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Advances in additively manufactured titanium alloys by powder bed fusion and directed energy deposition:Microstructure,defects,and mechanical behavior

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journal of Materials Science & Technology 2024年第16期183卷 32-62页

作者： H.Y.Ma j.c.wang P.Qin Y.j.Liu L.Y.chen L.Q.wang L.c.Zhang centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA 6027SA School of Engineering M050The University of Western Australia35 Stirling HighwayCrawleyPerthWA 6009SA Institute of Metals College of Material Science and EngineeringChangsha University of Science&TechnologyChangsha 410004China School of Material Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China State Key Laboratory of Metal Matrix composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Ti and its alloys have been broadly adopted across various industries owing to their outstanding proper-ties,such as high strength-to-weight ratio,excellent fatigue performance,exceptional corrosion resistance and so *** manufacturing(AM)is a complement to,rather than a replacement for,traditional manufacturing *** enhances flexibility in fabricating complex components and resolves machin-ing challenges,resulting in reduced lead times for custom ***,owing to distinctions among various AM technologies,Ti alloys fabricated by different AM methods usually present differences in mi-crostructure and defects,which can significantly influence the mechanical performance of built ***,having an in-depth knowledge of the scientific aspects of fabrication and material properties is crucial to achieving high-performance Ti alloys through different AM *** article reviews the mechanical properties of Ti alloys fabricated by two mainstream powder-type AM techniques:powder bed fusion(PBF)and directed energy deposition(DED).The review examines several key aspects,en-compassing phase formation,grain size and morphology,and defects,and provides an in-depth analysis of their influence on the mechanical behaviors of Ti *** review can aid researchers and engi-neers in selecting appropriate PBF or DED methods and optimizing their process parameters to fabricate high-performance Ti alloys for a wide range of industrial applications.

关键词： Powder bed fusion Directed energy deposition Titanium alloys Phase transformation Defects Mechanical property

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comparison of microstructure and mechanical behavior of Ti-35Nb manufactured by laser powder bed fusion from elemental powder mixture and prealloyed powder

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journal of Materials Science & Technology 2022年第10期105卷 1-16页

作者： j.c.wang Y.j.Liu S.X.Liang Y.S.Zhang L.Q.wang T.B.Sercombe L.c.Zhang School of Engineering Edith Cowan University270 Joondalup DriveJoondalupPerthWA 6027Australia School of Engineering M050The University of Western Australia35 Stirling HighwayCrawleyPerthWA 6009Australia Northwest Institute for Nonferrous Metal Research Xi’an 710016China State Key Laboratory of Metal Matrix composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Although different types of powder feedstock are used for additive manufacturing via laser powder bed fusion(L-PBF),limited work has attempted to directly compare the microstructure and mechanical behavior of components manufactured from those powder *** work investigated the microstructure,phase composition,melt pool morphology,and mechanical properties of a prealloyed Ti-35Nb alloy manufactured using L-PBF and compared these to their counterparts produced from elemental powder *** samples manufactured from the powder mixture are composed of randomly distributed undissolved Nb in theα/βmatrix,resulting from the unstable melt pool during the melting of the powder *** contrast,parts produced from prealloyed powder display a homogeneous microstructure withβandαphases,owing to the full melting of prealloyed powder,therefore,a more stable melt pool to achieve a homogeneous *** Ti-35Nb manufactured from prealloyed powder exhibits large tensile ductility(about 10 times that of the counterparts using mixed powder),attributed to the high homogeneity in microstructure and chemical composition,strong interface bonding,relatively low oxygen content,and the existence of a large amount ofβ*** work sheds insights into understanding the effect of powder feedstock on the melt pool stability therefore the microstructure and mechanical behavior of the resultant parts.

关键词： Titanium-niobium Powder bed fusion Additive manufacturing Melt pool stability Microstructure Mechanical properties

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INFLUENcE OF ZIRcONIUM ON MIcROSTRUcTURE AND DAMPING cAPAcITY OF ZA27 ALLOY

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Acta Metallurgica Sinica(English Letters) 1998年第3期11卷 230-234页

作者： j.c.wang Z.M.Zhang Y.L.Lu G.S.Song G.c.Yang Northwestern Polytechnical Univ Xi'an China

To improve the damping capacities of metals and alloys, the microstructures and damping capacities of ZA27 alloy modified by Zr were studied, and the damping capacities at room tempemture were measured by using cantilever beam techniques. The experiment results show that Zr can refine the Al-rich primary phase and improve the damping capacities saliently. compared with the un-modified one, the damping capacity of ZA27 alloy modified by 0.3wt%Zr received 90 percent increment. The high damping capacities are attributed primarily to grain ablement and the increasing of phase interfaces.

关键词： ZA27 alloy damping capacity modification microstructure

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LHAASO detection of very-high-energy γ-ray emission surrounding PSR j0248+6021

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Science china(Physics,Mechanics & Astronomy) 2025年

作者： Zhen cao F.Aharonian Axikegu Y.X.Bai Y.W.Bao D.Bastieri X.j.Bi Y.j.Bi W.Bian A.V.Bukevich Q.cao W.Y.cao Zhe cao j.chang j.F.chang A.M.chen E.S.chen H.X.chen Liang chen Lin chen Long chen M.j.chen M.L.chen Q.H.chen S.chen S.H.chen S.Z.chen T.L.chen Y.chen N.cheng Y.D.cheng M.c.chu M.Y.cui S.W.cui X.H.cui Y.D.cui B.Z.Dai H.L.Dai Z.G.Dai Danzengluobu X.Q.Dong K.K.Duan j.H.Fan Y.Z.Fan j.Fang j.H.Fang K.Fang c.F.Feng H.Feng L.Feng S.H.Feng X.T.Feng Y.Feng Y.L.Feng S.Gabici B.Gao c.D.Gao Q.Gao W.Gao W.K.Gao M.M.Ge T.T.Ge L.S.Geng G.Giacinti G.H.Gong Q.B.Gou M.H.Gu F.L.Guo j.Guo X.L.Guo Y.Q.Guo Y.Y.Guo Y.A.Han O.A.Hannuksela M.Hasan H.H.He H.N.He j.Y.He Y.He Y.K.Hor B.W.Hou c.Hou X.Hou H.B.Hu Q.Hu S.c.Hu c.Huang D.H.Huang T.Q.Huang W.j.Huang X.T.Huang X.Y.Huang Y.Huang Y.Y.Huang X.L.ji H.Y.jia K.jia H.B.jiang K.jiang X.W.jiang Z.j.jiang M.jin M.M.Kang I.Karpikov D.Khangulyan D.Kuleshov K.Kurinov B.B.Li c.M.Li cheng Li cong Li D.Li F.Li H.B.Li H.c.Li jian Li jie Li K.Li S.D.Li W.L.Li W.L.Li X.R.Li Xin Li Y.Z.Li Zhe Li Zhuo Li E.W.Liang Y.F.Liang S.j.Lin B.Liu c.Liu D.Liu D.B.Liu H.Liu H.D.Liu j.Liu j.L.Liu M.Y.Liu R.Y.Liu S.M.Liu W.Liu Y.Liu Y.N.Liu Q.Luo Y.Luo H.K.Lv B.Q.Ma L.L.Ma X.H.Ma j.R.Mao Z.Min W.Mitthumsiri H.j.Mu Y.c.Nan A.Neronov K.c.Y.Ng L.j.Ou P.Pattarakijwanich Z.Y.Pei j.c.Qi M.Y.Qi B.Q.Qiao j.j.Qin A.Raza D.Ruffolo A.Sáiz M.Saeed D.Semikoz L.Shao O.Shchegolev X.D.Sheng F.W.Shu H.c.Song Yu.V.Stenkin V.Stepanov Y.Su D.X.Sun Q.N.Sun X.N.Sun Z.B.Sun j.Takata P.H.T.Tam Q.W.Tang R.Tang Z.B.Tang W.W.Tian L.H.Wan c.wang c.B.wang G.W.wang H.G.wang H.H.wang j.c.wang Kai wang Kai wang L.P.wang L.Y.wang P.H.wang R.wang W.wang X.G.wang X.Y.wang Y.wang Y.D.wang Y.j.wang Z.H.wang Z.X.wang Zhen wang Zheng wang D.M.Wei j.j.Wei Y.j.Wei T.Wen c.Y.Wu H.R.Wu Q.W.Wu S.Wu X.F.Wu Y.S.Wu S.Q.Xi j.Xia G.M.Xiang D.X.Xiao G.Xiao Y.L.Xin Y.Xing D.R.Xiong Z.Xiong D.L.Xu R.F.Xu R.X.Xu W.L.Xu L.Xue D.H.Yan j.Z.Yan T.Yan c.W.Yang c.Y.Yang F.Yang F.F.Yang L.L.Yang M.j.Yang R.Z.Yang W.X.Yang Y.H.Yao Z.G.Yao L.Q.Yin N.Yin X.H.You Z.Y.You Y.H Southwest jiaotong University School of Astronomy and Space Science Nanjing University center for Astrophysics Guangzhou University Tsung-Dao Lee Institute & School of Physics and Astronomy Shanghai jiao Tong University Institute for Nuclear Research of Russian Academy of Sciences Hebei Normal University University of Science and Technology of china LHAASO collaboration State Key Laboratory of Particle Detection and Electronics Key Laboratory of Dark Matter and Space Astronomy & Key Laboratory of Radio Astronomy Purple Mountain Observatory chinese Academy of Sciences Research center for Astronomical computing Zhejiang Laboratory Key Laboratory for Research in Galaxies and cosmology Shanghai Astronomical Observatory chinese Academy of Sciences School of Physics and Astronomy Key Laboratory of Particle Astrophysics & Experimental Physics Division & computing center Yunnan University Key Laboratory of cosmic Rays (Tibet University) Ministry of Education Department of Physics The chinese University of Hong Kong Key Laboratory of Radio Astronomy and Technology National Astronomical Observatories chinese Academy of Sciences School of Physics and Astronomy (Zhuhai) & School of Physics (Guangzhou) & Sino-French Institute of Nuclear Engineering and Technology (Zhuhai) Sun Yat-sen University Institute of High Energy Physics Institute of Frontier and Interdisciplinary Science Shandong University APc Université Paris cité cNRS/IN2P3 cEA/IRFU Observatoire de Paris Department of Engineering Physics & Department of Astronomy Tsinghua University School of Physics and Microelectronics chinese Academy of Sciences Zhengzhou University Yunnan Observatories chinese Academy of Sciences china center of Advanced Science and Technology college of Physics Sichuan University School of Physics Peking University Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and Technology University of chinese Academy of Sciences Guangxi University Department of Physics Faculty of Science Mahidol University Moscow Institute

We report the detection of an extended very-high-energy(VHE) γ-ray source coincident with the location of middle-aged(62.4 kyr) pulsar PSR j0248+6021, by using the LHAASO-WcDA data of live 796 d and LHAASO-KM2A data of live 1216d. A significant excess of γ-ray induced showers is observed both by WcDA in energy bands of 1-25 Te V and KM2A in energy bands of >25 TeV with 7.3σ and 13.5σ, respectively. The best-fit position derived through WcDA data is R.A. = 42.06°± 0.12°and Dec. = 60.24°± 0.13°with an extension of 0.69°±0.15°and that of the KM2A data is R.A.= 42.29°± 0.13°and Dec. =60.38°± 0.07°with an extension of 0.37°±0.07°. No clear extended multiwavelength counterpart of this LHAASO source has been found from the radio band to the GeV band. The most plausible explanation of the VHE γ-ray emission is the inverse compton process of highly relativistic electrons and positrons injected by the pulsar. These electrons/positrons are hypothesized to be either confined within the pulsar wind nebula or to have already escaped into the interstellar medium, forming a pulsar halo.

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Deep view of composite SNR cTA1 with LHAASO in γ-rays up to 300 TeV

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Science china(Physics,Mechanics & Astronomy) 2025年

The ultra-high-energy（UHE） gamma-ray source 1LHAASO j0007+7303u is positionally associated with the composite SNR cTA1 that is located at high Galactic Latitude b ≈ 10.5°. This provides a rare opportunity to spatially resolve the component of the pulsar wind nebula（PWN） and supernova remnant（SNR） at UHE. This paper conducted a dedicated data analysis of 1LHAASO j0007+7303u using the data collected from December 2019 to july 2023. This source is well detected with significances of 21σ and 17σ at 8-100 TeV and >100 TeV, respectively. The corresponding extensions are determined to be 0.23°±0.03°and 0.17°±0.03°. The emission is proposed to originate from the relativistic electrons accelerated within the PWN of PSR j0007+7303. The energy spectrum is well described by a power-law with an exponential cutoff function dN/dE =（42.4 ± 4.1）(E/（20 TeV）)-2.31±0.11exp(-E/（110±25 TeV）) TeV-1cm-2s-1in the energy range from 8 to 300 TeV, implying a steady-state parent electron spectrum dNe/dEe∝(Ee/（100 TeV）)-3.13±0.16exp[(-Ee/（373±70 TeV）)2] at energies above ≈ 50 TeV. The cutoff energy of the electron spectrum is roughly equal to the expected current maximum energy of particles accelerated at the PWN terminal shock. combining the X-ray and gamma-ray emission, the current space-averaged magnetic field can be limited to≈ 4.5 μG. To satisfy the multi-wavelength spectrum and the γ-ray extensions, the transport of relativistic particles within the PWN is likely dominated by the advection process under the free-expansion phase assumption.

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Observation of the γ-ray emission from W43 with LHAASO

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Science china(Physics,Mechanics & Astronomy) 2025年

In this paper, we report the detection of the very-high-energy (VHE, 100 Ge V100 TeV) γ-ray emissions from the direction of the young star-forming region W43, observed by the Large High Altitude Air Shower Observation (LHAASO). The extended γ-ray source was detected with a significance of～16σby KM2A and～17σby WcDA, respectively. The angular extension of this γ-ray source is about 0.5 degrees, corresponding to a physical size of about 50pc. We discuss the origin of the γ-ray emission and possible cosmic ray acceleration in the W43 region using multi-wavelength data. Our findings suggest that W43 is likely another young star cluster capable of accelerating cosmic rays (cRs) to at least several hundred TeV.

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continuous purification of H2SO4 and HI phases by packed column in IS process

Continuous purification of H2SO4 and HI phases by packed col...

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第九届全国氢能学术会议

作者： Y.Bai,P.Zhang,j.c.wang Tsinghua University,china

＜正＞Iodine-sulfur（IS） water-splitting cycle is the most promising method of thermochemical hydrogen production process utilizing nuclear *** cycle is composed of three reactions: Bunsen reaction,HI decomposition reaction,and sulfuric acid decomposition *** Bunsen reaction,sulfuric acid and HIx generated and ***,these two acids

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Four α correlations in nuclear fragmentation: a game of resonances

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chinese Physics c 2021年第2期45卷 406-413页

作者： M.Huang A.Bonasera S.Zhang H.Zheng D.X.wang j.c.wang N.Song X.Tang L.Lu G.Zhang Z.Kohley M.R.D.Rodrigues Y.G.Ma S.j.Yennello college of Mathematics and Physics Inner Mongolia University for NationalitiesTongliao 028000China Institute of Nuclear Physics Inner Mongolia University for NationalitiesTongliao 028000China cyclotron Institute Texas A&M UniversityCollege StationTX 77843USA Laboratori Nazionali del Sud INFNvia Santa Sofia6295123 CataniaItaly School of Physics and Information Technology Shaanxi Normal UniversityXi'an 710119China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China chemistry Department Texas A&M UniversityCollege StationTX 77843USA Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China

Heavy ion collisions near the Fermi energy produce a‘freezout’region where fragments appear and later decay,emitting mainly neutrons,protons,alpha particles,and gamma *** decay products carry information about the decaying *** events may result in high yields of boson particles,especially alpha particles,and may carry important information about the nuclear Bose Einstein condensate(BEc).We study‘in medium’fourαcorrelations and link them to the‘fission’of 16O in two 8Be in the ground state or 12c*(Hoyle state)+α.Using novel techniques for the correlation functions,we confirm the resonance of 16O at 15.2 MeV excitation energy,and the possibility of a lower resonance,close to 14.72 *** latter resonance is the result of allαparticles having 92 keV relative kinetic energies.

关键词： 4αresonance Hoyle state Bose Einstein condensate heavy ion reactions

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Effect of Ti-cr-V alloy as a dopant on the dehydriding kinetics of Li-Mg-N-H system

Effect of Ti-Cr-V alloy as a dopant on the dehydriding kinet...

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第九届全国氢能学术会议

作者： j.c.wang,H.L.Li,S.M.wang,Z.M.Li,Y.Li,L.j.jiang,X.P.Liu General Research Institute for Non-ferrous Metals,china

Li-Mg-N-H system with high hydrogen capacity derived from Li-N-H that was proposed by chen et *** ***,the application of the system is hindered by its problematic dehydriding kinetics and high operating *** this work,the effect of solid solution (Ti-cr-V) on the dehydriding kinetics of the system was ***-Mg-N-H system doped with 4mol%Ti-cr-V alloy was prepared by ball milling a mixture of LiNH,MgH

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Geometrical reconstruction of fluorescence events observed by the LHAASO experiment

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chinese Physics c 2021年第4期45卷 416-425页

作者： F.Aharonian Q.An Axikegu L.X.Bai Y.X.Bai Y.W.Bao D.Bastieri X.j.Bi Y.j.Bi H.cai j.T.cai Z.cao Z.cao j.chang j.F.chang X.c.chang B.M.chen j.chen L.chen L.chen L.chen M.j.chen M.L.chen Q.H.chen S.H.chen S.Z.chen T.L.chen X.L.chen Y.chen N.cheng Y.D.cheng S.W.cui X.H.cui Y.D.cui B.Z.Dai H.L.Dai Z.G.Dai Danzengluobu D.della Volpe B.DEtorre Piazzoli X.j.Dong j.H.Fan Y.Z.Fan Z.X.Fan j.Fang j.Fang c.F.Feng L.Feng S.H.Feng Y.L.Feng B.Gao c.D.Gao Q.Gao W.Gao M.M.Ge L.S.Geng G.H.Gong Q.B.Gou M.H.Gu j.G.Guo X.L.Guo Y.Q.Guo Y.Y.Guo Y.A.Han H.H.He H.N.He j.c.He S.L.He X.B.He Y.He M.Heller Y.K.Hor c.Hou X.Hou H.B.Hu S.Hu S.c.Hu X.j.Hu D.H.Huang Q.L.Huang W.H.Huang X.T.Huang Z.c.Huang F.ji X.L.ji H.Y.jia K.jiang Z.j.jiang c.jin D.Kuleshov K.Levochkin B.B.Li c.Li c.Li F.Li H.B.Li H.c.Li H.Y.Li j.Li K.Li W.L.Li X.Li X.Li X.R.Li Y.Li Y.Z.Li Z.Li Z.Li E.W.Liang Y.F.Liang S.j.Lin B.Liu c.Liu D.Liu H.Liu H.D.Liu j.Liu j.L.Liu j.L.Liu j.S.Liu j.Y.Liu M.Y.Liu R.Y.Liu S.M.Liu W.Liu Y.N.Liu Z.X.Liu W.j.Long R.Lu H.K.Lv B.Q.Ma L.L.Ma X.H.Ma j.R.Mao A.Masood W.Mitthumsiri T.Montaruli Y.c.Nan B.Y..Pang P.Pattarakijwanich Z.Y.Pei M.Y.Qi D.Ruffolo V.Rulev A.Saiz L.Shao O.Shchegolev X.D.Sheng j.R.Shi H.c.Song Yu.V.Stenkin V.Stepanov Q.N.Sun X.N.Sun Z.B.Sun P.H.T.Tam Z.B.Tang W.W.Tian B.D.wang c.wang H.wang H.G.wang j.c.wang j.S.wang L.P.wang L.Y.wang R.N.wang W.wang W.wang X.G.wang X.j.wang X.Y.wang Y.D.wang Y.j.wang Y.P.wang Z.wang Z.wang Z.H.wang Z.X.wang D.M.Wei j.j.Wei Y.j.Wei T.Wen c.Y.Wu H.R.Wu S.Wu W.X.Wu X.F.Wu S.Q.Xi j.Xia j.j.Xia G.M.Xiang G.Xiao H.B.Xiao G.G.Xin Y.L.Xin Y.Xing D.L.Xu R.X.Xu L.Xue D.H.Yan c.W.Yang F.F.Yang j.Y.Yang L.L.Yang M.j.Yang R.Z.Yang S.B.Yang Y.H.Yao Z.G.Yao Y.M.Ye L.Q.Yin N.Yin X.H.You Z.Y.You Y.H.Yu Q.Yuan H.D.Zeng T.X.Zeng W.Zeng Z.K.Zeng M.Zha X.X.Zhai B.B.Zhang H.M.Zhang H.Y.Zhang j.L.Zhang j.W.Zhang L.Zhang L.Zhang L.X.Zhang P.F.Zhang P.F.Zhang R.Zhang S.R.Zhang S.S.Zhang X.Zhang X.P.Zhang Y.Zhang Y.Zhang Y.F.Zhang Y.L.Zhang B.Zhao j.Zhao L.Zhao L.Z.Zhao S.P.Zhao F.Zheng Y.Zheng B.Zhou H.Zhou j.N.Zhou P Key Laboratory of Particle Astrophyics&Experimental Physics Division&computing center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of chinese Academy of Sciences Beijing 100049China TIANFU cosmic Ray Research center ChengduSichuanChina State Key Laboratory of Paricle Detection and Electronics China University of Science and Technology of china HefeiAnhui 230026China Department of Engineering Physics Tsinghua UniversityBeijing 100084China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China National Space Science center Chinese Academy of SciencesBeijing 100190China School of Physics Peking UniversityBeijing 100871China center for Astrophysics Guangzhou UniversityGuangzhouGuangdong 510006China School of Physics and Astronomy&School of Physics(Guangzhou) Sun Yat-sen UniversityZhuhaiGuangdong 519000China School of Physical Science and Technology Guangxi UniversityNanningGuangxi 530004China Hebei Normal University ShijiazhuangHebei 050024China School of Physics and Microelectronics Zhengzhou UniversityZhengzhouHenan 450001China School of Astronomy and Space Science Nanjing UniversityNanjingJiangsu 210023China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjingJiangsu 210023China Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdaoShandong 266237China Key Laboratory for Research in Galaxies and cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China Tsung-Dao Lee Institute&School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China School of Physical Science and Technology Southwest Jiaotong UniversityChengduSichuan 610031China college of Physics Sichuan UniversityChengduSichuan 610065China Key Laboratory of cosmic Rays(Tibet University) Ministry of EducationLhasaTibet 850000China School of physics and technology Wuhan UniversityWuhanHubei 430072Ch

The LHAASO-WFcTA experiment,which aims to observe cosmic rays in the sub-EeV range using the fluorescence technique,uses a new generation of high-performance *** ensure that the experiment has ex-cellent detection capability associated with the measurement of the energy spectrum,the primary composition of cosmic rays,and so on,an accurate geometrical reconstruction of air-shower events is *** paper de-scribes the development and testing of geometrical reconstruction for stereo viewed events using the WFcTA(Wide Field of view cherenkov/Fluorescence Telescope Array)*** approaches,which take full advantage ofthe WFcTA *** *** is the stereo-angular method,which uses the pointing of triggered SiPMs in the shower trajectory,and the other is the stereo-timing method,which uses the triggering time of the fired *** results show that both methods have good geometrical resolution:the resolution of the stereo-timing method is slightly better than the stereo-angular method because the resolution of the latter is slightly limited by the shower track length.

关键词： cosmic ray fluorescence telescope stereo observation geometrical reconstruction

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