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NANO-MULtILAYERS WItH HIGH PERPENDICULAR ANISOtROPY FOR MAGNEtIC RECORDING

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Acta Metallurgica Sinica(English Letters) 2003年第4期16卷 261-265页

作者： t.yang B.H.Li DepartmentofMaterialsPhysics UniversityofScienceandTechnologyBeijingBeijing100083China InformationStorageMaterialsLaboratory ToyotaTechnologicalInstituteNagoya468-8511JapanManuscriptreceived25November2002

(FePt/Ag)n nano-multilayers were deposited on MgO (100) single crystal with laser ablation and then subjected to annealing. FePt L1o grains with (001) texture and thus a large perpendicular magnetic anisotropy constant Ku of the order of 106 J/m3 were formed. A thick Ag layer is found to be favorable for decreasing the dispersion of the easy axis for magnetization. the measurement of time decay of magnetization gave rise to a small activation volume of the order of 10-25m3, showing the promising of being the recording medium for future high density perpendicular recording.

关键词： recording media perpendicular magnetic anisotropy activation volume

Influences of residual stress and micro-deformation on microstructures and mechanical properties for ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy produced by laser powder bed fusion

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Journal of Materials Science & technology 2021年第16期75卷 174-183页

作者： C.C.Zhang H.L.Wei t.t.Liu L.Y.Jiang t.yang W.H.Liao National Joint Engineering Research Center of NC Forming technology and Equipment School of Mechanical EngineeringNanjing University of Science and TechnologyNanjing 210094China

Laser powder bed fusion(LPBF)yields unique advantages during the fabrication of titanium *** the present work,ti-6.5 Al-3.5 Mo-1.5 Zr-0.3 Si alloy specimens with excellent mechanical performances were fabricated by *** as-built specimens displayed relatively high strength and ductility under modest volume energy densities(VEDs),whereas they manifested high strength with low ductility under high *** investigate the key reason of this phenomenon,the specimens were designed with two VEDs ranges of 60 J/mm^(3) and 85 J/mm^(3).Special attention was paid to the influences of residual stress and micro-deformation on microstructures and mechanical properties for the first *** results indicated that the residual stresses and relative density of the 60 J/mm^(3) range specimens were higher than that of the 85 J/mm3 range *** multiplication and dislocation movement promoted by the residual stress were hindered by the initialα’phase grain boundary(prior-α’GB),leading to the formation ofα’metastable *** mean tensile strength and elongation of the 60 J/mm^(3) range specimens were 1248.1 MPa and 12.3%,respectively,whereas the corresponding values for the 85 J/mm^(3) range specimens were 1405.3 MPa,5.0%,*** deformation,the strength and ductility of the specimens were first improved by lamellar structures generated from prior-α’phases,and then effectively enhanced by the interaction between the{10–12}twins and ***,pores significantly reduced the ductility;hence,high VED specimens with large twins and numerous large pores increased the strength and reduce the ductility.

关键词： Laser powder bed fusion ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy Residual stress twin Mechanical properties

Enhanced helium ion irradiation tolerance in a Fe-Co-Ni-Cr-Al-ti high-entropy alloy with L12 nanoparticles

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Journal of Materials Science & technology 2023年第12期143卷 169-177页

作者： Y.L.Zhao F.L.Meng t.yang J.H.Luan S.F.Liu G.M.Yeli W.t.Lin W.H.Liu X.J.Liu C.t.Liu J.J.Kai School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering Mechanical Behavior Division of Shenyang National Laboratory for Materials ScienceCity University of Hong KongHong KongChina Department of Mechanical Engineering City University of Hong KongHong KongChina Institute of Nuclear&New Energy technology Tsinghua UniversityBeijing 100084China

L12-strengthened high entropy alloys(HEAs)with excellent room and high-temperature mechanical prop-erties have been proposed as promising candidates as structural materials for advanced nuclear ***,knowledge about their radiation response is fairly *** the present work,a novel HEA with a high density of L12 nanoparticles was irradiated with He ion at 500°*** electron microscope(tEM)and atom probe tomography(APt)were employed to study the evolution of mi-crostructural stability and radiation-induced *** to the single-phase FeCoNiCr HEA,the main microstructural features were numerous large faulted dislocation loops and helium *** the irradiation resistance of the present L12-strengthened HEA is much improved in terms of reduced bubble size,which could be attributed to the considerable He trapping efficiency of the coherent pre-cipitate/matrix interface and the enhanced capability of the interface for damage elimination when the matrix channel width is *** analysis revealed that an inverse-Kirkendall-mechanism-dominated radiation-induced segregation(RIS)occurs around bubbles,where a significant Co enrichment and Ni de-pletion can be clearly *** addition,the competing dynamics of ballistic mixing and elemental clustering that raised from the irradiation-enhanced diffusion in a highly supersaturated matrix,along with the low precipitation nucleation barrier due to the small lattice misfit,lead to a dynamical pre-cipitation dissolution and re-precipitation appears under *** a promising phenomenon is expected to promote a potential self-healing effect and could in turn provide a sustainable irradiation tolerance over the operational lifetime of a reactor.

关键词： L12 nanoparticles High-entropy alloy Helium bubble Phase stability Radiation-induced segregation

thermal stability and deformation mechanisms in Ni-Co-Fe-Cr-Al-ti-Nb-type nanoparticle-strengthened high-entropy alloys

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Journal of Materials Science & technology 2023年第36期167卷 171-183页

作者： J.X.Hou J.Y.Zhang J.X.Zhang J.H.Luan Y.X.Wang B.X.Cao Y.L.Zhao Z.B.Jiao X.J.Liu W.W.Song P.K.Liaw t.yang Department of Materials Science and Engineering Hong Kong Institute for Advanced StudyCity University of Hong KongHong KongChina School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina Steel Institute RWTH Aachen UniversityAachen 52072Germany Institute of Materials Engineering University of KasselKassel 334125Germany Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996-2200USA City University of Hong Kong China

the precipitate morphologies,coarsening kinetics,elemental partitioning behaviors,grain structures,and tensile properties were explored in detail for L1_(2)-strengthened Ni_(39.9)Co_(20)Fe_(15)Cr_(15)Al_(6)ti_(4-x)Nb_(x)B_(0.1)(x=0 at.%,2 at.%,and 4 at.%)high-entropy alloys(HEAs).By substituting ti with Nb,the spheroidal-to-cuboidal precipitate morphological transition,increase in the coarsening kinetics,and phase decomposition upon aging at 800°C *** excessive addition of Nb brings about the grain boundary precipitation of an Nb-rich phase along with the phase decomposition from the L1_(2)to lamellar-structured D019 phase upon the long-term aging *** partially substituting ti with Nb,the chemically complex and thermally stable L12 phase with a composition of(Ni_(58.8)Co_(9.8)Fe_(2.7))(Al_(12.7)ti_(5.8)Nb_(7.5)Cr_(2.3))ensures the stable phase structure and clean grain boundaries,which guarantees the superb high-temperature mechanical properties(791±7 MPa for yielding and 1013±11 MPa for failure)at 700℃.Stacking faults(SFs)were observed to prevail during the plastic deformation,offering a high work-hardening capability at 700°*** anomalous rise in the yield strength at 800℃was found,which could be ascribed to the multi-layered super-partial dislocations with a cross-slip configuration within the L1_(2)particles.

关键词： High-entropy alloys Coarsening kinetics Coherent precipitation strengthening Mechanical properties

Guest Editorial for Special Issue on Blockchain for Internet-of-things and Cyber-Physical Systems

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IEEE/CAA Journal of Automatica Sinica 2021年第12期8卷 1867-1867页

作者： Mohammad Mehedi Hassan Giancarlo Fortino Laurence t.yang Hai Jiang Kim-Kwang Raymond Choo Jun Jason Zhang Fei-Yue Wang King Saud University RiyadhSaudi Arabia University of Calabria Italy St.Francis Xavier University Canada Arkansas State University USA Department of Information Systems and Cyber Security University of Texas at San AntonioSan AntonioTX 78249-0631USA Wuhan University WuhanChina Institute of Automation Chinese Academy of SciencesBeijing 100190China

Cyber-physical systems(CPS)are increasingly commonplace,with applications in energy,health,transportation,and many other *** of the major requirements in CPS is that the interaction between cyber-world and man-made physical world(exchanging and sharing of data and information with other physical objects and systems)must be safe,especially in bi-directional *** particular,there is a need to suitably address security and/or privacy concerns in this human-in-the-loop CPS ***,existing centralized architecture models in CPS,and also the more general Iot systems,have a number of associated limitations,in terms of single point of failure,data privacy,security,robustness,*** limitations reinforce the importance of designing reliable,secure and privacy-preserving distributed solutions and other novel approaches,such as those based on blockchain technology due to its features(e.g.,decentralization,transparency and immutability of data).this is the focus of this special issue.

关键词： Internet limitations transparency

隔离房地产泡沫风险——基于住房增值参与证券(HAPN)的设计模拟

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浙江大学学报（人文社会科学版） 2013年第1期43卷 32-42页

作者：杨太乐刘峰林晨美国安赋金融工程集团马里兰罗克维尔20850 美国住房与城市发展部华盛顿20410

住房作为一种特殊商品具有消费和投资的双重属性。一方面,住房给居住者提供最基本的生活要素,满足消费效用;另一方面,住房又可以作为投资品,基于投资者风险偏好,带来短期的出租收入和长期的资产增值收益。这种消费和投资的二重性,在长... 详细信息

住房作为一种特殊商品具有消费和投资的双重属性。一方面,住房给居住者提供最基本的生活要素,满足消费效用;另一方面,住房又可以作为投资品,基于投资者风险偏好,带来短期的出租收入和长期的资产增值收益。这种消费和投资的二重性,在长期内为衍生关系,在短期内却有着内在矛盾。现有住房所有权制度将住房的二重性捆绑在一起,现存住房金融制度通过信贷杠杆更加重了这一矛盾。而这种特性和制度安排对房地产经济的波动起伏具有放大器的作用。为了隔离住房房地产泡沫,可以借助住房金融创新的设计思路,通过住房增值参与证券(HAPN)这种住房金融创新工具进行模拟分析和论证。结果表明,运用住房增值参与证券可以建立住房消费与炒房投机之间的防火墙,隔断房地产泡沫风险,促进住房市场健康发展。

关键词：住房消费住房投资房地产泡沫住房增值参与证券(HAPN) 住房所有权

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串联DC-SQUID阵列的实验研究

低温物理学报 1999年第1期21卷 71-76页

作者：陈烈陈珂杨涛吴培钧中国科学院物理研究所超导国家重点实验室西北大学物理系近代物理研究所

本文研究了高温超导３×３并联ＤＣＳＱＵＩＤ串联阵列台阶约瑟夫森结。其性能指标：７７Ｋ下，磁通白噪声为８．９×１０－５Φ０／Ｈｚ，磁场灵敏度在白噪声段为２×１０－１１Ｔ／Ｈｚ．研究表明，约瑟夫森结的并联对衬底台阶晶界... 详细信息

本文研究了高温超导３×３并联ＤＣＳＱＵＩＤ串联阵列台阶约瑟夫森结。其性能指标：７７Ｋ下，磁通白噪声为８．９×１０－５Φ０／Ｈｚ，磁场灵敏度在白噪声段为２×１０－１１Ｔ／Ｈｚ．研究表明，约瑟夫森结的并联对衬底台阶晶界结离散性较大的器件参量有很好的补偿作用

关键词：阵列结构约瑟夫森结计算机体系结构超导弱连结超导量子磁强计超导器件超导磁强计 DC-SQUID 磁通实验研究

MICROStRUCtURAL CHARACtERIZAtION OF SPIN—VALVE MULtILAYERS BY X—RAY ANOMALYOUS DIFFRACtION tECHNIQUE

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Beijing Synchrotron Radiation Facility 2001年第2期 47-53页

作者： M.XU G.M.LUO t.yang C.C.CHAI Z.H.MAI W.Y.LAI H.Y.JIANG Z.H.WU InstituteofHighEnergyPhysics ChineseAcademyofSciencesBeijing100039P.R.China InstituteofPhysicsCenterforCondensedMatterPhysics ChineseAcadermyofSciencesBeijing100080P.R.China

It is impossible to directly analyze the microstructure of spin-valve multilayers based on Ni,F,Cu and Mn by a conventional X-ray diffraction technique because the lattice parameter and atomic sattering factor sof them are very *** solve this problem, we use an x-ray anomalous diffraction technique to characterize the microstructures of the [Ni80Fe20/Fe50Mn50]15 and [Ni80Fe20/Cu]15 superlattice *** results show that more diffraction peaks and higher internsity in the reflectivety profile are observed when the incident energy is close to the absorption edge of the lighter element(Mn) in [Ni80Fe20/Fe50Mn50]15 multilayer systems and to the absorption edge of the heavier element (Cu) in the [Ni80Fe20/Cu]15 multilayer *** interface and periodic structure of [Ni80F20/Fe50Mn50]15 are more perfect than that of the [Ni80Fe20/Cu]15 *** above results are disussed in this paper.

关键词： X射线衍射分析微观结构超晶格原子分布

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HtS台阶边缘结──特性和制作的实验研究

低温物理学报 1999年第1期21卷 26-30页

作者：陈珂杨涛吴陪均陈烈中国科学院物理研究所、超导国家重点实验室西北大学物理系、西北大学近代物理研究所

本文用原子力显微镜（ＡＦＭ）对有不同伏安特性的台阶边缘结之台阶形貌进行了仔细测量．结果表明：台阶边缘晶界结特性受非平面衬底离子束刻蚀剖面细节的影响．文中对刻蚀剖面形貌的细节对结性能的影响进行了分析，并讨论了台阶结制作... 详细信息

本文用原子力显微镜（ＡＦＭ）对有不同伏安特性的台阶边缘结之台阶形貌进行了仔细测量．结果表明：台阶边缘晶界结特性受非平面衬底离子束刻蚀剖面细节的影响．文中对刻蚀剖面形貌的细节对结性能的影响进行了分析，并讨论了台阶结制作工艺重复性差，成品率低的原因

关键词：离子束刻蚀非平面衬底刻蚀剖面 HtS