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Tungsten 2021年第4期3卷 406-414页

作者： ya-guang dong Shang Chen Nan-Nan Jia Qiu-Hong Zhang Liang Wang Yun-Fei Xue Ke Jin School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 10081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

The refractory high entropy alloys(RHEAs)containing disordered body-centered cubic(BCC)and ordered BCC(B2)structures often exhibit high strength but low ductility at room temperature,even in the compressive *** this study,(Ta_(25-x)Nb_(25)Zr_(25)Ti_(25+x))95Al_(5)(x=0,5,10)RHEAs are fabricated to investigate the compositional dependence of the microstructures and mechanical *** the three alloys exhibit a single BCC structure at the as-cast and solution-treated states,while the basket weave-like microstructures consisting of cuboidal and strip-like phases are formed after aging at 600°*** microstructure of the aged alloys is sensitive to the compositions:only disordered BCC1+BCC2 dual phases are observed in the(Ta_(25)Nb_(25)Zr_(25)Ti_(25))_(95)Al_(5)alloy;additional B2 phases are formed by replacing 5 at%Ta with Ti;a complex microstructure containing BCC1+BCC2+B2+Omega phases are identified in the(Ta_(15)Nb_(25)Zr_(25)Ti_(35))_(95)Al_(5)*** replacing Ta with Ti results in a reduction of compressive yield strength from 1762 to 1243 MPa,the fracture strain is greatly enhanced from 7.3 to 44.3%,indicating that the strength-ductility balance can be tuned to a large extent in this RHEA system.

关键词： Refractory high entropy alloys Microstructure Mechanical properties Strength-ductility balance

Effects of Nb Addition on Charpy Impact Properties of TiVTa Refractory High‑Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2023年第3期36卷 405-416页

作者： Xue Yin yan‑Kun Dou Xin‑Fu He Ke Jin Cheng‑Long Wang ya‑guang dong Cun‑Yong Wang Yun‑Fei Xue Wen yang Department of Reactor Engineering Technology Research China Institute of Atomic EnergyBeijing 102413China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advance Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

In the present study,the effects of Nb addition on Charpy impact properties of TiVTa refractory high-entropy alloy with high strength-ductility trade-off were systematically studied by using the instrumented Charpy impact testing *** experimental results showed that the impact toughness was remarkably improved by Nb addition in TiVTa to form TiVTaNb *** crack initiation energy and propagation energy of TiVTaNb were 67.3%and 24.9%higher than that of TiVTa,indicating that Nb addition simultaneously reinforced the resistance to crack initiation and *** impact fracture of TiVTaNb exhibited larger bending degree of shear lips,deeper dimples and more secondary cracks which effectively dissipated more impact *** deformation mechanism of TiVTa alloy was dominated by dislocation *** in TiVTaNb,the deformation mechanism was synergized by dislocation activities and deformation twinning,which were the main contributors for the improved impact properties and the stronger crack resistance of TiVTaNb alloy under impact loading.

关键词： Refractory high-entropy alloys Nb addition Impact property Crack resistance Deformation mechanism

Enhanced solid-electrolyte interface efficiency for practically viable hydrogen-air fuel cell systems

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Journal of Energy Chemistry 2025年第1期100卷 356-368页

作者： Venkitesan Sakthivel dong Jin Yoo Graduate School Department of Energy Storage/Conversion Engineering (BK21 FOUR) Hydrogen and Fuel Cell Research Center Jeonbuk National University Jeonju Department of Life Science Jeonbuk National University

Proton exchange membrane fuel cells （PEMFCs） provide an appealing sustainable energy system,with the solid-electrolyte membrane playing a crucial role in its overall ***,sulfonated poly（1,4-phenylene ether-ether sulfone）(SPEES),an aromatic hydrocarbon polymer,has garnered considerable attention as an alternative to Nafion ***,the long-term durability and stability of SPEES present a significant *** this context,we introduce a potential solution in the form of an additive,specifically a core–shell-based amine-functionalized iron titanate （A–Fe2TiO5）,which holds promise for improving the lifetime,proton conductivity,and power density of SPEES in *** modified SPEES/A–Fe2TiO5composite membranes exhibited notable characteristics,including high water uptake,enhanced thermomechanical stability,and oxidative ***,the SPEES membrane loaded with 1.2 wt%of A–Fe2TiO5demonstrates a maximum proton conductivity of 155 mS cm-1,a twofold increase compared to the SPEES membrane,at 80°C under 100%relative humidity （RH）.Furthermore,the 1.2 wt%of A–Fe2TiO5/SPEES composite membranes exhibited a maximum power density of 397.37 mW cm-2and a current density of 1148 mA cm-2at 60°C under 100%RH,with an opencircuit voltage decay of 0.05 m V/h during 103 h of continuous *** study offers significant insights into the development and understanding of innovative SPEES nanocomposite membranes for PEMFC applications.

关键词： Acid-base Hybrid membrane Proton conductivity Polymer electrolyte fuel cell Single-cell performance

Low-temperature chlorination roasting technology for the simultaneous recovery of valuable metals from spent LiCoO_(2)cathode material

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 80-91页

作者： Junjie Shi Changle Hou Jingjing dong dong Chen Jianzhong Li Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China

With the continuous increase in the disposal volume of spent lithium-ion batteries(LIBs),properly recycling spent LIBs has become essential for the advancement of the circular *** study presents a systematic analysis of the chlorination roasting kinetics and proposes a new two-step chlorination roasting process that integrates thermodynamics for the recycling of LIB cathode *** activation energy for the chloride reaction was 88.41 kJ/mol according to thermogravimetric analysis–derivative thermogravimetry data obtained by using model-free,model-fitting,and Z(α)function(αis conversion rate).Results indicated that the reaction was dominated by the first-order(F1)model when the conversion rate was less than or equal to 0.5 and shifted to the second-order(F2)model when the conversion rate exceeded *** conditions were determined by thoroughly investigating the effects of roasting temperature,roasting time,and the mass ratio of NH_(4)Cl to LiCoO_(2).Under the optimal conditions,namely 400℃,20 min,and NH_(4)Cl/LiCoO_(2)mass ratio of 3:1,the leaching efficiency of Li and Co reached 99.43% and 99.05%,*** of the roasted products revealed that valuable metals in LiCoO_(2)transformed into CoCl_(2) and ***,the reaction mechanism was elucidated,providing insights for the establishment of a novel low-temperature chlorination roasting technology based on a crystal structure *** technology can guide the development of LIB recycling processes with low energy consumption,low secondary pollution,high recovery efficiency,and high added value.

关键词： spent lithium-ion battery thermodynamics chlorination roasting kinetics circular economy

Research on the nanometric machining of a single crystal nickel via molecular dynamics simulation

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Science China(Technological Sciences) 2016年第12期59卷 1837-1846页

作者： GONG ya dong ZHU Zong Xiao ZHOU Yun guang SUN yao School of Mechanical Engineering & Automation Northeastern University

Molecular dynamics simulations are employed to study the nanometric machining process of single crystal nickel. Atoms from different machining zones had different atomic crystal structures owing to the differences in the actions of the cutting tool. The stacking fault tetrahedral was formed by a series of dislocation reactions, and it maintained the stable structure after the dislocation reactions. In addition, evidence of crystal transition and recovery was found by analyzing the number variations in different types of atoms in the primary shear zone, amorphous region, and crystalline region. The effects of machining speed on the cutting force, chip and subsurface defects, and temperature of the contact zone between the tool and workpiece were investigated. The results suggest that higher the machining speed, larger is the cutting force. The degree of amorphousness of chip atoms and the depth and extent of subsurface defects increase with the machining speed. The average friction coefficient first decreases and then increases with the machining speed because of the temperature difference between the chip and machining surface.

关键词： molecular dynamics simulation nanometric machining single crystal nickel crystal transition and recovery machining speed

Coalescence Suppression in Flowing Polymer Blends Using Silica Rods with Different Surface Chemistries

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Chinese Journal of Polymer Science 2021年第4期39卷 474-483,I0007页

作者： Si-Ying Xiang Li-Sa-ya Ye ya-Jiang Huang ya-dong Lv Mi-Qiu Kong guang-Xian Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering of ChinaSichuan UniversityChengdu 610065China

Silica rods with homogeneous(hydrophilic or hydrophobic)and amphiphilic surface properties were synthesized and their efficiencies in suppressing the flow-induced droplet coalescence of immiscible polyisobutylene(PIB)/polydimethylsiloxane(PDMS)blends were evaluated via in situ visualization *** flow-induced coalescence behavior of blends was found to strongly depend on the surface nature and concentration of silica rods added as well as the blend *** a trace amount of rods promoted coalescence,all kinds of rods demonstrated a morphology refinement effect at high rod *** compatibilization effects were obtained at high rod concentrations,especially for hydrophilic and amphiphilic *** on confocal laser scanning microscopy results,these phenomena observed were interpreted reasonably in terms of the selective distribution and aggregation of silica rods,which were suggested to be decisive for the stabilization mechanism and efficiency of these rods.

关键词： Immiscible polymer blends Flow Morphology Silica rods Surface chemistry

低蛋白质补充氨基酸日粮对哺乳母猪繁殖性能、背膘厚和乳成分的影响

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中国畜牧兽医 2016年第11期43卷 2945-2950页

作者：崔家军张鹤亮张兆琴李亚奎李广东赵秀成河北北方学院动物科技学院张家口075000 河北省畜牧站石家庄050000 河北省涿鹿县畜牧水产管理办公室张家口075600

研究旨在探讨低蛋白质补充氨基酸日粮对哺乳母猪繁殖性能、背膘厚和乳成分的影响。选择35头胎次、体重和体况相近的哺乳母猪,采用单因子试验设计,随机分为3个处理,每处理分别为13、11、11头母猪。对照组使用常规日粮,粗蛋白质水平为17.... 详细信息

研究旨在探讨低蛋白质补充氨基酸日粮对哺乳母猪繁殖性能、背膘厚和乳成分的影响。选择35头胎次、体重和体况相近的哺乳母猪,采用单因子试验设计,随机分为3个处理,每处理分别为13、11、11头母猪。对照组使用常规日粮,粗蛋白质水平为17.7%,试验Ⅰ、Ⅱ组分别使用低蛋白质补充氨基酸日粮,粗蛋白质水平为15.7%、13.7%,其氨基酸水平与对照组相近,哺乳期21d。结果表明:1与对照组相比,试验Ⅰ、Ⅱ组21日龄断奶全窝重、哺乳期母猪采食量、仔猪窝采食量及成活率均无显著差异(P>0.05),随着日粮蛋白质水平的降低母猪的失重有所增加,但各处理间差异不显著(P>0.05);2随着日粮蛋白质水平的降低,母猪背膘损失比例减少,但各处理间差异不显著(P>0.05);3与对照组相比,试验Ⅱ组的乳品质较好,但无显著差异(P>0.05)。以上结果说明,通过补充氨基酸降低哺乳母猪日粮粗蛋白质水平(由17.7%降至15.7%、13.7%),不会影响母猪及仔猪的生产性能,是节约蛋白质资源的有效措施。

关键词：哺乳母猪低蛋白质日粮氨基酸繁殖性能乳成分

High-temperature Thermo-oxidative Aging of Vulcanized Natural Rubber Nanocomposites:Evolution of Microstructure and Mechanical Properties

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Chinese Journal of Polymer Science 2023年第8期41卷 1287-1297,I0010页

作者： Zhou-Xian Li Yi-Ran Kong Xiang-Fei Chen ya-Jiang Huang ya-dong Lv guang-Xian Li College of polymer science and engineering State key laboratory of polymer materials engineering of ChinaSichuan UniversityChengdu 610065China

The aging of natural rubber(NR)at high temperatures will seriously affect its service lifetime in many key *** the present work,the changes in microstructure and mechanical properties of semi-efficient vulcanized NR/carbon black(CB)vulcanizates during thermooxidative aging at high temperatures(150-200℃)and a moderate temperature(95℃)were *** high temperatures,a two-stage aging behavior,which was characteristic of a first rapid decline and then a continuous rise in the crosslinking density(ve),was identified and was found to be closely related to the depletion behavior of *** surface cracking behavior observed in the second stage of high-temperature aging was discussed in terms of the grafting reaction of macromolecular radicals on CB particles and thermal *** contrast,the aging of NR at moderate temperatures was much mild,which featured a continuous increase in ve and an oxidation mechanism dominated by peroxy radicals attacking double *** general,the mechanical properties of NR vulcanizates during high-temperature aging depended on the competition effects of structural evolution in the crosslinked network and oxidation-induced chain scission.

关键词： Natural rubber nanocomposites High-temperature Thermo-oxidative aging

An Artificial Intelligence-Assisted Flexible and Wearable Mechanoluminescent Strain Sensor System

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NANO-MICRO LETTERS 2025年第1期17卷 1-15页

作者： dong, yan An, Wenzheng Wang, Zihu Zhang, dongzhi China Univ Petr East China Coll Control Sci & Engn Qingdao 266580 Peoples R China

The sandwich-structured flexible mechanoluminescent sensor (SFLC) film shows great application potential as wireless wearable strain sensor and encryption ***-level integration of SFLC film with deep learning-based artificial intelligence enables fast and accurate interpretation of color data to strain values with automatic correction of errors caused by varying color *** smart glove wearable sensor based on the SFLC film combined with deep learning neural network enables fast and accurate hand gesture recognition. The complex wiring, bulky data collection devices, and difficulty in fast and on-site data interpretation significantly limit the practical application of flexible strain sensors as wearable devices. To tackle these challenges, this work develops an artificial intelligence-assisted, wireless, flexible, and wearable mechanoluminescent strain sensor system (AIFWMLS) by integration of deep learning neural network-based color data processing system (CDPS) with a sandwich-structured flexible mechanoluminescent sensor (SFLC) film. The SFLC film shows remarkable and robust mechanoluminescent performance with a simple structure for easy fabrication. The CDPS system can rapidly and accurately extract and interpret the color of the SFLC film to strain values with auto-correction of errors caused by the varying color temperature, which significantly improves the accuracy of the predicted strain. A smart glove mechanoluminescent sensor system demonstrates the great potential of the AIFWMLS system in human gesture recognition. Moreover, the versatile SFLC film can also serve as a encryption device. The integration of deep learning neural network-based artificial intelligence and SFLC film provides a promising strategy to break the "color to strain value" bottleneck that hinders the practical application of flexible colorimetric strain sensors, which could promote the development of wearable and flexible strain sensors from laboratory research to

关键词： Mechanoluminescent Strain sensor Flexible Deep learning Wireless

Purification efficiency of ecological spur dikes for river pollutants in different geometric arrangements:Experiments and numerical modeling

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Journal of Hydrodynamics 2022年第5期34卷 934-947页

作者： Yi-tian Chen Xiao-ling Wang Song-min Li ya-zhi Zheng guang-yao dong College of Environmental Science and Engineering Tianjin UniversityTianji300350China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin300072China College of Hydraulic Engineering Tianjin Agricultural CollegeTianjin300392China

The traditional ecological spur dike is improved,by using the biological fillers such as the plant materials,combined with microorganisms,to obtain a larger water purification *** of the researches on spur dikes focused on the hydrodynamic force and the migration and the diffusion of the pollutants,but not so much on the effects of the spur dike materials and the arrangement parameters on the water purification *** this paper the biological zeolite is used to make ecological spur *** laboratory flume experiment shows that compared with the natural zeolite spur dike,the purification effect of the biological zeolite spur dike is significantly improved,and the average removal rate of the NH3-N is kept at 6.8%after 24 h compared with 3.5%of the natural zeolite spur *** NH3-N removal rates of a single spur dike,the counterpart spur dikes and the staggered spur dikes decrease with the increase of the inlet flow,and the staggered spur dikes have the best purification ***,a numerical model based on the MIKE21 is verified by the experimental results and applied for the Tangjiali Section of the Xutangqiao River in Xinwu District,Wuxi City,Jiangsu *** orthogonal test shows that the length of the spur dike has the most important effect on the interception of pollutants and the purification,followed by the angle of the spur dike and the spacing of the spur dikes has the least important *** geometric arrangement parameters of the ecological spur dike group with the highest efficiency on the pollutant interception and the purification are:60°(angle),6.7 m(length)and 20 m(spacing).

关键词： Ecological spur dike spur dike group numerical simulation biological zeolite interception purification geometric arrangement parameters