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The Forming of Amorphous Alloy Parts: a Technological Review

Cailiao Daobao/materials Reports 2020年第2期34卷 03133-03141页

作者： Ding, Huaping Gong, Pan Yao, Kefu Deng, Lei Jin, Junsong Wang, Xinyun State Key Laboratory of Material Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China School of Materials Science and Engineering Tsinghua University Beijing100084 China

As a new class of materials with excellent properties and different structure compared to traditional crystal metals, amorphous alloys have been attracting great interest from condensed matter physicists and materials scientists. In recent decades, the basic theoretical research and preparation technology of amorphous alloys have made great progress. Amorphous alloys, which posses wide application prospects as structural materials and functional materials, are gradually moving from laboratory to commercial applications and promoting the development of science and technology. To realize the commercial application of a new material, it is necessary to have high productivity and low-cost manufacturing technology of parts. However, as the preparation of amorphous alloys requires rapid cooling rate, high vacuum, high purity raw materials, the cost is relatively high. Moreover, the high strength and high brittleness at room temperature make the amorphous alloys difficult to be machined, while crystallization is easy to occur during the thermoplastic forming process. In brief, it is still difficult to fabricate amorphous alloy parts with large size and complex shape, which seriously restricts the wide application of amorphous alloys. Thus, it has become an important subject for scholars to develop the novel part forming technologies according to the characteristics of amorphous alloy. With the appearance of alloy system with strong amorphous forming ability, the forming technology of amorphous alloy parts has also been greatly developed. At present, the forming technology of amorphous alloys mainly includes casting forming, thermoplastic forming, welding, powder sintering, additive manufacturing technology, etc. The size limit of the formed part spans from nanometer to centimeter, and the complexity, preparation and forming efficiency are also greatly improved. However, each forming technology has some limitations in forming efficiency, size, performance and cost, which ma

关键词： 3D printers

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Effect of heat treatment on microstructure and properties of single crystal copper cold-welded joints

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China Welding 2019年第2期28卷 1-9页

作者： Huang Yong Ran Xiaolong Yan Xiaojuan Guo Tingbiao School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China Key Laboratory of Nonferrous Metal Alloys and Processing Lanzhou University of TechnologyLanzhou 730050China

With the means of electron backscattered diffraction(EBSD),mechanical properties test and digital eddy current metal conductivity,the single crystal copper cold-welded joint was tested and analyzed,the structure change of cold-welded joint and the effect of heat treating on the structure and property of cold-welded joint were *** results show that:The deformation area of the single crystal copper cold welded joint is broken,the crystalline grain at the interface of the joint is refined,and the single crystal structure is still maintained in the base metal *** hardness of the deformation area increases greatly,the conductivity of the joint does not change much,and the tensile strength of the joint reaches about 70%of that of the base *** the interface of the heat treating joint,the single crystal structure of the deformation area and the base metal area are destroyed,and the grains grow up at the interface and the orientation is *** hardness of the joint interface is much lower than that of the non-heat treating joint,the electrical conductivity of the joint is good,and the tensile strength of the joint is higher than that of the base metal.

关键词： single crystal copper cold pressure welding heat treatment conductivity

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High-performance bifunctional polarization switch chiral metamaterials by inverse design method

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npj Computational materials 2019年第1期5卷 324-331页

作者： Chuanbao Liu Yang Bai Ji Zhou Qian Zhao Yihao Yang Hongsheng Chen Lijie Qiao Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory of Environmental Fracture(Ministry of Education) Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of New Ceramics and Fine Processing Tsinghua UniversityBeijing 100084China State Kay Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory for Modern Optical Instrumentation Zhejiang UniversityHangzhou 310027China

Multifunctional polarization controlling plays an important role in modern photonics,but their designs toward broad bandwidths and high efficiencies are still rather ***,by applying the inverse design method of model-based theoretical paradigm,we design cascaded chiral metamaterials for different polarization controls in oppositely propagating directions and demonstrate their broadband and high-efficiency performance theoretically and *** with the derivation of scattering matrix towards specified polarization control,a chiral metamaterial is designed as a meta-quarter-wave plate for the forward propagating linearly polarized wave,which converts the x-or y-polarized wave into a nearly perfect left-or right-handed circularly polarized wave;intriguingly,it also serves as a 45°polarization rotator for the backward propagating linearly polarized *** bifunctional metamaterial shows a high transmission as well as a broad bandwidth due to the Fabry–Perot-like interference *** the similar approach,an abnormal broadband meta-quarter-wave plate is achieved to convert the forward x-and y-polarized or the backward y-and x-polarized waves into left-and right-handed circularly polarized waves with high transmission *** integration of multiple functions in a single structure endows the cascaded chiral metamaterials with great interests for the high-efficiency polarization-controlled applications.

关键词： chiral polarized inverse

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One Dimensional Nanomaterials for Emerging Energy Storage

One Dimensional Nanomaterials for Emerging Energy Storage

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中国化学会第十届全国无机化学学术会议

作者： Liqiang (Mai) State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

One-dimensional nanomaterials can offer large surface area, facile strain relaxation upon cycling and efficient electron transport pathway to achieve high electrochemical performance. Hence, nanowires have attracted increasing interest in energy related fields. We designed the single nanowire electrochemical device for in situ probing the direct relationship between electrical transport, structure, and electrochemical properties of the single nanowire electrode to understand intrinsic reason of capacity fading. The results show that during the electrochemical reaction, conductivity of the nanowire electrode decreased, which limits the cycle life of the devices. We have developed a facile and high-yield strategy for the oriented formation of CNTs from metal-organic frameworks（MOFs）. The appropriate graphitic N doping and the confined metal nanoparticles in CNTs both increase the densities of states near the Fermi level and reduce the work function, hence efficiently enhancing its oxygen reduction activity. In addition, we demonstrated the critical role of structural HO. The results suggest that the HO-solvated Zn possesses largely reduced effective charge and thus reduced electrostatic interactions with the VO framework, effectively promoting its diffusion. We also identified the exciting electrochemical properties（including high electric conductivity, small volume change and self-preserving effect） and superior sodium storage performance of alkaline earth metal vanadates through preparing CaVO nanowires. Furthermore, a novel assembled nanoarchitecture was also presented, which consists of VO nanoparticles embedded in amorphous carbon nanotubes that are then coassembled within a reduced graphene oxide network. The naturally integrated advantages of each subunit exhibit highly stable and ultrafast sodium-ion storage. Our work presented here can inspire new thought in constructing novel one-dimensional structures and accelerate the development of energy storage applica

关键词： One-dimensional nanomaterials energy storage

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Phase Compositions and Mechanical Properties of Chinese Blue-and-white Porcelain

Phase Compositions and Mechanical Properties of Chinese Blue...

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作者： Gangqin Shao Xiaobin Zhong Xinyi Feng Yong Zhang Can Zhu Zhenchang Zhong Jun Wang Qi Liu Hongbin Li Zhaobiao Qiu Youyan Zhong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Chinese blue-and-white porcelain has engendered a unique appeal and gained a worldwide popularity throughout history, with its unmatched translucency of the body, the shine of the glaze, the permanency of the variegated blue tints, the fineness of decorations and the mysteries behind the manufacturing. Mechanical properties are vital for the manufacturing, transportation and usage of this kind of stunner. In this work, the mechanical properties of Chinese blue-and-white porcelain with Hakka style and Dabu geographical indication were optimized, based on the distinct characteristics of local resources.

关键词： CSW Phase Compositions and Mechanical Properties of Chinese Blue-and-white Porcelain

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Application of finite element analysis in properties test of finger-jointed lumber

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Journal of Bioresources and Bioproducts 2020年第2期5卷 124-133页

作者： Sheng He Lanying Lin Zaixing Wu Zhangmin Chen China National Bamboo Research Center Engineering Technology Research Center for Building and Decorating Materials of BambooState Forestry AdministrationHangzhou 310012China Key Laboratory of Bamboo High-efficient Processing of Zhejiang Province Hangzhou 310012China Research Institute of Wood Industry Chinese Academy of ForestryBeijing 100091China

Finger-jointed lumber production has now become the most extensively used method for spliced lumbers jointing together *** properties of finger-jointed lumber are affected by many different factors such as the *** main mechanical properties to be tested for struc-tural use finger-jointed lumber include the modulus of elasticity in static bending and the bending *** most commonly used method for testing these properties at present is the experi-mental *** this study,we used finite element method to investigate the end-pressure range,the modulus of elasticity in static bending and the bending strength for Pinus sylvistriv ***-jointed lumber under three different fitness ratios(0 mm,0.1 mm,0.3 mm).With finite element analysis(FEA)modelling results compared with the experimental test results,it is possible to find the relationship between these two kinds of results and use the FEA to predict the properties of finger-jointed *** FEA applied in the end pressure tests showed a narrower range com-pared with the modelling *** indicated that the FEA could be used in the prediction of the end pressure for finger-jointed *** modelling results for modulus of elasticity(MOE)test and bending strength(MOR)test showed about 20%discrepancies compared with the experimen-tal ***,the MOE modelling results showed the same trend as experimental results under three different fitness levels while the MOR modelling results showed the different *** can be concluded that the FEA is a feasible way in analysing the properties of finger-jointed lumber if the errors could be eliminated *** modifications should be made in order to realize the prediction of the properties of finger-jointed lumber more accurately.

关键词： Finite element analysis Finger jointed lumber End-pressure Modulus of elasticity in static bending Bending strength

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Large-scale current collectors for regulating heat transfer and enhancing battery safety

Nature Chemical Engineering

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Nature Chemical Engineering 2024年 542-551页

作者： Lun Li Huazhang Zhang Xin Zhao Daping He Wei Shu Zixin Zhang Yu Zhao Xingchuan Li Zongkui Kou Yong Xiao Francis Verpoort Liqiang Mai Jinlong Yang Rui Tan CheeTong John Low Cheng Li Yajun Zhang Hewu Wang Hubei Engineering Research Center of RF-Microwave Technology and Application School of Physics and Mechanics Wuhan University of Technology Wuhan China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing State Key Laboratory of Silicate Materials for Architectures School of Materials Science and Engineering Wuhan University of Technology Wuhan China Guangdong Provincial Key Laboratory of New Energy Materials Service Safety College of Materials Science and Engineering Shenzhen University Shenzhen China Department of Chemical Engineering Swansea University Swansea UK Warwick Electrochemical Engineering Group WMG Energy Innovation Centre University of Warwick Warwick UK School of Vehicle and Mobility Tsinghua University Beijing China

Thermal runaway, a major battery safety issue, is triggered when the local temperature exceeds a threshold value resulting from slower heat dissipation relative to heat generation inside the cell. However, improving internal heat transfer is challenged by the low thermal conductivity of metal current collectors (CCs) and challenges in manufacturing nonmetal CC foils at large scales. Here we report a rapid temperature-responsive nonmetallic CC that can substitute benchmark Al and Cu foils to enhance battery safety. The nonmetallic CC was fabricated through a continuous thermal pressing process to afford a highly oriented Gr foil on a hundred-meter scale. This Gr foil demonstrates a high thermal conductivity of 1,400.8 W m−1K−1, about one order of magnitude higher than those of Al and Cu foils. Importantly, LiNi0.8Co0.1Mn0.1O2||graphite cells integrated with these temperature-responsive foils show faster heat dissipation, eliminating the local heat concentration and circumventing the fast exothermic aluminothermic and hydrogen-evolution reactions, which are critical factors causing the thermal failure propagation of lithium-ion battery packs.

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Quasilinear dispersion in electronic band structure and high Seebeck coefficient in CuFeS2-based thermoelectric materials

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Physical Review materials 2020年第2期4卷 025405-025405页

作者： Hongyao Xie Xianli Su Shiqiang Hao Christopher Wolverton Ctirad Uher Xinfeng Tang Mercouri G. Kanatzidis State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Chemistry Northwestern University Evanston Illinois 60208 USA Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA Department of Physics University of Michigan Ann Arbor Michigan 48109 USA

The earth-abundant natural mineral chalcopyrite CuFeS2 is a potential n-type thermoelectric material because of its large Seebeck coefficient at high carrier concentrations. For a long time, the large Seebeck coefficient of CuFeS2 has been attributed to a large electron effective mass, but the reasons for this and the unusual carrier concentration dependent behavior have rarely been discussed. Here, we systematically investigated the special transport behavior of CuFeS2 and found the classical parabolic band model to be inadequate in explaining it. Our experimental and theoretical studies indicate that there are two flat electronic pockets at the Γ and Z points of the Brillouin zone near the conduction band edge of CuFeS2 that dominate the charge transport. These electronic pockets result from nonparabolic quasilinearly dispersing bands that give rise to a linear wave vector dependent energy (E∼k) and a carrier density dependent effective mass (m*∼m0n1/3). Such a strong carrier concentration dependent carrier effective mass results in the high Seebeck coefficient of CuFeS2 compound under a large carrier density. The work demonstrates that quasilinearly dispersing bands can give strongly enhanced Seebeck coefficient, and could be useful in optimizing the properties of thermoelectric materials.

关键词： Thermoelectric effects

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Si/Cu3_Si@C Composite Encapsulated in CNTs Network as High Performance Anode for Lithium Ion Batteries

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Journal of Wuhan University of technology(materials Science) 2019年第5期34卷 1055-1061页

作者： LU Haoqi XUE Lihong ZHANG Wuxing State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China BTR New Energy Materials Inc. Shenzhen 518106China

Si/Cu3Si@C composites encapsulated in CNTs network(SCC-CNTs) were synthesized via the combination of ball-milling and CVD methods. SCC-CNTs consist of conductive Cu3Si, amorphous carbon layer, cross-linked CNTs, and the etched pores, which can play the synergistic effects on the improvement of electronic conductivity and Li^+ diffusion. The volume expansion of Si anode is also suppressed during the electrochemical process. The SCC-CNTs composites demonstrate a remarkably improved electrochemical performance compared with pure Si, which can deliver a discharge capacity of 2 171 mAh·g^-1 at 0.4 A·g^-1 with ICE of 85.2%, and retain 1197 mAh· g^-1 after 150 cycles. This work provides a facile approach to massively produce the high-performance Si-based anode materials for next-generation LIBs.

关键词： lithium-ion battery anodes silicon-based composite CNTs Cu3Si

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Unveiling the Effect of Solvent Polarity on the Excited state Intramolecular Proton Transfer and Hydrogen Bond Mechanisms of Dhp

SSRN

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SSRN 2022年

作者： Song, Yao-Dong Wang, Qian-Ting Chen, Li School of Electronic Electrical Engineering and Physics Fujian University of Technology Fujian Fuzhou350118 China Fujian Provincial Key Laboratory of Advanced Materials Processing and Application China Sanming University Fujian Sanming365004 China Fujian Provincial Engineering Research Center of Die & Mold China Mould Technology Development Base of Fujian Province China Fuzhou Innovation Platform for Novel Materials and Mould Technology China Fujian University of Technology Fujian Fuzhou350118 China

In this present work, using density functional theory and time-dependent density functional theory, the mechanism of excited state intramolecular proton transfer of DHP in ether, 1-butanol, 1-propanol and acetonitrile phases was systematically studied. The optimized geometry includes normal structure and tautomeric structure. The fluorescence spectrum and visible absorption spectrum calculated based on geometric structure agree with the experimental data. The data of bond lengths and bond angles related to hydrogen bonds indicate that hydrogen bonds are strengthened in the S 1 state. Frontier molecular orbital analysis combined with Hirshfeld's method shows that electron densities are distributed in different solvents. Infrared vibration spectra show that the hydrogen bond strength decreases with the increase of solvent polarity. Finally, through the analysis of the potential energy surface, it is found that the excited state intramolecular proton transfer becomes more and more difficult as the polarity of the solvent increases. © 2022, The Authors. All rights reserved.

关键词： Hydrogen bonds

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