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Significant Improvement in Tensile Shear Properties of Friction Stir Lap Welded Nano Tib2/2024 Al Composite Joints Via a Novel Tool Pin Geometry Design

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SSRN 2024年

作者： Chen, Shuai Niu, Pengliang Fu, Xurong Li, Yongbing Ke, Liming Huang, Yongxian School of Aeronautical Manufacturing Engineering Nanchang Hangkong University Jiangxi Nanchang330063 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin15000 1 China COMAC Shanghai Aircraft Manufacturing Co. Ltd. Shanghai200436 China Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures China

A novel designed tool pin with two shoulders and pins (stepped pin, S-pin) was performed to fabricate the friction stir lap welded nano TiB2/2024 Al composite joints for the interface migration optimization and tensile shear strength improvement purposes. Compared with the conventional tapered pin (T-pin) joints, broken and dispersedly distributed hook, significantly restrained cold lap were observed in the S-pin joints. Submicron or hundreds of nanometers grains were detected in the stir zone (SZ), which should be attributed to the existence of nano TiB2 hindering the movement of grain boundaries and limiting the growth of recrystallized grains. A wedge shaped microhardness distributions of the S-pin joints were found, which would be better for the joint bearing capacity. Tensile shear loads of the S-pin joints were much higher than those of the T-pin joints. The optimal average tensile shear strength, 7.3 KN or 484 N/mm, were obtained when the S-pin was performed, dominantly fracturing in the heat affected zone (HAZ) rather than the SZ. © 2024, The Authors. All rights reserved.

关键词： Microstructural evolution

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The Electrochemical Performance and Microstructure Evolution of an All-Solid-state Lithium Battery Prepared by Spark Plasma Sintering

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SSRN 2023年

作者： Li, Jianghao Liu, Jian Tong, Huan Zhou, Wenjiao Song, Xiping State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China School of Engineering Faculty of Applied Science University of British Columbia KelownaBCV1V 1V7 Canada

The 30%LiFePO4-55%Li1.5Al0.5Ge1.5(PO4)3-15%C| Li1.5Al0.5Ge1.5(PO4)3|Li all-solid-state lithium batteries are successfully prepared by spark plasma sintering (SPS) technology, and the electrochemical performance and the microstructure evolution after the 10, 67, and 157 cycles are investigated. The results show that the all-solid-state lithium batteries prepared by SPS have excellent electrochemical properties with an initial discharge-specific capacity exceeding 150 mAh·g-1 and good repeatability. In the first 80 electrochemical cycles, the battery exhibits stable charge and discharge properties. After 80 electrochemical cycles, the battery experiences severe capacity attenuation, and the battery impedance also increases with the increase of cycles. The SEM observation indicates that cracks appear in the surface and interior, parallel or perpendicular to the interface of the electrode and solid electrolyte, and the number of cracks increases with the increase of electrochemical cycles, eventually leading to the battery's collapse. The interface between the solid electrolyte and anode occurs a serious reaction and forms a SEI layer. The SEI layer comprises Li2CO3, LiF, and LiTFSI and extends along the crack to the cathode electrode as dendrites. Based on the microstructure evolution of an all-solid-state lithium battery during electrochemical cycling, the failure mechanism of the battery is discussed. © 2023, The Authors. All rights reserved.

关键词： Spark plasma sintering

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Precise fault location method of traveling wave in distribution grid based on multiple measuring point 4

Precise fault location method of traveling wave in distribut...

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4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

作者： Li, Peng Liu, Xiangyu Yuan, Zhiyong Chen, Wei Yu, Li Xu, Quan Lin, Yuehuan Electric Power Research Institute CSG Distribution Department Guangzhou China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728196060

Aiming at the problems existing in the current fault location methods of distribution grid, such as precise calculation of wave velocity and the finite precision of fault location, a precise fault location method of traveling wave in the distribution grid based on multiple measuring points is proposed. In this method, the line-mode traveling wave of a specific frequency is selected as the basis for the time calibration of the initial wave head, and the circuit is divided into fault zone and non-fault zone. The traveling wave velocity is real time calculated by using the traveling wave of the non-fault zone. The fault branch identification matrix (FBIM) is constructed and compared with the fault branch identification array line by line to identify the fault branch (FB). On this basis, the fault distance is solved precisely by using redundant end-point traveling wave and least square method. This method only requires the placement of measuring points at the end of each branch, which to some extent solves the problem of limitation of measuring point allocation. Simulation results show that the method is highly reliable and has high fault location accuracy in different fault locations. © 2020 IEEE.

关键词： Least squares approximations

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MOFs-Bbased Materials for Solid-state Hydrogen Storage: Strategies and Perspectives

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Chemical engineering Journal 2024年 485卷

作者： Li, Yuting Guo, Qifei Ding, Zhao Jiang, Han Yang, Hang Du, Wenjia Zheng, Yang Huo, Kaifu Shaw, Leon L. The State Key Laboratory of Refractories and Metallurgy Institute of Advanced Materials and Nanotechnology Wuhan University of Science and Technology Wuhan430081 China College of Materials Science and Engineering National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing400044 China Department of Engineering Science University of Oxford OxfordOX1 3PJ United Kingdom Department of Mechanical Materials and Aerospace Engineering Illinois Institute of Technology Chicago60616 United States

Exceptionally porous crystals with ultrahigh adsorption capacities, metal–organic frameworks (MOFs), have received recognition as leading candidates for the promotion of solid-state hydrogen storage. MOFs are compelling adsorbents given their impressive uptake under stringent cryogenic and high-pressure conditions for physisorption. The use of high-throughput screening to rapidly identify potential candidates, the understanding of structure–property correlations through molecular simulations, and the use of machine learning to predict material properties offer a more efficient approach to meeting these stringent operational constraints. Furthermore, the open metal sites and customizable pore structures act make MOFs as catalysts or nanoconfinement matrices, facilitating enhancements in the thermodynamics and kinetics of reactive chemical hydrides. Strategically harnessing the tunability of MOFs could unlock vast, untapped potential for enabling high-density, reversible hydrogen storage under real-world conditions, aligned with sustainability needs. This review establishes MOFs as an innovative platform in solid-state hydrogen storage by intertwining material discovery with engineering principles. The comprehensive analysis and consolidation of the research provides new perspectives to broaden the scope of the investigation and drive the widespread deployment and development of hydrogen energy. © 2024 Elsevier B.V.

关键词： Catalysis

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Regulation of extracellular bioactive cations in bone tissue microenvironment induces favorable osteoimmune conditions to accelerate in situ bone regeneration

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Bioactive Materials 2021年第8期6卷 2315-2330页

作者： Zhengjie Lin Danni Shen Weixiao Zhou Yufeng Zheng Tiantian Kong Xuanyong Liu Shuilin Wu Paul K.Chu Ying Zhao Jun Wu Kenneth M.C.Cheung Kelvin W.K.Yeung College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen518060China Department of Orthopaedics and Traumatology The University of Hong KongHong KongChina Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing100871China Shenzhen Key Laboratory for Innovative Technology in Orthopaedic Trauma The University of Hong Kong Shenzhen Hospital1 Haiyuan 1st RoadFutian DistrictShenzhenChina Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging Department of Biomedical EngineeringSchool of MedicineShenzhen UniversityShenzhen518060China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China School of Materials Science&Engineering the Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of ChinaTianjin UniversityTianjin300072China Department of Physics Department of Materials Science and EngineeringCity University of Hong KongTat Chee AvenueKowloonHong KongChina Centre for Human Tissues and Organs Degeneration Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen518055China State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing210096China

The design of orthopedic biomaterials has gradually shifted from“immune-friendly”to“immunomodulatory,”in which the biomaterials are able to modulate the inflammatory response via macrophage polarization in a local immune microenvironment that favors osteogenesis and implant-to-bone *** the well-known effects of bioactive metallic ions on osteogenesis,how extracellular metallic ions manipulate immune cells in bone tissue microenvironments toward osteogenesis and subsequent bone formation has rarely been ***,we investigate the osteoimmunomodulatory effect of an extracellular bioactive cation(Mg^(2+))in the bone tissue microenvironment using custom-made poly lactic-co-glycolic acid(PLGA)/MgO-alendronate microspheres that endow controllable release of magnesium *** results suggest that the Mg^(2+)-controlled tissue microenvironment can effectively induce macrophage polarization from the M0 to M2 phenotype via the enhancement of anti-inflammatory(IL-10)and pro-osteogenic(BMP-2 and TGF-β1)cytokines *** also generates a favorable osteoimmune microenvironment that facilitates the proliferation and osteogenic differentiation of bone marrow mesenchymal stem *** in vivo results further verify that a large amount of bony tissue,with comparable bone mineral density and mechanical properties,has been generated at an early post-surgical stage in rat intramedullary bone defect *** study demonstrates that the concept of in situ immunomodulated osteogenesis can be realized in a controlled magnesium tissue microenvironment.

关键词： Bone regeneration Osteoimmunomodulatory property Osteoimmune environment Macrophage polarization Magnesium ions

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A Bi-level Programming Guiding Electrolytic Aluminum Load for Demand Response

A Bi-level Programming Guiding Electrolytic Aluminum Load fo...

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2020 IEEE/IAS Industrial and Commercial Power System Asia, I and CPS Asia 2020

作者： Zeng, Kaiwen Wang, Haizhu Liu, Jianing Dong, Chao Lan, Xinbin Wang, Chenglong Le, Lingling Ai, Xiaomeng Guangdong Power Grid Power Dispatch Control Center Guangzhou China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728143033

The electrolytic aluminum accounts for about 7% of China's total electricity use and has great potential for demand-side response (DR) with smart grid technologies. This paper focuses on the optimal scheduling of the electrolytic aluminum with DR function. The bi-level optimization model is proposed to guide electrolytic aluminum load for providing DR. In the proposed optimization model, the upper-level problem is to minimize the system operational cost, while the lower-level problem is to maximize the profit of the aluminum plant. The Karush-Kuhn-Tucker optimality conditions for the lower-level problem is derived, and the bi-level problem is reformulated as the mix-integer quadratic programming problem. The simulation results demonstrate that the proposed bi-level programming can not only reduce the operational cost of the power system, but also increase the profit of the electrolytic aluminum plant when it provides DR services. © 2020 IEEE.

关键词： Aluminum plants

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Integrated Modeling and Analysis of PEMFC based on Model Parameters Identification

Integrated Modeling and Analysis of PEMFC based on Model Par...

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Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Zigan Xu Qi Chen Wuhan National High Magnetic Field Center and the State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665400657

Based on mechanism analysis of proton exchange membrane fuel cell (PEMFC), a semi mechanism and semi empirical steady-state simplified model is established by adopting reasonable and necessary assumptions, which helps the study of fuel cell polarization curves. Taking external conditions such as temperature, pressure and current density as variables, the model identifies fitting parameters by linear regression according to the experimental data, which proves its strong universality and generalization ability. In order to further study the output characteristics of PEMFC, a dynamic model is established in Matlab/Simulink to reflect the changes of output voltage and internal gas components. Considering different operating conditions and current requirements, the model is conductive to optimizing the structural design of the PEMFC, improving its operating performance and developing a real time control system.

关键词： Analytical models Temperature distribution Heuristic algorithms Fitting Linear regression Fuel cells Control systems

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Modeling and HIL Test of a D-PMSG Connected to Power System with Damping Control for Real Time Studies

Modeling and HIL Test of a D-PMSG Connected to Power System ...

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IEEE Asia Power and Energy engineering Conference (APEEC)

作者： Jue Hou Zhou Liu Shaorong Wang Zhe Chen The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China Aalborg University Aalborg Denmark

Since increasing renewable sources are integrated to power system, dynamic behavior of power system turns complicated. This paper proposes a detailed direct-driven wind permanent magnet synchronous generator (D-PMSG) connected to power system simulation structure that combines Real Time Digital Simulator (RTDS) and an additional control device in LabVIEW using discretization to implement the control hardware-in-the-loop (CHIL) simulation. Feasibility demonstration of RTDS model using large-and-small time step are demonstrated in real time simulation. Control effect optimization of damping method is conducted based on case studies in CHIL testing.

关键词： Damping Computational modeling Power system dynamics Transfer functions Wind power generation Real-time systems Mathematical model

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Microwave reflectometer for density measurement on J-TEXT tokamak 1

Microwave reflectometer for density measurement on J-TEXT to...

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1st IEEE China International Youth Conference on Electrical engineering, CIYCEE 2020

作者： Ren, Xiehang Yang, Zhoujun Huazhong University of Science and Technology School of Electrical and Electronic Engineering International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9781728196596

Microwave reflectometer is an essential diagnostic tool with high spatial and temporal resolution for the measurement of plasma density profile. In recent years, a microwave reflectometry system has been developed and optimized on the J-TEXT tokamak. It consists of three parts: Q band (33-50GHz) with extra-ordinary mode (X-mode), V band (50-75GHz) with X mode and Q band with ordinary mode (O-mode). Its measurement range covers from the edge to core of the low field side plasma. To obtain a linear frequency sweep, the dynamic calibration of the voltage control oscillator (VCO) is completed. The profile measured by the reflectometer is in good agreement with the result of the polarimetry. © 2020 IEEE.

关键词： Reflectometers

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Hydrogen embrittlement in a CoCrNi medium-entropy alloy fabricated via laser powder bed fusion: Characteristic intergranular cracking and hydrogen-enhanced twinning

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Journal of Materials Science & technology 2026年 240卷 201-213页

作者： Tingshu Chen Hang Su Motomichi Koyama Hong Luo Sui Wang Zihan Chen Anqing Fu Yanan Li Yao Zhang State Key Laboratory of Oil and Gas Equipment CNPC Tubular Goods Research Institute CNPC Tubular Goods Research Institute Xi’an 710077 China Institute for Materials Research Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980-8577 Japan Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing Beijing 100083 China

In this study, we investigated the influence of hydrogen on the intergranular cracking and micro-deformation mechanism in an equiatomic CoCrNi medium entropy alloy (MEA) fabricated via laser powder bed fusion (LPBF). The LPBF-built CoCrNi MEA was rather sensitive to hydrogen embrittlement, whose elongation deteriorated significantly when introducing hydrogen concurrently during deformation. The fracture mode also changed from ductile dimples to brittle fracture facets containing tear-ridge patterns. According to the electron backscatter diffraction (EBSD) measurements, the preferential propagation path of these brittle cracks was detected along grain boundaries, i.e., intergranular (IG) fracture. In addition to the crack path, the IG crack morphological features and local plasticity evolutions were analyzed to characterize the hydrogen-induced IG cracking in LPBF-built material. More specifically, local grain refinement within the fusion boundaries resulted in a discontinuous IG crack morphology, including frequent crack coalescence and deflection, which should be responsible for forming tear-ridge patterns on IG fracture facets. Furthermore, the subgrain boundaries also significantly affected the IG cracking since they were made of dislocations, which could enrich local hydrogen concentration and promote IG crack propagation. As for micro-deformation mechanisms, hydrogen promoted the formation of stacking faults and deformation twins by reducing stacking fault energy. With ongoing hydrogen charging, the deformation twins were triggered along different planes simultaneously at the early stage of plastic deformation instead of exhibiting a sequential procedure from forming stacking faults, primary deformation twinning to secondary deformation twinning in the uncharged specimen.

关键词： Hydrogen embrittlement CoCrNi medium entropy alloy Additive manufacturing Intergranular cracking Deformation twinning

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