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Effectively refining Al-10Si alloy via Al-Ti-Nb-B refiner with Nb_(2)O_(5)

Journal of materials science & Technology 2024年第9期176卷 204-210页

作者： Longfei Zhu Yu Zhang Qun Luo Liming Peng Qian Li State Key Laboratory of Advanced Special Steels&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai UniversityShanghai200444China College of Materials Science and Engineering Chongqing UniversityChongqing400044China National Engineering Research Centre of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China National Engineering Research Center for Magnesium Alloy Chongqing UniversityChongqing400044China College of Materials Science and EngineeringChongqing UniversityChongqing400044China National Key Laboratory of Advanced Casting Technologies Chongqing UniversityChongqing400044China

Al-Si alloys have excellent corrosion resistance,low thermal expansion coefficient,and high strength-to-weight ratio,which make them widely used in structural components in the automotive and aerospace industries[1,2].However,the coarseα-Al dendrites result in poor mechanical properties[3,4],and the widely used Al-5Ti-B(all compositions are in wt.%unless otherwise specified)refiner fails in as-cast aluminum alloys with high silicon content(≥5 wt.%)due to the Si-poisoning effect[5,6].Fortunately,in order to overcome Si-poisoning,a series of refiners have been ***-B refiner is effective for refining aluminum alloys with high silicon content,but it is easy to be poisoned by Ti/Zr[7,8].Al-Nb-B[9–11]and Al-V-B[12]refiners have a certain ability to overcome Si-poisoning,while the nucleating particles have a large density and are easy to agglomerate and settle,leading to the grain refinement fading ***-Ti-C-B refiner realizes the anti-Si/Zrpoisoning ofα-Al grain refinement based on the evolving effect of a doped TCB complex[13,14].Al-Ti-Nb-B refiner prepared with Nb partially substituted Ti can improve the refinement level of Al-10Si alloy to 109–125μm[15,16].However,the existing preparation method of the refiner uses pure Nb powder as raw material,resulting in high preparation costs,which limits its application in industry to a certain extent.

关键词： alloy corrosion refinement

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Nanotandem-rocket releases messenger to disrupt metabolic communication for antitumor immunotherapy

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Nano Research 2023年第5期16卷 7095-7107页

作者： Henan Zhao Yuyan Zou Wei Wang Yihong Liu Yuqing Li Bowen Jin Jianghua Li Wansong Chen You-Nian Liu Hunan Provincial Key Laboratory of Micro&Nano Materials Interface Science College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083China

Metabolic communication between intracellular metabolism and extracellular microenvironment is responsible for celluar metabolism balance and cell *** cells adaptively regulate metabolic communication to promote hyperproliferation and ***,nanotandem-rockets(hyaluronic acid modified Mg_(5)(CO_(3))_(4)(OH)_(2)(H-MCH))are developed for stepwisely disrupting metabolic communication to activate antitumor *** from the nanotandem-rocket structure,H-MCH nanoplates successively disrupt the extracellular metabolite transport and intracellular carbohydrate *** simulation together with metabolomic analysis discloses the underlying mechanism of H-MCH *** extra-/intra-celluar interruption of metabolic communication provides H-MCH nanotandem-rockets with high efficiency in tumor ***,the interference of metabolic communication reverses immunosuppression to facilitate the intratumoral infiltration of immune *** H-MCH nanotandem-rockets as an in situ vaccine,systemic antitumor immunity and immune memory effect are fabricated to eliminate tumor metastasis and *** from traditional metabolic poisons(e.g.,arsenic or cyanide),the structure of nanotandem-rockets endows chemical messengers with selective regulation to tumor metabolic communication,but with minimal influence to normal *** nanotandem-rockets provide a powerful paltform to augment the regulating actitiy of chemical messengers in metabolic *** expect our discovery of disrupting tumor metabolic communication with chemical messengers will be a powerful strategy for tumor therapy with vast practical applications.

关键词： nanotandem-rockets metabolic communication messenger carbohydrate metabolism antitumor immunotherapy

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Effect of Curing Age on Tensile Properties of Fly Ash Based Engineered Geopolymer Composites(FA-EGC)by Uniaxial Tensile Test and Ultrasonic Pulse Velocity Method

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Journal of Wuhan University of Technology(materials science) 2023年第6期38卷 1319-1325页

作者： GUO Xiaolu LI Shuyue Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education Tongji UniversityShanghai 201804China School of Materials Science and Engineering Tongji UniversityShanghai 201804China

Tensile properties of fly ash based engineered geopolymer composites(FA-EGC)at different curing ages were studied by uniaxial tensile test and ultrasonic pulse velocity(UPV)methods,which included uniaxial tensile properties,the correlation between ultrasonic pulse velocity and tensile properties,and characteristic parameters of *** experimental results show that obvious strain hardening behavior can be found in FA-EGC at different curing *** the increase of curing age,the tensile strength increases,the tensile strain decreases and the toughness becomes *** UPV of FA-EGC increases with curing age,and a strong correlation can be found between tensile strength and *** the increase of curing age,the average crack width of FA-EGC decreases and the total number of cracks *** is because the strength of geopolymer increases fast at early age,thus the later strength development of FA-EGC tend to be *** the same time,the bond strength between fiber and matrix,and the friction of fiber/matrix interface continue to increase with curing age,thus the bridging effect of fiber is gradually *** conclusion,the increase of curing age is beneficial to the development of tensile properties of FA-EGC.

关键词： engineered geopolymer composites(EGC) tensile properties ultrasonic pulse velocity(UPV) characteristic parameters of microcracks

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Deformation-mediated cyclic evolution of precipitates in Al-Mg-Si-Cu alloy by multi-pass ECAP and thermal treatments

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材料科学技术（英文版） 2025年第10期213卷 42-54页

作者： Yulin Chen Yang Liu Jian Zhang Manping Liu Hui Li Lipeng Ding Zhihong Jia Xiaochun Liu Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology School of Intelligent ManufacturingJiangnan UniversityWuxi 214122PR China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013PR China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240PR China Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology School of Intelligent ManufacturingJiangnan UniversityWuxi 214122PR China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013PR China Key Laboratory for Microstructure Shanghai UniversityShanghai 200444PR China Key Laboratory for Light-weight Materials Nanjing Tech UniversityNanjing 211816PR China Institute of Metals College of Materials Science and EngineeringChangsha University of Science & TechnologyChangsha 410004PR China

Precipitation via thermal treatments is among the most effective approaches to strengthening and is widely applied in the Al *** treatments combined with deformation are capable of finely regulating the process of precipitation and distribution of ***-induced defects exert significant impacts on the precipitation and already present precipitates,which however is often *** this study,the interactions between deformation and precipitation/precipitates,and their im-pacts on mechanical properties were systematically investigated in the solution-treated(ST)Al-0.61Mg-1.17Si-0.5Cu(wt.％),processed by multi-pass equal channel angular pressing(ECAP)and thermal *** deformation-mediated cyclic evolution of precipitates is discovered:ST→(1,2 passes:de-formation induced precipitation)Guinier Preston(GP)zones→(An250/30)Q'and L phases→(3-pass:deformation induced fragmentation/resolution)spherical precipitates→(4-pass:deformation induced fur-ther fragmentation/resolution)GP *** this basis,we extend the quasi-binary phase diagram of Al-Mg2Si along deformation as the third dimension and construct an innovative defect phase diagram for the Al-Mg-Si-based *** testify to the effect of deformation-mediated cyclic evolution of pre-cipitation/precipitates on the optimum mechanical properties,peak-aging treatments were performed in samples of ST and 3-pass *** on the microscopic characterizations,a distinctive mechanism of peak-aging strengthening is *** in the 3-pass ECAPed and peak-aged sample the dominant strengthening phases become the L precipitates that thrived from the segmented and spherical L phases,rather than β"precipitates in the solely peak-aged ST *** work provides a feasible example for exploring the combined processing technique of multi-step deformation and thermal treatments,to optimize the mechanical properties.

关键词： Al-Mg-Si-Cu alloys Precipitations Equal channel angular pressing Defect phase diagram Microstructure

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Phase field modeling of grain stability of nanocrystalline alloys by explicitly incorporating mismatch strain

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Rare Metals 2024年第7期43卷 3370-3382页

作者： Min Zhou Hong-Hui Wu Yuan Wu Hui Wang Xiong-Jun Liu Sui-He Jiang Xiao-Bin Zhang Zhao-Ping Lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083Cnina Institute for Carbon Neutrality University of Science and TechnologyBeijing 100083China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

Ab st ra ct Nanocrystalline materials exhibit unique properties due to their extremely high grain boundary(GB) ***,this high-density characteristic induces grain coarsening at elevated temperatures,thereby limiting the widespread application of nanocrystalline *** experimental observations revealed that GB segregation and second-phase pinning effectively hinder GB migration,thereby improving the stability of nanocry stalline *** this study,a mouified phase-field model that integrates mismatch strain,solute segregation and precipitation was developed to evaluate the influence of lattice misfit on the thermal stability of nanocrystalline *** simulation results indicated that introducing a suitable mismatch strain can effectively enhance the microstructural stability of nanocrystalline *** synergizing precipitation with an appropriate lattice misfit,the formation of second-phase particles in the bulk grains can be suppressed,thereby facilitating solute segregation/precipitation at the *** concentrated solute segregation and precipitation at the GBs effectively hinders grain migration,thereby preventing grain *** findings provide a new perspective on the design and regulation of nanocrystalline alloys with enhanced thermal stability.

关键词： Phase field model Mismatch strain Second-phase precipitation Grain boundary segregation Nanocrystalline alloys

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Semitransparent organic solar cells with high light utilization efficiency and color rendering index

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science China Chemistry 2024年第7期67卷 2248-2256页

作者： Ni Gao Haijun Bin Shangrong Wu RenéA.J.Janssen Yongfang Li Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor Materials and DevicesCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhou 215123China Molecular Materials and Nanosystems&Institute for Complex Molecular Systems Eindhoven University of TechnologyEindhoven 5600 MBthe Netherlands

Semitransparent organic solar cells(ST-OSCs)have garnered considerable attention as promising renewable energy technology for integrating photovoltaics into ***,there is a trade-off between power conversion efficiency(PCE)and average visible transmittance(AVT),which hinders the achievement of a high light utilization efficiency(LUE).In this study,we propose a valuable method to address this challenge by replacing the transparent top electrode,Ag,with a 20 nm layer of *** ST-OSCs based on the 20 nm Au electrode demonstrate superior exciton extraction,more efficient charge collection,and higher color-rendering index(CRI)due to their smoother surface,higher conductivity,and enhanced visible light transmittance,resulting in a significantly higher PCE of 13.67%and an enhanced AVT of 30.17%,contributing to a high LUE of 4.15%.Additionally,optically transparent dielectric layers,applied on the front and back sides of the ST-OSCs to further boost performance,delivered an impressive LUE of 4.93%,with PCE and AVT values reaching 14.44%and 34.12%,***,the champion ST-OSCs also exhibited a favorable CRI value of *** achievements represent the bestperforming ST-OSCs to date with both high LUE and CRI and hold significant implications for the prospective commercialization of ST-OSCs.

关键词： semitransparent organic solar cells power conversion efficiency average visible transmittance light utilization efficiency color-rendering index

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Design and characterization of a novel Cu_(2.3)Al_(1.3)Ni_(1.7)SnCr_(0.3) multi-principal element alloy coating on magnesium alloy by laser cladding

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Journal of materials science & Technology 2023年第21期152卷 220-236页

作者： Lipeng Jiang Xiufang Cui Guo Jin Zhimin Tian Xin Wen Haoliang Tian Erbao Liu Institute of Surface/Interface Science and Technology Key Laboratory of Superlight Material and Surface Technology of Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Beijing Beijing Institute of Aeronautical MaterialsBeijing 100095China Institute of Defense Engineering AMSPLABeijing 100850China

The evaporation and dilution of substrate seriously limit the performance of laser cladding coatings on magnesium *** order to overcome the above shortcomings,a multi-step ultrasonic assisted laser remelting technology was proposed to improve the performance of the *** this work,a novel Cu_(2.3)Al_(1.3)Ni_(1.7)SnCr_(0.3) multi-principal element alloy coating(MPEAC)was prepared on the surface of mag-nesium *** techniques such as transmission electron microscopy(TEM),electron back scatter diffraction(EBSD)and scanning electron microscopy(SEM)were employed to characterize the microstructure and phase composition of the *** the phase structure and morphology at the interface between the coating and the substrate were also studied via focus ion beam(FIB)and TEM *** addition,the corrosion and wear resistance ability of the coatings were monitored by potentiodynamic polarization(PDP),and electrochemical impedance spectroscopy(EIS),hardness and friction *** results show that Cu_(2.3)Al_(1.3)Ni_(1.7)SnCr_(0.3) MPEAC with ultrasonic assisted is composed of FCC phase and eutectic phases(Cu_(10)Sn_(3) and Cu_(2)Ni_(3)Sn_(3)).Due to the forced convection generated by ultrasonic waves,some Cu and Ni phases are precipitated around Cu_(2)Ni_(3)Sn_(3) phases,which is beneficial to enhance the corrosion *** of the grain refinement effect caused by ultrasonic,the wear resistance of the coating is also ***,ultrasonic vibration can effectively weaken and eliminate the texture density of the Cu_(2.3)Al_(1.3)Ni_(1.7)SnCr_(0.3) MPEAC fabricated by laser cladding.

关键词： Magnesium alloy Multi-principal element alloy coating Ultrasonic assisted laser cladding Corrosion resistance Wear resistance

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Novel titanium vanadate with superior Na^(+) transport kinetics for rapid charging and low-temperature sodium ion batteries

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Green Energy & Environment 2025年第2期10卷 374-381页

作者： Dan Lv Liehao Wei Cheng Wang Mingyue Wang Zhongchao Bai Yameng Fan Dongdong Wang Nana Wang Jian Yang Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education) School of Materials Science and EngineeringTianjin UniversityTianjin300072China Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShandong UniversityJinan250100China Tianjin Key Lab of Indoor Air Environmental Quality Control School of Environmental Science and TechnologyTianjin UniversityTianjin300072China Institute for Superconducting and Electronic Materials University of WollongongWollongongAustralia Institute of Energy Materials Science(IEMS) University of Shanghai for Science and Technology516 Jungong RoadShanghai200093China

Sodium-ion batteries(SIBs)hold great promise for large-scale energy storage in the post-lithium-ion battery era due to their high rate performance and long lifespan,although their sluggish Na^(+) transformation kinetics still require *** by the excellent electrochemical performance of titanium-based anode materials,here,we present a novel titanium vanadate@carbon(TVO@C)material as anode for *** TVO@C material is synthesized via a facile coprecipitation method,with the following annealing process in an acetylene *** opened ion channel and the oxygen vacancies within TVO@C facilitate the diffusion of Na^(+) ions,reducing their diffusion ***,an ultrahigh rate of 100 A g^(-1)and long life of 10,000 cycles have been ***,the TVO@C electrode exhibits stable performance,not only at room temperature,but also at temperatures as low as 20 *** TVO@CjjNa_(3)V_(2)(PO_(4))_(3)@C full cells have also achieved stable discharge/charge for 500 *** is believed that this strategy provides new insight into the development of advanced electrodes and provides a new opportunity for constructing novel high rate electrodes.

关键词： Anode High rate Titanium vanadate Sodium ion batteries

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Microstructure evolution of extruded Mg-RE-Ag alloy during short-time heat treatment

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Journal of Rare Earths 2024年第12期42卷 2350-2361,I0006页

作者： Zehua Li Jinghuai Zhang Shujuan Liu Jiaming Hao Liyuan Liu Yuying He Haodong Zhang Xingkai Jiao Xiaobo Zhang Ruizhi Wu Key Laboratory of Superlight Material and Surface Technology Ministry of EducationCollege of Material Science and Chemical EngineeringHarbin Engineering UniversityHarbin150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of TechnologyNanjing211167China

Microstructure regulation via short-time heat treatment is conducive to the optimization in the microstructure and properties of precipitable magnesium(Mg)alloys,but there is currently a lack of relevant *** this work,the microstructure evolution of a Mg-RE-Ag alloy during different short-time heat treatments was characterized and *** results show that extreme short-time heat treatment(ESHT,e.g.,2 min)at 450-480℃can greatly increase solute concentration in Mg matrix through the rapid re-dissolution of the second-phase and simultaneously maintain fine grains,while the ESHT at a too high temperature(e.g.,510℃)is not suitable due to excessive grain growth and coarse second phase regenerated at grain *** is found that 480℃is the approximate critical temperature for appropriate ESHT,and further prolongation of the time will lead to excessive grain *** is suggested that in addition to grain boundary migration,grain rotation is activated,resulting in the annihilation of high-angle grain boundaries with relatively low misorientation,as well as the reduction in the ability of the residual second phase to pin grain *** addition,the reasons for the abnormal grain boundary segregation and grain boundary continuous phase were analyzed from the perspective of interfacial *** study provides a basis for effective microstructure regulation of Mg-RE alloys.

关键词： Magnesium alloy Rare earths Microstructure Heat treatment Precipitates

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Photoexcitation-induced passivation of SnO2 thin film for efficient perovskite solar cells

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National science Review 2023年第11期10卷 183-191页

作者： Nianyao Chai Xiangyu Chen Zhongle Zeng Ruohan Yu Yunfan Yue Bo Mai Jinsong Wu Liqiang Mai Yi-Bing Cheng Xuewen Wang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of Technology National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu Laboratory

A high-quality tin oxide electron transport layer(ETL) is a key common factor to achieve high-performance perovskite solar cells(PSCs). However, the conventional annealing technique to prepare high-quality ETLs by continuous heating under near-equilibrium conditions requires high temperatures and a long fabrication time. Alternatively, we present a non-equilibrium, photoexcitation-induced passivation technique that uses multiple ultrashort laser pulses. The ultrafast photoexcitation and following electron–electron and electron–phonon scattering processes induce ultrafast annealing to efficiently passivate surface and bulk defects, and improve the crystallinity of Sn O2, resulting in suppressing the carrier recombination and facilitating the charge transport between the ETL and perovskite interface. By rapidly scanning the laser beam, the annealing time is reduced to several minutes, which is much more efficient compared with conventional thermal annealing. To demonstrate the university and scalability of this technique, typical antisolvent and antisolvent-free processed hybrid organic–inorganic metal halide PSCs have been fabricated and achieved the power conversion efficiency(PCE) of 24.14% and 22.75% respectively, and a12-square-centimeter module antisolvent-free processed perovskite solar module achieves a PCE of 20.26%,with significantly enhanced performance both in PCE and stability. This study establishes a new approach towards the commercialization of efficient low-temperature manufacturing of PSCs.

关键词： photoexcitation-induced passivation ultrafast laser carrier management electron transport layer perovskite solar cells

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