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SSRN 2024年

作者： Li, Jiacheng Xu, Zhigang Peng, Jian Shen, Qiang Wang, Chuanbin State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Guangdong Chaozhou521000 China

The Ta-N layer on the Ta matrix surface was synthesized using microwave plasma nitriding (MPN) to enhance its wear resistance. The effects of holding time on the phase composition, morphology, mechanical properties, friction, and wear of the nitriding layers were systematically examined. The results revealed that nanocrystalline Ta-N layers with a dense surface and low roughness were successfully fabricated. The thickness of the Ta-N layer increased from 0.87 μm to 4.23 μm with prolonged holding time. The hardness of the Ta-N layer increased first and then decreased with the extension of holding time, and reached the maximum at 4h. Friction and wear test results indicated that the Ta-N layer exhibited superior wear resistance at the holding time of 4 h, which was mainly attributed to the synergy of dense structure and the generation of the nanocrystal. In conclusion, the Ta-N layer with the desired hardness and wear resistance was obtained due to MPN treatment, which offered excellent surface protection for the Ta matrix in terms of wear resistance. © 2024, The Authors. All rights reserved.

关键词： Nanocrystals

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Synergistic Regulation of Texture and Low-Angle Grain Boundaries Enables Mechanically Robust P-Type Bi2Te3- Based Compounds with Superior Thermoelectric Performance

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SSRN 2024年

作者： Chen, Shuo Luo, Tingting Li, Junjie Liao, Lin Liu, Yutian Yang, Zhen Zhong, Shenlong Wu, Jinsong Su, Xianli Yan, Yonggao Poudeu, Pierre Ferdinand Poudeu Zhang, Qingjie Tang, Xinfeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Materials Science and Engineering University of Michigan at Ann Arbo Ann ArborMI48109 United States

Structural material parameters such as grain size, texture, and grain boundary species play crucial roles in anisotropic thermoelectric materials. In this study, the underlying mechanism for rational regulation of grain size, texture, and grain boundary species is uncovered. The variations in the plastic deformation capability and the atomic diffusion rates at different extrusion temperatures lead to a competition between dynamic recrystallization (DRX) and grain growth, which allows for quantitative regulation over grain size, texture, and low-angle grain boundaries (LAGBs) in the material. As a result, grain size can be effectively tuned from the nanometer scale to the micrometer scale, with the orientation factor F(110) adjusting from 0.23 to 0.41, and the concentration of LAGBs varying between 10.9% and 25.2%. The sample extruded at 673 K exhibits an average grain size of 800 nm, which contribute to the observed compressive strength of 226 MPa and bending strength of 126 MPa. Additionally, the high texture and high density of LAGBs ensure a high carrier mobility of 247 cm2 V-1 s-1. The ZT value of 1.2 enables micro-TEC modules and conventional TEC modules to achieve maximum temperature differences (ΔTmax) of 60 K and 78 K, respectively, at the hot-side temperature of 300 K. © 2024, The Authors. All rights reserved.

关键词： Compressive strength

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A Strategy to Reduce the Peak Temperature of the Chip Working under Dynamic Power Using the Transient Cooling Effect of the Thin-Film Thermoelectric Cooler

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Journal of Thermal Science 2022年第4期31卷 1094-1105页

作者： WU Yongjia CHEN Sen GONG Tingrui SHI Tianhao ZUO Lei YAN Yonggao FANG Yueping MING Tingzhen School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China Microsystem&Terahertz Research Center China Academy of Engineering PhysicsChengdu 610200China Department of Mechanical Engineering Virginia TechBlacksburgVA 24060USA State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Energy Construction and Environment Coventry UniversityCoventry CV15FBUK

The thin-film thermoelectric cooler(TEC)is a promising solid-state heat pump that can remove the high local heat flux of chips utilizing the Peltier *** an electric current pulse is applied to the thin-film TEC,the TEC can achieve an instantaneous lower temperature compared to that created by a steady *** this paper,we developed a novel strategy to reduce the peak temperature of the chip working under dynamic power,thus making the semiconductor chip operate reliably and efficiently.A three-dimensional numerical model was built to study the transient cooling performance of the thin-film TEC on *** effects of parameters,such as the current pulse,the heat flux,the thermoelement length,the number of thermoelements,and the contact resistance on the performance of the thin-film TEC,were *** results showed that when a current pulse of 0.6 A was applied to the thin-film TEC before the peak power of the chip,the peak temperature of the chip was reduced by more than 10℃,making the thin-film thermoelectric cooler a promising technology for the temperature control of modern chips with high peak powers.

关键词： temperature control transient cooling thermoelectric cooler heat transfer

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Hetero-phase MoC-Mo_(2)C nanoparticles for enhanced photocatalytic H_(2)-production activity of TiO_(2)

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Nano Research 2021年第4期14卷 1095-1102页

作者： Jinfeng Liu Ping Wang Jiajie Fan Huogen Yu Jiaguo Yu School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Hexagonal molybdenum carbide(Mo_(2)C)as an effective non-noble cocatalyst is intensively researched in the photocatalytic H_(2)-evolution field owing to its Pt-like H^(+)-adsorption ability and good ***,hexagonal Mo_(2)C-modified photocatalysts possess a limited H_(2)-evolution rate because of the weak H-desorption *** improve the activity,cubic MoC was introduced into Mo_(2)C toform the carbon-modified MoC-Mo_(2)C nanoparticles(MoC-Mo_(2)C@C)by a calcination *** resultant MoC-Mo_(2)C@C(ca.5 nm)was eventually coupled with Ti0_(2)to acquire high-efficiency Ti0_(2)/MoC-Mo_(2)C@C by electrostatic *** highest H_(2)-generation rate of Ti0_(2)/MoC-Mo_(2)C@C reached of 918μmol·h^(-1)·g^(-1)which was 91.8,2.7,and 1.5 times than that of the Ti0_(2),TiO_(2)/MoC@C,and Ti0_(2)/Mo_(2)C@C,*** enhanced rate of Ti0_(2)attributes to the carbon layer as cocatalyst to transmit electrons and the hetero-phase MoC-Mo_(2)C as H_(2)-generation active sites to boost H_(2)-evolution *** research offers a novel insight to design photocatalytic materials for energy applications.

关键词： TiO_(2) MoC-MO_(2)C@C cocatalyst H_(2)evolution photocatalysis

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Aromaticity Concerto in Polycyclic Conjugated Hydrocarbons:Fusion Pattern on Combined Aromaticity Strategy Leads to Distinctive Excited state Photophysics of Dinaphthopentalenes

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CCS Chemistry 2023年第10期5卷 2264-2276页

作者： Long Wang Lu Lin Teng-Shuo Zhang Shaoting Guo Zuyuan Liu Mengfan Zhang Senhao Wang Ganglong Cui Wei-Hai Fang Jun Zhu Hongbing Fu Jiannian Yao Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationCollege of ChemistryTaiyuan University of TechnologyTaiyuan 030024 State Key Laboratory of Physical Chemistry of Solid Surfaces Fujian Provincial Key Laboratory of Theoretical and Computational ChemistryDepartment of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005 State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology College of Chemical EngineeringZhejiang University of TechnologyHangzhou 310014 Key Laboratory of Theoretical and Computational Photochemistry Ministry of EducationCollege of ChemistryBeijing Normal UniversityBeijing 100875 Beijing Key Laboratory for Optical Materials and Photonic Devices Department of ChemistryCapital Normal UniversityBeijing 100048 Beijing National Laboratory for Molecules Science Key Laboratory of PhotochemistryInstitute of ChemistryChinese Academy of SciencesBeijing 100190

Understanding the structure-property relationships in polycyclic conjugated hydrocarbons(PCHs)is crucial in controlling their electronic properties and developing new optically functional *** is a fundamentally important and intriguing property of numerous organic chemical structures and has stimulated a myriad of experimental and theoretical *** aromaticity rules for the rational design of optoelectronic materials with the desired photophysical characteristics is a challenging yet fascinating *** we present an in-depth computational and spectroscopic study on the structure-property relationships of dinaphthopentalenes(DNPs).Results highlight that the different fusion patterns between 4nπand 4n+2πunits endow these PCHs with the tunable aromaticity in the ground state/excited state,which leads to the diverse electronic structures and consequently the distinctive excited state ***,we propose a combined aromaticity design strategy for rationally modulating and tailoring electronic and optical properties of PCH *** outcomes not only present a full picture of the excited state dynamics of the DNP system and afford a new class of efficient singlet fission-active materials but also provide some basic guidelines for exploiting aromaticity rules to design and develop new optical function materials.

关键词： polycyclic conjugated hydrocarbon aromaticity fusion pattern excited state photophysics singlet fission combined aromaticity design strategy optical function materials

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The effect of activating fluxes on the cathode spots in the activating TIG welding

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China Welding 2023年第1期32卷 7-17页

作者：黄勇王伯洋郭建航刘永刚黄健康樊丁余淑荣 School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Mechanical and Electrical Engineering Lanzhou University of TechnologyLanzhou 730050China

The cathode spots are a common phenomenon in the TIG(tungsten inert gas)welding ***,it is rarely observed in the activating TIG welding *** research is mainly focused on the effect of activating flux on cathode spots in the activating TIG *** characteristics and behaviors of cathode spots were investigated in activating TIG welding by the high-speed camera and the *** kinds of oxide(TiO_(2),SiO_(2),MnO_(2))and two halide(MnCl_(2),CaF_(2))activating fluxes are used in the activating TIG welding *** results show that differ from the TIG welding,the oxide activating flux increases the number of cathode spots and decreases the *** effect is the opposite for the halide activating ***,the number of spots no longer varies with the current except TiO2 activating *** the temperature of the weld pool surface increases the spot moves away from the *** this rule is not valid when silica and manganese compounds activating fluxes are *** variation of cathode spots is caused by the oxide film reformed and the distribution of weld *** formation mechanism of cathode spots might be the impact of ions on the cathode surface and the strong electric field formed near the cathode surface.

关键词： cathode spots behaviors activating tungsten inert gas welding high-speed photography spectrum

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Compressive deformation-induced hierarchical microstructure in a TWIPβTi-alloy

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Journal of materials Science & technology 2022年第17期112卷 130-137页

作者： Jinyong Zhang Bingnan Qian Wang Lin Ping Zhang Yijin Wu Yangyang Fu Yu Fan Zheng Chen Jun Cheng Jinshan Li Yuan Wu Yu Wang Fan Sun School of Materials and Physics China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Chimie ParisTech-CNRS Institut de Recherche de Chimie ParisPSL Research UniversityParis 75005France Shaanxi Key Laboratory of Biomedical Metal Materials Northwest Institute for Non-ferrous Metal ResearchXi’an 710016China Beijing General Research Institute of Mining and Metallurgy Beijing 102206China

The deformation mode of{332}twinning(hereafter called 332T)has often been observed under the plastic flow in metastableβtitanium alloys with body-centered cubic(BCC)structure,which contributes to improving the mechan... 详细信息

The deformation mode of{332}<113>twinning(hereafter called 332T)has often been observed under the plastic flow in metastableβtitanium alloys with body-centered cubic(BCC)structure,which contributes to improving the mechanical ***,we report a structure of compressive deformation-induced primary 332T with hierarchical and/or heterogeneous composite sub-structure in a Twin-Induced Plasticity(TWIP)βTi-alloy under uniaxial *** detailed structural characterization after compressive deformation revealed that the sub-structure,including secondary 332T and secondary{112}<111>twinning,formed inside the 332T structure,which constitutes a hierarchical and/or heterogeneous structure at micro-and nano-scale and consequently contributes to the high strength,large ductility and enhanced strain-hardening behavior.

关键词： MetastableβTi-alloys TWIP effects Compression deformation behavior Microstructural characterization

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Mesoporous carbon layer encapsulated SnSe nanosheets via covalent bonds for high-performance sodium ion batteries

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ChemPhysMater 2023年第2期2卷 164-171页

作者： Mengfei Wang Liang Yang Maocheng Liu School of Mechanical and Electrical Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China

Sodium ion batteries(SIBs)have been widely studied because of their low cost,low standard redox potential,and abundant sodium ***,the structural rupture during the Na+insertion/extraction processes and the poor conductivity of the anode material limit its cycling stability and rate ***,SnSe@C was prepared by high-temperature annealing with dopamine hydrochloride as the carbon source,while SnSe was prepared by a protein reduction *** carbon layer not only works as a protective layer to limit the volume expansion of SnSe and reduce the dissolution of Na 2 Se and poly-selenides generated during the discharge process in the electrolyte,but also as a conductive matrix to expedite electron transfer,thereby boosting the cycling stability and rate capability of SnSe@*** from the above advantages,SnSe@C exhibits a specific capacity of 211.3 mAh g^(−1) at 0.1 A g^(−1) after 110 cycles and outstanging rate capability(210.1 mAh g^(−1) at 5.0 A g^(−1) and capacity retention rate of 63.2%from 0.1 to 1.0 A g^(−1)).This study not only proposes an idea for promoting the cycling stability and rate capability of SnSe,but also paves the way for providing anodic materials with a stable structure for SIBs.

关键词： Sodium ion batteries Protein reduction method SnSe nanosheets High conductivity

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Fracture mechanism of alumina-spinel castables containing ZrO2 by wedge splitting test and digital image correlation technique

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Ceramics International 2022年第11期48卷 15430-15438页

作者： Zhang, Liyuan Yu, Renhong Li, Jiwei Zhou, Jiwei Liu, Pengcheng Cao, Yingnan Zhang, Xiaohui Pan, Liping High Temperature Materials Research Institute Henan University of Science &Technology Luoyang471003 China Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology Luoyang471023 China State Key Laboratory of Advanced Refractories Sinosteel Luoyang Institute of Refractories Research Co. Ltd. Luoyang471039 China The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Wuhan430081 China

To clarify the fracture mechanism of alumina-spinel castables, two kinds of alumina-spinel castables with or without fused zirconia-alumina (FZA) were prepared. The full-field strains and crack propagation process in the region of interest (ROI) of alumina-spinel castables were investigated by wedge splitting test (WST) and digital image correlation (DIC) technique. Fractographic methods were used to analyze the crack propagation path of the castables after the WST. The results indicated that the load-displacement curve of alumina-spinel castables containing FZA exhibits a non-linear fracture, demonstrated typical ductile fracture;while that of alumina-spinel castables without FZA is linear, showed typical brittle fracture. The characteristic length reaches to 258.9 mm in FZA containing castables, more than 4 times that of the castables without FZA. In contrast, castables containing FZA has longer and more tortuous crack propagation path, larger damage zone length, which results in the increase of the dissipated energy. Crack branching can be observed around the main crack in castables containing FZA, meaning that microcracks toughening is the main mechanism for flexibility improvement of the alumina-spinel castables containing FZA, formation of micro-cracks can be attributed to the martensitic transformation of zirconia. © 2022 Elsevier Ltd and Techna Group S.r.l.

关键词： Image correlation

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Tailoring Microstructure and Mechanical Property of Pure Tungsten Via Laser Powder Bed Fusion

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SSRN 2023年

作者： Xiong, Zhengang Ma, Wenyou Deng, Zhaoyang Yu, Chunfeng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Institute of New Materials Guangdong Academy of Sciences Guangzhou510650 China

Microstructure tailoring is a fascinating project for material scientists that enables the mechanical properties of metallic parts to be customized. In this study, a series of laser parameter settings were implemented to manufacture dense tungsten parts and three laser travelling strategies were developed to tailor the microstructure via laser powder bed fusion (LPBF). A novel brick-stacking structure and interlocked S-shaped grains were observed in these dense samples. Among different strategy tungsten builds, typical indentation size effect (ISE) was found based on the indentation responses. As-measured indentation hardness could be thought of the sum of contribution from surface and volume. Although their ISE was similar, the contribution from plastically volume work varied, which could be primarily interpreted by rotation strategy. The rotation strategy significantly reduced the grain size and thermal stress during laser manufacturing, resulting in higher true hardness (~ 3.5 GPa). Additionally, the compression properties and associated fracture behavior of tungsten specimens manufactured by the different strategies were also compared. Therefore, these findings show that controlling laser travelling strategy during the LPBF process could be a powerful avenue to tailor the microstructure and performance of the customized components. © 2023, The Authors. All rights reserved.

关键词： Hardness

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