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In-situ experiment tests and particulate simulations on powder paving process of additive manufacturing

Particuology 2023年第3期74卷 164-172页

作者： Tan Cheng Hui Chen Qing Teng Qingsong Wei State Key Lab of Materials Forming and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Department of Mechanical Engineering National University of SingaporeSingapore117575Singapore

In this work,in-situ experimental tests are first performed to investigate the powder spreading process of additive manufacturing,where different kinds of scrapers and spreading speeds are *** kinetic behaviours of individual powder particles are discussed by discrete element method *** is found that the decrease of inclination angle of the scraper improves the powder pressure and compaction in the spreading process,leading to a denser powder flow and thus a denser powder *** increase of spreading speed also improves the powder pressure and compaction in the spreading ***,the powder flow becomes looser due to the volume dilation,and thus the quality of the paved powder bed *** industrial applications,if the higher powder spreading speed is employed to improve the processing efficiency,the scraper with a smaller inclination angle can be used to ensure the powder bed quality.

关键词： Additive manufacturing Powder paving Packing quality Powder bed Inclination angle In-situ measurement

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TiO_(2)@C catalyzed hydrogen storage performance of Mg-Ni-Y alloy with LPSO and ternary eutectic structure

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Journal of Magnesium and Alloys 2024年第2期12卷 767-778页

作者： Wenjie Song Wenhao Ma Shuai He Wei Chen Jianghua Shen Dalin Sun Qiuming Wei Xuebin Yu College of Mechanical and Electrical Engineering Shaanxi University of Science and TechnologyXi’anShaanxi 710021China Department of Materials Science Fudan UniversityShanghai 200438China School of Aeronautics Northwestern Polytechnical UniversityXi’anShaanxi 710072China Department of Mechanical Engineering&Engineering Science the University of North Carolina at CharlotteCharlotteNorth Carolina 28223United States of America

A designed Mg_(88.7)Ni_(6.3)Y_(5)hydrogen storage alloy containing 14H type LPSO(long-period stacking ordered)and ternary eutectic structure was prepared by regulating the alloy composition and *** hydrogen storage performance of the alloy was improved by adding nano-flower-like TiO_(2)@C *** decomposition of the LPSO structure during hydrogenation led to the formation of plenty of nanocrystals which provided abundant interphase boundaries and activation *** nanoscale TiO_(2)@C catalyst was uniformly dispersed on the surface of alloy particles,and the"hydrogen overflow''effect of TiO_(2)@C accelerated the dissociation and diffusion of hydrogen on the surface of the alloy *** a result,the in-situ endogenous nanocrystals of the LPSO structure decomposition and the externally added flower-like TiO_(2)@C catalyst uniformly dispersed on the surface of the nanoparticles played a synergistic catalytic role in improving the hydrogen storage performance of the Mg-based *** the addition of the TiO_(2)@C catalyst,the beginning hydrogen desorption temperature was reduced to 200℃.Furthermore,the saturated hydrogen absorption capacity of the sample was 5.32 wt.%,and it reached 4.25 wt.%H_(2) in 1 min at 200℃and 30 bar.

关键词： Hydrogen storage Mg LPSO TiO_(2)@C Synergistic catalysis

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Additive manufacturing of Cu-AI-Mn shape memory alloy with enhanced superelasticity

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Rare Metals 2023年第12期42卷 4234-4245页

作者： Meng-Wei Wu Zhuo-Fan Hu Bing-Bing Yang Ying Tao Rui-Ping Liu Chun-Mei Ma Lei Zhang Department of Materials Science and Engineering China University of Mining&Technology(Beijing)Beijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Department of Mechanical Engineering University of Alaska FairbanksFairbanks 99775-5905USA

The Cu-based shape memory alloy(SMA)with highly oriented columnar crystals is an ideal candidate for the commercial application,especially the ones obtained through rapid cooling via additive manufacturing *** this work,Cu_(71)Al_(18)Mn_(11)(at%)shape memory alloy with strong<001>texture columnar grains was successfully prepared by selective laser melting(SLM).An L27(313)orthogonal array was designed to systematically investigate the effects of laser power,scanning speed,scanning spacing,layer thickness and their interactions on the forming quality of Cu_(71)Al_(18)Mn_(11)***_(71)Al_(18)Mn_(11)alloys with density of 7.3204 g·cm^(-3)and relative density of 99.18%were successfully prepared when the laser power,scanning speed,scanning distance and layer thickness were 240 W,1000 mm·s^(-1),0.11 mm and 25μm,the transformation onset temperature(Ms),martensite phase transformation termination temperature(Mf),austenite phase transformation onset temperature(AS)and austenite phase transformation termination temperature(Af)are-21.84,-26.04,-15.75 and-12.36℃,*** compression strength and fracture strain along the building direction(BD)were significantly superior to the scanning direction(SD),while the superelasticity of compression along the SD reached 2.50%,which was better than that of2.32%along *** mechanical property and superelasticity anisotropy due to the formation of columnar grains and texture were *** study shows that SLM is a proposed method for the preparation of Cu-Al-Mn SMAs with high superelasticity,which provides a new strategy for enhancing the shape memory alloy superelasticity.

关键词： Shape memory alloy(SMA) Selective laser melting(SLM) Columnar grains Superelasticity properties

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Constructing quasi-vertical fiber bridging behaviors of aramid pulp at interlayer of laminated basalt fiber reinforced polymer composites to improve flexural performances

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Chinese Journal of Aeronautics 2023年第12期36卷 477-488页

作者： Guangming YANG Fei CHENG Shihao ZUO Jinheng ZHANG Yang XU Yunsen HU Xiaozhi HU Yong WEI Guangjun GOU School of Materials and Chemistry Southwest University of Science and TechnologyMianyang 621010China Engineering Research Center of Biomass Materials Ministry of EducationSouthwest University of Science and TechnologyMianyang 621010China School of Mechanical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Department of Mechanical Engineering University of Western AustraliaPerth WA 6009Australia

Basalt Fiber Reinforced Polymer(BFRP)composites have huge potential application respects for some civil fields due to enough strength/modulus to weight and low cost by replacing carbon fiber *** at the issues in the Resin-Rich Region(RRR)and Interfacial Transition Region(ITR)of fiber reinforced polymer composites,the characteristic Aramid Pulp(AP)fibers with micro-fiber trunk and nano-fiber branches were manufactured into multiple non-woven ultra-thin interleaving at the interlayers of BFRP composites via compression molding to reinforce the flexural strengths and elastic *** fibers were introduced into RRR to form interleaving at the interlayer,the brittle epoxy adhesive layer was improved and enabled to avoid cracking under a low external *** fiber branches of AP were also embedded into BF layer to construct quasi-vertical fiber bridging behaviors in ITR,stronger mechanical interlocking was created to prevent crack propagation along the bonding interface of BF/***-point bending testing results showed the interleaving film with 4 g/m^(2)AP exhibited the best effect among various areal densities and yielded average 315.75 MPa in flexural strength and 21.38 GPa in elastic modulus,having a 63.4%increment and a 47.1%increment respectively compared with the ***,the simple and low-cost AP interleaving is confirmed as an effective method in improving interlayer structure and flexural performance of BFRP composites,which may be considered to manufacture high-performance laminated fiber reinforced polymer composites in civil aviation industry.

关键词： Basalt fiber reinforced polymer Aramid pulp fiber Resin-rich region Interfacial transition region Quasi-vertical fiber bridging behavior Flexural performance improvement

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The vital application of rare earth for future high-performance electromagnetic wave absorption materials:A review

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Journal of materials science & Technology 2024年第9期176卷 188-203页

作者： Jing Qiao Lutong Li Jiurong Liu Na Wu Wei Liu Fan Wu Zhihui Zeng Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China School of Mechanical Engineering Shandong UniversityJinan 250061China Department of Chemistry and Applied Biosciences ETH ZurichCH-8093 ZurichSwitzerland State Key Laboratory of Crystal Materials Shandong UniversityJinan 250061China School of Mechanical Engineering Nanjing University of Science&TechnologyNanjing 210094China

Rare earth(RE)takes an irreplaceable role in various fields,especially the high-tech electronics industry,which is usually comparable to the vitamin of *** the development of electromagnetic wave(EMW)absorption materials,the participation of RE makes a significant contribution as well,and great progress has been *** researches have illuminated that the strategy of both doping RE elements and constructing RE oxide composites exhibited huge potential for the fabrication of high-efficiency EMW absorption *** believe a systematic summary will be highly desired for a comprehensive understanding and future *** this review,we first summarized the research background,basic principles,and mechanisms of EMW ***,we classify the RE EMW absorption materials into RE-doped ferrites,RE-transition metal intermetallics,RE oxides,and other categories,view their current progress by typical studies,and expound their respective features,strengths,weaknesses,and absorption ***,the current challenges and future outlook of RE EMW absorption materials are highlighted,in the hope of guidance for a sound future development.

关键词： Rare earth Electromagnetic wave absorption Composite Rare earth oxide

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Recycling of Magnesium Alloy Using the Gravity-Driven Multiple-Effect Thermal System (G-METS)

Recycling of Magnesium Alloy Using the Gravity-Driven Multip...

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Magnesium Technology Symposium held at the TMS Annual Meeting and Exhibition, 2024

作者： Mc Arthur Sehar, Daniel Telgerafchi, Armaghan Ehsani Iurkovskyi, Artem Opoku, Emmanuel Powell, Adam Materials Science and Engineering Program Department of Mechanical Engineering Worcester Polytechnic Institute WorcesterMA United States Department of Mechanical Engineering Worcester Polytechnic Institute WorcesterMA United States

ISBN: (纸本)9783031502392

MagnesiumMagnesium metal has been significantly used in commercial applications from automobiles to aluminum alloys to defense weaponry. The surge in structural usage of magnesium over the past years has been due to high strength and excellent stiffness-to-weight ratio. RecyclingRecycling magnesium scrap is a crucial aspect of the sustainability of the economy and environmental welfare. G-METS is an advanced distillationDistillation system used in the conversion of low-grade magnesium scrap into high-purityHigh-purity magnesium metal. This multiple-effect system uses the weight of magnesiumMagnesium as a compressor, to build pressure differences between each effect of the condenser-evaporator, modifying boiling points, and enabling transfer of vaporization enthalpy. This system is exceptionally efficient compared to the energy-intensive conventional distillationDistillation technique. This study compares experiments and models of one- and two-effect distillers. © The Minerals, Metals & materials Society 2024.

关键词： Magnesium alloys

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Tertiary orientation structures enhance the piezoelectricity of MXene/PVDF nanocomposite

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Nano Research 2024年第6期17卷 5629-5635页

作者： Yong Ao Tao Yang Guo Tian Shenglong Wang Tianpei Xu Lin Deng Jieling Zhang Lihua Tang Weili Deng Long Jin Weiqing Yang Key Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Department of Mechanical Engineering The University of AucklandAuckland 1010New Zealand Research Institute of Frontier Science Southwest Jiaotong UniversityChengdu 610031China

With the increasing demand for flexible piezoelectric sensor components,research on polyvinylidene fluoride(PVDF)based piezoelectric polymers is mounting ***,the low dipole polarization and disordered polarization direction presented in PVDF hinder further improvement of piezoelectric ***,we constructed an oriented tertiary structure,consisting of molecular chains,crystalline region,and MXene sheets,in MXene/PVDF nanocomposite via a temperature-pressure dual-field regulation *** highly oriented PVDF molecular chains form approximately 90%of theβ*** addition,the crystalline region structure with long-range orientation achieves out of plane polarization *** parallel orientation arrangement of MXene effectively enhances the piezoelectric performances of the nanocomposite,and the current output of the device increases by nearly 23 *** high output device is used to monitor exercise action,exploring the potential applications in wearable electronics.

关键词： flexible sensor piezoelectric MXene/polyvinylidene fluoride(PVDF)nanocomposite orientation structures

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Progress of laser cleaning technology from the perspective of Chinese patents

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Frontiers of mechanical engineering 2024年第6期19卷 113-138页

作者： Zhe LI Wanqing ZHENG Sijie WANG Yingjie WANG Yaokun PAN School of Materials Science and Engineering Shandong University of TechnologyZibo 255000China National Engineering Research Center for Mechanical Product Remanufacturing Army Academy of Armored ForcesBeijing 100072China School of Mechanical Engineering Shandong University of TechnologyZibo 255000China

Laser cleaning technology has emerged as a rapidly developing high-tech surface engineering technology in recent *** is considered the most promising green cleaning technology in the 21st century,and related patent applications exhibit an explosive growth *** study summarizes the overall trend of patent applications in laser cleaning in China,with a focus on systematically analyzing patents related to cleaning different substrates and coatings,cleaning equipment,and processes over the past 6 *** main characteristics of the growth trend,institutional attributes,regional distribution,and type proportion of laser cleaning patent applications in China are *** patent application characteristics of laser cleaning for different substrate materials and coatings are *** progress in research and development of laser cleaning equipment,cleaning terminals,and monitoring devices is outlined,while potential for maintaining substrate surface integrity and achieving surface functionalization through laser cleaning is *** for improvement in laser cleaning are determined to support the innovative development of laser cleaning technology.

关键词： laser cleaning patent analysis equipment development trend analysis surface functionalization

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Investigating and Mitigating Failure Modes in Physics-Informed Neural Networks(PINNs)

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Communications in Computational Physics 2023年第5期33卷 1240-1269页

作者： Shamsulhaq Basir Mechanical Engineering and Materials Science Department at the University of Pittsburgh PittsburghPA 15261USA

This paper explores the difficulties in solving partial differential equations(PDEs)using physics-informed neural networks(PINNs).PINNs use physics as a regularization term in the objective ***,a drawback of this approach is the requirement for manual hyperparameter tuning,making it impractical in the absence of validation data or prior knowledge of the *** investigations of the loss landscapes and backpropagated gradients in the presence of physics reveal that existing methods produce non-convex loss landscapes that are hard to *** findings demonstrate that high-order PDEs contaminate backpropagated gradients and hinder *** address these challenges,we introduce a novel method that bypasses the calculation of high-order derivative operators and mitigates the contamination of backpropagated ***,we reduce the dimension of the search space and make learning PDEs with non-smooth solutions *** method also provides a mechanism to focus on complex regions of the ***,we present a dual unconstrained formulation based on Lagrange multiplier method to enforce equality constraints on the model’s prediction,with adaptive and independent learning rates inspired by adaptive subgradient *** apply our approach to solve various linear and non-linear PDEs.

关键词： Constrained optimization Lagrangian multiplier method Stokes equation convection equation convection-dominated convection-diffusion equation heat transfer in composite medium Lid-driven cavity problem

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Advanced electrospinning nanomaterials:From spinning fabrication techniques to electrochemical applications

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Nano Research 2024年第8期17卷 7077-7116页

作者： Jie Zhang Miao Yu Shuhui Tao College of Materials Science and Engineering Sichuan UniversityChengdu 610065China School of Mechanical Engineering Sichuan UniversityChengdu 610065China National University of Singapore(Chongqing)Research Institute Chongqing 401123China

Fuel cells,rechargeable metal–air batteries,metal-ion batteries,and supercapacitors have been regarded as prospective energy sources technologies to replace the fossil ***,electrochemical sensors also have been successfully developed as promising platforms for detecting pollutants,drug analysis,and healthcare *** is a scalable and suitable technique to design and fabricate diverse nanofibers and their nanocomposites for key components in electrochemical ***,a comprehensive review of electrospinning,from the technological innovations to the novel electrospun composite nanofibers,is *** importantly,the recent advances on the diverse components of electrochemical devices are highlighted,followed with the detailed discussion about the corresponding enhancement mechanism based on the electrospun ***,the currently faced challenges on the fabrication of electrospun nanomaterials are raised and a brief perspective for the future development of electrospun nanomaterials-based electrochemical applications is prospected.

关键词： electrospinning carbon nanofibers metal-organic frameworks electrode materials electrochemical applications

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