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Microstructural evaluation of Hastelloy-X transient liquid phase bonded joints:Effects of filler metal thickness and holding time

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Transactions of Nonferrous Metals Society of China 2022年第5期32卷 1548-1558页

作者： A.MALEKAN S.E.MIRSALEHI M.FARVIZI N.SAITO K.NAKASHIMA Ceramic Division Materials and Energy Research CenterP.O.Box 14155-4777TehranIran Department of Materials and Metallurgical Engineering Amirkabir University of Technology(Tehran Polytechnic)Tehran 15875-4413Iran Department of Materials Science and Engineering Kyushu University744MotookaNishi-kuFukuoka 819-0395Japan

Transient liquid phase(TLP)bonding was investigated in Hastelloy-X samples with different filler metal thicknesses(20,35,50,65,and 100μm)and holding time(5,20,80,320,and 640 min)to obtain optimum bonding *** evaluations using electron probe microanalysis(EPMA)and electron backscattered diffraction(EBSD)show that the central eutectic phases present in the athermally solidified zone(ASZ)are Ni_(3)B,Ni_(2)Si,and CrB,and the precipitates formed in the diffusion-affected zone(DAZ)are MoB,CrB_(2),and Mo_(2)B_(5).According to the results,decreasing the filler thickness as well as increasing the holding time helps realize the completion of isothermal solidification and reduction in the density of precipitates in the DAZ,leading to a joint with more uniform *** of boron and silicon to longer distances with increasing holding time causes the removal of Cr-rich borides in the DAZ and the formation of Mo-rich silicide at the joint *** in hardness of ASZ and DAZ due to the elimination of brittle phases in these zones during long holding time causes more uniform hardness distribution in the joint *** best results are obtained for the sample joined with the 35μm-thick filler metal for 640 min holding time.

关键词： Hastelloy-X transient liquid phase(TLP)bonding microstructure filler metal electron probe microanalysis(EPMA) electron backscattered diffraction(EBSD)

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Two-Dimensional Ultra-Thin Cuconimnal High-Entropy Alloy Nanosheets for Lithium-Ion Storage and Oxygen Evolution Reaction

SSRN

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SSRN 2024年

作者： Zhu, Xingqun Li, Jing Ali, Rai Nauman Song, Ming School of Materials and Chemical Engineering Xuzhou University of Technology Jiangsu Xuzhou221018 China Engineering Technology Center Department of Education of Anhui Province College of Chemistry and Materials Engineering Engineering Research Center of High-frequency Soft Magnetic Materials and Ceramic Powder Materials of Anhui Province Chaohu University Hefei238024 China School of Materials Science and Engineering Jiangsu University Jiangsu Zhenjiang212013 China

High entropy alloys (HEAs) are a new class of materials. Utilization of the HEAs concept in the fabrication of sophisticated functional materials has the potential to achieve highly effective energy storage and conversion. In this work, we have successfully fabricated a two-dimensional ultra-thin nanosheet structure of CuCoNiMnAl high-entropy alloy (HEA) utilizing a simple salt-templated method, marking the first instance of such synthesis. The findings indicate that the inclusion of sodium chloride can proficiently enhance the development of a nanosheet configuration, while the distinct variations in annealing temperature impact the characteristics of the substances. As an illustrative instance, the CuCoNiMnAl high-entropy alloy nanosheets, which have undergone annealing at a temperature of 800°C, demonstrate exceptional characteristics in terms of lithium-ion storage and electrocatalytic capabilities for the oxygen evolution reaction (OER). These nanosheets possess a reversible capacity of approximately 700 mAhg-1 at 100 mA g-1 after 80 cycles, along with a low overpotential of 390 mV at a current density of 10 mA cm-2 for OER. Additionally, they exhibit long-term durability in electrochemical performance, with only negligible decay in an alkaline environment. Our work provides a new idea for the design and application of novel HEAs in the field of energy. © 2024, The Authors. All rights reserved.

关键词： Aluminum alloys

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Prediction of Weather Patterns Using Linear Angstrom Model

Prediction of Weather Patterns Using Linear Angstrom Model

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2022 Advances in science and engineering Technology International Conferences, ASET 2022

作者： Aljaghoub, Haya Alashkar, Adnan Alami, Abdul Hai Tawalbeh, Muhammad University of Sharjah Department of Industrail Engineering and Engineering Management Sharjah United Arab Emirates American University of Sharjah Materials Science and Engineering PhD Program Sharjah United Arab Emirates University of Sharjah Department of Sustainable and Renewable Energy Engineering Sharjah United Arab Emirates

ISBN: (纸本)9781665418010

The paper investigates the correlation between solar irradiance and sunlit hours for the city of Sharjah, United Arab Emirates. This correlation is a strong function of the weather conditions, and is vital for the design and operation of solar energy systems. The Angstrom Model is a straightforward tool that establishes a linear relationship where the model parameters b and a (slope and y-intercept, respectively) are evaluated through plotting of experimental measurements. Wind speed and relative humidity are collected to interpret their effect on the quality of incident solar radiation. The model takes into consideration winter and summer months of the year 2021, hence it provides a complete weather pattern for the year. With continuous data logging, the model will be developed to predict the weather patterns of the city of Sharjah. © 2022 IEEE.

关键词： Solar energy

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3D Magnetization Reconstruction for Lorentz Microscopy using Differential programming

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1756-1757页

作者： McCray, Arthur R C Cherukara, Mathew Petford-Long, Amanda K. Phatak, Charudatta Materials Science Division Argonne National Laboratory Lemont IL United States Applied Physics Program Northwestern University Evanston IL United States Advanced Photon Source Argonne National Laboratory Lemont IL United States Department of Materials Science and Engineering Northwestern University Evanston IL United States

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Optothermally Assembled Nanostructures

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Accounts of materials Research 2021年第5期2卷 352-363页

作者： Jingang Li Yuebing Zheng Materials Science&Engineering Program Texas Materials Instituteand Walker Department of Mechanical EngineeringThe University of Texas at AustinAustinTexas 78712United States

CONSPECTUS:Nanofabrication is one of the core techniques in rapidly evolving nanoscience and *** top-down nanofabrication approaches such as photolithography and electron beam lithography can produce high-resolution nanostructures in a robust ***,these methods usually involve multistep processing and sophisticated instruments and have difficulty in fabricating three-dimensional complex structures of multiple materials and ***,bottom-up techniques have emerged as promising alternatives to fabricating nanostructures via the assembly of individual building *** comparison to top-down lithographical methods,bottom-up assembly features the on-demand construction of superstructures with controllable configurations at single-particle *** size,shape,and composition of chemically synthesized building blocks can also be precisely tailored down to the atomic scale to fabricate multimaterial architectural structures of high *** techniques have been reported to assemble individual nanoparticles into complex structures,such as self-assembly,DNA nanotechnology,patchy colloids,and optically controlled *** them,the optically controlled assembly has the advantages of remote control,site-specific manipulation of single components,applicability to a wide range of building blocks,and arbitrary configurations of the assembled *** this Account,we provide a concise review of our contributions to the optical assembly of architectural materials and structures using discrete nanoparticles as the building *** exploiting entropically favorable optothermal conversion and controlling optothermal−matter interactions,we have developed optothermal assembly techniques to manipulate and assemble individual *** techniques can be operated both in solution and on solid ***,we discuss the opto-thermoelectric assembly(OTA)of colloidal particles into superstructures by co

关键词： structures architectural printing

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Recent advances in electronic devices for monitoring and modulation of brain

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Nano Research 2021年第9期14卷 3070-3095页

作者： Yong Won Kwon Yoon Sun Jun Young-Geun Park Jiuk Jang Jang-Ung Park Nano Science Technology Institute Department of Materials Science and EngineeringYonsei UniversitySeoul 03722Republic of Korea Center for Nanomedicine Institute for Basic Science(IBS)Seoul 03722Republic of Korea Graduate Program of Nano Biomedical Engineering(NanoBME) Advanced Science InstituteYonsei UniversitySeoul 03722Republic of Korea

The brain is actuated by billions of neurons with trillions of interconnections that regulate human *** the mechanisms of these systems that induce sensory reactions and respond to disease remains one of the greatest challenges in science,engineering,and *** advances in nanomaterials and nanotechnologies have led to the extensive research of electronic devices for brain interfaces to better understand the neural activities of the brains complex nervous *** development of sensor devices for monitoring the physiological signals of the brain related to traumatic injury status has accompanied by the progress of electronic neural probes in *** addition,these neurological and stereotactic surgical revolutions hold immense potential for clinical analysis of pharmacological systems within cerebral ***,we review the progress of electronic devices interfacing with brain in terms of the materials,fabrication technologies,and device *** activity can be measured and modulated by brain probes based on newly developed nanofabrication ***,in vivo pathological monitoring of the brain and pharmacological assessment has been developed in miniaturized and wireless *** also consider the key challenges and prospects for further development,and explore the future directions emerging in the latest research.

关键词： neural interfaces neural recording neuromodulation intracranial pressure monitoring microfluidic drug delivery

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Autonomous Burrowing and Retrieval of Soft Robotic Anchors in Granular Media

Autonomous Burrowing and Retrieval of Soft Robotic Anchors i...

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IEEE International Conference on Soft Robotics (RoboSoft)

作者： Dongting Li Michael T. Tolley Nick Gravish Department of Mechanical and Aerospace Engineering University of California San Diego (UCSD) CA USA Materials Science and Engineering Program University of California San Diego CA USA

ISBN: (数字)9798331520205

ISBN: (纸本)9798331520212

Vertical digging into and out of granular media is a challenging task for autonomous systems. Granular media present considerable resistance to vertical penetration due to the high friction forces and large pressure at depths. In this paper, we present a soft robot that is capable of digging into and out of granular media to depths over 10× its body length. Our robot incorporates a vibration motor to locally fluidize the granular media for burrowing, and a soft pneumatic actuator to adjust the volume and hence the density of the robot, allowing it to transition from digging down to digging up. To analyze the performance of the robot, we measure its weight and density, track its location using a motion capture system, and investigate the effect of local fluidization. When the robot is buried and inflated with vibration turned off, it can increase its passive anchoring force by 5.22× (up to 35 N) relative to when the robot is deflated with vibration on. By contrast, by inflating the soft pneumatic bladder and providing vibration the robot is able to actively unburrow.

关键词： Vibrations Weight measurement Pneumatic actuators Tracking Pneumatic systems Media Soft robotics Motors Motion capture Immune system

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Design of Quantum Dot Color Convertors for Inkjet-Printed Optoelectronic Devices: Violet-Converted Full Color Mini-LED

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Advanced materials Technologies 2024年第3期9卷

作者： Lin, Chen-Te Zhuan, Yi-long Jung, Nian-Ting Hoang, Minh-Son Chen, Hsueh-Shih Ph.D. Program in Prospective Functional Materials Industry College of Engineering National Tsing Hua University Hsinchu30013 Taiwan Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan College of Semiconductor Research National Tsing Hua University Hsinchu30013 Taiwan Department of Chemical Engineering & Materials Science College of Engineering Yuan Ze University Taoyuan32003 Taiwan

This study presents a strategy of design and development of inkjet-printable and UV-curable quantum dot (QD) polymer-based inks and color conversion (CC) film for use in optoelectronic devices. At first, the preparation of a QD ink is focused on two key aspects, that are QD chemical compatibility and ink printability. In the hybrid organic–inorganic polymer/QDs system, it must be formulated to a well-dispersed ink, in which a dispersant additive without negative effect on QDs is introduced to enhance the QD suspension. As the optical density of final dried QD film is one of the most critical concerns in color conversion, QD concentration should be as high as possible in the ink, which increases the ink viscosity. Consequently, a trade-off between QD concentration and the ink viscosity associated with the ink-jetting temperature is considered to ensure the ink printability. Finally, the designed QD ink is printed as color conversion film on a mini-LED panel composed of two violet mini-chips to produce red and green emissions, while blue emission directly comes from a blue mini-chip. The final conversion efficiency of QDCC on mini-LED panel are between 35% and 45%, showing the promising applications in optoelectronic devices. © 2023 Wiley-VCH GmbH.

关键词： Semiconductor quantum dots

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Low-loss, nonvolatile tuning of Bragg structures with Sb2Se3

Low-loss, nonvolatile tuning of Bragg structures with Sb2Se3

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CLEO: Applications and Technology in CLEO 2024, CLEO: A and T 2024 - Part of Conference on Lasers and Electro-Optics

作者： Nobile, Nicholas A. Lian, Chuanyu Sun, Hongyi Huang, Yi-Siou Mills, Brian Popescu, Cosmin Constantin Callahan, Dennis Hu, Juejun Ríos Ocampo, Carlos A. Youngblood, Nathan Electrical & Computer Engineering Department University of Pittsburgh PittsburghPA15213 United States Department of Materials Science & Engineering University of Maryland College ParkMD20742 United States Institute for Research in Electronics and Applied Physics University of Maryland College ParkMD20742 United States Department of Materials Science & Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Draper Scholar Program The Charles Stark Draper Laboratory Inc. CambridgeMA02139 United States The Charles Stark Draper Laboratory Inc. CambridgeMA02139 United States

Sb2Se3 is used to switch between broadband transparency and enhanced index contrast in two device types leveraging Bragg gratings for tunable stop- and pass-band functionalities. Experimental results highlight fabrication challenges and efficacy of the designs. © Optica Publishing Group 2024, © 2024 The Author(s)

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Creep-recovery deformation of 304 stainless-steel springs under low forces

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Mechanics of materials 2024年 193卷

作者： Tsai, Ming-Yen Chang, Shou-Yi Zhang, Yulin Yang, Fuqian Lee, Sanboh Department of Materials Science and Engineering National Tsing Hua University Hsinchu300 Taiwan Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing400714 China Materials Program Department of Chemical and Materials Engineering University of Kentucky LexingtonKY40506 United States

The deformation behavior of materials at high temperatures determines the structural stability of mechanical structures under high-temperature service conditions. In this work, we prepare helical springs from 304 stainless-steel wires and study creep-recovery deformation of the helical springs under small forces at temperatures of 475–575 °C. In contrast to most methods reported in the literature, we use Kelvin representation of the Burgers model with a nonlinear dashpot in series connection to analyze the creep-recovery deformation of the helical springs and suggest the deformation mechanisms of the diffusion of interstitial atoms and dislocation generation/annihilation in transient creep and recovery of the helical springs under small forces. For the creep deformation, the stress exponent and activation energy for the plastic flow of the nonlinear dashpot are 2 and 57.8 kJ/mol, respectively, and the activation energy for the deformation flow of the linear dashpot is 41.8 kJ/mol. The nonlinear dashpot does not play any role in the recovery deformation, and the formation energy of defects for the recovery deformation of the helical springs is 51.4 kJ/mol. The approach used in this work provides a simple method to use a phenomenological model with a nonlinear dashpot to capture the power-law creep deformation of metallic materials. © 2024

关键词： Activation energy

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