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Unveiling anneal hardening in dilute Al-doped Al_(x)CoCrFeMnNi(x = 0,0.1) high-entropy alloys

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Journal of Materials Science & Technology 2021年第32期91卷 270-277页

作者： q.Cheng x.D.xu P.xie L.L.Han J.Y.He x.q.li J.Zhang Z.T.li Y.P.li B.liu T.G.Nieh M.W.Chen J.H.Chen Centre for High Resolution Electron Microscopy College of Materials Science and EngineeringHunan UniversityChangsha 410082China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Applied Materials Physics Department of Materials Science and EngineeringKTH-Royal Institute of TechnologyStockholm SE10044Sweden Department of Materials Science and Engineering University of TennesseeKnoxvilleTN37996United States Department of Materials Science and Engineering Johns Hopkins UniversityBaltimoreMD 21214USA

Anneal hardening has been one of the approaches to improve mechanical properties of solid solution alloys with the face-centered cubic(FCC) structure,whereby a considerable strengthening can be attained by annealing of cold-worked alloys below the recrystallization temperature(T_(rx)).Microscopically,this hardening effect has been ascribed to several mechanisms,*** segregation to defects(dislocation and stacking fault) and short-range chemical ordering,***,none of these mechanisms can well explain the anneal hardening recently observed in phase-pure and coarse-grained FCC-structured high-entropy alloys(HEAs).Here we report the observations,using high-resolution electron channeling contrast imaging and transmission electron microscopy,of profuse and stable dislocation substructures in a cold-rolled CoCrFeMnNi HEA subject to an annealing below T_(rx).The dislocation substructures are observed to be thermally stable up to T_(rx),which could arise from the chemical complexity of the high-entropy system where certain elemental diffusion retardation *** microstructure feature is markedly different from that of conventional dilute solid solution alloys,in which dislocation substructures gradually vanish by recovery during annealing,leading to a strength ***,dilute addition of 2 at.% Al leads to a reduction in both microhardness and yield strength of the cold-rolled and subsequently annealed(≤500℃) *** Al induced softening effect,could be associated with the anisotropic formation of dislocation substructure,resulting from enhanced dislocation planar slip due to glide plane softening *** findings suggest that the strength of HEAs can be tailored through the anneal hardening effect from dislocation substructure strengthening.

关键词： Annealing hardening Dislocation substructure strengthening High-entropy alloy Solid solution structure

The high-energy particle package onboard CSES

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Radiation Detection Technology and Methods 2019年第3期3卷 45-55页

作者： x.q.li Y.B.xu Z.H.An x.H.liang P.Wang x.Y.Zhao H.Y.Wang H.Lu Y.q.Ma x.H.Shen x.Y.Wen H.Wang D.L.Zhang F.Shi W.x.Peng M.Gao x.x.Yu J.Z.Wang Y.J.Zhang J.L.Zhang J.Zhang H.x.li J.R.Zeng Y.F.Nan Institute of High Energy Physics CASBeijing 100049China Institute of Crustal Dynamics CEABeijing 100085China Nanchang Hangkong University Nanchang 330063China Northwest University Xi’an 710127China

Introduction The China Seismo-Electromagnetic Satellite(CSES)aims to monitor space electromagnetic fields,ionospheric plasma,high-energy charged particles and other features of the global space *** high-energy particle package(HEPP),which can effectively detect the energy spectrum,flux and pitch angle distribution of space electrons and protons,and soft x-ray emission from solar flares,is one of the main payloads of *** and methods In this study,we designed,developed and calibrated the high-energy particle package and launched it into orbit with *** consists of the high-energy detector(HEPP-H),the low-energy detector(HEPP-L),and the solar x-ray monitor(HEPP-x).The three sub-detectors mainly use silicon detector and crystal calorimeter detection *** launching,we calibrated the three sub-detectors in detail by using radiation source and accelerator *** All the three sub-detectors have good energy *** launching into orbit,the space energetic particles and x-ray distribution detected by HEPP are consistent with *** performance indices of the detector reach the advanced level of the same kind of detector in the *** HEPP has a wide energy detection range,good energy resolution and high angular resolution ability for electrons and *** will play an important role in the study of space particle response and space physics of seismic activity.

关键词： ZH-1 CSES HEPP High-energy particle Radiation belt

The design and performance of charged particle detector onboard the GECAM mission

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Radiation Detection Technology and Methods 2022年第1期6卷 53-62页

作者： Y.B.xu x.q.li x.L.Sun S.Yang H.Wang W.x.Peng x.H.liang K.Gong Y.q.liu D.Y.Guo x.Y.Zhao C.Y.li Z.H.An J.J.He x.J.liu x.Y.Wen S.L.xiong Fan Zhang D.L.Zhang C.Y.Zhang C.Cai Z.Chang G.Chen C.Chen Y.Y.Du M.Gao R.Gao D.J.Hou Y.G.li G.li L.li x.F.li M.S.li F.J.Lu H.Lu B.Meng F.Shi J.Z.Wang Y.S.Wang H.Z.Wang x.Wen S.xiao Y.P.xu J.W.Yang q.B.Yi S.N.Zhang C.M.Zhang F.Zhang Y.Zhao x.Zhou Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

Background The Gravitational wave highly energetic Electromagnetic Counterpart All-sky Monitor(GECAM)is dedicated to detecting gravitational wave gamma-ray *** is capable of all-sky monitoring over and discovering gamma-ray bursts and new radiation *** consists of two microsatellites,each equipped with 8 charged particle detectors(CPDs)and 25 gamma-ray detectors(GRDs).Purpose The CPD is used to measure charged particles in the space environment,monitor energy and flow intensity changes,and identify between gamma-ray bursts and space charged particle events in conjunction with *** CPD uses plastic scintillator as the sensitive material for detection,silicon photomultiplier array as the optically readable device,and the inlaid Am-241 radioactive source as the onboard calibration *** In this paper,we will present the working principle,physical design,functional implementation and preliminary performance test results of the *** a result,the energy range of electron,gamma-ray detection efficiency and dead time are tested to be better than the indexes required through the ground calibration experiment.

关键词： GECAM CPD SiPM

The data acquisition algorithm designed for the SiPM-based detectors of GECAM satellite

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Radiation Detection Technology and Methods 2022年第1期6卷 70-77页

作者： Y.q.liu K.Gong x.q.li x.Y.Wen Z.H.An C.Cai Z.Chang G.Chen C.Chen Y.Y.Du M.Gao R.Gao D.Y.Guo J.J.He D.J.Hou Y.G.li C.Y.li G.li L.li x.F.li M.S.li x.H.liang x.J.liu F.J.Lu H.Lu B.Meng W.x.Peng F.Shi x.L.Sun H.Wang J.Z.Wang Y.S.Wang H.Z.Wang x.Wen S.xiao S.L.xiong Y.B.xu Y.P.xu S.Yang J.W.Yang q.B.Yi Fan Zhang D.L.Zhang S.N.Zhang C.Y.Zhang C.M.Zhang Fei Zhang x.Y.Zhao Y.Zhao x.Zhou Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Physics and Space Science College China West Normal UniversityNanchong 637002China

Background The Gravitational Wave High-energy Electromagnetic Counterpart All-sky Monitor(GECAM)consists of 2 microsatellites,each of which contains 25 GRD(LaBr3)detectors and 8 CPD(plastic scintillator)*** silicon photomultiplier(SiPM)array is used to read each *** output signal of these detectors with SiPM array is very special and challenging to *** this study,a novel data acquisition(DAq)algorithm for these detectors is designed and implemented,and the content of the output event packet is *** and Conclusion The performances,including the event acquisition efficiency of this DAq algorithm,are extensively verified through experimental *** the on-ground and in-flight tests,this algorithm has excellent performance despite the very limited resources and short development time of GECAM mission.

关键词： Silicon photomultiplier Digital waveform processing Data acquisition

A NEW TEST METHOD FOR FRP-TO-CONCRETE BOND BEHAVIOUR UNDER IMPACT LOADING

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The design and performance of GRD onboard the GECAM satellite

The Twelfth International Symposium on Structural Engineering

作者： J.F.Chen x.q.li Y.Lu I.M.May T.J.Stratford R.O'Sullivan A.Sheil School of the Built Environment Heriot Watt UniversityEdinburghUK

ISBN: (纸本)9787030357878

External bonding of fibre reinforced polymer(FRP) composites has become a popular technique worldwide for strengthening reinforced concrete(RC) structures since *** of the technique have been typically for static loading and seismic retrofitting,but many studies on strengthening concrete and masonry structures with externally bonded FRP for improved blast and impact resistance in protective engineering have also been *** bond behaviour between FRP and concrete plays a critical role in a strengthening system with externally bonded *** to the dynamic characteristics of blast and impact loading,the bond behaviour between FRP and concrete under such loading could be very different from that under static *** paper presents a prelimnary study using a new test method for examining this bond behaviour under impact *** main test results of the first batch of specimens are reported.

关键词： FRP-to-Concrete bond impact loading

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Radiation Detection Technology and Methods 2022年第1期6卷 43-52页

作者： Z.H.An x.L.Sun D.L.Zhang S.Yang x.q.li x.Y.Wen K.Gong x.H.liang x.J.liu Y.q.liu Y.G.li S.L.xiong Y.B.xu Fan Zhang x.Y.Zhao C.Cai Z.Chang G.Chen C.Chen Y.Y.Du P.Y.Feng M.Gao R.Gao D.Y.Guo J.J.He D.J.Hou C.Y.li G.li L.li x.F.li M.S.li F.J.Lu H.Lu B.Meng W.x.Peng F.Shi H.Wang J.Z.Wang Y.S.Wang H.Z.Wang x.Wen S.xiao Y.P.xu J.W.Yang q.B.Yi S.N.Zhang C.Y.Zhang C.M.Zhang Fei Zhang Y.Zhao x.Zhou CAS Institute of High Energy PhysicsBeijing 100049China State Key Laboratory of Particle Detection and Electronics Beijing 100049China 3 Xiangtan UniversityXiangtan 411105China 4 Beijing Normal UniversityBeijing 110875China xiangtan University Xiangtan 411105China Beijing Normal University Beijing 110875China

Background Each GECAM satellite payload contains 25 gamma-ray detectors(GRDs),which can detect gamma-rays and particles and can roughly localize the Gamma-Ray Bursts(GRBs).GRD was designed using lanthanum bromide(LaBr3)crystal as the sensitive material with the rear end coupled with silicon photomultiplier(SiPM)array for *** In aerospace engineering design of GRD,there are many key points to be *** this paper,we present the specific design scheme of GRD,the assembly and the performance test results of *** Based on Monte Carlo simulation and experimental test results,the specific schematic design and assembling process of GRD were *** being fully assembled,the GRDs were conducted performance tests by using radioactive source and also conducted random vibration *** and conclusion The test results show that all satellite-borne GRDs have energy resolutionquirements of satellite in scientific *** random vibration test shows that GRD can maintain in a stable performance,which meets the requirement of spatial application.

关键词： Lanthanum bromide scintillator SiPM array GECAM Gamma-ray detector Energy resolution

Dedicated SiPM array for GRD of GECAM

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Radiation Detection Technology and Methods 2022年第1期6卷 63-69页

作者： D.L.Zhang x.L.Sun Z.H.An x.q.li x.Y.Wen K.Gong C.Cai Z.Chang G.Chen C.Chen Y.Y.Du M.Gao R.Gao D.Y.Guo J.J.He D.J.Hou Y.G.li C.Y.li G.li L.li x.F.li M.S.li x.H.liang x.J.liu Y.q.liu F.J.Lu H.Lu B.Meng W.x.Peng F.Shi H.Wang J.Z.Wang Y.S.Wang H.Z.Wang x.Wen S.xiao S.L.xiong Y.B.xu Y.P.xu S.Yang1 x.Zhou J.W.Yang Fan Zhang S.N.Zhang C.Y.Zhang C.M.Zhang Fei Zhang x.Y.Zhao Institute of High Energy Physics CASBeijing 100049China State Key Laboratory of Particle Detection and Electronics Beijing 100049China

Purpose The discovery of gravitational waves and gamma-ray bursts heralds the era of multi-messenger *** the adoption of two small satellites to achieve the all-sky monitoring of gamma-ray bursts,the gravitational wave highenergy electromagnetic counterpart all-sky monitor(GECAM)possesses a quasi-real-time early warning ability and plays an important role in positioning the sources of gravitational waves and in subsequent *** satellite of GECAM was fitted with 253-inch-diameter gamma-ray detectors(GRD),covering an energy range of 8–2 *** have adopted silicon photomultiplier tubes(SiPM)in lieu of photomultiplier tubes(PMT)to adapt to the dimensional limitations of *** A unique 3-inch circular SiPM array was *** this design,646×6 mm chips were arranged evenly in a circular manner with the seams filled with reflecting films,thus achieving satisfactory uniformity of light *** integrated pre-amplifier circuit on the back of the SiPM array adopted two-level grouping and summing;further,it achieved a satisfactory signal-to-noise *** high-gain and low-gain channels were adopted to achieve a large dynamic range,and two independent power supply units were used,where each unit can be closed separately,thus improving *** Performance studies show that this SiPM array meets the requirements of *** A 3-inch SiPM array have been developed that uses grouped summation,reflective films,a circular arrangement,two groups of independent power supplies,high-and low-gain signals,differential signal output technologies,*** solution can be used not only for GECAM,but also as a general solution for SiPM-based scintillation detectors.

关键词： SiPM GECAM Gamma-ray Signal-to-noise ratio Reflecting film Pre-amplifier

quality assurance test and failure analysis of SiPM arrays of GECAM satellites

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Radiation Detection Technology and Methods 2022年第1期6卷 35-42页

作者： D.L.Zhang M.Gao x.L.Sun x.q.li Z.H.An x.Y.Wen C.Cai Z.Chang G.Chen C.Chen Y.Y.Du R.Gao K.Gong D.Y.Guo J.J.He D.J.Hou Y.G.li C.Y.li G.li L.li x.F.li M.S.li x.H.liang x.J.liu Y.q.liu F.J.Lu H.Lu B.Meng W.x.Peng F.Shi H.Wang J.Z.Wang Y.S.Wang H.Z.Wang x.Wen S.xiao S.L.xiong Y.B.xu Y.P.xu S.Yang J.W.Yang Fan.Zhang S.N.Zhang C.Y.Zhang C.M.Zhang Fei Zhang x.Y.Zhao x.Zhou Institute of High Energy Physics CASBeijing 100049People’s Republic of China

Background The Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM)satellite developed a SiPM-based gamma-ray detector to monitor the gravitational wave-related GRBs and guide subsequent observations in other wavelengths of *** As all the available SiPM devices belong to commercial grade,quality assurance tests need to be performed in accordance with the aerospace *** In the SiPM application of GECAM,quality assurance experiments were *** mechanism of the failure of SiPM devices was analyzed during the development *** Based on the quality assurance test results,the fnal pass rate of SiPM array was 95%.Based on the failure analysis,it was found that a piece of SiPM had a leakage channel after longtime operation due to device *** According to the accumulated experience,in the reliability test of SiPM,it is necessary to pay special attention to test the impedance of each pin of SiPM to ground and confrm that the power switch state of SiPM is controllable.

关键词： Gravitational waves Gamma-ray detectors Silicon photomultipliers quality assurance test Failure analysis

The technology for detection of gamma-ray burst with GECAM satellite

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Radiation Detection Technology and Methods 2022年第1期6卷 12-25页

作者： x.q.li x.Y.Wen Z.H.An C.Cai Z.Chang G.Chen C.Chen Y.Y.Du M.Gao R.Gao K.Gong D.Y.Guo J.J.He D.J.Hou Y.G.li C.Y.li G.li L.li x.F.li M.S.li x.H.liang x.J.liu Y.q.liu F.J.Lu H.Lu B.Meng W.x.Peng F.Shi x.L.Sun H.Wang J.Z.Wang Y.S.Wang H.Z.Wang x.Wen S.xiao S.L.xiong Y.B.xu Y.P.xu S.Yang J.W.Yang q.B.Yi D.L.Zhang Fan Zhang S.N.Zhang C.Y.Zhang C.M.Zhang Fei Zhang x.Y.Zhao Y.Zhao x.Zhou C.S.Zhang J.P.Yu L.Chang K.K.Zhang J.Huang Y.M.Chen x.B.Han Institute of High Energy Physics CASBeijing 100049China xiangtan University Xiangtan 411105China Beijing Normal University Beijing 110875China Beijing Glass Research Institute Beijing 101100China Innovation Academy for Microsatellites of CAS Shanghai 201204China

Introduction The main physical objective of the GECAM satellite is to detect gamma-ray bursts,which is related to gravitational waves of double compact object *** GECAM satellite also detects and investigates various bursts of high-energy celestial *** and methods In this study,we designed,developed and calibrated the payload and launched it into orbit with GECAM *** payload consists of the gamma ray detector(GRD,for detecting 4 keV–4 MeV x/γray),the charged particle detector(CPD,for detecting 150 keV–5 MeV charged particle),and the electronic box(EBOx).The all-sky field coverage is achieved via two 229-degree large-area satellites positioned 180 degrees apart and are on opposite sides of the *** satellite is equipped with 25 GRDs and 8 CPDs;thus,the satellite can identify charged particle bursts in ***-ray detectors adopt lanthanum bromide crystal technology combined with silicon *** is the first time that this technology was used massively in space *** The GECAM satellite can quickly determine the direction of gamma-ray bursts(positioning)via indexing and fitting method,while the transmit variability,energy spectrum and direction of the gamma-ray bursts guide subsequent observations through the Beidou-3 RDSS in quasi-real *** will play an important role in the study of high energy celestial bursts.

关键词： GECAM Gamma-ray burst Lanthanum bromide crystal Silicon photomultiplier Beidou short message