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SSRN 2023年

作者： Wu, Liwei Zhang, Jian Zhao, Feng Zhou, Kanghui Lu, Zhenqian Liu, Shengkai Jiang, Qian Tianjin and Ministry of Education Key Laboratory for Advanced Textile Composite Materials Tiangong University Tianjin300387 China Innovation Platform of Intelligent and Energy-Saving Textiles School of Textile Science and Engineering Tiangong University Tianjin300387 China State Key Laboratory for Precision and Non-Traditional Machining Technology Dalian University of Technology Dalian116024 China College of Textiles and Clothing Yancheng Institute of Technology Jiangsu224051 China

Owing to their shear stiffening and cold-flow properties, shear stiffening gels (SSG) have attracted considerable attention for cushioning applications. This paper presents the design of negative Poisson's ratio flexible cushioning composites featuring a double-arrow structure (DAS). The structure is optimized using a modified genetic algorithm, and the cohesive property is leveraged to reinforce the shear stiffening effect of SSG, thereby improving the material's protective cushioning efficiency. We revealed the synergistic effect of the DAS and SSG and the law of SSG arrangement on the energy absorption efficiency of cushioning using the finite element method (FEM). The results indicate that the cohesive effect of the DAS unit optimized by the modified genetic algorithm reaches the maximum, corresponding to the Poisson’s ratio value V=-1.3 when α1=0.05 (ratio of cell wall thickness to long cell wall length) and β=0.4 (ratio of horizontal cell wall to long diagonal wall length). The same proportional size (α1=0.05, β=0.4) S3-DAS has a better cohesive effect, and its Poisson’s ratio is decreased from -0.25 to -0.56 compared with the same proportional size S1-DAS. The S3 double-arrow structure composite (S3-DASC) exhibited a smaller peak load. The peak load of S3-DASC was 2.87% lower than that of S1-DASC at an impact height of 250 mm. When the impact height increased to 450 mm, the peak load ratio increased to 5.56%. Forward placement method S3 (S3-FP) arranges more reversed triangles with higher deformations, inducing more shear stiffening of the SSG, which enhances impact load dissipation capability of the SSG, thus having lower peak loads. The peak load of S3-FP was reduced by 3.4% compared with that of S3-RP at an impact height of 250 mm. When the impact height increased to 450 mm, the peak load ratio improved to 8.56%. The cohesive effect of the interspaced longitudinal filling arrangement (L) was superior to that of the transverse (T) and full filling arrangeme

关键词： Gels

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Dislocation-mediated migration of interphase boundaries

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Journal of materials Science & technology 2019年第11期35卷 2714-2726页

作者： Zhipeng Sun Fuzhi Dai Ben Xu Wenzheng Zhang School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Science and Technology of Advanced Functional Composite Laboratory Aerospace Research Institute of Materials and Processing TechnologyBeijing 100076China Key Laboratory of Advanced Materials(MOE) State Key Laboratory of New Ceramics and Fine ProcessingChina

Faceted interphase boundaries(IPBs)are commonly observed in lath-shaped precipitates in alloys consisting of simple face-centred cubic(fcc),body centred-cubic(bcc)or hexagonal closed packed(hcp)phases,which normally contain one or two sets of parallel *** influence of these dislocations on interface migration and possible accompanying long-range strain field remain *** elucidate this,we carried out atomistic simulations to investigate the dislocation-mediated migration processes of IPBs in a pure-iron *** results show that the migration of these IPBs is accompanied with the slip of interfacial dislocations,even in high-index slip planes,with two migration modes were observed:the first mode is the uniform migration mode that occurs only when all of the dislocations slip in a common slip plane.A shear-coupled interface migration was observed for this *** other interfaces propagate in the stick-slip migration mode that occurs when the dislocations glide on different slip planes,involving dislocation reaction or tangling.A quantitative relationship was established to link the atomic displacements with the dislocation structure,slip plane,and interface *** macroscopic shear deformation due to the effect of overall atomic displacement shows a good agreement with the results obtained based on the phenomenological theory of martensite *** findings have general implications for the understanding of phase transformations and the surface relief effect at the atomic scale.

关键词： Interphase boundary migration O-line interface Shear-coupled interface migration Dislocation gliding Atomic displacement

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A Multiscale Study on the Microstructure and Hardening Models of the Irradiation Defects on Reactor Pressure Vessel Steels: Modelling and Experiment

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SSRN 2023年

作者： Lin, Pan-Dong Nie, Jun-Feng Cui, Wen-Dong He, Lei Lu, Yu-Peng Cui, Shu-Gang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan250061 China School of Materials Science and Engineering Shandong University Jinan250061 China Institute of Nuclear and New Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety Ministry of Education Tsinghua University Beijing100084 China

Irradiation defects are known to impede the dislocation motion in irradiated reactor pressure vessel (RPV) steels. However, consistent experimental studies of the respective irradiation defects and relevant theoretical studies of the interaction mechanism and hardening model are still lacking. In this study, the microstructure and irradiation-induced hardening of RPV steels are investigated using transmission electron microscopy (TEM)/energy-dispersive X-ray spectrometry (EDS) and molecular dynamics (MD) simulations. In A508-Ⅲ steel, the microstructures irradiated with 3.5-MeV Fe ions include a Cu cluster, void, and dislocation loop. After the irradiation experiment, 9R, twinned fcc, and other typical Cu cluster structures are observed using TEM. Based on the experimental results, MD simulations are performed to study the interactions between the dislocations and Cu clusters or voids. A phase diagram of the interaction mechanism coupling the effects of temperature and defect size is shown for both the Cu clusters and voids. A relevant hardening model is proposed based on the MD data, which is further discussed in relation to the macroscopic mechanical properties. Furthermore, the irradiation-induced hardening of the RPV steel is successfully predicted, which further demonstrates the reliability of the proposed unified hardening model. © 2023, The Authors. All rights reserved.

关键词： Molecular dynamics

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MoC nanoclusters anchored Ni@N‐doped carbon nanotubes coated on carbon fiber as three‐dimensional and multifunctional electrodes for flexible supercapacitor and self‐heating device

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Carbon Energy 2021年第1期3卷 129-141页

作者： Fan Liu Jietong He Xiaoyu Liu Yuke Chen Zhen Liu Duo Chen Hong Liu Weijia Zhou Institute for Advanced Interdisciplinary Research(iAIR) Shandong Collaborative Innovation Center of Technology and Equipements for Biological Diagnosis and TherapyUniversity of JinanJinanChina State Key Laboratory of Crystal Materials Shandong UniversityJinanShandongChina Guangzhou Key Laboratory for Surface Chemistry of Energy Materials School of Environment and EnergyNew Energy Research InstituteGuangzhou Higher Education Mega CenterSouth China University of TechnologyGuangzhouGuangdongChina

With the rapid development of different kinds of wearable electronic devices,flexible and high‐capacity power sources have attracted increasing *** this study,a facile strategy to fabricate Ni nanoparticles embedded in N‐doped carbon nanotubes(CNTs)(Ni@NCNTs)homogeneously coated on the surface of carbon fiber with a multistructural component of molybdenum carbide(MoC/Ni@NCNTs/CC)was *** are two forms of MoC in MoC/Ni@NCNTs/CC,including the MoC nanoclusters in a size of 2 to 4 nm anchored on Ni@N‐doped CNTs and the MoC nanoparticles as an interface between MoC/Ni@NCNTs and carbon cloth(CC).Multifunctional MoC/Ni@NCNTs/CC served as both positive and negative electrode and a heater in flexible supercapacitors and in wearable devices,which exhibited excellent electrochemical and heating ***,an all‐solid‐state supercapacitor consists of two pieces of MoC/Ni@NCNTs/CC that exhibited extraordinary energy storage performance with high‐energy density(78.7μWh/cm2 at the power density of 2.4 mW/cm2)and excellent cycling stability(≈91%capacity retention after 8000 cycles).Furthermore,all‐solid‐state flexible supercapacitors were incorporated with an MoC/Ni@NCNTs/CC electrode into self‐heating flexible devices for keeping the human body ***,MoC/Ni@NCNTs/CC is a promising electrode material for flexible and wearable storage systems and heating electronic application.

关键词： carbon nanotube molybdenum carbide nanoclusters self‐heating supercapacitor

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Multiscale Study on Irradiation Effect of A508- III Steel by Experimental Observation and Crystal Plasticity Finite Element Model

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SSRN 2023年

作者： Lin, Pan-Dong Nie, Jun-Feng Cui, Wen-Dong He, Lei Lu, Yu-Peng Cui, Shu-Gang Xiang, Li-Xin Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan250061 China School of Materials Science and Engineering Shandong University Jinan250061 China Institute of Nuclear and New Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University Beijing100084 China

Irradiation can induce microscopic defects in reactor pressure vessel (RPV) steel, resulting in macroscopic hardening and embrittlement. In this study, Fe-ion irradiation, electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), nano-indentation testing, and a crystal plasticity finite element model (CPFEM) are utilized to explore the relationship between microscopic irradiation defects and macroscopic mechanical properties of A508-Ⅲ steel. The effect of irradiation is introduced in an Fe-ion irradiation experiment. The mean size and number density of the irradiation-induced dislocation loops are measured using TEM, which is described in a power function relationship with the irradiation dose at various temperatures. The irradiation defect data obtained from the experiment are used as input parameters for the CPFEM, and nano-indentation tests of A508-Ⅲ steel under different conditions are successfully simulated. Furthermore, irradiation-induced increases in the yield stress and brittle-ductile transition temperature (BDTT) at various temperatures are investigated. The results show that the yield stress, BDTT, and degree of irradiation hardening and embrittlement increase with an increase in the irradiation dose. However, the yield stress and BDTT decrease with an increase in irradiation temperature. In addition, the size and number of irradiation defects increase with an increasing irradiation dose, and the number of dislocation loops clearly decrease with an increase in irradiation temperature. However, the size of the dislocation loops increases continuously. This work is significant for the study of the irradiation effect of RPV steel during actual operation. © 2023, The Authors. All rights reserved.

关键词： Ion bombardment

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Study of Multi-Frequency Electromagnetic Responses on Microstructural Components of Steels and Characterization Analysis

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SSRN 2024年

作者： Zhao, Jianing Shen, Jialong Xiao, Shuaishuai Liu, Xi Chen, Yufeng Meng, Zhengbing Zhou, Lei Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Ministry of Education Guilin University of Technology Guangxi Guilin541004 China Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources Guilin University of Technology Guilin541004 China Advanced Manufacturing and Materials Centre WMG University of Warwick CoventryCV4 7AL United Kingdom College of Materials Science and Engineering

Microstructures dominate mechanical properties of steel materials. Monitoring and controlling microstructure variations are important for high-quality steel productions. In this study, the multi-frequency electromagnetic technology is used to effectively characterize changes of steel microstructures. Steel samples with individual micro- components are obtained using different heat treatments and are measured using a self-designed multi-frequency electromagnetic system. Micro- and Macro- FE models are developed to discuss electromagnetic responses on steel microstructures with different phases, grain size and grain boundaries. The relative permeability of different steel microstructures are calculated and discussed. Results show that the low frequency inductance will increase with the increase of ferrite grain size and ferrite fraction. The relative permeability of single ferrite grain boundary is determined to be 165 and the orientation of grain boundary can influence the relative permeability of steel microstructures. © 2024, The Authors. All rights reserved.

关键词： Ferrite

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Efficient Electrochemical Synthesis of Cu 3 Si/Si Hybrids Asnegative Electrode Material for Lithium-Ion Battery

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SSRN 2024年

作者： Jiang, Siwei Cheng, Jiaxu Nayaka, G.P. Dong, Peng Zhang, Yingjie Zhou, Zhongren Xing, Yubo Zhang, Xiaolei Du, Ning Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming650093 China National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan Province Kunming University of Science and Technology Kunming650093 China Physical & Materials Chemistry Division CSIR-National Chemical Laboratory Pune India Carbon ONE New Energy Group Co. Ltd. State Key Lab of Silicon Materials Zhejiang University Hangzhou310027 China

Nanoscaling and alloying techniques for silicon-based materials are widely recognized as vital technological approaches to effectively address the challenges associated with volume expansion and poor conductivity in silicon anodes. Developing short process, cost-effective preparation methods and shape controllable silicon-based materials is expected to improve their cyclability. Herein, benefiting from the high electrical conductivity of metallic copper and its stable alloy phase with silicon, the present study introduced a simple synthetic process by incorporating nanoscale Cu2O into a SiO2 dioxide matrix under a combination of hydrothermal reaction with Cu(NO3)2 as the copper source and further sintering treatment. Under the conditions of a Cu:Si molar ratio to 3:8 under 850°C by 2.6 V of constant electrolsyis for 3 h, straight silicon nanowires with a cross-sectional distribution were obtained. The Cu3Si alloy particles were enriched around silicon nanowires. The electrochemical lithium storage performance of the Cu3Si/Si nanowires was tested, yielding an initial specific capacity of 2530.7 mAh/g and an initial coulombic efficiency of 88.94%. After 100 charge-discharge cycles, the discharge specific capacity reached 1675.4 mAh/g, with a capacity retention rate of 66.20%. The unique Cu3Si/Si architecture provides an ideal model that can be used to design Si-based composite anode for advanced LIBs. © 2024, The Authors. All rights reserved.

关键词： Anodes

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Arc Erosion Resistance of Al2o3-Cu/35mo Composites Reinforced by Trace Graphene Oxide

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SSRN 2024年

作者： Li, Lihua Zhang, Jiacan Zhou, Meng Tian, Baohong Zhang, Yi Jing, Ke Li, Xu Sun, Yonghui Volinsky, Alex A. Guo, Huiwen School of Materials Science and Engineering Henan University of Science and Technology Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metals New Materials and Advanced Processing Technology Luoyang471023 China Henan Province Key Laboratory of Nonferrous Materials Science and Processing Technology Luoyang471023 China Center for Advanced Measurement Science National Institute of Metrology Beijing100029 China Chinalco Luoyang Copper Processing Co. Ltd. Luoyang471000 China Department of Mechanical Engineering University of South Florida 4202 E. Fowler Ave. ENG 030 Tampa33620 United States

In this study, Al2O3-Cu/35Mo composites were prepared by rapid hot-press sintering-internal oxidation method, and the materials were modified by adding trace amounts of graphene oxide (GO). The results show that the relative densities of the composites are above 99%, the γ-Al2O3 generated by internal oxidation is diffusely distributed on the copper matrix. The addition of GO produced a small amount of hard MoC particles at the interface, which effectively enhance the interfacial bonding force of the composites. In the 30V DC, 10-30A electrical contact test, the anode mass of the composites increases, while the cathode mass decreases. And GO reduces the total mass loss of the electric contact by 63.6%, 38.9%, 51.3% and 20.9%, respectively. A comparison of the electrical contact properties of the two materials showed that the addition of GO dispersed the concentrated erosion of the arc. At 10A and 30A, the arc energy is reduced by 75.5% and 12.5%, respectively. With the gradual increase in electric current, GO makes the Al2O3-Cu/35Mo composites more stable during the electric contact process, improves the anti-welding ability of the contact and reduces contact resistance. © 2024, The Authors. All rights reserved.

关键词： Graphene

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An Experimental and Numerical Study on the Evolution of Pores and its Effect on the Tensile Properties of LPBF Invar36 with Different Energy Density

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SSRN 2024年

作者： Yang, Zheyu Chen, Yue Wang, Shubang Bian, Gongbo Lan, Liwei Wang, Wenxian Zhao, Zhenan Zhang, Hongwei Li, Changchun Wang, Xiangbing College of Materials Science and Engineering Taiyuan University of Technology Taiyuan030024 China Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Ministry of Education Taiyuan030024 China Shanxi-Zhejiang University New Materials and Chemical Research Institute Taiyuan030032 China State Key Laboratory of Fluid Power and Mechatronic Systems Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Department of Engineering Mechanics Zhejiang University Hangzhou310027 China Key Laboratory of Superlight Material and Surface Technology Ministy of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin150001 China

Laser powder bed fusion (LPBF) Invar 36 alloy has attracted plenty of attention in cryogenic components or precision instruments due to its low coefficient of thermal expansion in a wide range of temperature. However, the LPBF Invar 36 has a significant anisotropic mechanical property due to the unique columnar grain morphology and pore feature. In this study, the influence of scanning speed on the anisotropic tensile properties were investigated. In this respect, tensile tests of specimens parallel and perpendicular to the building direction with a scanning speed from 200 to 1400 mm/s of LPBF Invar 36 alloy were conducted, and the microstructural influential factors on the anisotropic tensile properties were analyzed. Results show that as the volumetric energy density (VED) increases, the inhomogeneity of grain morphology decreases, while the pore feature changes from the lack-of-fusion (LOF) pore perpendicular to the building direction to the bubble-shaped spherical pore, which is resulted from the collapse of the locking holes. In this case, the grain orientation and size, as well as the dislocation density in the vicinity of pores are influenced by the pore morphology due to different thermal history. On the whole, the increased level of anisotropy in pores are the main reason of the increased level of anisotropy in tensile properties. © 2024, The Authors. All rights reserved.

关键词： Anisotropy

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Melamine-assisted pyrolytic synthesis of bifunctional cobalt-based core–shell electrocatalysts for rechargeable zinc–air batteries

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Journal of Energy Chemistry 2021年第2期30卷 364-371,I0013页

作者： Jiqing Jiao Yuan Pan Bin Wang Wenjuan Yang Shoujie Liu Chao Zhang Institute for New Energy Materials and Low Carbon Technologies School of Material Science and EngineeringTianjin University of TechnologyTianjin 300384China College of Materials Science and Engineering Qingdao UniversityQingdao 26607JShandongChina State Key Laboratory of Heavy Oil Processing China University of Petroleum(East China)Qingdao 266580ShandongChina Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060GuangdongChina College of Chemistry and Materials Science Anhui Normal UniversityWuhu 241000AnhuiChina

Designing a highly active-and stable non-noble metal bifunctional oxygen catalyst for rechargeable Znair battery remains a great challenge. Herein, we develop a facile and melamine-assisted-pyrolysis(MAP)strategy for the synthesis of core–shell Co-based electrocatalysts@N-doped carbon nanotubes(Co@CNTs)derived from metal–organic frameworks. The Co@CNTs exhibited excellent bifunctional electrocatalytic performance for both oxygen evolution and reduction. DFT calculations demonstrated that the Gibbs free energy of the rate-determining step was small enough to improve ORR activities. As a result, a Zn-air battery assembled with Co@CNTs proves a lager power density, low voltage gap between charge–discharge and excellent stability. Thus, this work offers a facile strategy to realize the synthesis of non-noble metal electrocatalyst for Zn-air battery materials with high electrochemical performance.

关键词： Oxygen evolution reaction Oxygen reduction reaction Controllable synthesis Co@Carbon nanotubes Zn-air battery

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