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Recent innovations in laser additive manufacturing of titanium alloys

International Journal of Extreme manufacturing 2024年第3期6卷 2-37页

作者： Jinlong Su Fulin Jiang Jie Teng Lequn Chen ming yan Guillermo Requena Lai-Chang Zhang y morris wang Ilya V Okulov Hongmei Zhu Chaolin Tan College of materials Science and Engineering Hunan UniversityChangsha 410082People’s Republic of China Singapore Institute of manufacturing Technology(SIm Tech) Agency for ScienceTechnology and Research(A∗STAR)5 Cleantech LoopSingapore 636732Singapore Department of materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China Institute of materials Research German Aerospace Center(DLR)Linder Höhe51147 CologneGermany Centre for Advanced materials and manufacturing Edith Cowan University270 Joondalup DriveJoondalupPerthWestern Australia 6027Australia Department of materials Science and Engineering University of CaliforniaLos AngelesCA 900095United States of America Leibniz Institute for materials Engineering-IWT Badgasteiner Str.328359 BremenGermany Faculty of Production Engineering University of BremenBadgasteiner Str.128359 BremenGermany Key Laboratory of Hunan Province of Equipment Safety Service Technology under Extreme Environment University of South ChinaHengyangPeople’s Republic of China RWTH Aachen University Metallic Structures and Materials Systems for Aerospace EngineeringD-52062 AachenGermany

Titanium(Ti)alloys are widely used in high-tech fields like aerospace and biomedical *** additive manufacturing(LAm),as an innovative technology,is the key driver for the development of Ti *** the significant advancements in LAm of Ti alloys,there remain challenges that need further research and development *** recap the potential of LAm high-performance Ti alloy,this article systematically reviews LAm Ti alloys with up-to-date information on process,materials,and *** feasible solutions to advance LAm Ti alloys are reviewed,including intelligent process parameters optimization,LAm process innovation with auxiliary fields and novel Ti alloys customization for *** auxiliary energy fields(***,acoustic,mechanical deformation and magnetic fields)can affect the melt pool dynamics and solidification behaviour during LAm of Ti alloys,altering microstructures and mechanical *** kinds of novel Ti alloys customized for LAm,like peritecticα-Ti,eutectoid(α+β)-Ti,hybrid(α+β)-Ti,isomorphousβ-Ti and eutecticβ-Ti alloys are reviewed in ***,machine learning in accelerating the LAm process optimization and new materials development is also *** review summarizes the material properties and performance envelops and benchmarks the research achievements in LAm of Ti *** addition,the perspectives and further trends in LAm of Ti alloys are also highlighted.

关键词： additive manufacturing titanium alloys auxiliary field machine learning aerospace materials lightweight materials novel alloys

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Summer Warming Limited Bud Output Drives a Decline in Daughter Shoot Biomass through Reduced Photosynthetis of Parent Shoots in Leymus chinensis Seedlings

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Phyton-International Journal of Experimental Botany 2024年第7期93卷 1667-1675页

作者： Song Gao Ruocheng Xu Lin Li Jiao wang Nian Liu Johannes m.H.Knops Junfeng wang Graduate School Changchun UniversityChangchun130022China Key Laboratory of Vegetation Ecology Ministry of EducationInstitute of Grassland ScienceSchool of Life SciencesJilin Songnen Grassland Ecosystem National Observation and Research StationNortheast Normal UniversityChangchun130024China Jilin Agricultural Radio and Television School Changchun130599China Department of Health and Environmental Sciences Xi’an Jiaotong Liverpool UniversitySuzhou215000China

Understanding how summer warming inﬂuences the parent and daughter shoot production in a perennial clonal grass is vital for comprehending the response of grassland productivity to global ***,we conducted a simulated experiment using potted Leymus chinensis,to study the relationship between the photosynthetic activ-ity of parent shoots and the production of daughter shoots under a whole(90 days)summer warming scenario(+3°C).The results showed that the biomass of parents and buds decreased by 25.52%and 33.45%,respectively,under warming *** reduction in parent shoot biomass due to warming directly resulted from decreased leaf area(18.03%),chlorophyll a(18.27%),chlorophyll b(29.21%)content,as well as a reduction in net photosynthetic rate(7.32%)and the maximum quantum efﬁciency of photosystem II(PSII)photochemistry(4.29%).The decline in daughter shoot biomass was linked to a decrease in daughter shoot number(33.33%)by ***,the number of belowground buds increased by 46.43%.The results indicated that long-term summer warming reduces biomass accumulation in parent shoot by increasing both limitation of stoma and ***,the parent shoot allocates relatively more biomass to the belowground organs to maintain the survival and growth of ***,buds,as a potential aboveground population,could remedy for the cur-rent loss of parent shoot density by increasing the number of future daughter shoots if summer warming subsides.

关键词： Warming parent shoot bud bank photosynthesis chlorophyllﬂuorescence Leymus chinensis

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Effect of icosahedral phase formation on the stress corrosion cracking(SCC)behaviors of the as-cast mg-8%Li(in wt.%)based alloys

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Journal of magnesium and Alloys 2024年第1期12卷 225-236页

作者： Shuo wang Daokui Xu Dongliang wang Zhiqiang Zhang Baojie wang Key Lab of Electromagnetic Processing of materials Ministry of EducationNortheastern UniversityShenyang110819China Key Laboratory of Nuclear materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Engineering Research Center of Advanced materials Preparing Technology Ministry of EducationNortheastern UniversityShenyang110819China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang110159China Binzhou Institute of Technology BinzhouShandong Province256606China Shandong Key Laboratory of Advanced Aluminium materials and Technology BinzhouShandong Province256606China

Through exploring the stress corrosion cracking(SCC)behaviors of the as-cast mg-8%Li and mg-8%Li-6%Zn-1.2%y alloys in a 0.1 m NaCl solution,it revealed that the SCC susceptibility index(I_(SCC))of the mg-8%Li alloy was 47%,whilst the I_(SCC)of the mg-8%Li-6%Zn-1.2%y alloy was 68%.Surface,cross-sectional and fractography observations indicated that for the mg-8%Li alloy,theα-mg/β-Li interfaces acted as the preferential crack initiation sites and propagation paths during the SCC *** regard to the mg-8%Li-6%Zn-1.2%y alloy,the crack initiation sites included the I-phase and the interfaces of I-phase/β-Li andα-mg/β-Li,and the preferential propagation paths were the I-phase/β-Li andα-mg/β-Li ***,the SCC of the two alloys was concerned with hydrogen embrittlement(HE)mechanism.

关键词： magnesium-lithium alloy Stress corrosion cracking I-phase Fracture analysis

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Embedded majorana islands

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Science China(Physics,mechanics & Astronomy) 2024年第9期Mechanics & Astronomy) .卷 158-168页

作者： Jin-Xing Hou Alex Weststr?m Rui wang Wen-Li yang Jian Li Institute of modern Physics Northwest University Department of Physics School of ScienceWestlake University Shaanxi Key Laboratory for Theoretical Physics Frontiers Institute of Natural Sciences Westlake Institute for Advanced Study National Laboratory of Solid State microstructures and Department of Physics Nanjing University Collaborative Innovation Center for Advanced microstructures Peng Huanwu Center for Fundamental Theory

mesoscopic superconducting islands hosting majorana zero modes(mZms), or majorana islands in short, offer a prototype of topological qubits. In this work we investigate theoretically the model of a generic majorana island tunneling-coupled to a singlepiece metallic substrate, hence an embedded majorana island. We show the crucial consequences of an interplay between the topological ground states nonlocally addressed by the mZms and the metallic bath with coherent electron propagation: on the one hand, the topological degeneracy on the majorana island can be preserved, by virtue of the particle-hole symmetry, despite the apparent bath-induced coupling between mZms; on the other hand, the electronic interference in the metallic bath may lead to profound alterations to the renormalization group behavior of the hybrid system towards low energy/temperature compared with conventional Kondo physics. This work serves to establish the model of embedded majorana islands as an experimentally relevant and theoretically intriguing problem particularly in the direction of topological quantum computation.

关键词： majorana zero modes mesoscopic superconductor topological Kondo effect topological quantum computation topological qubit

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Internal m^(6)A and m^(7)G RNA modifications in hematopoietic system and acute myeloid leukemia

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Chinese medical Journal 2024年第9期137卷 1033-1043页

作者： Xiaoxu Zhang yanni ma Jia yu Rui Su Xiaoshuang wang State Key Laboratory of Common mechanism Research for major Diseases State Key Laboratory for ComplexSevereand Rare DiseasesInstitute of Basic Medical SciencesChinese Academy of Medical Sciences/Peking Union Medical CollegeBeijing 100005China Department of Systems Biology Beckman Research Institute of City of HopeMonroviaCA 91016USA The Institute of Blood Transfusion Chinese Academy of Medical Sciences/Peking Union Medical CollegeChengduSichuan 610052China Key Laboratory of RNA and Hematopoietic Regulation Chinese Academy of Medical SciencesBeijing 100005China Department of Biochemistry and molecular Biology Chinese Academy of Medical SciencesSchool of Basic Medicine Peking Union Medical CollegeBeijing 100005China

Epitranscriptomics focuses on the RNA-modification-mediated post-transcriptional regulation of gene *** past decade has witnessed tremendous progress in our understanding of the landscapes and biological functions of RNA modifications,as prompted by the emergence of potent analytical *** hematopoietic system provides a lifelong supply of blood cells,and gene expression is tightly controlled during the differentiation of hematopoietic stem cells(HSCs).The dysregulation of gene expression during hematopoiesis may lead to severe disorders,including acute myeloid leukemia(AmL).Emerging evidence supports the involvement of the mRNA modification system in normal hematopoiesis and AmL pathogenesis,which has led to the development of small-molecule inhibitors that target N6-methyladenosine(m^(6)A)modification machinery as ***,we summarize the latest findings and our most up-to-date information on the roles of m^(6)A and N7-methylguanine in both physiological and pathological conditions in the hematopoietic ***,we will discuss the therapeutic potential and limitations of cancer treatments targeting m^(6)A.

关键词： N6-methyladenosine N7-methylguanine Hematopoiesis Acute myeloid leukemia Therapeutic target RNA modifications

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The Lobster Eye Imager for Astronomy Onboard the SATech-01 Satellite

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天文和天体物理学研究:英文版 2023年第9期23卷 66-78页

作者： Z.X.Ling X.J.Sun C.Zhang S.L.Sun G.Jin S.N.Zhang X.F.Zhang J.B.Chang F.S.Chen y.F.Chen Z.W.Cheng W.Fu y.X.Han H.Li J.F.Li y.Li Z.D.Li P.R.Liu y.H.Lv X.H.ma y.J.Tang C.B.wang R.J.Xie y.L.Xue A.L.yan Q.Zhang C.y.Bao H.B.Cai H.Q.Cheng C.Z.Cui y.F.Dai D.W.Fan H.B.Hu J.W.Hu m.H.Huang Z.Q.Jia C.C.Jin D.y.Li J.Q.Li H.y.Liu m.J.Liu y.Liu H.W.Pan y.L.Qiu m.Sugizaki H.Sun W.X.wang y.L.wang Q.y.Wu X.P.Xu y.F.Xu H.N.yang X.yang B.Zhang m.Zhang W.D.Zhang Z.Zhang D.H.Zhao X.Q.Cong B.W.Jiang L.H.Li X.B.Qiu J.N.Sun D.T.Su J.wang C.Wu Z.Xu X.m.yang S.K.Zhang Z.Zhang N.Zhang y.F.Zhu H.y.Ban X.Z.Bi Z.m.Cai W.Chen X.Chen y.H.Chen y.Cui X.L.Duan Z.G Feng y.Gao J.W.He T.He J.J.Huang F.Li J.S.Li T.J.Li T.T.Li H.Q.Liu L.Liu R.Liu S.Liu N.meng Q.Shi A.T.Sun y.m.wang y.B.wang H.C.Wu D.X Xu y.Q yang y.yang X.S.yu K.X.Zhang y.L.Zhang y.H.Zhang y.T.Zhang H.Zhou X.C.Zhu J.S.Cheng L.Qin L.wang Q.L.wang m.Bai R.L.Gao Z.Ji y.R.Liu F.L.ma y.J.Shi J.Su y.y.Tan J.Z.Tong H.T.Xu C.B.Xue G.F.Xue W.yuan National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai 200083China North Night Vision Technology Co. LTDNanjing 211106China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Science and Technology on Low-Light-Level Night Vision Laboratory Xi'an 710065China Innovation Academy for microsatellites Chinese Academy of SciencesShanghai 201204China Institute of Electrical Engineering Chinese Academy of ScienceBeijing 100190China National Space Science Center Chinese Academy of ScienceBeijing 100190China

The Lobster Eye Imager for Astronomy(LEIA),a pathfinder of the Wide-field X-ray Telescope of the Einstein Probe mission,was successfully launched onboard the SATech-01 satellite of the Chinese Academy of Sciences on2022 July *** this paper,we introduce the design and on-ground test results of the LEIA *** stateof-the-art micro-Pore Optics(mPO),a wide field of view of 346 square degrees(18.6°×18.6°)of the X-ray imager is *** optical assembly composed of 36 mPO chips is used to focus incident X-ray photons,and four large-format complementary metal-oxide semiconductor(CmOS)sensors,each of size 6 cm×6 cm,are used as the focal plane *** instrument has an angular resolution of 4’-8’(in terms of FWHm)for the central focal spot of the point-spread function,and an effective area of 2-3 cm^(2) at 1 keV in essentially all the directions within the field of *** detection passband is 0.5-4 keV in soft X-rays and the sensitivity is2-3×10^(-11) erg s^(-1) cm^(-2)(about 1 milliCrab)with a 1000 s *** total weight of LEIA is 56 kg and the power is 85 *** satellite,with a design lifetime of 2 yr,operates in a Sun-synchronous orbit of 500 km with an orbital period of 95 *** is paving the way for future missions by verifying in flight the technologies of both novel focusing imaging optics and CmOS sensors for X-ray observation,and by optimizing the working setups of the instrumental *** addition,LEIA is able to carry out scientific observations to find new transients and to monitor known sources in the soft X-ray band,albeit with limited useful observing time available.

关键词： instrumentation detectors-space vehicles instruments-telescopes-X-rays genera

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In-situ construction of grass-like hybrid architecture responsible for extraordinary corrosion performance: Experimental and theoretical approach

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Nano materials Science 2024年第1期6卷 44-59页

作者： T.Suhartono F.Hazmatulhaq y.Sheng A.Chaouiki m.P.Kamil y.G.Ko materials Electrochemistry Group School of Materials Science and EngineeringYeungnam UniversityGyeongsan38541Republic of Korea Research Center for Advanced materials National Research and Innovation Agency(BRIN)South TangerangBanten15314Indonesia

Despite the engineering potential by the co-existence of inorganic and organic substances to protect vulnerable metallic materials from corrosive environments,both their interaction and in-situ formation mechanism to induce the nature-inspired composite remained less *** present work used three distinctive mercaptobenzazole(mB)compounds working as corrosion inhibitors,such as 2-mercaptobenzoxazole(mBO),2-mercaptobenzothiazole(mBT),and 2-mercaptobenzimidazole(mBI)in a bid to understand how the geometrical structure arising from O,S,and N atoms affected the interaction toward inorganic *** compounds that were used here to control the corrosion kinetics would be interacted readily with the pre-existing mgO layer fabricated by plasma *** phenomenon triggered the nucleation of the root network since mB compounds were seen to be adsorbed actively on the defective surface through the active sites in mB ***,the molecule with twin donor atoms adjacent to the mercapto-sites affected the facile growth of the grass-like structures with‘uniform’distribution via molecular self-assembly,which showed better corrosion performance than those with having dissimilar donor atoms with the inhibition efficiency(η)of 97%*** formation mechanism underlying nucleation and growth behavior of mB molecule was discussed concerning the theoretical calculation of density functional theory.

关键词： Nature-inspired composite Organic-inorganic interaction Corrosion inhibitor Density functional theory Electrochemistry

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A hierarchical multi-UAV cooperative framework for infrastructure inspection and reconstruction

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Control Theory and Technology 2024年第3期22卷 394-405页

作者： Chuanxiang Gao Xinyi wang Xi Chen Ben m.Chen Department of mechanical and Automation Engineering The Chinese University of Hong KongHong KongShatinNTChina

Unmanned aerial vehicles(UAVs)are emerging as a powerful tool for inspections and repair works in large-scale and unstructured 3D infrastructures,but current approaches take a long time to cover the entire *** using UAVs for inspections and repair works puts forward a requirement of improving time efficiency in large-scale and cluster *** paper presents a hierarchical multi-UAV cooperative framework for infrastructure inspection and reconstruction to balance the workload and reduce the overall task completion *** proposed framework consists of two stages,the exploration stage and the exploitation stage,resolving the task in a sequential *** the exploration stage,the density map is developed to update global and local information for dynamic load-balanced area partition based on reconstructability and relative positions of UAVs,and the Voronoi-based planner is used to enable the UAVs to reach their best *** obtaining the global map,viewpoints are generated and divided while taking into account the battery capacity of each ***,a shortest path planning method is used to minimize the total traveling cost of these viewpoints for obtaining a high-quality *** experiments are conducted in both a simulated and real environment to show the time efficiency,robustness,and effectiveness of the proposed ***,the whole system is implemented in real applications.

关键词： multi-UAV Coverage path planning Infrastructure inspection and reconstruction

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Hybrid-Vlasov simulation of soft X-ray emissions at the Earth’s dayside magnetospheric boundaries

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Earth and Planetary Physics 2024年第1期8卷 70-88页

作者： m.Grandin H.K.Connor S.Hoilijoki m.Battarbee y.Pfau-Kempf U.Ganse K.Papadakis m.Palmroth Department of Physics University of HelsinkiHelsinkiFinland NASA Goddard Space Flight Center GreenbeltMD20771USA Space and Earth Observation Centre Finnish Meteorological InstituteHelsinkiFinland

Solar wind charge exchange produces emissions in the soft X-ray energy range which can enable the study of near-Earth space regions such as the magnetopause,the magnetosheath and the polar cusps by remote sensing *** Solar wind magnetosphere Ionosphere Link Explorer(SmILE)and Lunar Environment heliospheric X-ray Imager(LEXI)missions aim to obtain soft Xray images of near-Earth space thanks to their Soft X-ray Imager(SXI)*** earlier modeling works have already simulated soft X-ray images as might be obtained by SmILE SXI during its mission,the numerical models used so far are all based on the magnetohydrodynamics description of the space *** investigate the possible signatures of ion-kinetic-scale processes in soft Xray images,we use for the first time a global hybrid-Vlasov simulation of the geospace from the Vlasiator *** simulation is driven by fast and tenuous solar wind conditions and purely southward interplanetary magnetic *** first produce global X-ray images of the dayside near-Earth space by placing a virtual imaging satellite at two different locations,providing meridional and equatorial *** then analyze regional features present in the images and show that they correspond to signatures in soft X-ray emissions of mirrormode wave structures in the magnetosheath and flux transfer events(FTEs)at the *** results suggest that,although the time scales associated with the motion of those transient phenomena will likely be significantly smaller than the integration time of the SmILE and LEXI imagers,mirror-mode structures and FTEs can cumulatively produce detectable signatures in the soft X-ray *** instance,a local increase by 30%in the proton density at the dayside magnetopause resulting from the transit of multiple FTEs leads to a 12%enhancement in the line-of-sight-and time-integrated soft X-ray emissivity originating from this ***,a proton density increase by 14%in the magnetosheath

关键词： magnetosphere magnetosheath numerical simulation SmILE LEXI soft X-ray emissions hybrid-Vlasov model polar cusp flux transfer events mirror-mode waves

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Greatly enhanced corrosion/wear resistances of epoxy coating for mg alloy through a synergistic effect between functionalized graphene and insulated blocking layer

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Journal of magnesium and Alloys 2024年第1期12卷 332-344页

作者： Z.y.Xue X.J.Li J.H.Chu m.m.Li D.N.Zou L.B.Tong School of metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an 710055China State Key Laboratory of Advanced Design and manufacturing for Vehicle Body Hunan UniversityChangsha 410082China

The poor corrosion and wear resistances of mg alloys seriously limit their potential applications in various *** conventional epoxy coating easily forms many intrinsic defects during the solidification process,which cannot provide sufficient *** the current study,we design a double-layer epoxy composite coating on mg alloy with enhanced anti-corrosion/wear properties,via the spin-assisted assembly *** outer layer is functionalized graphene(FG)in waterborne epoxy resin(WEP)and the inner layer is Ce-based conversion(Ce)*** FG sheets can be homogeneously dispersed within the epoxy matrix to fill the intrinsic defects and improve the barrier *** Ce film connects the outer layer with the substrate,showing the transition *** corrosion rate of Ce/WEP/FG composite coating is 2131 times lower than that of bare mg alloy,and the wear rate is decreased by~90%.The improved corrosion resistance is attributed to the labyrinth effect(hindering the penetration of corrosive medium)and the obstruction of galvanic coupling *** synergistic effect derived from the FG sheet and blocking layer exhibits great potential in realizing the improvement of multi-functional integration,which will open up a new avenue for the development of novel composite protection coatings of mg alloys.

关键词： mg alloy Functionalized graphene Epoxy coating Corrosion/wear resistance Blocking layer

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