element method(FEM),Fracture toughness Strain rate sensitivity(SRS)

Influence of Ti^(4+) doping on hyperfine field parameters of Mg_(0.95)Mn_(0.05)Fe_(2-2x)Ti_(2x)O_4(0≤x≤0.7)

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journal of Central South University 2010年第6期17卷 1139-1143页

作者： KUMAR S PRAKASh R ALIMUDDIN ChOI h K KOO B h SONg j I ChUNg h jEONg h LEE C g School of Nano and Advanced Materials Engineering Changwon National UniversityChangwon 641773Korea Department of Mechanical Engineering Changwon National UniversityChangwon 641773Korea Department of Applied Physics Aligarh Muslim UniversityAligarh 202002India Department of Precision & Mechanical Engineering and BK21 Eco-Friendly heat & Cooling Energy Mechanical Research Team Gyeongsang National U niversityTongyeong 650160Korea

The mixed spinel ferrite system Mg0.95Mn0.05Fe2-2xTizxO4 （0 ≤x ≤ 0.7） was synthesized by the conventional solid-state reaction technique. The effect of Ti^4＋ doping was studied by using the Moessbauer spectroscopy measurements at room temperature. From the analysis of the Moessbauer spectra, it is observed that s-electron density, electric field gradient （EFg）, quadrupole coupling constant （QCC） and the net hyperfine magnetic fields acting on the Moessbauer nuclei-FeA^3＋ and FeB^3＋ change with the increase of Ti^4＋ doping in Mg0.95Mn0.05Fe2O4. The hyperfine magnetic field decreases with the increase of Ti^4＋ doping.

关键词： spinel ferrite Moessbauer spectroscopy hyperfine magnetic field isomer shift Ti^4+ doping

Impedance spectroscopy study on Mn_(1+x)Fe_(2-2x)Ti_xO_4(0≤x≤0.5) ferrites

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journal of Central South University 2010年第6期17卷 1133-1138页

作者： KUMAR S BATOO K M PRAKASh R ChOI h K KOO B h SONg j I ChUNg h jEONg h LEE C g School of Nano and Advanced Materials Engineering Changwon National UniversityChangwon 641773Korea King Abdullah Institute for Nanotechnology King Saud UniversityRiyadh 11451Saudi Arabia Department of Mechanical Engineering Changwon National UniversityChangwon 641773Korea Department of Precision & Mechanical Engineering and BK21 Eco-Friendly heat & Cold Energy Mechanical Research Team Gyeongsang National U niversityTongyeong 650160Korea

The complex impedance spectroscopy and surface morphology of Mn1+xFe2-2xTixO4(0≤x≤0.5) system,prepared using a conventional solid state reaction technique,were *** impedance spectroscopy measurements were carried out at room temperature in the frequency range of 42-5 *** electrical processes in the samples were modeled in the form of an equivalent circuit made up of a combination of two parallel RC circuits attributed to grain and grain *** DC conductivity obtained by extrapolation of AC data using impedance spectroscopy and four-probe method increases at 10% doping of Ti *** energy-dispersive X-ray(EDX) pattern confirmed the homogeneous mixing of the Mn,Fe,Ti and O atoms in pure and doped ferrite samples.

关键词： spinel ferrite magnetic properties impedance spectroscopy Ti4+ ions doping

Avalanche boron fusion by laser picosecond block ignition with magnetic trapping for clean and economic reactor

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high Power Laser Science and Engineering 2016年第4期4卷 1-9页

作者： h.hora g.Korn S.Eliezer N.Nissim P.Lalousis L.giuffrida D.Margarone A.Picciotto g.h.Miley S.Moustaizis j.-M.Martinez-Val C.P.j.Barty g.j.Kirchhoff Department of Theoretical Physics University of New South Wales ELI-Beamline Project Inst. PhysicsASCRPALS Center Institute of Nuclear Fusion Polytechnic University of Madrid Soreq Research Center Institute of Electronic Structure and Lasers FORTh Micro-Nano Facility Fondazione Bruno Kessler Department of Nuclear Plasma & Radiological Engineering University of Illinois Technical University Crete Laboratory of Matter Structure and Laser Physics Lawrence Livermore National Laboratory UjK Management gmbh

Measured highly elevated gains of proton–boron(hB11) fusion(Picciotto et al., Phys. Rev. X 4, 031030(2014))confirmed the exceptional avalanche reaction process(Lalousis et al., Laser Part. Beams 32, 409(2014); hora et al.,Laser Part. Beams 33, 607(2015)) for the combination of the non-thermal block ignition using ultrahigh intensity laser pulses of picoseconds duration. The ultrahigh acceleration above 10^(20) cm s^(-2)for plasma blocks was theoretically and numerically predicted since 1978(hora, Physics of Laser Driven Plasmas(Wiley, 1981), pp. 178 and 179) and measured(Sauerbrey, Phys. Plasmas 3, 4712(1996)) in exact agreement(hora et al., Phys. Plasmas 14, 072701(2007)) when the dominating force was overcoming thermal processes. This is based on Maxwell's stress tensor by the dielectric properties of plasma leading to the nonlinear(ponderomotive) force f_(NL)resulting in ultra-fast expanding plasma blocks by a dielectric explosion. Combining this with measured ultrahigh magnetic fields and the avalanche process opens an option for an environmentally absolute clean and economic boron fusion power reactor. This is supported also by other experiments with very high hB11 reactions under different conditions(Labaune et al., Nature Commun.4, 2506(2013)).

关键词： boron fusion energy dielectric nonlinear force explosion economic reactor environmentally clean energy picosecond-non-thermal plasma block ignition

Properties of Dispersion Casting of Y2O3 Particles in hypo,hyper and Eutectic Binary Al-Cu Alloys

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journal of Materials Science & Technology 2008年第1期24卷 57-59页

作者： j.j.Park g.h.Kim S.M.hong S.h.Lee M.K.Lee C.K.Rhee Nuclear Nano-Materials Development Lab. Korea Atomic Energy Research Institute （KAERI） 150 Deukjin-dongYuseong-gu Daejeon Korea

In the present work,the dispersion casting of Y-2O-3 particles in aluminum-copper alloy was investigated in terms of microstructural changes with respect to Cu contents of 20 （hypo）,33 （eutectic） and 40 （hyper） wt pct by scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）.For the fabrication of Al-Cu alloy dispersed Y-2O-3 ceramic particles,stir casting method was *** case of Al-20 wt pct Cu alloy （hypoeutectic）,SEM images revealed that primary Al was grown up in the *** that,eutectic phase with well dispersed ceramic particles was *** case of eutectic composition,Y-2O-3 particles were uniformly dispersed in the *** the Cu is added into Al up to 40 wt pct （hypereutectic）,primary phase was grown up without any Y-2O-3 ceramic particles in the early stage of ***, eutectic phase was formed with well dispersed ceramic *** can be concluded that Y-2O-3 ceramic particles is mostly dispersed in case of eutectic composition in Al-Cu alloy.

关键词： Dispersion casting Y2O3 particles Stir casting Al-Cu alloy

The FAST galactic Plane Pulsar Snapshot Survey. Ⅷ. 116 Binary Pulsars

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Research in Astronomy and Astrophysics 2025年第1期 77-109页

作者： P.F.Wang j.L.han Z.L.Yang T.Wang C.Wang W.Q.Su j.Xu D.j.Zhou Yi Yan W.C.jing N.N.Cai j.P.Yuan R.X.Xu h.g.Wang X.P.You National Astronomical Observatories Chinese Academy of Sciences School of Astronomy and Space Science University of Chinese Academy of Sciences Key Laboratory of Radio Astronomy and Technology Chinese Academy of Sciences Xinjiang Astronomical Observatory Chinese Academy of Sciences Department of Astronomy Peking University Kavli Institute for Astronomy and Astrophysics Peking University Department of Astronomy School of Physics and Materials ScienceGuangzhou University School of Physical Science and Technology Southwest University

Finding pulsars in binaries is important for measurements of the masses of neutron stars (NSs),for tests of gravity theories,and for studies of star *** are carrying out the galactic Plane Pulsar Snapshot survey (gPPS by using the Five-hundred-meter Aperture Spherical radio Telescope (FAST).here we present the Keplerian parameters for 116 newly discovered pulsars in the FAST gPPS survey and obtain timing solutions for 29 pulsars Companions of these pulsars are he white dwarfs (WDs),CO/ONe WDs,NSs,main sequence stars and ultra ligh objects or even *** observations uncover eclipses of eight binary *** optical counterpart for th companion of PSR j1908+1036 is *** Post-Keplerian parameter ■ for the double NS systems PSR j0528+3529 and j1844-0128 have been measured,with which the total masses of the binary systems ar determined.

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Liquid crystal-based structural color actuators

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Light(Science & Applications) 2022年第9期11卷 1994-2017页

作者： Pei Zhang Laurens T.de haan Michael g.Debije Albert P.h.j.Schenning Stimuli-responsive Functional Materials and Devices Department of Chemical Engineering and ChemistryEindhoven University of TechnologyP.O.Box 5135600 MB EindhovenThe Netherlands Institute for Complex Molecular Systems Eindhoven University of TechnologyDen Dolech 25600 MB EindhovenThe Netherlands SCNU-TUE joint Lab of Device Integrated Responsive Materials(DIRM) National Center for International Research on Green OptoelectronicsSouth China Normal UniversityGuangzhou 510006China

Animals can modify their body shape and/or color for protection,camouflage and *** adaptability has inspired fabrication of actuators with structural color changes to endow soft robots with additional *** liquid crystal-based materials for actuators with structural color changes is a promising *** this review,we discuss the current state of liquid crystal-based actuators with structural color changes and the potential applications of these structural color actuators in soft robotic devices.

关键词： structural crystal approach.

A comprehensive study on the processing of Co:ZnO nanostructured ceramics:Defect chemistry engineering and grain growth kinetics

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journal of Materials Science & Technology 2023年第7期138卷 221-232页

作者： R.T.da Silva j.M.Morbec g.Rahman h.B.de Carvalho Universidade Federal de Ouro Preto-UFOP Ouro PretoMG 35400-000Brazil School of Chemical and Physical Sciences Keele UniversityKeele ST55BGUnited Kingdom Department of Physics Quaid-i-Azam UniversityIslamabad 45320Pakistan Universidade Federal de Alfenas-UNIFAL Alfenas 37130-000Brazi

In this report,we present a systematic study on the preparation of Co:ZnO ceramics via a standard solid-state route from different Co precursors(Co_(3)O_(4),CoO,and metallic Co)and atmospheres(O_(2)and Ar).Particular emphasis is given to defect chemistry engineering and the sintering growth ***-principles calculations based on density functional theory are employed to determine the formation en-ergy of the main point defects in ZnO and Co:ZnO *** on the theoretical results,a set of chemical reactions is *** microstructural characterization is also performed to determine the degree of Co incorporation into the ZnO *** samples prepared in Ar atmosphere and metal-lic Co present the highest Co solubility limit(lower apparent Co incorporation activation energy)due to the incongruent ZnO *** of the parameters of the sintering growth kinetics reveals that Co_(3)O_(4)is the best sintering additive to achieve larger grain sizes,and possible higher densi-ties,in both sintering atmospheres,while metallic Co is the best to achieve the smallest grain size with higher Co concentration and homogeneous spatial distribution for a subsequent reduction of *** results show that the sintering in O_(2)effectively promotes zinc vacancies in the ZnO structure,while the sintering in Ar promotes zinc interstitial *** findings contribute to understanding the preparation of Co-doped ZnO ceramics and the sintering growth kinetics,which may improve the state of the art in processing the material at both bulk and nanometric scales.

关键词： Multifunctionality Zinc oxide Defect engineering growth kinetics

Mechanical Relaxation of a Ti36.2Zr30.3Cu8.3Fe4Be21.2 Bulk Metallic glass: Experiments and Theoretical Analysis

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Acta Metallurgica Sinica(English Letters) 2019年第6期32卷 726-732页

作者： j.C.Qiao Y.h.Chen g.j.Lyu K.K.Song j.M.Pelletier Y.Yao School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 710072China School of Mechanical Electrical and Information EngineeringShandong University(Weihai)Weihai 264209China MATEIS UMR CNRS5510Bat.B.PascalINSA-LyonUniversite de Lyon69621 Villeurbanne CedexFrance

The dynamic mechanical relaxation behavior of Ti36.2Zr30.3Cu8.3Fe4Be21.2 bulk metallic glass with good glass-forming ability was investigated by mechanical *** mechanical relaxation behavior was analyzed in the framework of quasi-point defects *** experimental results demonstrate that the atomic mobility of the metallic glass is closely associated with the correlation factorχ.The physical aging below the glass transition temperature T g shows a non-Debye relaxation behavior,which could be well described by stretched Kohlrausch exponential *** Kohlrausch exponentβaging reflects the dynamic heterogeneities of the metallic *** concentration of"defects"and atomic mobility decrease caused by the in situ successive heating during the mechanical spectroscopy experiments.

关键词： Metallic glasses Mechanical relaxation Physical aging Quasi-point defects