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Microstructure and mechanical properties of cast Al-Li-Mg alloy:Role of Cu addition and heat treatment

Journal of Materials science & Technology 2024年第32期199卷 1-16页

作者： Fangzhou Qi Guohua Wu Liang Zhang Xin Tong Xuanxi Xu Youjie Guo National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

In this work,the effect of Cu addition and heat treatment schemes on the microstructural evolution,mechanical properties,and corresponding strengthening mechanism of cast Al-Li-Mg alloy were *** indicate that the dendritic segregation would be induced after the introduction of Cu,and a well-designed two-stage solution treatment could effectively dissolve secondary *** Cu addi-tion,aging hardening responses of the alloys were accelerated,accompanied by a continuous increase in the volume fraction of both S’-Al_(2) CuMg and Al_(3) Li phases,which enhanced the precipitation strengthen-ing ***,in Cu-containing alloys,both the coarsening of Al_(3) Li phases and the expansion of Al3 Li-precipitation free zones(PFZ)were inhibited during the aging ***,severe strain accumulation was found at the interface between the coalesced S’phase andα-Al matrix,which reduced the ductility of the alloy.A good combination of strength and ductility(YS=308 MPa,UTS=428 MPa,EL=5.0%)was obtained in the Al-2.5Li-2Mg-1Cu-0.12Zr alloy aged at 175°C for 32 h due to the nar-rowed Al3 Li-PFZ and the synergistic strengthening of Al3 Li and S’*** work is expected to provide guidelines for designing novel cast Al-Li alloys with wider applications.

关键词： Cast Al-Li alloy Cu addition Heat treatment Al_(3)Li Al_(2)CuMg Strength mechanisms

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Ordered mesoporous materials for water pollution treatment:Adsorption and catalysis

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Green Energy & Environment 2024年第8期9卷 1239-1256页

作者： Peng Zhang Mingming He Wei Teng Fukuan Li Xinyuan Qiu Kexun Li Hao Wang College of Environmental Science and Engineering MOE Key Laboratory of Pollution Processes and Environmental CriteriaTianjin Key Laboratory of Environmental Remediation and Pollution TreatmentTianjin Key Laboratory of Environmental Technology for Complex Trans-Media PollutionNankai UniversityTianjin300350China Department of Chemistry and State Key Laboratory Marine Pollution Hong Kong Institute for Advanced Study City University of Hong KongHong Kong999077China State Key Laboratory for Pollution Treatment College of Environmental Science and EngineeringShanghai Institute of Pollution Treatment and Ecological SecurityTongji UniversityShanghai200092China State Key Laboratory of Simulation and Regulation of Water Cycles in River Basins China Institute of Water Resources and Hydropower ResearchBeijing100038China

To meet the growing emission of water contaminants,the development of new materials that enhance the efficiency of the water treatment system is *** mesoporous materials provide opportunities in environmental processing applications due to their exceptionally high surface areas,large pore sizes,and enough pore *** properties might enhance the performance of materials concerning adsorption/catalysis capability,durability,and *** this review,we enumerate the ordered mesoporous materials as adsorbents/catalysts and their modifications in water pollution treatment from the past decade,including heavy metals(Hg^(2+),Pb^(2+),Cd^(2+),Cr^(6+),etc.),toxic anions(nitrate,phosphate,fluoride,etc.),and organic contaminants(organic dyes,antibiotics,etc.).These contributions demonstrate a deep understanding of the synergistic effect between the incorporated framework and homogeneous active ***,the challenges and perspectives of the future developments of ordered mesoporous materials in wastewater treatment are *** work provides a theoretical basis and complete summary for the application of ordered mesoporous materials in the removal of contaminants from aqueous solutions.

关键词： Water pollution treatment Ordered mesoporous materials Toxic contaminants Adsorption Catalysis

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High cycle fatigue performance at 650℃and corresponding fracture behaviors of GH4169 joint produced by linear friction welding

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Chinese Journal of Aeronautics 2025年第1期38卷 622-637页

作者： Shitong MA Xiawei YANG Zhenguo GUO Yu SU Xinyuan HE Ju LI Jun TAO Bo XIAO Wenya LI State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding TechnologiesSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Aeronautical Key Laboratory for Welding and Joining Technologies AVIC Manufacturing Technology InstituteBeijing 100024China Department of Mechanical Engineering City University of HongKongHongKongChina

GH4169 joints manufactured by Linear Friction Welding(LFW)are subjected to tensile test and stair-case method to evaluate the High Cycle Fatigue(HCF)performance at 650℃.The yield and ultimate tensile strengths are 582 MPa and 820 MPa,*** HCF strength of joint reaches 400 MPa,which is slightly lower than that of Base Metal(BM),indicating reliable quality of this type of *** microstructure observation results show that all cracks initiate at the inside of specimens and transfer into deeper region with decrease of external stress,and the crack initiation site is related with microhardness of *** Electron Backscattered Diffraction(EBSD)results of the observed regions with different distances to fracture show that plastic deformation plays a key role in HCF,and the Schmid factor of most grains near fracture exceeds *** addition,the generation of twins plays a vital role in strain concentration release and coordinating plastic deformation among grains.

关键词： High cycle fatigue GH4169 superalloy Linear friction welding Fracture mechanism Microstructure evolution

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Cascading effects of top predator changes in a seagrass bed under selective fishing

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生态过程（英文） 2025年第1期14卷 141-151页

作者： Shixuan Chen Qiang He State Key Laboratory of Wetland Conservation and Restoration Ministry of Education Key Laboratory for Biodiversity Science and Ecological EngineeringNational Observation and Research Station for Wetland Ecosystems of the Yangtze EstuarySchool of Life SciencesFudan University2005 Songhu RoadShanghai 200438China

Background With the widespread promotion of selective fishing which may target top predatory fishes,the abun-dance and species composition of top predators could change,which may further impact species at lower trophic levels through a chain of cascading trophic ***,the top-down effects of changes in predator com-munities driven by selective fishing remain poorly investigated. Methods Focusing on a seagrass ecosystem,we investigated how changes in two coexisting top predators(Lateo-labraxjaponicus and Acanthogobius ommaturus)under different selective fishing scenarios would affect species at lower trophic levels in a field manipulative experiment. Results We found that the trophic niches of *** and *** overlapped greatly,although not *** loss of *** led to increases in ***,the abundances of herbivorous benthos Barleeia bureri increased likely owing to ***'s suppression of low-level predators,while epiphyte and seagrass biomass decreased significantly likely owing to ***'s disturbance of seagrasses and *** both predators were depleted,the biomasses of herbivorous benthos Cyclina sinensis and *** increased significantly likely owing to the absence of top predators'disturbance of sediments,while epiphyte and seagrass biomass did not change. Conclusions Our study showed that loss of one top predator could lead to rapid changes in species at lower trophic levels in seagrass beds,depending on changes in,and the trophic or non-trophic effects(including biological distur-bances)of,its ***,in fisheries resource management,the ecological impacts of selectively fishing a target predator must be managed considering changes in,and the trophic or non-trophic effects of,its competitors where present.

关键词： Top-down effect Top predator Trophic niche overlap Seagrass bed Selective fishing

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Bifunctional iron-porphyrin metal-organic frameworks for organic photoelectrochemical transistor gating and biosensing

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Chinese Chemical Letters 2025年第3期36卷 227-231页

作者： Cheng-Shuang Wang Bing-Yu Zhou Yi-Feng Wang Cheng Yuan Bo-Han Kou Wei-Wei Zhao Jing-Juan Xu State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China School of Materials Science and Engineering Yancheng Institute of TechnologyYancheng 224051China

Iron-porphyrin metal-organic frameworks(MOFs)have emerged as a remarkable class of semiconductors with adjustable photoelectrical properties and peroxidase-mimicking activities,yet their full potential remains largely *** organic photoelectrochemical transistor(OPECT)has been proven to be a prominent platform for diverse ***,iron-porphyrin MOFs,as bifunctional photo-gating module and horseradish peroxidase-mimicking nanozyme,is explored for novel OPECT *** by alpha-fetoprotein(AFP)-dependent sandwich immunorecognition and therein glucose oxidase(GOx)-generated H_(2)O_(2)to etch CdS quantum dots on the surface of iron-porphyrin MOFs,this OPECT bioanalysis achieved high-performance AFP detection with a low detection limit of 24 fg/*** work featured a bifunctional iron-porphyrin MOFs gated OPECT,which is envisioned to inspire more interest in developing the diverse MOFs-nanozymes toward novel optoelectronics and beyond.

关键词： Organic photoelectrochemical transistor Iron-porphyrin metal-organic frameworks Nanozymes Peroxidase-mimicking activity Biosensing

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Plasmon-enhanced self-powered GaN/ZnTe core/shell nanopillar array photodetector

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Nano Research 2024年第6期17卷 5569-5577页

作者： Jianqi Dong Dongqi Zhang Yi Ma Daotong You Jinping Chen Bin Liu Xingfu Wang Zengliang Shi Chunxiang Xu State Key Laboratory of Digital Medical Engineering School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials National Laboratory of Solid State MicrostructuresSchool of Electronic Science and EngineeringNanjing UniversityNanjing 210093China Institute of Photonics Technology Jinan UniversityGuangzhou 510632China Guangdong Engineering Research Center of Optoelectronic Functional Materials and Devices Institute of SemiconductorsSouth China Normal UniversityGuangzhou 510631China

Nanostructure photodetectors,as the core component of optoelectronic devices,are mainly focused on the precise preparation of mixed-component nano-heterostructures and the realization of zero power consumption ***,we successfully fabricated n-GaN/p-ZnTe core/shell nanopillar array and realized self-power ultraviolet/violet *** radial heterojunction nanodevice reveals high light-dark current ratio of 104 at 0 V bias,indicating effective carriers’*** more,by integrating plasmonic effect,the responsivity and detectivity of the Au nanoparticles decorated device are increased from 3.85 to 148.83 mA/W and 4.45×1011 to 2.33×1012 Jones under 325 nm UV light *** the rise and the fall time are decreased 1.3 times and 6.8 times under 520 nm visible light irradiation at 0 V *** high photocurrent gain is derived from that the oscillating high-energy hot electrons in Au nanoparticles spontaneously inject into the ZnTe conduction band to involve the photodetection *** work presents an effective route to prepare high-performance self-power photodetector and provides a promising blueprint to realize different functional photoelectronic devices based on core/shell nanostructure.

关键词： GaN/ZnTe core/shell nanopillar array self-power ultraviolet/visible photodetector plasmonic effect

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Metal-halide perovskites for high-efficiency radiation shielding applications

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Light(science & Applications) 2023年第1期12卷 8-9页

作者： Qingfeng Dong Yanjun Fang State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China

The ionizing radiation possesses extremely strong penetration capability,which poses serious risk on the health of the human body and jeopardize *** the authors demonstrate that MAPbl3/epoxy composites prepared by a s... 详细信息

关键词： composites perovskite halide

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Magnetic nanofluid-based liquid marble for a self-powered mechanosensation

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Droplet 2024年第3期3卷 57-64页

作者： Manhui Chen Ziwei Liu Yike Li Shanfei Zhang Peng Chen Pengyu Zhang Bin Su State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanChina

Magnetic nanofluid possesses the characteristic of interfering with the propagation of the magnetic field,endowing it with the sensing property in ***,the residual adhesion of magnetic nanofluid as it flows over solid surfaces remains an open *** marbles allow for quantities of liquids to be encapsulated by hydrophobic particles,ensuring a unique nonstick property for utilization in different *** this study,being capsuled by hydrophobic nano-/microscale powders,a magnetic nanofluid-based liquid marble(MNLM)with well mechanical stability has been fabricated.A magnetic nanofluid posture detector(MNPD),which consists of an MNLM,a magnetic tube,and coils,has been assembled that can convert mechanical energy to electricity as it freely rolls on the solid *** recognition can be achieved when combining five MNPDs with *** fabricated MNPD possesses a good signal recognition capability,which can separately distinguish the bending of each ***,a variety of language hand gestures with specific meanings(dig-its,letters,“OK,”and“I Love You”)can be further recognized through corresponding *** potential of MNPD in the realm of gesture recognition will offer a novel avenue for flexible wearables.

关键词： wear fluid property

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Emerging probing perspective of two-dimensional materials physics:terahertz emission spectroscopy

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Light(science & Applications) 2024年第7期13卷 1278-1298页

作者： Yifei Wu Yuqi Wang Di Bao Xiaonan Deng Simian Zhang Lin Yu-chun Shengxian Ke Jianing Liu Yingjie Liu Zeli Wang Pingren Ham Andrew Hanna Jiaming Pan Xinyue Hu Zhengcao Li Ji Zhou Chen Wang State Key Laboratory of New Ceramics and Fine Processing Key Laboratory of Advanced Materials of Ministry of EducationSchool of Materials Science and EngineeringTsinghua University100084 BeijingChina Beijing Advanced Innovation Center for Integrated Circuits 100084 BeijingChina

Terahertz(THz)emission spectroscopy(TES)has emerged as a highly effective and versatile technique for investigating the photoelectric properties of diverse materials and nonlinear physical processes in the past few ***,research on two-dimensional(2D)materials has experienced substantial growth due to their atomically thin structures,exceptional mechanical and optoelectronic properties,and the potential for applications in flexible electronics,sensing,and ***,these materials offer advantages such as tunable bandgap,high carrier mobility,wideband optical absorption,and relatively short carrier *** applying TES to investigate the 2D materials,their interfaces and heterostructures,rich information about the interplay among photons,charges,phonons and spins can be unfolded,which provides fundamental understanding for future *** it is timely to review the nonlinear processes underlying THz emission in 2D materials including optical rectification,photon-drag,high-order harmonic generation and spin-to-charge conversion,showcasing the rich diversity of the TES employed to unravel the complex nature of these *** applications based on THz emissions,such as THz lasers,ultrafast imaging and biosensors,are also *** further,we analyzed the unique advantages of spintronic terahertz emitters and the future technological advancements in the development of new THz generation mechanisms leading to advanced THz sources characterized by wide bandwidth,high power and integration,suitable for industrial and commercial *** continuous advancement and integration of TES with the study of 2D materials and heterostructures promise to revolutionize research in different areas,including basic materials physics,novel optoelectronic devices,and chips for post-Moore’s era.

关键词： optoelectronic versatile exceptional

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An MOF-Based Single-Molecule Propylene Nanotrap for Benchmark Propylene Capture from Ethylene

Chem and Bio Engineering

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Chem and Bio engineering 2024年第11期1卷 952-959页

作者： Wang, Jia-Xin Zhang, Teng-Fei Pei, Jiyan Liu, Di Wang, Yu-Bo Gu, Xiao-Wen Qian, Guodong Li, Bin State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and Engineering Zhejiang University Hangzhou310027 China

Highly selective capture and separation of propylene (C3H6) from ethylene (C2H4) presents one of the most crucial processes to obtain pure C2H4 in the petrochemical industry. The separation performance of current physisorbents is commonly limited by insufficient C3H6 binding affinity, resulting in poor low-pressure C3H6 uptakes or inadequate C3H6/C2H4 selectivities. Herein, we realize a unique single-molecule C3H6 nanotrap in an ultramicroporous MOF material (Co(pyz)[Pd(CN)4], ZJU-74a-Pd), exhibiting the benchmark C3H6 capture capacity at low-pressure regions. This MOF-based nanotrap features the sandwichlike strong multipoint binding sites and the perfect size match with C3H6 molecules, providing an ultrastrong C3H6 binding affinity with the maximal Qst value (55.8 kJ mol-1). This affords the nanotrap to exhibit one of the highest C3H6 uptakes at low pressures (60.5 and 103.8 cm3 cm-3 at 0.01 and 0.1 bar) and record-high C3H6/C2H4 selectivity (23.4). Theoretical calculations reveal that the perfectly size-matched pore cavities combined with sandwichlike multibinding sites enable this single-molecule C3H6 nanotrap to maximize the C3H6 binding affinity, mainly accounting for its record low-pressure C3H6 capture capacity and selectivity. Breakthrough experiments further confirm its excellent separation capacity for actual 1/99 and 50/50 C3H6/C2H4 mixtures, affording the remarkably high pure C2H4 productivities of 17.1 and 3.4 mol kg-1, respectively. © 2024 The Authors. Co-published by Zhejiang University and American Chemical Society.

关键词： Binding sites

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