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In-situ loading neutron-diffraction studies of a cobalt-based superalloy

中国有色金属学会会刊：英文版 2006年第A02期16卷 144-148页

作者： M. L. BENSON P. K LIAW H. CHOO T. A. SALEH D. W. BROWN M. R. DAYMOND X. L. WANG A. D. STOICA E. C. OLIVER D. L. KLARSTROM Department of Materials Science and Engineering University of Tennessee Knoxville TN 37996 USA Metals and Ceramics Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA Los Alamos neutron Science Center Los Alamos National Laboratory Los Alamos NM 87545 USA Department of Mechanical and Materials Engineering Queen＇s University Kingston ON K7L3N6 Canada Spallation neutron source Oak Ridge National Laboratory Oak Ridge TN 37831 USA isis pulsed neutron and muon source Rutherford-Appleton Laboratory Chilton Didcot OX 11 0QX UK Haynes International Inc Kokomo IN 46904 USA

ULTIMET® alloy is a cobalt-based superalloy that undergoes a deformation-induced phase transformation from a face-centered-cubic (fcc) phase to a hexagonal-close-packed (hcp) phase. The transformation was studied during monotonic loading, stress-controlled high-cycle fatigue (HCF) and strain-controlled low-cycle fatigue (LCF). The HCF was performed at a maximum stress of σmax=840 MPa and a minimum stress of σmin=84 MPa, while the tensile experiment was terminated after reaching σmax=890 MPa. The LCF was performed at a maximum strain of σmax=1.25% and a minimum strain of σmin=-1.25%. The monotonic-loading experiment results reveal that the hcp phase forms after reaching the yield stress. During HCF, the hexagonal phase forms immediately upon the first fatigue cycle, with no further change in structure upon subsequent deformation. In contrast to HCF, the hcp phase forms gradually during LCF. In fact, fatigue cycle 12 is reached before the hcp phase is resolved by neutron diffraction. Diffraction patterns from subsequent fatigue cycles reveal that the hcp phase continues to accumulate as LCF progresses. These observations can be related to the input of mechanical energy during different loading modes.

关键词：钴基高温合金现场加载中子衍射 fcc hcp 相变

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Versatile domain mapping of scanning electron nanobeam diffraction datasets utilising variational autoencoders

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npj Computational Materials 2023年第1期9卷 2213-2230页

作者： A.Bridger W.I.F.David T.J.Wood M.Danaie K.T.Butler Inorganic Chemistry Laboratory University of OxfordOxford OX13QRUK isis neutron and muon Spallation source STFC Rutherford Appleton LaboratoryOxfordshire OX110QXUK Electron Physical Science Imaging Centre Diamond Light Source Ltd.DidcotUK School of Engineering and Materials Science Queen Mary University of LondonMile End RoadLondon E14NSUK

Characterisation of structure across the nanometre scale is key to bridging the gap between the local atomic environment and macro-scale and can be achieved by means of scanning electron nanobeam diffraction(SEND).As a technique,SEND allows for a broad range of samples,due to being relatively tolerant of specimen thickness with low electron ***,coupled with the capacity for automation of data collection over wide areas,allows for statistically representative probing of the *** paper outlines a versatile,data-driven approach for producing domain maps,and a statistical approach for assessing their *** workflow utilises a Variational AutoEncoder to identify the sources of variance in the diffraction signal,and this,in combination with clustering techniques,is used to produce domain *** approach is agnostic to domain crystallinity,requires no prior knowledge of crystal structure,and does not require simulation of a library of expected diffraction patterns.

关键词： mapping beam dosage

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Superconducting Properties and Absence of Time Reversal Symmetry Breaking in the Noncentrosymmetric Superconducting Compounds Ta_(x)Re_(1-x)(0.1≤x≤0.25)

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Chinese Physics Letters 2021年第1期38卷 110-115页

作者： Chun-Qiang Xu Yi Liu Wei Zhou Jia-Jia Feng Sen-Wei Liu Yu-Xing Zhou Hao-Bo Wang Zhi-Da Han Bin Qian Xue-Fan Jiang Xiao-Feng Xu Wei Ye Zhi-Xiang Shi Xiang-Lin Ke Pabitra-Kumar Biswas School of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast UniversityNanjing 211189China Department of Applied Physics Zhejiang University of TechnologyHangzhou 310023China School of Electronic and Information Engineering Changshu Institute of TechnologyChangshu 215500China Department of Physics Zhejiang UniversityHangzhou 310007China Department of Physics and Astronomy Michigan State UniversityEast LansingMichigan 48824-2320USA isis pulsed neutron and muon source STFC Rutherford Appleton LaboratoryHarwell CampusDidcotOxfordshire OX110QXUnited Kingdom

Unconventional superconductivity,in particular,in noncentrosymmetric systems,has been a long-sought topic in condensed matter ***,Re-based superconductors have attracted great attention owing to the potential time-reversal symmetry breaking in their superconducting *** report the superconducting properties of noncentrosymmetric compounds Ta_(x)Re_(1-x) with 0.1 ≤x≤0.25,and find that the superconducting transition temperature reaches a maximum of ~8 K at the optimal level x=***,muon-spin rotation and relaxation measurements reveal no time-reversal symmetry breaking existing in its superconducting state,which is in sharp contrast to both centrosymmetric Re metal and many other noncentrosymmetric Re-based superconductors.

关键词： breaking symmetric (x)

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Frustrated Magnetic Interactions and Quenched Spin Fluctuations in CrAs

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Chinese Physics Letters 2022年第12期39卷 89-93页

作者： Yayuan Qin Yao Shen Yiqing Hao Hongliang Wo Shoudong Shen Russell A.Ewings Yang Zhao Leland W.Harriger Jeffrey W.Lynn Jun Zhao State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433China Shanghai Qizhi Institute Shanghai 200232China isis pulsed neutron and muon source STFC Rutherford Appleton LaboratoryHarwell CampusDidcotOxonOX110QXUnited Kingdom NIST Center for neutron Research National Institute of Standards and TechnologyGaithersburgMD 20899USA Department of Materials Science and Engineering University of MarylandCollege ParkMD 20742USA Institute of Nanoelectronics and Quantum Computing Fudan UniversityShanghai 200433China Shanghai Research Center for Quantum Sciences Shanghai 201315China

The discovery of pressure-induced superconductivity in helimagnets(CrAs,MnP)has attracted considerable interest in understanding the relationship between complex magnetism and unconventional ***,the nature of the magnetism and magnetic interactions that drive the unusual double-helical magnetic order in these materials remains ***,we report neutron scattering measurements of magnetic excitations in CrAs single crystals at ambient *** experiments reveal well defined spin wave excitations up to about 150 meV with a pseudogap below 7 meV,which can be effectively described by the Heisenberg model with nearest neighbor exchange *** surprisingly,the spin excitations are largely quenched above the Néel temperature,in contrast to cuprates and iron pnictides where the spectral weight is mostly preserved in the paramagnetic *** results suggest that the helimagnetic order is driven by strongly frustrated exchange interactions,and that CrAs is at the verge of itinerant and correlation-induced localized states,which is therefore highly pressure-tunable and favorable for superconductivity.

关键词： excitation exchange pressure

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Numerical Approach of a Coupled Pressure-Saturation Model Describing Oil-Water Flow in Porous Media

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Communications on Applied Mathematics and Computation 2023年第2期5卷 946-964页

作者： Paula Luna Arturo Hidalgo isis neutron and muon source Rutherford Appleton LaboratoryDidcot OX110QXUK Departamento de Ingeniería Geológica y Minera Escuela Técnica Superior de Ingenieros de Minas y EnergíaCenter for Computational SimulationUniversidad Politécnica de MadridRíos Rosas2128003 MadridSpain

Two-phase flow in porous media is a very active field of research,due to its important applications in groundwater pollution,CO_(2)sequestration,or oil and gas production from petroleum reservoirs,just to name a few of *** flow equations,which make use of Darcy's law,for describing the movement of two immiscible fluids in a porous medium,are among the most relevant mathematical models in reservoir *** work aims to solve a fractional flow model formed by an elliptic equation,representing the spatial distribution of the pressure,and a hyperbolic equation describing the space-time evolution of water *** numerical solution of the elliptic part is obtained using a finite-element(FE)scheme,while the hyperbolic equation is solved by means of two dif-ferent numerical approaches,both in the finite-volume(FV)*** is based on a monotonic upstream-centered scheme for conservation laws(MUSCL)-Hancock scheme,whereas the other makes use of a weighted essentially non-oscillatory(ENO)*** both cases,a first-order centered(FORCE)-αnumerical scheme is applied for inter-cell flux reconstruction,which constitutes a new contribution in the field of fractional flow models describing oil-water movement.A relevant feature of this work is the study of the effect of the parameterαon the numerical solution of the models *** also show that,in the FORCE-αmethod,when the parameterαincreases,the errors diminish and the order of accuracy is more properly attained,as verified using a manufactured solution technique.

关键词： Two-phase flow Reservoir simulation Porous media FORCE-α Finite volume

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Magnetic and superconducting phase diagrams and transition temperatures predicted using text mining and machine learning

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npj Computational Materials 2020年第1期6卷 1521-1529页

作者： Callum J.Court Jacqueline M.Cole Cavendish Laboratory Department of PhysicsUniversity of CambridgeJ.J.Thomson AvenueCambridge CB30HEUK isis neutron and muon source STFC Rutherford Appleton LaboratoryHarwell Science and Innovation CampusDidcotOxfordshire OX110QXUK Argonne National Laboratory 9700 South Cass AvenueArgonneIL 60439USA Department of Chemical Engineering and Biotechnology University of CambridgeWest Cambridge SitePhilippa Fawcett DriveCambridge CB30FSUK

Predicting the properties of materials prior to their synthesis is of great importance in materials *** and superconducting materials exhibit a number of unique properties that make them useful in a wide variety of applications,including solid oxide fuel cells,solid-state refrigerants,photon detectors and metrology *** all these applications,phase transitions play an important role in determining the feasibility of the materials in ***,we present a pipeline for fully integrating data extracted from the scientific literature into machine-learning tools for property prediction and materials *** advanced natural language processing(NLP)and machine-learning techniques,we successfully reconstruct the phase diagrams of well-known magnetic and superconducting compounds,and demonstrate that it is possible to predict the phase-transition temperatures of compounds not present in the *** provide the tool as an online open-source platform,forming the basis for further research into magnetic and superconducting materials discovery for potential device applications.

关键词： phase transition superconducting

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Fluctuating magnetic droplets immersed in a sea of quantum spin liquid

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The Innovation 2023年第5期4卷 33-40页

作者： Zihao Zhu Binglin Pan Linpeng Nie Jiamin Ni Yanxing Yang Changsheng Chen Chengyu Jiang Yeyu Huang Erjian Cheng Yunjie Yu Jianjian Miao Adrian D.Hilier Xianhui Chen Tao Wu Yi Zhou Shiyan Li Lei Shu State Key Laboratory of Surface Phys ics and Department of PhysicsFudan UniversityShanghai 200433China CAS Key Laboratory of Stronglycoupled Quantum Matter Physics Department of PhysicsUniversity of Science and Technology of ChinaHefeiAnhui 230026China Department of Physics the University of Hong KongHong KongChina isis pulsed neutron and muon source STFC Rutherford Appleton LaboratoryHarwell CampusDidcotOxfordshire 0X110QXUK Collaborative Innovation Center of Advanced Micr ostructures Nanjing 210093China CAS Center for Excellence in Superconducting Electronics(CENSE) Shanghai 200050China Institute of Physics and Beijing National Laboratory for Condensed Matter Physics Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory DongguanGuangdong 523808China Kavli Institute for Theoretical Sciences and CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Shanghai Research Center for Quantum Sciences Shanghai 201315China

The search of quantum spin liquid(QSL),an exotic magnetic state with strongly fluctuating and highly entangled spins down to zero temperature,is a main theme in current condensed matter ***,there is no smoking gun evidence for deconfined spinons in any QSL candidate so *** disorders and competing exchange interactions may prevent the formation of an ideal QSL state on frustrated spin *** we report comprehensive and systematic measurements of the magnetic susceptibility,ultralow-temperature specific heat,muon spin relaxation(μSR),nuclear magnetic resonance(NMR),and thermal conductivity for NaYbSe2 single crystals,in which Yb3+ions with effective spin-1/2 form a perfect triangular *** these complementary techniques find no evidence of long-range magnetic order down to their respective base ***,specific heat,μSR,and NMR measurements suggest the coexistence of quasi-static and dynamic spins in *** scattering from these quasi-static spins may cause the absence of magnetic thermal ***,we propose a scenario of fluctuating ferrimagnetic droplets immersed in a sea of *** may be quite common on the way pursuing an ideal QSL,and provides a brand new platform to study how a QSL state survives impurities and coexists with other magnetically ordered states.

关键词： NMR immersed quantum

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Erratum:Frustrated Magnetic Interactions and Quenched Spin Fluctuations in CrAs[***.39,127501(2022)]

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Chinese Physics Letters 2023年第2期40卷 69-69页

作者： Yayuan Qin Yao Shen Yiqing Hao Hongliang Wo Shoudong Shen Russell A. Ewings Yang Zhao Leland W. Harriger Jeffrey W. Lynn Jun Zhao State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China Shanghai Qizhi Institute Shanghai 200232 China isis pulsed neutron and muon source STFC Rutherford Appleton Laboratory Harwell Campus Didcot Oxon OX11 0QX United Kingdom NIST Center for neutron Research National Institute of Standards and Technology Gaithersburg MD 20899 USA Department of Materials Science and Engineering University of Maryland College Park MD 20742 USA Institute of Nanoelectronics and Quantum Computing Fudan University Shanghai 200433 China Shanghai Research Center for Quantum Sciences Shanghai 201315 China

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Expanding the Frontiers of neutron Scattering: Twenty Years of Progress at isis

Expanding the Frontiers of Neutron Scattering: Twenty Years ...

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第三届散裂中子源多学科应用研讨会

作者： Andrew Taylor isis UK

＜正＞Activity at the isis Facility, currently the world’s most successful pulsed neutron and muon source, is described and plans for its ongoing development given. In particular, progress on the isis Second Target

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Kinetic energy and radial momentum distribution of hydrogen and oxygen atoms of water confined in silica hydrogel in the temperature interval 170-325 K

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Science China(Physics,Mechanics & Astronomy) 2019年第10期62卷 87-90页

作者： Vincenzo De Michele Giovanni Romanelli Antonio Cupane Dipartimento di Fisica e Chimica Universita di PalermoPalermo 90128Italy isis Facility Rutherford Appleton LaboratoryOxfordshire OX11 0QXUK

Water is an ubiquitous liquid and it is necessary for life;studies on water are therefore of obvious scientific and technological *** view of its peculiar physical properties(the so-called water anomalies,particularly relevant at low temperatures[1]),studies on water structure and dynamics in ample temperature intervals,covering also the supercooling region,have attracted much interest in recent *** particular,studies focused on the supercooled phase are important in order to test theories and hypotheses[2,3],including the liquid-liquid phase transition hypothesis[4-6]and the related fragile-to-strong crossover observed in water confined in silica matrices and in the hydration water of proteins[7,8].In this context,water confined within nanometer-sized porous hydrophilic/hydrophobic matrices has been investigated both to extend the supercooling temperature range accessible to experiment and to mimic the crowding/confined conditions experienced by water molecules in biological systems relevant to biophysics,bio-preservation,and *** view of the above arguments,studies on the short-time dynamics of hydrogen and oxygen atoms of supercooled water(bulk or confined)are of great relevance.

关键词： confined silica matrices

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