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Compressive deformation-induced hierarchical microstructure in a TWIPβTi-alloy

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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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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A universal tactic of using Lewis-base polymer-CNTs composites as additives for high performance cm2-sized and flexible perovskite solar cells

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Science China Chemistry 2021年第2期64卷 281-292页

作者： Chang Liu Jingsong Sun Xiao-Fang Jiang Like Huang Qiang Lou Yi-Bing Cheng Shulin Song Ziyi Ge Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China Department of Materials Science and Engineering Monash UniversityClaytonVictoria3800Australia School of Physics and Telecommunication Engineering South China Normal UniversityGuangzhou510006China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

Lewis-base polymers have been widely utilized as additives to act as a template for the perovskite nucleation/crystal growth and passivate the under-coordinated Pb2+ ***,it is uncovered in this work that the polymer on the perovskite grain boundaries would significantly hinder the charge transport due to its low conductivity,which brings about free carrier recombination and photocurrent *** circumvent this issue while fully exploiting the benefits of polymers in passivating the trap states in perovskite,we incorporate highly conductive multiwall carbon nanotubes(CNTs) with Lewis-base polymers as coadditives in the perovskite *** the CNTs with-COOH group enables a selective hole-extraction and charge transport from perovskite to the hole transporting materials(HTM).By studying the charge transporting and recombination dynamics,we revealed the individual role of the polymer and CNTs in passivating the trap states and facilitating the charge transport,*** a result,the perovskite solar cells(PSCs) with polymer-CNTs composites exhibit an impressive PCE of 21.7% for a small-area device(0.16 cm2) and 20.7% for a large-area device(1.0 cm2).Moreover,due to the superior mechanical flexibility of both polymer and CNTs,the polymer-CNTs composites incorporation in the perovskite film encourages the fabrication of flexible PSCs(f-PSCs) with an impressive PCE of 18.3%,and a strong mechanical durability by retaining 80%of the initial PCE after 1,000 times *** addition,we proved that the selection criteria of the polymers can be extended to other long-chain Lewis-base polymers,which opens new possibilities in design and synthesis of inexpensive material for this tactic towards the fabrication of high performance large-area PSCs and f-PSCs.

关键词： passivation charge transport flexible perovskite solar cells

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

SSRN

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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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Magnetic Units-Ordered Architectonics Triggering Excellent Electric-Thermal Conversion Performance of Thick Films

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SSRN 2024年

作者： Zhang, Haojun Ke, Shaoqiu Kuang, Ziyao Li, Haotian Chen, Tiantian Nie, Xiaolei Zhu, Wanting Wei, Ping He, Danqi Liu, Mingrui Zhao, Wenyu Zhang, Qingjie State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Nanostructure research center Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu 528000 China

The low electrical transport performance of flexible thermoelectric (TE) films is the bottleneck that restricts the development of in-plane heat dissipation technology based on Peltier effect. The architectonics of magnetic materials into TE materials has been proven to be an effective method to improve the efficiency of TE conversion. In this study, a series of Bi0.5Sb1.5Te3 (BST)/Fe-NPs/BST thermo-electromagnetic (TEM) films were successfully prepared by orderly embedding ferromagnetic Fe nanoparticles (Fe-NPs) with different distribution shapes in BST matrix through screen-printing combined with hot-press curing. The study focuses on the influence of the ferromagnetism of Fe-NPs and Fe3O4-NPs -induced thermo-electromagnetic coupling on the microstructure and electro-thermal transport properties of BST. The results reveal a 36.5% enhancement in the maximum power factor (PF) of TEM films structured with Fe-NPs in a rhombic dot matrix sequence, while the applied Fe-NPs has no impact on the thermal conductivity, which remains at 0.94 Wm-1K-1 at room temperature, and the calculated zT value is 0.87 under the room temperature. The single-arm device prepared based on TEM thick films can achieve a cooling effect at 1.8 K, and the design of the in-plane heat dissipation device can realize a cooling efficiency in the cooling region reaching 2.8 K. In this paper, the effect of magnetic order on the electrical transport properties of BST thick films is explained from the point of view of the physical model for the first time. © 2024, The Authors. All rights reserved.

关键词： Thermal conductivity

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Multi-crosslinked network magnesium phosphate bone cement with high flexural properties

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Ceramics International 2025年

作者： Gao, Zijie Liu, Jiawei Zhang, Mingjiang Chen, Pengfei Goto, Takashi Tu, Rong Dai, Honglian State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China National Energy Key Laboratory for New Hydrogen-ammonia Energy Technologies Foshan Xianhu Laboratory Foshan528200 China New Industry Creation Hatchery Center Tohoku University Sendai980-8579 Japan

Magnesium phosphate cement (MPC) is a bone repair material with good early strength, but its low flexural strength limits its application in bone defect regions subjected to multi-directional loads and repeated stresses. Traditional strategies for reinforcing inorganic bone cement, such as lamination, provide excellent mechanical strength but result in the deterioration of other properties. For instance, the reduction in injectability makes it difficult for the bone cement to fill irregular bone defect sites. Therefore, developing a bone cement with high strength, good operability, and biological activity remains a significant challenge. This study aimed to construct a triple-cured gel-based bone cement by incorporating polyurethane-sodium alginate (EPU-SA) emulsion into magnesium phosphate bone cement (TMPC), forming a structurally more continuous and stable interpenetrating triple network composite system (ES-T) during the hydration process. The in-situ reinforcement of TMPC was achieved through the dual effects of physical and chemical interactions. The results showed that the flexural strength of ES-T under humid conditions was 214 % higher than that of TMPC, reaching 50.5 MPa. Interface analysis between organic and inorganic components confirmed the bonding mechanism between the emulsion and bone cement and clarified the reinforcement mechanism. In addition, ES-T demonstrated promotive effects on cellular osteogenic differentiation and generation of new bone tissue by in vitro and in vivo experiments. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Bone cement

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In Situ Transmission Electron Microscopy and Three-Dimensional Electron Tomography for Catalyst Studies

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Chinese Journal of Structural Chemistry 2022年第10期41卷 56-76页

作者： Chen Sun Kuo Liu Jian Zhang Qian Liu Xijun Liu Lili Han College of Chemistry Fuzhou UniversityFuzhou 350116China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Key Laboratory of Spin Electron and Nanomaterials of Anhui Higher Education Institutes Suzhou UniversitySuzhou 234000China Institute for Advanced Study Chengdu UniversityChengdu 610106 China MOE Key Laboratory of New Processing Technology for Non-Ferrous Metals and Materials and Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured MaterialsSchool of ResourceEnvironments and MaterialsGuangxi UniversityNanning 530004China

An in-depth understanding of the catalytic reaction mechanism is the key to designing efficient and stable catalysts. In situ transmission electron microscope(TEM) is the most powerful tool to visualize and analyze the microstructures of catalysts during catalysis. In situ TEM combined with three-dimensional(3D) electron tomography(ET) reconstruction technique enables interrogations of catalysts’ structural dynamics and chemical changes in high temporal and spatial dimensions. In this review, we discuss and summarize the recent advances in in situ TEM together with 3D ET for catalyst studies. Topics include the latest research progress of in situ TEM imaging as well as 3D visualization and quantitative analysis of catalysts. We also pay particular attention to artificial intelligence(AI)-enhanced smart 3D ET. These include deep learning(DL)-based data compression and storage for the analysis of large TEM data, recovery of wedge-shaped information lost in 3D ET reconstructions, and DL models for reducing residual artifacts in 3D reconstructed images. Finally, the challenges and development prospects of current in situ TEM and 3D ET research are discussed.

关键词： in situ TEM catalyst electron tomography 3D reconstruction artificial intelligence machine learning

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Step-scheme CdS/TiO_(2) nanocomposite hollow microsphere with enhanced photocatalytic CO_(2) reduction activity

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Journal of materials Science & technology 2020年第21期56卷 143-150页

作者： Zhongliao Wang Yifan Chen Liuyang Zhang Bei Cheng Jiaguo Yu Jiajie Fan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China

Converting solar energy into chemical energy by artificial photosynthesis is promising in addressing the issues of the greenhouse effect and fossil fuel ***,a novel photocatalyst,***/TiO_(2) hollow microspheres(HS),were dedicatedly designed to boost overall photocatalytic ***_(2) nanoparticles were in-situ decorated on the inside and outside the shell of Cd S HS,ensuring close contact between TiO_(2) and *** CdS/TiO2 HS with abundant mesopores inside of the shell boost the light absorption via multiscattering effect as well as accessible to reactions in all *** heterojunction was scrutinized and the charge transfer across it was revealed by in-situ irradiated X-ray photoelectron spectroscopy(ISI-XPS).Ultimately,the charge transfer in this composite was determined to follow stepscheme mechanism,which not only facilitates the separation of charge carriers but also preserves strong redox *** from the intimate linkage between Cd S and TiO_(2) and the favorable step-scheme heterojunction,enhanced photocatalytic CO_(2) reduction activity was *** CH4 yield rate of CdS/TiO_(2) reaches 27.85μmol g^(–1) h^(–1),which is 145.6 and 3.8 times higher than those of pristine CdS and TiO_(2),*** work presents a novel insight into constructing step-scheme photocatalytic system with desirable performance.

关键词： Step-scheme heterojunction CdS TiO_(2) Hollow microspheres Photocatalytic CO2 reduction

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Pressure-induced cation and vacancy disorder-order transition and near-zero τ_f in deficient hexagonal perovskite Ba8ZnTa6O24 dielectrics

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Science China Chemistry 2025年

作者： Bin Zheng Ruiwen Ji Cécile Genevois Wenda Zhang Xing Ming Qiang Zhang Mathieu Allix Congling Yin Xiaojun Kuang Xianran Xing MOE Key Laboratory of New Processing Technology for Nonferrous Metal and Materials Guangxi Key Laboratory of Optical and Electronic Materials and Devices College of Materials Science and Engineering Guilin University of Technology Centre National de la Recherche Scientifique (CNRS) CEMHTI UPR3079 Université d'Orléans College of Physics and Electronic Information Engineering Guilin University of Technology Neutron Scattering Division Oak Ridge National Laboratory Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources Guilin University of Technology Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials College of Chemistry and BioengineeringGuilin University of Technology Beijing Advanced Innovation Center for Materials Genome Engineering and Institute of Solid-State Chemistry University of Science and Technology Beijing

Pressure applications can enable the tuning of atomic/defect ordering and provide access to new functional materials. Here, we report that pressure-induced structural transformation featuring disorder-order transition of both cations and vacancies in the 8-layer deficient hexagonal perovskite tantalate dielectrics Ba8ZnTa6O24, which transformed the structure from twin to shift and remarkably lowered the temperature coefficient of resonant frequency τ_f down to near zero（～0.56 ppm/°C） from 38 ppm/°C for the twinned precursor. The atomic scale STEM-HAADF and EDS results confirm the ordering of Zn in the Ta host at the nanometer scale in the shifted material featuring well-ordered Ba8ZnTa6O24slabs intergrown with Ba3ZnTa2O9and Ba5Ta4O15monolayers and anti-phase grain boundaries as planar defects. The pressure-induced twin-shift structural transformation of Ba8ZnTa6O24features the rare constant concentration of the hexagonal stacked layers, which is allowed by the vacancy ordering at the central layers of face-shared octahedral（FSO） trimers avoiding the FSO B-B repulsion, and remarkably the faster cationic ordering kinetics compared with the 2:1 ordered complex perovskites. Although the inclusion of numerous planar defects and the oxidizable atomic defects led to significant p-type conduction and inhomogeneous electrical microstructures, resulting in an extraordinarily high extrinsic dielectric loss for the high-pressure shifted Ba8ZnTa6O24pellet, the intrinsically near-zero τ_fcould make the shifted Ba8ZnTa6O24perovskite an ideal microwave dielectric resonator candidate if the defects could be eliminated.

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Application of transparent casting moulds prepared by additive manufacturing technology in hydraulic simulation

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China Foundry 2022年第4期19卷 299-306页

作者： Qian Feng Xing Ran Ke-hui Hu Hao-yuan Wang Zhi-gang Lü State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China AVIC Heavy Machinery Co. Ltd.Guiyang 550005China Key Laboratory of Advanced Materials Processing Technology Ministry of EducationTsinghua UniversityBeijing 100084China

Hydraulic simulation is one of the critical methods to research the filling mechanism of molten metal in the casting ***,it only performs on test pieces with relatively simple structures due to the limitation of the preparation *** this study,the method of photocuring additive manufacturing was used to prepare the complex casting mould from transparent photosensitive *** pouring test was carried out under different centrifugal conditions,and the filling process of the gating system,support bars and other positions in the vertical direction was recorded and *** experimental results show that the internal liquid level and the filling process of the test piece prepared by this method can be observed *** angle between the liquid surface and the horizontal plane in the test piece gradually increases as the centrifugal rotational speed increases,which means the filling process is carried out from outside to inside at high rotational *** velocity of the fluid entering the runner increases with the increase of rotational speed,but the filling speeds is less affected by the centrifugal speed at other *** liquid flow is continuous and stable during the forward filling process,without splashing or interruption of liquid droplets.

关键词： additive manufacturing centrifugal casting investment casting hydraulic simulation transparent mould

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