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Relationship between solidification path,microstructure evolution and solidification cracking behavior of Mg-Al-Ca alloy during TIG welding

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Journal of materials science & technology 2024年第15期182卷 176-186页

作者： Sensen Chai Qingwei Dai Shiyu Zhong Qingshan Yang Limeng Yin Dingfei Zhang Jingkai Feng Qian Li School of Metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing 401331China College of Materials Science and Engineering Chongqing UniversityChongqing 400045China Department of Mechanical Engineering City University of Hong KongHong Kong 999077SARChina XI’AN Rare Metal Materials Institute Co. Ltd.Xi’an 710016China State Key Laboratory of Advanced Special Steels&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai UniversityShanghai 200444China National Engineering Research Center for Magnesium Alloy Chongqing UniversityChongqing 400044China National Key Laboratory of Advanced Casting Technologies Chongqing UniversityChongqing 400044Chi

The high-strength and creep-resistant Mg-Al-Ca-Mn alloys have broad application ***,solidification cracking occurs in these alloys in certain conditions and the origin is still *** work investigated the relationship between the solidification path,microstructure evolution and solidification cracking behavior of the Mg-xAl-2Ca-Mn alloys during tungsten inert gas(TIG)*** show that when the fusion zone’s Ca/Al mass ratio ranges from 0.4 to 1.64,solidification cracking occurs at a Ca/Al mass ratio of∼*** the Ca/Al mass ratio approaches this value,the grain size increases,and the Laves phases are reduced *** early formed Laves phases play an important role in promoting dendrite segmentation,refining grain size and enhancing grain *** a solidification path delays the formation of Laves phases,the Laves phases will be reduced accompanied by grain *** such a solidifying microstructure,intergranular cavitation is easy to occur,and the resistance of the semi-solid alloy to crack propagation is severely reduced.

关键词： Magnesium alloy Welding Solidification cracking Solidification path Laves phase

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Impact Performance Research of Re-Entrant Octagonal Negative Poisson’s Ratio Honeycomb with Gradient Design

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Computer Modeling in engineering & sciences 2024年第9期140卷 3105-3119页

作者： Yiyuan Li Yongjing Li Shilin Yan Pin Wen Department of Engineering Structure and Mechanics Wuhan University of TechnologyWuhan430070China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of ScienceWuhan University of TechnologyWuhan430070China

Based on the traditional re-entrant honeycomb,a novel re-entrant octagon honeycomb(ROH)is *** deformation mode of the honeycomb under quasi-static compression is analyzed by numerical simulation,and the results are in good agreement with the experimental *** deformation modes,mechanical properties,and energy absorption characteristics of ROH along the impact and perpendicular directions gradient design are investigated under different *** results indicated that the deformation mode of ROH is affected by gradient design along the direction of impact and impact *** addition,gradient design along the direction of impact can increase the initial peak stress of ROH and accelerate its densification *** design perpendicular to the impact direction can enhance the energy absorption performance of ROH,especially for ROH,with wall thickness increasing from the inside *** to ROH with uniform wall thickness at the same relative density,ROH with a gradient design can increase the plateau stress by over *** the elevation of impact velocity,the plateau stress and specific energy absorption exhibit an upward trend,aligning with the dynamic performance pattern observed in conventional *** results can be used as a reference for the design and application of honeycomb and provide a new idea for developing more efficient and reliable energy-absorbing materials.

关键词： Re-entrant honeycomb gradient design finite element analysis additive manufacturing technologies

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Direct synthesis of millimeter-sized hexagonal diamond from graphite

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science Bulletin 2025年第8期70卷 1257-1263页

作者： Xiaohong Yuan Guwen Chen Yong Cheng Shengcai Zhu Fuyang Liu Yujiao Ke Kuo Hu Yue Pan Ming-Sheng Wang Zhaodong Liu Hu Tang Bingbing Liu State Key Laboratory of High Pressure and Superhard Materials Synergetic Extreme Condition High-Pressure Science CenterCollege of PhysicsJilin UniversityChangchun 130012China School of Materials Shenzhen Campus of Sun Yat-sen UniversityShenzhen 518107China Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005China Center for High Pressure Science and Technology Advanced Research Beijing 100094China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China

Diamond has the strongest three-dimensional network structure and its cubic configuration is extremely stable under high pressure,thus limiting the experimental synthesis of diamond *** diamond,a typical polymorph of diamond,has attracted considerable attention in recent decades,yet synthesizing pure and large-sized hexagonal diamond remains technically challenging,preventing an accurate understanding of its properties and formation ***,we report the direct synthesis of millimeter-sized,nearly pure hexagonal diamond from graphite under high-pressure and high-temperature conditions using our developed high-pressure technique in a multi-anvil *** synthesized hexagonal diamond is highly oriented polycrystalline,exhibiting an ultrahard hardness(165±4 GPa)on(100)planes,which is∼50%harder than single-crystal cubic *** characterizations and molecular dynamics simulations indicate that hexagonal diamond is formed through a martensitic transformation process whereby hexagonal graphite is transformed into hexagonal diamond by sliding and then direct bonding between graphite ***,we show that the transformations from graphite to cubic or hexagonal diamonds are strongly temperature-pressure *** this understanding,we further synthesized cubic/hexagonal diamond composites with unusual heterostructures at a lower *** work not only established a fundamental framework for high-pressure phase transformations in graphite but also provided insight into the structural evolution of two-dimensional materials at high pressures and a potent strategy for exploring their new high-pressure phases.

关键词： Graphite Hexagonal diamond Phase transformation High pressure MD simulation

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Synthesis of a novel Al foam with a periodic architecture by introducing hollow Al tubes and Al/Mg powders

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Journal of materials science & technology 2023年第17期148卷 105-115页

作者： Zhigang Xu Dayong Shen Kai Wang Peng He Jian Zhang Hao Zhang Peng Cao Shangyu Huang Jian Peng Qiang Shen Chuanbin Wang Lianmeng Zhang Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Wuhan Second Ship Design and Research Institute Wuhan 430205China Department of Chemical and Materials Engineering University of AucklandPrivate Bag 92019Auckland 1142New Zealand

In this work,we synthesized a brand-new Al foam with a periodic structure via a simple powder metallurgical *** periodic architecture consists of both hierarchical porous and bi-directional composition-graded *** results show that the hierarchical porous material includes large pores on millimeter scale inheriting from the hollow structure of the Al tubes,and small pores on mi-crometer scale produced by the sintering of Al/Mg *** bi-directional Mg concentration-graded structure is formed in the tube walls due to the condensation of Mg vapor in the inner tube *** addition of Mg powders achieves excellent metallurgical bonding between the Al powders and the hollow tubes at 550℃.The plateau stress and energy absorption capacity of the Al foam in y-axis compression are significantly higher than that in the x-axis due to their anisotropic *** general,the Al foam with Mg addition presents the most superior compression performance,and we believe that our find-ings could open up a unique strategy for developing high-performance metallic foams with the periodic architecture involving both hierarchical porous and bi-directional graded structure.

关键词： Al foam Hollow Al tube Mg evaporation Bi-directional composition-graded structure Compression properties Energy absorbing performance

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Flexible mica films coated by magnetron sputtered insulating layers for high-temperature capacitive energy storage

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SusMat 2024年第5期4卷 154-162页

作者： Chao Yin Tiandong Zhang Changhai Zhang Yue Zhang Chang Kyu Jeong Geon-Tae Hwang Qingguo Chi Key Laboratory of Engineering Dielectrics and its Application Ministry of EducationHarbin University of Science and TechnologyHarbinChina School of Electrical and Electronic Engineering Harbin University of Science and TechnologyHarbinChina Division of Advanced Materials Engineering Jeonbuk National UniversityJeonjuSouth Korea Department of Materials Science and Engineering Pukyong National UniversityBusanSouth Korea

High-temperature energy storage performance of dielectric capacitors is cru-cial for the next generation of power electronic ***,conduction losses rise sharply at elevated temperature,limiting the application of energy storage ***,the mica films magnetron sputtered by different insulating layers are specifically investigated,which exhibit the excellent high-temperature energy storage *** experimental results revealed that the PbZrO3/Al2O3/PbZrO3(PZO/AO/PZO)interface insulating layers can effec-tively reduce the high-temperature leakage current and conduction loss of the composite ***,the ultrahigh energy storage density(Wrec)and charge‒discharge efficiency(η)can be achieved simultaneously in the flexi-ble mica-based composite ***,PZO/AO/PZO/mica/PZO/AO/PZO(PAPMPAP)films possess excellent Wrec of 27.5 J/cm3 andηof 87.8%at 200◦C,which are significantly better than currently reported high-temperature capaci-tive energy storage dielectric *** with outstanding power density and electrical cycling stability,the flexible films in this work have great appli-cation potential in high-temperature energy storage ***,the magnetron sputtering technology can deposit large-area nanoscale insulating layers on the surface of capacitor films,which can provide technical support for the industrial production of capacitors.

关键词： energy storage high temperature insulating layer magnetron sputtering mica

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A review on additive manufacturing of ceramic matrix composites

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Journal of materials science & technology 2023年第7期138卷 1-16页

作者： Jinxing Sun Daorong Ye Ji Zou Xiaoteng Chen Yue Wang Jinsi Yuan Haowen Liang Hongqiao Qu Jon Binner Jiaming Bai Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China School of Metallurgy and Materials University of BirminghamB152TTUK State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Additive manufacturing(AM)of ceramic matrix composites(CMCs)has enabled the production of highly customized,geometrically complex and functionalized parts with significantly improved properties and functionality,compared to single-phase ceramic *** also opens up a new way to shape damage-tolerant ceramic composites with co-continuous phase reinforcement inspired by natural ***,a large variety of AM techniques has been successfully applied to fabricate CMCs,but variable properties have been obtained so *** article provides a comprehensive review on the AM of ceramic matrix composites through a systematic evaluation of the capabilities and limitations of each AM technique,with an emphasis on reported results regarding the properties and potentials of AM man-ufactured ceramic matrix composites.

关键词： Additive manufacturing Ceramic matrix composites 3D printing Mechanical properties Bioinspired composites

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Porously Reduced 2-Dimensional Bi_(2)O_(2)CO_(3) Petals for Strain-Mediated Electrochemical CO_(2) Reduction to HCOOH

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Energy & Environmental materials 2024年第1期7卷 215-221页

作者： Won Seok Cho Dae Myung Hong Wan Jae Dong Tae Hyung Lee Chul Jong Yoo Donghwa Lee Ho Won Jang Jong-Lam Lee Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang Gyungbuk 37673Korea Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National UniversitySeoul 08826Korea

Here we introduce bismuth-based catalysts for the efficient electrochemical reduction of CO_(2)to formic acid(HCOOH),which are composed of petal-shaped Bi_(2)O_(2)CO_(3)(BOC)that spontaneously formed from Bi thin film in aqueous carbonate solution at room *** the electrochemical reduction process,the BOC petals transform to reduced BOC(R-BOC)consisting of individual BOC and Bi *** mismatch between both domains induces biaxial strain at the *** functional theory calculations suggest that the tensile strain on the Bi domain stabilizes the*OCHO intermediate,reducing the thermodynamic barrier toward CO_(2)conversion to *** with the thermodynamic benefit and the unique nanoporous petal-shaped morphology,R-BOC petals have a superior Faradaic efficiency of 95.9%at-0.8 V_(RHE)for the electrochemical conversion of CO_(2)to *** work demonstrates that the spontaneously formed binary phases with desirable lattice strain can increase the activity of bismuth catalysts to the CO_(2)reduction reaction;such a strategy can be applicable in design of various electrocatalysts.

关键词： bismuth carbon dioxide reduction formic acid heterointerfaces strain

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Semitransparent organic photovoltaics enabled by transparent p-type inorganic semiconductor and near-infrared acceptor

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Journal of Energy Chemistry 2024年第9期96卷 351-358页

作者： Xue Yan Jiayu Wang Wei He Top Archie Dela Peña Can Zhu Hailin Yu Yingyue Hu Cenqi Yan Shengqiang Ren Xingyu Chen Zhe Wang Jiaying Wu Mingjie Li Jianlong Xia Lei Meng Shirong Lu Dewei Zhao Mikhail Artemyev Yongfang Li Pei Cheng College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065SichuanChina Department of Applied Physics The Hong Kong Polytechnic UniversityKowloonHong Kong 999077China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China College of Materials Science and Engineering&Engineering Research Center of Alternative Energy Materials&Devices Ministry of EducationSichuan UniversityChengdu 610065SichuanChina Department of Material Science and Technology Taizhou UniversityTaizhou 318000ZhejiangChina Advanced Materials Thrust Function HubThe Hong Kong University of Science and Technology(Guangzhou)Guangzhou 511400GuangdongChina State Key Laboratory of Advanced Technology for Materials Science and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan 430070HubeiChina Department of Civil1nd Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China Research Institute for Physical Chemical Problems Belarusian State UniversityMinsk 220006Belarus

Semitransparent organic photovoltaics(STOPVs)have gained wide attention owing to their promising applications in building-integrated photovoltaics,agrivoltaics,and floating *** semiconductors with high charge carrier mobility usually have planar and conjugated structures,thereby showing strong absorption in visible *** this work,a new concept of incorporating transparent inorganic semiconductors is proposed for high-performance ***(I)thiocyanate(CuSCN)is a visible-transparent inorganic semiconductor with an ionization potential of 5.45 eV and high hole *** transparency of CuSCN benefits high average visible transmittance(AVT)of *** energy levels of CuSCN as donor match those of near-infrared small molecule acceptor BTP-eC9,and the formed heterojunction exhibits an ability of exciton *** mobility of CuSCN contributes to a more favorable charge transport channel and suppresses charge *** control STOPVs based on PM6/BTP-eC9 exhibit an AVT of 19.0%with a power conversion efficiency(PCE)of 12.7%.Partial replacement of PM6 with CuSCN leads to a 63%increase in transmittance,resulting in a higher AVT of 30.9%and a comparable PCE of 10.8%.

关键词： Copper(I)thiocyanate Inorganic semiconductor Semitransparent Organic photovoltaics Charge dissociation

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High-Performance Semiconducting Carbon Nanotube Transistors Using Naphthalene Diimide-Based Polymers with Biaxially Extended Conjugated Side Chains

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ACS Applied materials and Interfaces 2024年第34期16卷 45275-45288页

作者： Chen, Chun-Chi Su, Shang-Wen Tung, Yi-Hsuan Wang, Po-Yuan Yu, Sheng-Sheng Chiu, Chi-Cheng Shih, Chien-Chung Lin, Yan-Cheng Department of Chemical Engineering National Cheng Kung University Tainan70101 Taiwan Advanced Research Center for Green Materials Science and Technology National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering and Materials Engineering National Yunlin University of Science and Technology Yunlin Douliou64002 Taiwan

Polymer-wrapped single-walled carbon nanotubes (SWNTs) are a potential method for obtaining high-purity semiconducting (sc) SWNT solutions. Conjugated polymers (CPs) can selectively sort sc-SWNTs with different chiralities, and the structure of the polymer side chains influences this sorting capability. While extensive research has been conducted on modifying the physical, optical, and electrical properties of CPs through side-chain modifications, the impact of these modifications on the sorting efficiency of sc-SWNTs remains underexplored. This study investigates the introduction of various conjugated side chains into naphthalene diimide-based CPs to create a biaxially extended conjugation pattern. The CP with a branched conjugated side chain (P3) exhibits reduced aggregation, resulting in improved wrapping ability and the formation of larger bundles of high-purity sc-SWNTs. Grazing incidence X-ray diffraction analysis confirms that the potential interaction between sc-SWNTs and CPs occurs through π-π stacking. The field-effect transistor device fabricated with P3/sc-SWNTs demonstrates exceptional performance, with a significantly enhanced hole mobility of 4.72 cm2 V-1 s-1 and high endurance/bias stability. These findings suggest that biaxially extended side-chain modification is a promising strategy for improving the sorting efficiency and performance of sc-SWNTs by using CPs. This achievement can facilitate the development of more efficient and stable electronic devices. © 2024 The Authors. Published by American Chemical Society.

关键词： Conjugated polymers

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A novel“Snowflake”--rGO-CuO for ultrasonic degradation of rhodamine and methyl orange

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Nano materials science 2024年第3期6卷 365-373页

作者： Yitong Wang Yuhua Wang Zuzhao Xiong Xifei Li Hubei Province Key Laboratory of Science in Metallurgical Process Wuhan University of Science and TechnologyWuhan430081China Department of Engineering and Technology Wuhan College of Foreign Languages&Foreign AffairsWuhan430070China Key Laboratory of Advanced Batteries Materials for Electric Vehicles of China Petroleum and Chemical Industry Federation School of Materials Science and EngineeringXi'an University of TechnologyXi'an710048China

Graphene-doped CuO(rGO-CuO)nanocomposites with flower shapes were prepared by an improved solvothermal *** samples were characterized by X-ray diffraction,X-ray photoelectron spectroscopy and UV–visible *** active species in the degradation reaction of rGO-CuO composites under ultrasonic irradiation were detected by electron paramagnetic *** the basis of comparative experiments,the photodegradation mechanisms of two typical dyes,Rhodamine B(Rh B)and methyl orange(MO),were *** results demonstrated that the doped CuO could improve the degradation *** catalytic degradation efficiency of rGO-CuO(2:1)to rhodamine B(RhB)and methyl orange(MO)reached 90%and 87%respectively,which were 2.1 times and 4.4 times of the reduced graphene *** the first-principles and other theories,we give the reasons for the enhanced catalytic performance of rGO-CuO:combined with internal and external factors,rGO-CuO under ultrasound could produce more hole and active sites that could interact with the OH·in pollutant molecules to achieve *** rGO-CuO nanocomposite has a simple preparation process and low price,and has a high efficiency of degrading water pollution products and no secondary pollution *** has a low-cost and high-efficiency application prospect in water pollution industrial production and life.

关键词： rGO-CuO Nanocomposites Characterization Nanomaterial catalyst First principle

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