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Effect of Preparation Technique on Microstructure and Hydrogen Storage Properties of LaNi(3.8)Al(1.0)Mn(0.2) Alloys

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Journal of Materials Science & Technology 2016年第12期32卷 1332-1338页

作者： X.B.Han Y.Qian w.liu D.M.Chen K.Yang Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Institute of Metal Research Chinese Academy of Sdences Shenyang 110016 China

La Ni3.8Al1.0Mn0.2 alloy was prepared by vacuum induction melting and *** effects of different preparation techniques of the as-cast,cast then annealed,as-spun and spun then annealed alloys on the microstructure and hydrogen storage properties were *** results indicated that the non-Ca Cu5 phases in the alloy became tinier and more dispersive after annealing or melt-spinning compared to those of the as-cast *** in the spun then annealed alloy,the non-Ca Cu5 phases disappeared and only a single-phase with Ca Cu5 type structure was *** all the alloys,the cell volume was increased in an order of as-cast 〈 spun then annealed 〈 cast then annealed 〈 as-spun,and the change of plateau pressure showed the opposite trend with that of the cell *** plateau could be flattened after melt-spinning or annealing,and the spun then annealed alloy showed the minimum plateau *** absorption kinetics of the alloy was promoted after melt-spinning or *** is suggested that the change in cell volume and compositional homogeneity resulting from different preparation techniques contribute to the difference of the hydrogen storage properties of the investigated alloys.

关键词： Annealing Melt-spinning Metal hydride Hydrogen absorption

THE CHARACTERISTICS OF MICROSTRUCTURES AND PROPERTIES FOR ADVANCED ALUMINUM/SILICON CONTAINED HOT-ROLLED TRIP STEELS

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Acta Metallurgica Sinica(English Letters) 2004年第6期17卷 823-829页

作者： Y.Chern G.Y.Tang w.liu Q.liu P.H.Li X.Chen GraduateSchoolatShenzhenofTsinghuaUniversity Shenzhen518055China GraduateSchoolatShenzhenofTsinghuaUniversity Shenzhen518055China／／WuhanIronandSteelGroupCorporationWuhan430080China wuhanIronandSteelGroupCorporation Wuhan430080China

The microstructure characteristics with super fine ferrite grain size less than 5mm, appropriate retained austenite fraction around 5.0% and or removable abundant dislocations have been obtained by controlled rolling and cooling, which leads to well balance com- prehensive properties with high tensile strength of 510 and 615MPa, high elongation of 40% and 27%, low ratio of yield strength to tensile strength 0.83 and 0.80, as well as low ductile- brittle transition temperature less than -80 and -70℃ for advanced aluminum hot-rolled TRIP steel and silicon hot-rolled TRIP steel, respectively.

关键词： super fine ferrite grain removable dislocation retained austenite aluminum silicon hot-rolling TRIP steel

Structure and topological transport in Pb-doping topological crystalline insulator SnTe(001)film

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Journal of Materials Science & Technology 2020年第9期44卷 223-228页

作者： C.H.Yan F.wei Y.Bai F.wang A.Q.Zhang S.Ma w.liu Z.D.Zhang shenyang national laboratory for materials science institute of metal researchchinese academy of sciencesshenyang 110016china university of chinese academy of sciences beijing 100049china school of materials science and engineering university of science and technology of chinahefei 230026china

Topological crystalline insulator(TCI)as a new type of topological materials has attracted extensive research interests for its tunable topological *** its symmetry topological protection essence,the structure investigation provides a solid basement for tuning its topological transport *** SrTiO3(111)substrate,the SnTe film was found to be epitaxial growth only along[001]while not[111]*** detailed structural study was performed and a structural model was proposed to elucidate epitaxial growth of the SnTe(001)*** transport properties of SnTe(001)film were further investigated and a typical weak anti-localization effect was *** Pb-doping into SnTe,the bulk carriers were inhibited and its topological surface states were strengthened to induce the enhanced surface transport *** tunable multiple transport channels from the even Dirac cones,the TCI SnTe film systems will have the potential application in future spintronics devices.

关键词： Topological crystalline insulator Surface state SnTe

Magnetic Properties and Coercivity of MnGa Films Deposited on Different Substrates

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Journal of Materials Science & Technology 2017年第3期33卷 291-294页

作者： J.N.Feng w.liu w.J.Gong X.G.Zhao D.Kim C.J.Choi Z.D.Zhang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Powder and Ceramics Division Korea Institute of Materials Science

MnGa films were grown by magnetron sputtering on thermally oxidized Si（Si/SiO2） and glass substrates. Films grown on single-crystal Si（100） substrate with different underlayers were prepared for comparison. It is found that the Si/SiO2 substrate is more suitable for growing high-coercivity MnGa films than the glass substrate, which is the result of the isolated-island-like growth. A coercivity of 9.7 kOe can be achieved for the 10 nm MnGa films grown on Si/SiO2 substrate at substrate temperature TS of 450 °*** experimental conditions are specified by changing the thickness of the MnGa films and the temperature of the substrates.

关键词： Atomic force microscopy Coercivity Magnetic properties Magnetron sputtering Thin film

Competition between multiphoton/tunnel ionization and filamentation induced by powerful femtosecond laser pulses in air

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Chinese Optics Letters 2003年第1期1卷 56-59页

作者： w.liu Q.Luo S.L.Chin Department de physique de genie physique et d'optique and Centre d'optiquephotonique et laser (COPL) Universite Laval Quebec (Quebec) Canada G1K 7P4Department de physique de genie physique et d'optique and Centre d'optiquephotonique et laser (COPL) Universite Laval Quebec (Quebec) Canada G1K 7P4Department de physique de genie physique et d'optique and Centre d'optiquephotonique et laser (COPL) Universite Laval Quebec (Quebec) Canada G1K 7P4

In this work we present experiments by focusing 42 femtosecond laser pulses in air using three differentfocal length lenses: f=100, 30 and 5 cm. For the longest focal length, only the filament, which is aweak plasma column,is observed. when the shorter focal length lens is used, a high density plasma isgenerated near the geometrical focus and coexists with a weak plasma channel of the filamemt. Under thetightest focusing condition, filamentation is prevented and only a strong plasma volume appears at tehgeometrical focus.

关键词： in as it be is Competition between multiphoton/tunnel ionization and filamentation induced by powerful femtosecond laser pulses in air by line

Magnetization reversal of antiferromagnetically coupled perpendicular anisotropy films driven by current

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Journal of Materials Science & Technology 2018年第5期34卷 832-835页

作者： X.T.Zhao Y.Q.Zhao w.liu Z.M.Dai T.T.wang X.G.Zhao Z.D.Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences

By inserting an ultrathin Pt layer at Co/Ru interface,we established antiferromagnetic coupling with outof-plane magnetization in Co/Ru/Co film stacks fabricated by *** achieve configuration suitable for free layer,the magnetic properties of the stacks have been investigated by changing the thickness of Co,Ru and Pt layers using an orthogonal wedges *** is found that magnetic properties for upper Co layer thinner than 0.5 nm are sensitive to little change in Ru *** continuity of upper Co layer by slightly increasing the thickness can effectively increase the squareness of minor *** switching magnetization of synthetic antiferromagnetic（SAF） structure is achieved by DC current under an in-plane static magnetic field of ± 500 *** structure is very promising for free layer in spintronic application.

关键词： Magnetic materials Multilayer structure wedge Exchange coupling Antiferromagnetic

Logical Architecture Framework of Air-Rail Intermodality System

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Logical Architecture Framework of Air-Rail Intermodality Sys...

Corrosion and cavitation erosion resistance enhancement of cast Ni–Al bronze by laser surface melting

International Conference on Industrial Technology and Management Science(ITMS 2015)

作者： w.liu J.Ouyang Comprehensive Transportation Institute Civil Aviation University of China

In China, research and development of air-rail intermodality transportation has not been fleshed out. This paper aims to provide a theoretical support for the development of air-rail intermodality. Firstly, the concept of air-rail intermodality system is put forward. without regard to management system and technical factors, but from a logical point of system function, we describe the internal structure of the system using hierarchical data flow diagram（DFD） and process oriented method for the first time. Based on the function of air-rail intermodality system, the top-level logical architecture framework is built, which is composed of seven subsystems. They are defined and explained respectively. At last, the two main service modulesintegrated ticketing system and through baggage handling system are described in detail.

关键词： air-rail intermodality logical architecture framework integrated ticketing through baggage handling

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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.Li H.N.Zhang N.Xu G.Y.Zhang Y.F.Bao w.liu Z.G.liu Y.X.Qiao Engineering Research Center of Dredging Technology of Ministry of Education Hohai UniversityChangzhou213022JiangsuChina College of Mechanical and Electrical Engineering Hohai UniversityChangzhou213022JiangsuChina College of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang212003JiangsuChina

Laser surface melting (LSM) was applied on a cast Ni–Al bronze (NAB), which was a crucial material for marine ship propellers. A 720 μm-thick LSM layer with fine equiaxed and dendritic microstructures was obtained. After immersion for 30 days, the corrosion rate of cast NAB was reduced by 25% after LSM. Preferential corrosion occurred and deep corrosion pits appeared at α + κIII microstructure for the cast NAB. LSM NAB underwent general corrosion, and a much more protective film formed on the surface because of the homogenized microstructure. The mass loss of the cast NAB was approximately 2.1 times larger than that of LSM NAB after cavitation erosion (CE) in 3.5 wt.% NaCl solution for 5 h. For the two materials, the mechanical impact effect was dominantly responsible for CE damage. Therefore, the improved hardness and homogenized microstructure contributed to the improved CE resistance of LSM NAB. CE destructed the film, shifted the open circuit potential toward a more negative value, and raised the current density by an order of magnitude. Corrosion at the cast eutectoid microstructure and the dendrites of LSM NAB facilitates the degradation under the cavitation attack. CE-corrosion synergy was largely caused by corrosion-enhanced-CE.

关键词： Laser surface melting Ni-Al bronze Microstructure Corrosion Cavitation erosion Synergy

EFFECTS OF HDDR PROCESS ON STRUCTURE AND MAGNETIC PROPERTIES OF Nd(Fe,Ti)_(12)N_δ PREPARED BY MECHANICAL ALLOYING

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Acta Metallurgica Sinica(English Letters) 1998年第1期11卷 68-78页

作者： B.ZCui X.K.Sun X.G.Zhao w.liu Q.F.Xiao T.Zhao Z.D.Zhang Y.C.Sui Chinese Acad of Sciences Shenyang China

The effects of the hydrogenation-disproportionation-desorption-recombination (HDDR) process on the structure and the magnetic properties of the mechanical alloying (MA) prepared Nd8Fe84 Ti8 alloy and its nitride counterpart have been studied in detail. It has been found that Nd(Fe, Ti)12Hδ is formed in the temperature range from 300 to 550°℃. The disproportionation is ready to start at 550°℃ and is complete at 960°℃.The desorption and the recombination are almost synchronized. The phase of Nd(Fe,Ti)7 is formed at 750°℃ during the HDDR treatment. with increasing temperature of HDDR process, the metastable structure of TbCu7 type is gradually transformed into the structure of ThMn12 type. The intrinsic coercivity and the maximum magnetic energy product increase with increasing temperature of HDDR process.

关键词： Nd(Fe Ti)_(12)N_δ compound,magnetic property hydrogenation