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Nanostructuring of Zn–Li-based alloys through severe plastic deformation: Microstructure, mechanical properties, and corrosion behaviors

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Nano Materials Science 2024年

作者： Huang, He Fang, Liudang Tong, Zhipei Gong, Gencheng Yu, Hui Kulyasova, Olga Valiev, Ruslan Z. Xia, Dandan Zheng, Yufeng Bian, Dong School of Materials Science and Engineering Zhengzhou University Zhengzhou450003 China Southern Medical University Guangzhou510080 China School of Medicine South China University of Technology Guangzhou510006 China Guangzhou Key Laboratory of Spine Disease Prevention and Treatment Department of Orthopaedic Surgery The Third Affiliated Hospital of Guangzhou Medical University Guangzhou510515 China Institute of Physics of Advanced Materials Ufa State Aviation Technical University Ufa450008 Russia Department of Dental Materials Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology & NHC Key Laboratory of Digital Stomatology & NMPA Key Laboratory for Dental Materials Beijing100081 China School of Materials Science and Engineering Peking University Beijing100871 China International Research Organization for Advanced Science and Technology Kumamoto University Kumamoto 860-8555 Japan

To date, nanostructuring through plastic deformation has rarely been reported in biodegradable zinc (Zn) based alloys that have great potential in load-bearing conditions. Here, typical high-strength Zn–Li-based alloys were subjected to SPD processes, including equal channel angular pressing (ECAP) and high-pressure torsion (HPT), to achieve nanostructured microstructures. The effects of SPD on the microstructures, mechanical properties, and corrosion behaviors were generally investigated. The two SPD routes resulted in totally different microstructures. ECAPed samples processed at 150 °C exhibited a complicated multilevel structure (nm to μm) with mixed Zn equiaxed grains and lamellar-like eutectoid regions (Zn + α-LiZn4), and HPTed ones (25 °C) possessed a fully dynamically recrystallized (DRXed) microstructure with an average grain size below 0.4 μm. The tensile strength of the SPD samples could reach 500 MPa. Meanwhile, HPTed samples exhibited extraordinary fracture elongations higher than 100 %, because of a different grain boundary sliding deformation mechanism. HPTed samples and ECAPed samples displayed different corrosion patterns, and the former exhibited a much higher corrosion rate in Hank's solution, possibly due to the accelerated corrosion at grain boundaries. In summary, SPD is an efficient way to refine the microstructure of biodegradable Zn-based alloys, possibly improving their performances and clinical applications. © 2024 Chongqing University

关键词： Equal channel angular pressing

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Interpretable machine-learning strategy for soft-magnetic property and thermal stability in Fe-based metallic glasses

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npj Computational Materials 2020年第1期6卷 1-9页

作者： Lu, Zhichao Chen, Xin Liu, Xiongjun Lin, Deye Wu, Yuan Zhang, Yibo Wang, Hui Jiang, Suihe Li, Hongxiang Wang, Xianzhen Lu, Zhaoping Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China Institute of Applied Physics and Computational Mathematics Beijing100088 China Software Center for High Performance Numerical Simulation Chinese Academy of Engineering Physics Beijing100088 China Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China

Fe-based metallic glasses (MGs) have been extensively investigated due to their unique properties, especially the outstanding soft-magnetic properties. However, conventional design of soft-magnetic Fe-based MGs is heavily relied on "trial and error" experiments, and thus difficult to balance the saturation flux density (Bs) and thermal stability due to the strong interplay between the glass formation and magnetic interaction. Herein, we report an eXtreme Gradient Boosting (XGBoost) machine-learning (ML) model for developing advanced Fe-based MGs with a decent combination of Bs and thermal stability. While it is an attempt to apply ML for exploring soft-magnetic property and thermal stability, the developed XGBoost model based on the intrinsic elemental properties (i.e., atomic size and electronegativity) can well predict Bs and Tx (the onset crystallization temperature) with an accuracy of 93.0% and 94.3%, respectively. More importantly, we derived the key features that primarily dictate Bs and Tx of Fe-based MGs from the ML model, which enables the revelation of the physical origins underlying the high Bs and thermal stability. As a proof of concept, several Fe-based MGs with high Tx (>800 K) and high Bs (>1.4 T) were successfully developed in terms of the ML model. This work demonstrates that the XGBoost ML approach is interpretable and feasible in the extraction of decisive parameters for properties of Fe-based magnetic MGs, which might allow us to efficiently design high-performance glassy materials. © 2020, The Author(s).

关键词： Thermodynamic stability

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Polynorepinephrine-Regulated Filler Sulfonation Toward Interfacial Reformation And Conductive Promotion Of Nanocomposite Proton Exchange Membrane

SSRN

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SSRN 2023年

作者： Huang, Tong Liu, Xin Ma, Ruibin Gao, Yangyang Xu, Xiaomin Yan, Chengrun Guo, Yuchen Li, Xiaoxu Sharma, Kamlesh Liu, Lingling Xue, Jiandang Huang, Huadong Zhang, Xiyuan Yin, Xiaochun Zhai, Shaoxiong Chen, Jiechao Jia, Xiaoyang He, Shaojian Lin, Jun Zhang, Liqun Qin, Yanzhou State Key Laboratory of Engines School of Mechanical Engineering Tianjin University Tianjin300072 China Sichuan Diwei Energy Technology Co. Ltd. Mianyang621000 China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Nanjing211816 China Chengdu Vehicle Environmental Protection Technology Co. Ltd. Chengdu610093 China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing100029 China State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou310007 China State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu610065 China Graduate School of Frontier Sciences The University of Tokyo Chiba277-8561 Japan Guangdong Provincial Key Laboratory of Fuel Cell Technology South China University of Technology Guangzhou510640 China Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing South China University of Technology Guangzhou510640 China Beijing Institute of Smart Energy Beijing101499 China Key Laboratory of Advanced Materials of Ministry of Education Tsinghua University Beijing100084 China Chongqing Key Laboratory of Green Aviation Energy and Power Chongqing Jiaotong University Chongqing401120 China Guangdong Provincial Key Laboratory of Distributed Energy Systems Dongguan University of Technology Dongguan523808 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China Kharagpur India

Interfacial compatibility between filler and matrix substantially affects the overall morphology and performance of nanocomposites. Compared with bare montmorillonite (MMT), surface modified product such as sulfonated MMT (SMMT) has been known to render optimized interfacial compatibility in composite proton exchange membranes (PEMs) for proton exchange membrane fuel cells (PEMFCs) and direct methanol fuel cells (DMFCs). Nevertheless, in-depth understanding and investigation on the sulfonation of MMT are seldom focused, such as uniformity and sufficiency. Herein, these broadly neglected issues are proposed and resolved using an exemplary polynorepinephrine (PNE)-regulated SMMT (SNMMT). Rather than direct sulfonation utilizing the inherent hydroxyl groups of MMT, a PNE coating with ample hydroxyl groups is deposited on MMT beforehand, which results in more homogeneous and sufficient sulfonation of SNMMT. Compared with normal SMMT, this alteration on surficial geography of filler functionalization brings significant benefits when composited with Nafion matrix, including harmonized filler-matrix compatibility, improved mechanical stability and enhanced proton conduction. Moreover, the antioxidative ability of PNE layer enables improved chemical stability of nanocomposite PEM. The Nafion/SNMMT composite PEM achieves 0.275 S cm-1 proton conductivity at 95 ºC in water, evidently beyond any previously reported composite PEMs using normal SMMT. Equipped with this reformed nanocomposite PEM, both PEMFC and DMFC display competitive peak power densities (1.121 W cm-2 with H2/O2 at 80 ºC/100% relative humidity (RH) for PEMFC, and 0.228 W cm-2 with 1.6 M methanol/100% RH O2 for DMFC), and simultaneously show minor performance deteriorations in constant current density operation and RH cycle tests. It would be instructive the specific focus and reformation on the uniformity and sufficiency of filler modification may render significant interface and performance advancements for na

关键词： Nanocomposites

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Effect of compound surface modification of shot peening and DLC coating on surface integrity and fatigue properties of gear steel 16Cr3NiWMoVNbE

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Heliyon 2024年第18期10卷 e37991页

作者： Yu, Bo Xu, Chunling Gao, Kaixiong Yang, Wenming Wang, Xin Sun, Zhongwu Zhang, Bin Tang, Zhihui Surface Engineering Institution AECC Beijing Institute of Aeronautical Materials Beijing 100095 China Aviation Key Laboratory of Advanced Corrosion and Protection on Aviation Materials AECC Beijing Institute of Aeronautical Materials Beijing 100095 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou China School of Mechanical Engineering University of Science and Technology Beijing 100083 China School of Material Science and Engineering Nanchang Hangkong University Nanchang 330063 China Process Technology Center AECC Harbin Dongan Aero-engine Co. Ltd Harbin 150066 China

We conducted a study on the surface compound modification of shot peening and pure carbon DLC coating to simultaneously meet the requirements of wear resistance and fatigue resistance of spline structure. The effects of surface compound modification were investigated on the surface morphology, residual stress profile, microstructure, and nano-indentation hardness of 16Cr3NiWMovNbE gear steel, and conducted a comparative study on fatigue performance. The results show that the surface compound modification inherits the surface morphology and compressive residual stress gradient of shot peening, while the surface residual stress is slightly smaller than that of shot peening. In addition, surface compound modification still reflects the characteristics of high hardness and high fracture resistance of DLC coatings. Under the bending load based on spline tooth root, compared to the original specimen, the fatigue life after shot peening, pure carbon DLC coating, and surface compound modification is increased by 3.68, 2.35, and 3.36 respectively. Although the compound modified surface still maintains the shot peening morphology with a increasing surface roughness and stress concentration coefficient, the 100 μm-depth compressive residual stress profile and the subgrain refinement layer introduced, as well as the hard surface layer with good load-bearing capacity, have played the role of fatigue strengthening. © 2024

关键词： DLC gradient coating Fatigue hot peening Surface integrity

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Research on the Potential of Urban Green-Blue Infrastructure in Carbon Reduction Benefits

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景观设计学(中英文) 2025年第2期13卷 12-25页

作者： Yunsheng BAI Gengyuan LIU Mingwan WU Zhaoman HUO Ningyu YAN Fanxin MENG Qing YANG Zhongming LU Silvio CRISTIANO State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing100875China Beijing Engineering Research Center for Watershed Environmental Restoration and Integrated Ecological Regulation Beijing 100875China Guangdong Basic Research Center of Excellence for Ecological Security and Green Development Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of EducationSchool of EcologyEnvironment and ResourcesGuangdong University of TechnologyGuangzhou 510006China Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal UniversityZhuhai 519087China Division of Environment and Sustainability Hong Kong University of Science and TechnologyHong Kong 999077China Department of Architecture University of FlorenceFlorence 50121Italy

Urban green-blue infrastructures(GBls)are increasingly gaining attention in the pursuit of carbon neutrality,particularly within residential *** this background,this study established an integrated quantitative framework to assess both direct and indirect carbon reduction benefits of urban GBls,by leveraging Life Cycle Assessment approach to precisely calibrate the carbon sequestration benefits of three typical urban GBls(green roofs,sunken green spaces,and rain gardens)under three different scenarios and building a carbon sequestration database that includes 36 local plant species in *** research results indicate that GBls have a reducing effect on carbon emissions in urban residential *** extrapolating the simulation results to the city scale,the preliminary estimation suggests that the construction of GBls within residential areas in Shanghai can achieve a carbon sink of approximately 540.54 million tCOzeq per *** level of carbon sequestration is equivalent to 32%of Shanghai's annual carbon *** is evident that the construction of GBls possesses significant potential in carbon reduction benefits and for achieving urban carbon neutrality strategies.

关键词： Green-Blue Infrastructure Life Cycle Assessment Planting Design Green-Blue Infrastructure Design Carbon Reduction Benefit Carbon Sequestration Residential Area

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Modeling and simulation of Valve Cycle in Vein Using an Immersed Finite Element Method

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Computer Modeling in Engineering & Sciences 2020年第4期123卷 153-183页

作者： Xiang Liu Liangbo Sun Mingzhen Wang Bin Li Lisheng Liu Department of Engineering Structure and Mechanics Wuhan University of TechnologyWuhan430070China College of Mechanical Engineering Wuhan Polytechnic UniversityWuhan430048China China Special Vehicle Research Institute Aviation Key Scientific and Technological Laboratory of High Speed HydrodynamicJingmen448035China Nanjing University of Aeronautics and Astronautics Nanjing210016China State Key Laboratory of Advanced Technology of Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China.

A vein model was established to simulate the periodic characteristics of blood flow and valve deformation in blood-induced valve *** an immersed finite element method which was modified by a ghost fluid technique,the interaction between the vein and blood was *** an independent solid solver,the contact force between vein tissues was calculated using an adhesive contact method.A benchmark simulation of the normal valve cycle validated the proposed model for a healthy *** the opening orifice and blood flow rate agreed with those in the *** blood shear stress and maximum leaflet stress were also seen in the base region of the *** the basis of the healthy model,a diseased vein model was subsequently built to explore the sinus lesions,namely,fibrosis and atrophy which are assumed stiffening and softening of the *** results showed the opening orifice of the diseased vein was inversely proportional to the corresponding modulus of the sinus.A drop in the transvalvular pressure gradient resulted from the sinus *** to the fibrosis,the atrophy of the sinus apparently improved the vein deformability but simultaneously accelerated the deterioration of venous disease and increased the risk of potential *** results provide understandings of the normal/abnormal valve cycle in vein,and can be also helpful for the prosthesis design.

关键词： Numerical simulation fluid-structure interaction immersed finite element method adhesive contact method bio-mechanics venous valve.

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Ceramic particles reinforced copper matrix composites manufactured by advanced powder metallurgy:preparation, performance, and mechanisms

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International Journal of Extreme Manufacturing 2023年第3期5卷 200-234页

作者： Yi-Fan Yan Shu-Qing Kou Hong-Yu Yang Shi-Li Shu Feng Qiu Qi-Chuan Jiang Lai-Chang Zhang State Key Laboratory of Automotive Simulation and Control Jilin UniversityRenmin StreetNo.5988ChangchunJilin Province 130025People’s Republic of China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and EngineeringJilin UniversityRenminStreetNo.5988ChangchunJilin Province 130025People’s Republic of China School of Materials Science and Engineering Jiangsu University of Science and TechnologyJilin Province 130025People’s Republic of China School of Mechanical and Aerospace Engineering Jilin University270 Joondalup DriveJoondalupPerthWestern Australia 6027Australia Centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan UniversityZhenjiang 212003People’s Republic of China

Copper matrix composites doped with ceramic particles are known to effectively enhance the mechanical properties,thermal expansion behavior and high-temperature stability of copper while maintaining high thermal and electrical *** greatly expands the applications of copper as a functional material in thermal and conductive components,including electronic packaging materials and heat sinks,brushes,integrated circuit lead *** far,endeavors have been focusing on how to choose suitable ceramic components and fully exert strengthening effect of ceramic particles in the copper *** article reviews and analyzes the effects of preparation techniques and the characteristics of ceramic particles,including ceramic particle content,size,morphology and interfacial bonding,on the diathermancy,electrical conductivity and mechanical behavior of copper matrix *** corresponding models and influencing mechanisms are also elaborated in *** review contributes to a deep understanding of the strengthening mechanisms and microstructural regulation of ceramic particle reinforced copper matrix *** more precise design and manipulation of composite microstructure,the comprehensive properties could be further improved to meet the growing demands of copper matrix composites in a wide range of application fields.

关键词： copper matrix composites advanced powder metallurgy model prediction particle characteristics strengthening mechanism

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Experimental study of rotor blades vibration and noise in multistage high pressure compressor and their relevance

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Chinese Journal of Aeronautics 2020年第3期33卷 870-878页

作者： Fengtong ZHAO Xiaodong JING Mingsui YANG Deyou WANG Yundong SHA Xiaochi LUAN School of Energy and Power Engineering Beihang UniversityBeijing 100191China Liaoning Province Key Laboratory of Advanced Measurement And Test Technology of Aviation Propulsion Systems Shenyang Aerospace UniversityShenyang 110136China Shenyang Engine Design and Research Institute Aero Engine(Group)Corporation of ChinaShenyang 110015China

Rotor blades fault of aeroengine compressor is mostly caused by mechanical and aerodynamic *** the excitation factor of high intensity sound wave to rotor blades should not be *** researches are conducted on a multistage high pressure *** high level vibration occurs on the first stage of rotor blades, the noise spectrum presents typical characteristic for discrete multi-tone in the *** amplitude of blade vibration displacement and the sound pressure level of characteristic frequency noise increases and decreases simultaneously and reaches the maximum value at the same *** frequency merely occur on a certain speed range and is locked in a specific range which presents no variation with the rotating *** high level vibration occurs on the first stage of rotor blades, the noise spectrum presents a sharp peak and the propagation state of the characteristic frequency is a helix structure in the *** can be confirmed that acoustic resonance occurs in the multistage *** acoustic resonance frequency and its side band frequencies are generated by modulation of a rotating noise source at the rotor speed which is the excitation source of the rotor blades vibration.

关键词： Acoustic resonance Blades vibration Characteristic frequency Multistage compressor Source identification

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Bidirectional Flow on Stairs at Different Flow Ratios 13th

Bidirectional Flow on Stairs at Different Flow Ratios

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13th Conference on Traffic and Granular Flow, TGF 2019

作者： Ye, Rui Zhang, Jun Chraibi, Mohcine Song, Weiguo State Key Laboratory of Fire Science University of Science and Technology of China Hefei230027 China Institute for Advanced Simulation Forschungszentrum Jülich Jülich52425 Germany

ISBN: (纸本)9783030559724

Bidirectional flow happens not only on horizontal planes, but also on stairs. So far, bidirectional horizontal movements have been investigated through various field studies and controlled experiments, but such movements on stairs are rarely paid attention to, especially those based on trajectories. In this paper we investigate bidirectional flow on stairs at different flow ratios ranging from 0.1 to 0.9. Preliminary results such as lane formation, crossing time and fundamental diagrams in three movement scenarios are presented, and the characteristics of the descending and ascending pedestrians are compared. Our results can be applied for the validation and calibration of simulation models on stairs. © 2020, Springer Nature Switzerland AG.

关键词： Stairs

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Unraveling the Influence of Precipitation and Temperature Variability on Anthropogenic Nutrient Inputs in a River Basin: Implications for Environmental Management

SSRN

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SSRN 2024年

作者： Zhang, Shuhui Li, Xia Ren, Ze Zhang, Cheng Fang, Le Mo, Xiaobiao Yang, Wei Liu, Xinhui Advanced Institute of Natural Sciences Beijing Normal University Zhuhai519087 China State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing100875 China Key Laboratory of Coastal Water Environmental Management and Water Ecological Restoration of Guang-dong Higher Education Institutes Beijing Normal University Zhuhai519087 China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing210008 China Instrumentation and Service Center for Science and Technology Beijing Normal University Zhuhai519087 China Faculty of Arts and Sciences Beijing Normal University Zhuhai China

Since the Industrial Revolution, anthropogenic activities have substantially increased the input of nitrogen (N) and phosphorus (P) into river basins, complexity by interplay with climate. This study analyzed the characteristics of N and P inputs within the Dawen River Basin from 2000 to 2021 using the Net Anthropogenic Nitrogen Input (NANI) and Net Anthropogenic Phosphorus Input (NAPI) methods, and explored how those variables respond to precipitation and temperature variability. We found a generally decreasing trend in NANI over time, with an average of 17,882.34 kg N km-2 yr-1. In contrast, NAPI showed an initially increasing and then decreasing trend from 2000 to 2021, with an average value of 5,151.79 kg P km-2 yr-1. Fertilizer usage emerged as the primary source of nutrient inputs, accounting for approximately 63.42% of N and 61.88% of P inputs. Precipitation positively impacted the NANI and NAPI while temperature exerted a more influential but opposing effect. Time-lag effects were evident, as demonstrated by the stronger influences of temperature in preceding year on NANI and NAPI. Moreover, climate not only impacted the quantity of NANI and NAPI but also highly correlated to their changes, as well as the dynamics of their components. Through quantitative analyses, we unveiled key thresholds in the correlation between nutrient inputs and climate variables, with cutoffs of 14.1℃ in temperature and 820 mm in precipitation. These insights highlight the complex relationship between anthropogenic nutrient inputs and climate variability, underscoring the importance of sustainable management practices in the Dawen River Basin to mitigate negative environmental impacts. © 2024, The Authors. All rights reserved.

关键词： Nitrogen

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