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Chevrel phase: A review of its crystal structure and electrochemical properties

Progress in Natural science:materials International 2023年第1期33卷 8-15页

作者： Meng Liu Guocheng Lv Tianming Liu Hao Liu Lingchang Kong Lintao Tian Wenxiu Rao Yuxin Li Libing Liao Juchen Guo Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences(Beijing) School of Science China University of Geosciences Materials Science and Engineering Program University of California-Riverside Department of Chemical and Environmental Engineering University of California – Riverside

Chevrel phase compounds have attracted increasing attention as electrochemical energy storage materials and electro-catalysts. Benefiting from their unique crystal structure, Chevrel phase compounds can not only function as the host structures for reversible intercalation of a broad range of cations, but also exhibit high catalytic activity in electrochemical reduction reactions. Here we provide an overview of recent progress in the development of Chevrel phase materials including new understanding of structural features, synthetic methods, and electrochemical properties. A brief conclusion and perspectives on the future development of Chevrel phase materials are also provided.

关键词： Chevrel phase Electrochemical properties Energy storage Electro-catalysis

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Determination of multiaxial stress rupture criteria for creeping materials:A critical analysis of different approaches

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Journal of materials science & Technology 2023年第6期137卷 14-25页

作者： Kun Zhang Jian-Ping Tan Wei Sun Kamran Nikbin Shan-Tung Tu Key Laboratory of Pressure Systems and Safety(Ministry of Education) School of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai200237China Department of Mechanical Materials and Manufacturing EngineeringUniversity of NottinghamNottinghamNG72RDUK Department of Mechanical Engineering Imperial College LondonLondonSW72AZUK

materials in engineering applications are rarely *** reality,failures under multiaxial loading has been widely observed in engineering *** life prediction of a component under multiaxial stresses has long been a challenging issue,particularly for high temperature *** distinguish the mode of failure ranging from a maximum principal stress intergranular damage to von Mises effective stress rupture mode a multiaxial stress rupture criterion(MSRC)was originally proposed by Sdobyrev and then Hayhurst and Leckie(SHL MSRC).A multiaxial-factor,α,was developed as a result which was intended to be a material constant and differentiates the bias of the MSRC between maxi-mum principal stress and effective *** success of the SHL MSRC relies on accurately calibrating the value ofαto quantify the multiaxial response of the material/geometry *** find a more suitable approach for determining MSRC,the applicability of different methods are *** that the resulting analysis of the various approaches can be affected by the creep failure mechanism,princi-ples in the determination of MSRC with and without using continuum damage mechanics approaches are *** viability of uniaxial material parameters in correlating withαthrough the analysis of available data in literature is also *** is found that the increase of the uniaxial creep dam-age tolerance parameterλis accompanied bythe decreaseof theα-value,whichimplies thatthe creep ductility plays an important role in affecting the multiaxial rupture behavior of materials.

关键词： Multiaxial stress rupture criterion Creep failure mechanism Uniaxial parameter Creep damage tolerance parameter Continuum damage mechanics

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Characteristics of surface and subsurface of formed thread parts by axial-infeed thread rolling process

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Chinese Journal of Aeronautics 2023年第3期36卷 471-481页

作者： Shuowen ZHANG Dawei ZHANG Shengdun ZHAO Fei JIANG Myoung-Gyu LEE Xi’an Key Laboratory of Intelligent Equipment and Control School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China Department of Materials Science and Engineering Seoul National University08826 SeoulRepublic of Korea

The thread rolling process has been widely applied to manufacture high-performance thread *** this process,the evolutions of surface and subsurface are frequently introduced,which affect the working performance of manufactured *** this study,an axial-infeed thread rolling process(ATRP)is employed,and the macro-meso surface characteristics under different lubrications and operating conditions are ***,the distributions of microstructure and hardness on the subsurface of formed tooth are analyzed in detail,along with the study of stress state and yield strength *** is found that the MoS_(2)grease is more effective in reducing the surface roughness and defects than the lubrication oil and water-base graphite during the ATRP *** rolling speed improves the quality of surface morphology and can reduce the surface *** the subsurface of bottom and flank,intensive shear stress occurs in a narrow region,resulting in the elongation and refinement of the grains and increasing the low angle grain boundary *** on the grain size and plastic strain,the yield strength is *** maximum yield strength and hardness on the bottom of formed tooth are improved by 41.2% and 39.4%,respectively.

关键词： ATRP Lubrication Surface characteristics Microstructure distribution Hardness improvement Grain size

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Insights into flexural and impact properties of polymer based materials printed through fused filament fabrication: Progress in the last decade

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International Journal of Lightweight materials and Manufacture 2024年第6期7卷 925-957页

作者： Khan, Wajid Ali Hassan, Malik Ahmed, Iftikhar Xiao, Maohua Faraz, Muhammad Iftikhar Li, Kan Khan, Imran Muhammad, Riaz Wu, Hongyan Hussain, G. Department of Mechanical Engineering School of Engineering Bahrain Polytechnic 33349 Bahrain School of Engineering University of Guelph Thornbrough Building GuelphONN1G 2W1 Canada Mechanical Engineering Department College of Engineering. Nanjing Agriculture University Nanjing210031 China Department of Mechanical Engineering College of Engineering King Faisal University Al Asha 31982 Saudi Arabia Nanjing Chenguang Group Co.Ltd China University of Engineering and Technology Peshawar Pakistan Mechanical Engineering Department College of Engineering University of Bahrain Isa Town 32038 Bahrain School of Chemistry and Materials Science Nanjing University of Information Science and Technology Nanjing China

The Fused Filament Fabrication is an economic 3D printing process to produce lightweight polymers-based structures. Therefore, it is drawing a consistently increasing interest from industry and researchers. Flexural and impact properties are two of the critical performance measures for gauging the integrity of the printed structures. Since 2014, numerous studies have been carried out on this topic, however, their holistic overview with a focus on the flexural and impact properties has been barely presented in the literature. The current article reviews the relationship between the process parameters, both operating and geometrical, and these properties in detail. The cause-effect relationship is thoroughly examined considering material effect. This allows the identification of the complex interactive effects and conducive ranges of the important parameters to effectively control the process for achieving the desired mechanical properties. The review establishes that the crystallinity of post-printed polymers is a crucial factor in controlling the mechanical properties, and filled polymers generally offer better properties than unfilled ones if the right filler given the desired properties is chosen. Topology optimization, recyclability of polymers through FFF, and retention of polymer properties after printing are also discussed as innovative trends. Finally, limitations and research gaps are identified, and the latest ideas are proposed as a way forward for further development of the FFF technology. © 2024 The Authors

关键词： Elastomers

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Combined Experimental and Computational Insight into the Role of Substrate in the Synthesis of Two-Dimensional WSe2

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ACS Applied materials and Interfaces 2024年第5期16卷 6644-6652页

作者： Momeni, Kasra Sakib, Nuruzzaman Figueroa, Daniel E. Cintron Paul, Shiddartha Chen, Cindy Y. Lin, Yu-Chuan Robinson, Joshua A. Department of Mechanical Engineering The University of Alabama TuscaloosaAL35487 United States Department of Chemistry The Pennsylvania State University University ParkPA16802 United States Department of Materials Science and Engineering The Pennsylvania State University University ParkPA16802 United States Department of Mechanical Engineering The University of Illinois at Urbana−Champaign UrbanaIL61801 United States Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsin-Chu30010 Taiwan

Synthesis of large-area transition-metal dichalcogenides (TMDs) with controlled orientation is a significant challenge to their industrial applications. Substrate plays a vital role in determining the final quality of monolayer materials grown via the chemical vapor deposition process by controlling their orientation, crystal structure, and grain boundary. This study determined the binding energy and equilibrium distance for tungsten diselenide (WSe2) monolayers on crystalline and amorphous silicon dioxide and aluminum dioxide substrates. Differently oriented WSe2 monolayers are considered to investigate the role of the substrate in the orientation, binding strength, and equilibrium distance. This study can pave the way to synthesizing high-quality two-dimensional (2D) materials for electronic and chemical applications. © 2024 American Chemical Society

关键词： Selenium compounds

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Local-distortion-informed exceptional multicomponent transition-metal carbides uncovered by machine learning

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npj Computational materials 2024年第1期10卷 1576-1585页

作者： Jun Zhang Liu He Yaoxu Xiong Shasha Huang Biao Xu Shihua Ma Xuepeng Xiang Haijun Fu Jijung Kai Zhenggang Wu Shijun Zhao Department of Mechanical Engineering City University of Hong KongHong KongChina College of Materials Science and Engineering Hunan UniversityChangshaHunan410082China Hong Kong Institute for Advanced Study City University of Hong KongHong KongChina

Developing high-performance multicomponent ceramics,which are promising in solving challenges posed by emerging technologies,shows grand difficulties because of the immense compositional space and complex local *** this work,an accurate machine learning(ML)model built upon an ab initio database is developed to predict the mechanical properties and structural distortions of multicomponent transition metal carbides(MTMCs).

关键词： carbides distortion multicomponent

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Unlocking Novel Functionality:Pseudocapacitive Sensing in MXene-Based Flexible Supercapacitors

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Nano-Micro Letters 2025年第4期17卷 212-229页

作者： Eunji Kim Seongbeen Kim Hyeong Min Jin Gyungtae Kim Hwi-Heon Ha Yunhui Choi Kyoungha Min Su-Ho Cho Hee Han Chi Won Ahn Jaewoo Roh Il-Kwon Oh Jinwoo Lee Yonghee Lee Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-RoYuseong-GuDaejeon 34141Republic of Korea National Nano Fab Center(NNFC) 291 Daehak-RoYuseong-GuDaejeon 34141Republic of Korea Department of Organic Materials Engineering Chungnam National University99 Daehak-RoYuseong-GuDaejeon 34134Republic of Korea Department of Materials Science and Engineering Chungnam National University99 Daehak-RoYuseong-GuDaejeon 34134Republic of Korea Department of Nano&Advanced Materials Science and Engineering Kyungpook National University2559Gyeongsang-DaeroSangju-SiGyeongsangbuk-Do 37224Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-RoYuseong-GuDaejeon 34141Republic of Korea

Extensively explored for their distinctive pseudocapacitance characteristics,MXenes,a distinguished group of 2D materials,have led to remarkable achievements,particularly in the realm of energy storage *** work presents an innovative Pseudocapacitive *** key lies in switching the energy storage kinetics from pseudocapacitor to electrical double layer capacitor by employing the change of local pH(-log[H^(+)])in MXene-based flexible supercapacitors during *** sensing is observed in acidic electrolyte but absent in neutral *** shearing during bending causes liquid-crystalline MXene sheets to increase in their degree of anisotropic *** blocking of H+mobility due to the higher diffusion barrier,local pH *** electrochemical energy storage kinetics transits from Faradaic chemical protonation(intercalation)to non-Faradaic physical *** utilize the phenomenon of capacitance change due to shifting energy storage kinetics for strain sensing *** developed highly sensitive Pseudocapacitive Sensors feature a remarkable gauge factor(GF)of approximately 1200,far surpassing conventional strain sensors(GF:~1 for dielectric-cap sensor).The introduction of the Pseudocapacitive Sensor represents a paradigm shift,expanding the application of pseudocapacitance from being solely confined to energy devices to the realm of multifunctional *** technological leap enriches our understanding of the pseudocapacitance mechanism of MXenes,and will drive innovation in cutting-edge technology areas,including advanced robotics,implantable biomedical devices,and health monitoring systems.

关键词： MXenes Supercapacitors Pseudocapacitive sensing Local pH Operando measurements

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Accurate prediction of oxygen vacancy concentration with disordered A-site cations in high-entropy perovskite oxides

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npj Computational materials 2023年第1期9卷 2053-2065页

作者： Jiyun Park Boyuan Xu Jie Pan Dawei Zhang Stephan Lany Xingbo Liu Jian Luo Yue Qi School of Engineering Brown UniversityProvidenceRI 02912USA Department of Physics Brown UniversityProvidenceRI 02912USA Department of Chemical Engineering and Materials Science Michigan State UniversityEast LansingMI 48824USA Program of Materials Science and Engineering University of California San DiegoLa JollaCA 92093USA Materials Science Center National Renewable Energy LaboratoryGoldenCO 80401USA Department of Mechanical and Aerospace Engineering Benjamin M.Statler College of Engineering and Mineral ResourcesWest Virginia UniversityMorgantownWV 26506USA Department of NanoEngineering University of California San DiegoLa JollaCA 92093USA

Entropic stabilized ABO_(3) perovskite oxides promise many applications,including the two-step solar thermochemical hydrogen(STCH)*** binary and quaternary A-site mixed{A}FeO_(3) as a model system,we reveal that as more cation types,especially above four,are mixed on the A-site,the cell lattice becomes more cubic-like but the local Fe–O octahedrons are more *** comparing four different Density Functional Theory-informed statistical models with experiments,we show that the oxygen vacancy formation energies(E^(f)_(V))distribution and the vacancy interactions must be considered to predict the oxygen non-stoichiometry(δ)*** STCH applications,the E^(f)_(V) distribution,including both the average and the spread,can be optimized jointly to improveΔδ(difference ofδbetween the two-step conditions)in some hydrogen production *** model can be used to predict the range of water splitting that can be thermodynamically improved by mixing cations in{A}FeO_(3) perovskites.

关键词： perovskite vacancy oxides

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Low-frequency and dual-band microwave absorption properties of novel VB-group disulphides(3R–TaS_(2))nanosheets

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Nano materials science 2024年第5期6卷 635-646页

作者： Liquan Fan Honglin Ai Meiye Jiao Yao Li Yongheng Jin Yiru Fu Jing Wang Yuwei Wang Deqing Zhang Guangping Zheng Junye Cheng College of Materials Science and Engineering Heilongjiang Provincial Key Laboratory of Polymeric Composite MaterialsQiqihar UniversityNo.42Wenhua StreetQiqihar161006PR China Department of Materials Science Shenzhen MSU-BIT UniversityShenzhenGuangdong Province517182PR China Department of Mechanical Engineering Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

As electromagnetic technology advances and demand for electronic devices grows,concerns about electromagnetic pollution *** has spurred focused research on innovative electromagnetic absorbers,particularly chalcogenides,noted for their superior absorption *** this study,we successfully synthesize 3R–TaS_(2)nanosheets using a straightforward calcination method for the first *** nanosheets exhibit significant absorption capabilities in both the C-band(4–8 GHz)and Ku-band(12–18 GHz)frequency *** optimizing the calcination process,the complex permittivity of TaS_(2)is enhanced,specifically for those synthesized at 1000℃for 24 *** nanosheets possess dual-band absorption properties,with a notable minimum reflection loss(RLmin)of41.4 dB in the C-band,and an average absorption intensity exceeding 10 dB in C-and Ku-bands,in the absorbers with a thickness of 5.6 ***,the 3R–TaS_(2)nanosheets are demonstrated to have an effective absorption bandwidth of 5.04 GHz(3.84–8.88 GHz)in the absorbers with thicknesses of 3.5–5.5 *** results highlight the multiple reflection effects in 3R–TaS_(2)as caused by their stacked structures,which could be promising low-frequency absorbers.

关键词： 3R-TaS_(2) Nanosheets Electromagnetic wave absorption Reflection loss

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Application of SiC and Graphite reinforced Aluminium Metal Matrix Composite in Braking Systems and its Validation Through Finite Element Analysis

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Journal of The Institution of Engineers (India): Series D 2023年第2期104卷 449-464页

作者： Chatterjee, Arpita Sen, Soumyadeep Paul, Subhodeep Roy, Pallab Sutradhar, Goutam Ghosh, Manojit Department of Mechanical Engineering Dr. Sudhir Chandra Sur Institute of Technology and Sports Complex Kolkata India Department of Mechanical Engineering National Institute of Technology Manipur Imphal India Department of Mechanical Engineering Budge Budge Institute of Technology Kolkata India Department of Metallurgy and Materials Engineering Indian Institute of Engineering Science and Technology Shibpur Howrah India

Smooth and efficient braking has always been a crucial factor to influence the efficiency of an automobile. This factor has prompted several researchers to indulge in the never-ending chase for a constant development and innovation in the domain of braking systems. Recent progress in this field is evident from the implementation of the new disc brake systems replacing the conventionally used drum type brakes. However, the conventionally existing disc braking systems are continuously exposed to the significant thermal and mechanical stresses that causes structural deformation, overheating, thermal cracking, and squeals of the rotor, which pose a threat to the lifetime and future performance of the rotor pads. Generally, in industrial automobiles, grey cast iron is used as rotor material since it exhibits positive results to thermal and mechanical loads, however investigations demonstrated that superior results can be obtained using other materials as well. Hence in the present study, an attempt to use SiC/Graphite reinforced Aluminium alloy (LM6) as an efficient alternative has been made. Consequently, the performance of the fabricated material was initially estimated through several thermal and mechanical investigations of tensile tests, compression tests, thermal conductivity, thermo-mechanical analysis and differential scanning calorimetry. Moreover, with an intention to validate the experimental observations, and to predict the real-life performance, finite element analysis on disc brake rotor of Maruti Alto 800 was conducted. The 3D model of the rotor was designed on Catia V5R20 using actual measurements of the disc brake prototype. This 3D model and measured parameters were used as an input feed for the accurate simulation of modal, structural and thermal behaviour in ANSYS 18.1 FEA software. The results of the experimentations were observed to be in good agreement with the simulation results, indicating the accuracy of the experimental predictions. © 2022, The

关键词： Differential scanning calorimetry

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