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Tuning dual three-dimensional porous copper/graphite composite to achieve diversified utilization of copper current collector for lithium storage

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Rare Metals 2021年第10期40卷 2802-2809页

作者： Xia Ma Zhi-Jia Zhang Jia-Min Wang Shi-Hao Sun Shao-Fei Zhang Shen Yuan Zhi-Jun Qiao Zhen-Yang Yu Jian-Li Kang Wei-Jie Li State Key Laboratory of Separation Membrane and Membrane Processes Tianjin Municipal Key Laboratory of Advanced Fibers and Energy StorageSchool of Materials Science and EngineeringSchool of Mechanical EngineeringTiangong UniversityTianjin 300387China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China School of Materials Science and Engineering Hebei Key Laboratory of Material Near-Net Forming TechnologyHebei University of Science&TechnologyShijiazhuang 050018China Institute for Superconducting and Electronic Materials University of WollongongWollongongNSW 2522Australia

Graphite anode materials are widely used in commercial lithium-ion batteries;however, the long electron/ion transportation path restricted its high energy storage. In this experiment, we designed a copper/graphite composite with a dual three-dimensional(3 D) continuous porous structure combining used nonsolvent-induced phase separation and heat treatment, in which a large amount of graphite is embedded in the 3 D porous copper/carbon architecture. In the novel structure, not only the electron and Li^(+) transmission performances are improved, but also the space of current collector is fully utilized. Meanwhile,carbonized polyacrylonitrile network stabilizes the interface between graphite and copper matrix. The obtained copper/graphite composite anode has an initial discharge capacity of 524.6 mAh·g^(-1), a holding capacity of350 mAh·g^(-1) and excellent cycle stability(299.3 mAh·g^(-1) after 180 cycles at 0.1 C rate), exhibiting good electrochemical performance. The experimental results show that the mass loading of the copper/graphite composite electrode material is about 4.39 mg·cm^(-2). We also envisage replacing graphite with other high-capacity active materials to fill the current collector, which can provide a reference for the future development of next-generation advanced electrodes.

关键词： Graphite anode Copper current collector Dual three-dimensional porous Nonsolvent-induced phase separation Heat treatment

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Research on edge defects suppression of Mg/Al composite plate rolling: Development of embedded rolling technology

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Journal of Magnesium and Alloys 2024年

作者： Zhao, Chenchen Huang, Zhiquan Zhang, Haoran Li, Peng Wang, Tao Huang, Qingxue School of Mechatronics Engineering Harbin Institute of Technology Harbin150006 China School of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan030024 China College of Mechanical and Vehicle Engineering Taiyuan University of Technology Taiyuan030024 China National Key Laboratory of Metal Forming Technology and Heavy Equipment Xi 'an710000 China Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment Ministry of Education Taiyuan030024 China

Edge defects significantly impact the forming quality of Mg/Al composite plates during the rolling process. This study aims to develop an effective rolling technique to suppress these defects. First, an enhanced Lemaitre damage model with a generalized stress state damage prediction mechanism was used to evaluate the key mechanical factors contributing to defect formation. Based on this evaluation, an embedded composite rolling technique was proposed. Subsequently, comparative validation was conducted at 350 °C with a 50 % reduction ratio. Results showed that the plates rolled using the embedded composite rolling technique had smooth surfaces and edges, with no macroscopic cracks observed. Numerical simulation indicated that, compared to conventional processes, the proposed technique reduced the maximum edge stress triaxiality of the plates from −0.02 to −1.56, significantly enhancing the triaxial compressive stress effect at the edges, which suppressed void nucleation and growth, leading to a 96 % reduction in damage values. Mechanical property evaluations demonstrated that, compared to the conventional rolling process, the proposed technique improved edge bonding strength and tensile strength by approximately 67.7 % and 118 %, respectively. Further microstructural characterization revealed that the proposed technique, influenced by the restriction of deformation along the transverse direction (TD), weakened the plastic flow in the TD and enhanced plastic flow along the rolling direction (RD), resulting in higher grain boundary density and stronger basal texture. This, in turn, improved the toughness and transverse homogeneity of the plates. In summary, the embedded composite rolling technique provides crucial technical guidance for the preparation of Mg-based composite plates. © 2024

关键词： Grain boundaries

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Cross-coupling control of contour error for five-axis linkage machining 5

Cross-coupling control of contour error for five-axis linkag...

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2020 5th International Seminar on Computer technology, Mechanical and Electrical Engineering, ISCME 2020

作者： Peng, Baoying Hou, Mingpeng Zhang, Milan State Key Laboratory of Advanced Forming Technology and Equipment China Academy of Machinery Science and Technology Beijing China The Department of Mechanical Engineering Beijing Information Science and Technology University Beijing China

The accuracy of five-axis linkage machining is influenced by many factors, such as linear axis errors, tool rotation errors, contour trajectory changes, milling force changes, and five-axis parameters do not mismatch. To improve the machining accuracy, the kinematical model of five-axis linkage with B-C double swing head is derived on the basis of RTCP (Rotation tool center point). The following errors of five axis coupled form contour error calculation model is proposed and a cross-coupled controller is designed. Choosing the curve of impeller as an example, a simulation model of five-axis linkage machining is established. Simulation results show that the cross-coupling controller designed for can improve the machining contour accuracy of the five-axis machining effectively. © Published under licence by IOP Publishing Ltd.

关键词： Errors

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Kinetic analysis of austenite transformation for B1500HS high-strength steel during continuous heating

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International Journal of Minerals,Metallurgy and Materials 2020年第11期27卷 1508-1516页

作者： Mu-yu Li Dan Yao Liu Yang Hao-ran Wang Ying-ping Guan Key Laboratory of Advanced Forging&Stamping Technology and Science(Ministry of Education of China) Yanshan UniversityQinhuangdao 066004China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

The dilatometric curves of B1500HS high-strength steel at different heating rates were measured by a Gleeble-3800 thermal simulator and analyzed to investigate the effect of heating rate on *** show that the value of starting temperature and ending temperature of austenite transformation increase with the rise of heating rates,whereas the temperature interval of austenite formation *** kinetic equation of austenite transformation was solved using the Johnson–Mehl–Avrami model,and the related parameters of the equation were analyzed by the Kissinger *** those calculations,the activation energy of austenite transformation is 1.01×10^6 J/mol,and the values of kinetic parameters n and ln k0 are 0.63 and 103.03,*** relationship between the volume fraction of austenite and the heating time at different heating rates could be predicted using the kinetic *** predicted and experimental results were compared to verify the accuracy of the kinetic *** microstructure etched by different corrosive solutions was analyzed,and the reliability of kinetic equation was further verified from the microscopic perspective.

关键词： B1500HS high-strength steel dilatometric curve austenite transformation kinetic equation Johnson-Mehl-Avuami model

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Experimental Study on Mechanical Response of Q235 Steel Under Cyclic Stress Loading 13th

Experimental Study on Mechanical Response of Q235 Steel Unde...

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13th International Conference on the technology of Plasticity, ICTP 2021

作者： Zhang, Qingling Jin, Miao Guo, Baofeng Li, Qun School of Mechanical Engineering Yanshan University Qinhuangdao066004 China Key Laboratory of Advanced Forging & Stamping Technology and Science Ministry of Education of China Yanshan University Qinhuangdao066004 China

ISBN: (纸本)9783030753801

The cyclic softening/hardening, ratcheting effect, and Bauschinger effect usually occur in the body structure of large mechanical equipment under cyclic loading. This manuscript focuses on Q235 steel commonly used in the welded frame of large mechanical equipment. The experiments were carried out with mean stress varying from −60 to 60 MPa and stress amplitude varying from 300 to 340 MPa, respectively, and the mechanical responses were analyzed comprehensively. The experimental results show that Q235 steel exhibits cyclic softening characteristics at positive mean stress and cyclic hardening characteristics at negative mean stress. The larger the stress amplitude or the absolute value of the mean stress, the greater the absolute value of ratcheting strain. At the same stress amplitude, when the absolute value of the mean stress is equal, the Bauschinger coefficient is almost equal. Based on the experimental results, the evolution formula of ratcheting strain is established by a phenomenological method. © 2021, The Minerals, Metals & Materials Society.

关键词： Loading

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The High Magnetic-Field-Induced Thermodynamic Mechnism in the Interface between the Carbides and Martrix in Steel

SSRN

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SSRN 2024年

作者： Zheng, Yihang Hou, Tingping Cheng, Shi Yang, Yuhao Zhang, Dong Zeng, Wenfeng Xiong, Wu Wu, Kaiming The State Key Laboratory of Refractories and Metallurgy Joint International Research Laboratory of Refractories and Metallurgy Hubei Province Key Laboratory of Systems Science on Metallurgical Processing International Research Institute for Steel Technology Collaborative Center on Advanced Steels Wuhan University of Science and Technology Wuhan430081 China Wuhan Heavy Industry Casting and Forging Co. Ltd Wuhan430081 China

The physical mechanism of the magnetic field-induced phase transition for M23C6/α-Fe was investigated utilizing a combination of high-resolution transmission electron microscopy (HRTEM) with Micromagnetic theory. The HRTEM results revealed that the M23C6/α-Fe interface exhibited a specific magnetic field-induced phase transition under the action of a high-temperature magnetic field, which increased the interface thickness between the carbide and matrix. Micromagnetic modeling establishes the relationship between the boundary thickness and the external magnetic field. The magnetization curves of carbide and matrix under high magnetic field are significantly shifted toward high temperature, which contributes to the reduction of the magnetic structure difference between M23C6 and α-Fe. The application of a strong magnetic field has a notable effect on the magnetization curve, shifting it towards higher temperatures. This diminishes the discrepancy in magnetic structure between M23C6 and α-Fe, leading to a substantial reduction in magnetostatic energy while concurrently augmenting magnetic exchange energy. Consequently, this process results in an increased thickness of the boundary between M23C6 and α-Fe. Combination of experiment and theory verifies the physical mechanism of the phase transition of carbides by magnetic field to provide a new theoretical basis for the formation of carbides by magnetic field. © 2024, The Authors. All rights reserved.

关键词： Carbides

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Effect of aging treatment on Microstructure and properties of Al-Cu-Mg alloy 8

Effect of aging treatment on Microstructure and properties o...

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2022 8th International Conference on Mechanical Engineering, Materials and Automation technology, MMEAT 2022

作者： Li, Chun-Ming Lin, Zi-Yuan Zhang, Cheng-Ji Lai, Wen-Quan Hu, Ming-Wei Li, Long-Fei Zhang, Yang Zuo, Ling-Li Chen, Lin State Key Laboratory of Advanced Forming Technology and Equipment Beijing National Innovation Institute of Lightweight Ltd Beijing100083 China Zheng Xing Wheel Group Ltd Zhangzhou363000 China Hua An Zheng Xing Wheel Ltd Zhangzhou363000 China

In order to meet the demand for high strength of Al alloy in aerospace, automobile, shipbuilding and other fields, the effects of aging treatment on the microstructure and properties of Al-4.5Cu-0.8Mg alloy were systematically studied. The results show that the main strengthening phase in the microstructure of the alloy after aging was θ' And S' phase, the comprehensive mechanical properties of single-stage aging after aging at 165 °C for 12h was better. In the alloy aged at 185 °C for 12 hours, the strengthening phase was coarsen obviously, the tensile strength and yield strength was decrease greatly and showed obvious over aging characteristics. The comprehensive mechanical properties of two-stage aging at 105 °C / 12h + 165 °C / 5h was the best. The tensile strength, yield strength, elongation and hardness are 543 MPa and 374 MPa, 17.5% and 170.6 HV respectively. © Published under licence by IOP Publishing Ltd.

关键词： Magnesium alloys

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Melting behavior of VNbMoTa particle and its influence on microstructure and mechanical properties of laser additively manufactured nickel matrix composites

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Journal of Materials Research and technology 2025年 36卷 8698-8710页

作者： Shang Sui Jiawei Qi Dong Ma Chunjie Xu Can Guo Xiangquan Wu Zhongming Zhang School of Materials Science and Engineering Xi'an University of Technology Xi'an Shaanxi 710048 China Xi'an Shechtman Nobel Prize New Materials Institute Xi'an Shaanxi 710048 China Xi'an Key Laboratory of Advanced Magnesium Alloy Additive Manufacturing and Precision Forming Xi'an Shaanxi 710048 China

The currently used reinforcing particles in the additively manufactured nickel matrix composites (NMCs) are limited to non-deformable particles, largely restricting the advancement of novel composite materials. High entropy alloy is a kind of reinforcing particles possessing tremendous potential, however, its application in NMCs has not been realized hitherto. In this work, the ductile VNbMoTa is chosen as the reinforcing particle, and the feasibilities of its employment in two printing processes (laser directed energy deposition, LDED and laser powder bed fusion, LPBF) of Inconel 625 are investigated in detail. The numerical simulation is used to compute the melt pool morphology and the melting time of the VNbMoTa particle. The results demonstrate that the VNbMoTa particles are completely melted in the LDED process, while preserved in the LPBF process, which is ascribed to the longer time for melting offered in the former melt pool. Additionally, the unmelted VNbMoTa particles are conducive to refining grains and inducing equiaxed grain formation, while the fully melted VNbMoTa particles have little effect on grain structure. The main reason lies in the fact that the unmelted VNbMoTa particles can enhance the heterogenous nucleation to induce more new grains formation and hinder the movement of the grain boundary to suppress the grain coarsening. The LPBF-processed NMCs demonstrate excellent strength-ductility synergy with the yield strength of 1083.7 ± 19.3 MPa and the elongation of 12.1 ± 2.2 %. The hetero-deformation induced strengthening effect caused by the ductile VNbMoTa particles attributes to the outstanding yield strength of the LPBF-processed NMCs.

关键词： Laser directed energy deposition Laser powder bed fusion Nickel matrix composites High entropy alloy Microstructure Mechanical properties

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Bauschinger effect in nano-grinding of 3C-SiC: A molecular dynamics study

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Wear 2025年 571卷

作者： Zhao, Xiangyang Tang, Yunqing Chen, keyang Cai, Yukui Liang, Xiaoliang Liu, Zhanqiang Li, Dongyang School of Mechanical Engineering Shandong University Jinan250061 China State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Jinan250061 China Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education Jinan250061 China Key National Demonstration Center for Experimental Mechanical Engineering Education Jinan250061 China Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology Guilin University of Electronic Technology Guilin541004 China Department of Chemical and Materials Engineering University of Alberta EdmontonABT6G 2H5 Canada

The Bauschinger effect typically occurs in ductile materials and influences their tribological behaviors. However, this phenomenon is rarely reported in brittle materials. The nano-scale plastic deformation observed in brittle materials implies that the Bauschinger effect may also occur during their nano-tribological processes. In this study, molecular dynamics simulations were employed to evaluate the Bauschinger effect in cubic silicon carbide (3C-SiC) and its effect on nano-grinding of 3C-SiC. The results show that defects generated in 3C-SiC during shear deformation recover upon reversal of the shear direction, and defects near the surface of 3C-SiC workpiece generated during nano-grinding also recover upon reversal of the grinding direction, which validates the hypothesis that the Bauschinger effect may occur in 3C-SiC and could benefit its machinability. The Bauschinger effect during bi-directional grinding could help significantly reduce the damage and roughness to the surface of 3C-SiC and also help lower the machining resistance. Such benefits from the Bauschinger effect are found to be more pronounced at relatively lower temperatures, which makes the machinability of 3C-SiC during the bi-directional grinding at relatively lower temperatures comparable to that during the unidirectional grinding at higher temperatures. Therefore, taking advantage of the Bauschinger effect could help lower the operation temperature for high-quality and high-efficiency grinding of 3C-SiC with reduced defects, roughness, and resistance. This study provides an insight into the nano-tribological behaviors of brittle materials and demonstrates an effective approach for their ultra-precision machining. © 2025 Elsevier B.V.

关键词： Machinability

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Progress in ceramic materials and structure design toward advanced thermal barrier coatings

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Journal of advanced Ceramics 2022年第7期11卷 985-1068页

作者： Zhi-Yuan WEI Guo-Hui MENG Lin CHEN Guang-Rong LI Mei-Jun LIU Wei-Xu ZHANG Li-Na ZHAO Qiang ZHANG Xiao-Dong ZHANG Chun-Lei WAN Zhi-Xue QU Lin CHEN Jing FENG Ling LIU Hui DONG Ze-Bin BAO Xiao-Feng ZHAO Xiao-Feng ZHANG Lei GUO Liang WANG Bo CHENG Wei-Wei ZHANG Peng-Yun XU Guan-Jun YANG Hong-Neng CAI Hong CUI You WANG Fu-Xing YE Zhuang MA Wei PAN Min LIU Ke-Song ZHOU Chang-Jiu LI State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory for Strength and Vibration of Mechanical Structures Department of Engineering MechanicsSchool of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049China Xi’an Aerospace Composite Research Institute Xi’an 710025China AECC Beijing Institute of Aeronautical Materials Beijing 100095China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of New Ceramics&Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Faculty of Materials and Manufacturing Key Laboratory of Advanced Functional MaterialsEducation Ministry of ChinaFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Xi’an Key Laboratory of High Performance Oil and Gas Field Materials School of Materials Science and EngineeringXi’an Shiyou UniversityXi’an 710065China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming Shanghai Jiao Tong UniversityShanghai 200240China National Engineering Laboratory for Modern Materials Surface Engineering Technology the Key Lab of Guangdong for Modern Surface Engineering TechnologyInstitute of New MaterialsGuangdong Academy of SciencesGuangzhou 510650China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Integrated Computational Materials Research Centre Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China State Key Laboratory of Advanced Processing and Recycling of

Thermal barrier coatings(TBCs)can effectively protect the alloy substrate of hot components in aeroengines or land-based gas turbines by the thermal insulation and corrosion/erosion resistance of the ceramic top ***,the continuous pursuit of a higher operating temperature leads to degradation,delamination,and premature failure of the top *** new ceramic materials and new coating structures must be developed to meet the demand for future advanced TBC *** this paper,the latest progress of some new ceramic materials is first ***,a comprehensive spalling mechanism of the ceramic top coat is summarized to understand the dependence of lifetime on various factors such as oxidation scale growth,ceramic sintering,erosion,and calcium–magnesium–aluminium–silicate(CMAS)molten salt ***,new structural design methods for high-performance TBCs are discussed from the perspectives of lamellar,columnar,and nanostructure *** latest developments of ceramic top coat will be presented in terms of material selection,structural design,and failure mechanism,and the comprehensive guidance will be provided for the development of next-generation advanced TBCs with higher temperature resistance,better thermal insulation,and longer lifetime.

关键词： thermal barrier coatings(TBCs) ceramic material degradation and failure structure design long lifetime

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