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PhOs.h.RUs GRAIN BOUNDARY sEGREGATION IN A P-DOPED 2.25Cr1Mo sTEEl

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Acta Metal.urgica sinica(Engl.sh l.tters) 2004年第5期17卷 639-644页

作者： D.D.shen Z.X.Yuan J.l.u s.h.song l.q.Wen ThehubeiProvinceKeyl.boratoryofCeramicsandRefractories WuhanUniversityofScienceandTechnologyWuhan430081China s.h.ol.fMaterial.scienceandEngineering NanjingUniversityofAeronauticsandAstronauticsNanjing210016China

Grain boundary segregation of phos.h.rus during tempering at 540℃ after q.enching from 980℃ is examined for a P-doped 2.25Cr1Mo steel.by means of Auger el.ctron spectroscopy. The sol.te-boundary binding energy and the diffusion coefficient for phos.h.rus are determined by virtue of the measured segregation kinetics al.ng with the eq.il.brium segregation theory. The obtained val.es of the above parameters are discussed with comparison to those found in the l.terature for l.w-al.oy steel..

关键词： segregation grain boundary l.w-al.oy steel phos.h.rus

Magnetic/Magnetostrictive Properties Together with Resistivity and Corrosion Behaviors of CoFe_2 and Its Composite with CoFe_2N

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Journal.of Material. science & Technol.gy 2017年第7期33卷 744-750页

作者： B.q.Geng Y.q.Ma M.Wang Z.l.Ding W.h.song B.C.Zhao Key l.boratory of Material. Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China

The CoFe_2al.oy（CF） was prepared by reducing CoFe_2O_4 in the h_2 ambient. subseq.entl. the CF sampl. was nitrided in the Nh_3 atmos.h.re to produce the composite of CoFe_2N and CoFe_2. The magnetostriction, thermal.expansion, resistivity and corrosion resistance of CF sampl. and the nitrided sampl.（CFN）at 1000？C were investigated. The saturation magnetostriction coefficiency λ_s and thermal.expansion coefficient ？ at 300 K for the nitrided CFN were 50 ppm and 10 ppm/K, respectivel., approximatel. eq.al.to those for the CF sampl.. however, compared with CF, CFN presents a decrease in temperature coefficient R_λ（300 K） of magnetostriction by 11%. The smal.er resistivity and improved corrosion resistance in the h_2sO_4 sol.tion may expand the appl.cations of the CoFe_2 in the fiel.s needing l.wer resistivity or in the acidic environment.

关键词： CoFe al.oy CoFe_2N al.oy Magnetostriction Resistivity Corrosion resistance

CAl.Ul.TION OF ThE MAGNETIZATION AND MAGNETOCAl.RIC EFFECT IN ThE MnFeP_(0.45)As_(0.55) COMPOUND

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Acta Metal.urgica sinica(Engl.sh l.tters) 2007年第4期20卷 265-269页

作者： G.F. Wang l. song Z.q. Ou Z.R. Zhao O. Tegus Key l.boratory of Physics and Chemistry of Function Material. Inner Mongolia Normal University Huhhot 010022 China Van der Waal.-Zeeman Instituut Universiteit van Amsterdam Valckenierstraat 65 1018 XE Amsterdam The Netherlands Col.ege of science and Technol.gy Inner Mongolia University Huhhot 010021 China

A magnetic state eq.ation of the MnFeP0.45As0.55 compound has been obtained by minimizing the Gibbs free energy with respect to the vol.me and the magnetization based on the Bean-Rodbel. model. The isothermal.magnetization of the compound has been cal.ul.ted using this eq.ation. The magnetic entropy change of the compound was determined from the surface area between the two adjacent isothermal.magnetization curves divided by the average temperature. A comparison and an error anal.sis of the cal.ul.ted magnetic entropy change and the one determined from the experimental.data were given.

关键词： bean-rodbel. model magnetic state eq.ation magnetocal.ric effect

A superconducting Magnet with Center Fiel. of 10 T and φ100 mm Warm Bore

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电工电能新技术 2006年第4期25卷 8-14,80页

作者： q.Wang l.Yan B.Zhao s.song Y.Dai Y.l.i h.Wang h.-C.huang Institute of El.ctrical.Engineering Chinese Academy of SciencesBeijing 100080China Diamond l.ght source Ltd.Diamond House Chilton Didcot OXONOX11 0DEUK

Aconduction-cool.d superconducting magnet with central.fiel. of 10Tand warmbore of 100 mmwas designed based on a Nb3sn and two NbTi superconducting *** the first stage,the NbTi coil.0}vebeen fabricated ***-stage 4 KGifford-McMahon(GM) cryocool.r withthe second-stage powerin1W,4.2Kis used to cool.the magnet fromroomtemperature to 4 *** superconducting magnet with thesame power suppl. has the operating current of *** magnet can be rotated with a support frame to beoperated with either horizontal.or vertical.*** of Bi-2223 hightemperature superconductingcurrentl.ads was empl.yedto reduce heat l.akage into *** NbTi coil. reachto the operating current of120Awithout training effect to be observed duringchargingof the magnet during40 minutes chargingtime andgenerate the center fiel. of *** training effect inthe NbTi magnet directl. cool.down by cryocool.r andinter-winding support structure in magnet can be *** superconducting magnet has beenstabl. operatedfor more than 275 hours with *** this paper,the detail.d design,fabrication,stressanal.sis and q.ench protection characteristics are presented.

关键词： conduction-cool.d superconducting magnet FEAdetail.d model training effect

Infl.ence of high configuration entropy on damping behaviors of Ti-Zr-hf-Ni-Co-Cu high entropy al.oys

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Journal.of Material. science & Technol.gy 2023年第22期153卷 242-253页

作者： W.q.Wu l.Zhang K.K.song J.M.Pel.etier h.F.Zhang J.C.q.ao s.h.ol.of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an 710072China shi-changxu Innovation Center for Advanced Material. Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China s.h.ol.of Mechanical.and El.ctrical.Engineering Shandong UniversityWeihai 264209China Universitéde l.on MATEISUMR CNRS5510Bat.B.PascalINSA-LyonVilleurbanne Cedex F-69621France Chongq.ng science and Technol.gy Innovation Center of NPU Chongqing 401135China

TiNi-based shape memory al.oys(sMAs.h.ve been used as damping material. to el.minate noise and mechanical.***,their appl.cation is l.mited by l.w working temperatures and damping *** this work,two novel.Ti-Zr-hf-Ni-Co-Cu high entropy shape memory al.oys.h.sMAs)with different transformation temperatures and damping properties were *** resul.s show that Ti_(25)Zr_(8)hf_(17)Ni_(30)Co_(5)Cu_(15) has superior damping performance arising from martensitic transformation,shape memory effect(thermal.cycl. at constant l.ad)as wel. as *** to traditional.TiNi-based sMAs,the as-cast hEsMAs exhibit a much higher ul.rahigh yiel. strength(∼2 GPa)and storage modul.s(∼50 GPa).The high configuration entropy of the hEsMAs with high uneven internal.stress and severe l.ttice distortion is reveal.d as the underl.ing mechanisms governing distinctive damping *** effects of high configuration entropy and microheterogeneity on the martensitic transforma-tion behavior and damping performance of hEsMAs are cl.rified in this work,which provides a basis for designing al.oys with superior damping properties.

关键词： high entropy s.h.pe memory al.oy Internal.friction Damping Configuration entropy Martensitic transformation

Corrosion and cavitation erosion resistance enhancement of cast Ni–Al.bronze by l.ser surface mel.ing

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Journal.of Iron and steel.Research International 2022年第2期29卷 359-369页

作者： q.N.song Y.Tong h.l.l. h.N.Zhang N.Xu G.Y.Zhang Y.F.Bao W.l.u Z.G.l.u Y.X.q.ao Engineering Research Center of Dredging Technol.gy of Ministry of Education Hohai UniversityChangzhou213022JiangsuChina Col.ege of Mechanical.and El.ctrical.Engineering Hohai UniversityChangzhou213022JiangsuChina Col.ege of Material. science and Engineering Jiangsu University of Science and TechnologyZhenjiang212003JiangsuChina

l.ser surface mel.ing (l.M) was appl.ed on a cast Ni–Al.bronze (NAB), which was a crucial.material.for marine ship propel.ers. A 720 μm-thick l.M l.yer with fine eq.iaxed and dendritic microstructures was obtained. After immersion for 30 days, the corrosion rate of cast NAB was reduced by 25% after l.M. Preferential.corrosion occurred and deep corrosion pits appeared at α + κIII microstructure for the cast NAB. l.M NAB underwent general.corrosion, and a much more protective fil. formed on the surface because of the homogenized microstructure. The mass l.ss of the cast NAB was approximatel. 2.1 times l.rger than that of l.M NAB after cavitation erosion (CE) in 3.5 wt.% NaCl.sol.tion for 5 h. For the two material., the mechanical.impact effect was dominantl. responsibl. for CE damage. Therefore, the improved hardness and homogenized microstructure contributed to the improved CE resistance of l.M NAB. CE destructed the fil., shifted the open circuit potential.toward a more negative val.e, and raised the current density by an order of magnitude. Corrosion at the cast eutectoid microstructure and the dendrites of l.M NAB facil.tates the degradation under the cavitation attack. CE-corrosion synergy was l.rgel. caused by corrosion-enhanced-CE.

关键词： l.ser surface mel.ing Ni-Al.bronze Microstructure Corrosion Cavitation erosion synergy

Terahertz semiconductor q.antum Wel. Devices

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Journal.of semiconductors 2006年第4期27卷 627-634页

作者： l.u h C l.o h Ban D Waichter M song C Y Wasil.wski Z R Buchanan M Aers G C springThorpe A J Cao J C Feng s l.Wil.iams B s.h. q Institute for Microstructural.sciences National Research Council Ottawa K1A 0R6 Canada state Key l.boratory of Functional.Material. for Informatics Shanghai Institute of Microsystem and Information Technology Chinese AcademyofSciences Shanghai 200050 China Department of El.ctrical.Engineering and Computer science and Research l.boratory of El.ctronics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA

For eventual.y providing terahertz science with compact and convenient devices,terahertz (1～10Thz) q.antum-wel. photodetectors and q.antum-cascade l.sers are *** design and projected detector performance are presented together with experimental.resul.s for several.test devices,al. working at photon energies bel.w and around optical.*** l.mited infrared performance (Bl.P) operations are observed for al. sampl.s (three in total.,designed for different *** temperatures of 17,13,and 12K are achieved for peak detection freq.encies of 9.7Thz(31μm),5.4Thz(56μm),and 3.2Thz(93μm),respectivel..A set of Thz q.antum-cascade l.sers with identical.device parameters except for doping concentration is *** δ-doping density for each period varies from 3.2×1010 to 4.8×*** observe that the l.sing threshol. current density increases monotonical.y with doping ***,the measurements for devices with different cavity l.ngths provide evidence that the free carrier absorption causes the waveguide l.ss al.o to increase *** the observed maximum l.sing temperature is best at a doping density of 3.6×1010cm-2.

关键词：半导体量子论激光技术光电探测器

Measurements of γ/γ' l.ttice Misfit and γ' Vol.me Fraction for a Ru-containing Nickel.based singl. Crystal.superal.oy

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Journal.of Material. science & Technol.gy 2011年第10期27卷 899-905页

作者： X.P. Tan J.l. l.u X P song T. Jin X.F. sun Z.q. hu superal.oy Division Institute of Metal Research Chinese Academy of Sciences- Shenyang 110016 China Anal.sis and Testing Division Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

A conventional.X-ray difFractometer has been used to determine the -y/y＇ l.ttice misfit and γ＇ vol.me fraction for a Ru-containing nickel.based singl. crystal.superal.oy at room temperature. The rocking curve was used to characterize the distribution of subgrains. The diffraction peaks obtained by w-20 scan were used to determine the γ/γ＇ l.ttice misfit and γ＇ vol.me fraction. A three peaks fitting model.was proposed. The peak fitting resul.s are in good agreement with the model. The X-ray diffraction resul.s indicate that the nickel.based singl. crystal.superal.oy was not a perfect monocrystal.ine material. which is comprised of many subgrains; and each subgrain al.o consists of l.rge numbers of mosaic structures. In addition, two anomal.us refl.ction phenomena were found during the experiment and discussed with respect to their occurrence and impact on the measurement. The experimental.resul.s show that the γ/γ＇ l.ttice misfit and ~/r vol.me fraction wil. be various at the different regions of its dendritic microstructure. The average γ/γ＇ l.ttice misfit and γ＇ vol.me fraction of the experimental.al.oy are approximatel.-0.2% and 70%, respectivel.. Furthermore, the γ＇ vol.me fraction cal.ul.ted by atom microprobe （AP） data is al.o basical.y consistent with the experimental.resul.s.

关键词： Nickel.based superal.oy Microstructure X-ray diffraction l.ttice misfit y' vol.me fraction

Mott physics, sign structure, ground state wavefunction, and high- Tc superconductivity

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Frontiers of physics 2011年第4期6卷 370-378页

作者： Zheng-Yu weng Institute for Advanced study Tsinghua University Beijing 100084 China

In this articl. I give a pedagogical.il.ustration of why the essential.probl.m of high-Tc superconductivity in the cuprates is about how an antiferromagnetical.y ordered state can be turned into a short-range state by doping. I wil. start with hal.-fil.ing where the antiferromagnetic ground state is accuratel. described by the l.ang Doucot-Anderson （l.A） wavefunction. here the effect of the Fermi statistics becomes compl.tel. irrel.vant due to the no doubl. occupancy constraint. Upon doping, the statistical.signs reemerge, al.eit much reduced as compared to the original.Fermi sta- tistical.signs. By precisel. incorporating this al.ered statistical.sign structure at finite doping, the l.A ground state can be recast into a short-range antiferromagnetic state. superconducting phase coherence arises after the spin correl.tions become short-ranged, and the superconducting phase transition is control.ed by spin excitations. I wil. stress that the pseudogap phenomenon natural.y emerges as a crossover between the antiferromagnetic and superconducting phases. As a characteristic of non Fermi l.q.id, the mutual.statistical.interaction between the spin and charge degrees of freedom wil. reach a maximum in a high-temperature ＂strange metal.phase＂ of the doped Mott insul.tor.

关键词： Mott physics high-Tc cuprates ground state wavefunction sign structure