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Crevice corrosion of reinforcing steel in carbonated simulated concrete pore solutions contaminated by chloride

Journal of Iron and Steel Research International 2025年第1期32卷 293-311页

作者： Peng-peng Wu Yuan-pei Gong Shao-hua Zhang Yue-zhong Zhang Bao-sheng Liu Guang-ling Song College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan030024ShanxiChina College of Chemical Engineering and Technology Taiyuan University of Science and TechnologyTaiyuan030024ShanxiChina Department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhen518055GuangdongChina School of Mechanical and Mining Engineering Centre for Advanced Materials Processing and Manufacturing(AMPAM)The University of QueenslandSt LuciaQLD4072Australia State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen UniversityXiamen361005FujianChina

The crevice corrosion of the reinforcing steel in the carbonated simulated concrete pore solutions(SCPSs)containing 0.04 mol/L chloride was *** comparison,the steel without crevice covered on its surface was also *** showed that the crevice corrosion in the uncarbonated SCPS was not triggered and the steel remained passivity by suppressing the anodic dissolution in the crevice *** SCPS was carbonated to have pH values of 10.5 and 11.5,the crevice corrosion was easier to be activated than the widely reported pitting corrosion owing to the rapid oxygen depletion within the crevice,but the crevice corrosion damage might be alleviated to a certain extent due to the relative compact surface film formed inside the *** further carbonation led to the activation dissolution of both the crevice interior and exterior,causing the more serious corrosion *** process of the crevice corrosion was systematically analyzed by combining the electrochemical measurement results and Evens polarization diagram.

关键词： Crevice corrosion Reinforcing steel Carbonation Electrochemical test Rust Evens polarization diagram

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Temperature-dependent microstructural evolution in a compositionally complex solid electrolyte:The role of a grain boundary transition

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Journal of Advanced Ceramics 2025年第3期14卷 163-176页

作者： Shu-Ting Ko Chaojie Du Huiming Guo Hasti Vahidi Jenna L.Wardini Tom Lee Yi Liu Jingjing Yang Francisco Guzman Timothy J.Rupert William J.Bowman Shen J.Dillon Xiaoqing Pan Jian Luo Aiiso Yufeng Li Family Department of Chemical and Nano Engineering University of California San DiegoLa JollaCalifornia 92093USA Program in Materials Science and Engineering University of California San DiegoLa JollaCalifornia 92093USA Department of Materials Science and Engineering University of California IrvineIrvineCalifornia 92697USA Department of Physics and Astronomy University of California IrvineIrvineCalifornia 92697USA Irvine Materials Research Institute University of California IrvineIrvineCalifornia 92697USA

Compositionally complex solid electrolyte(Li_(0.375)Sr_(0.4375))(Ta_(0.375)Nb_(0.375)Zr_(0.125)Hf_(0.125))O_(3)(LSTNZH)samples are synthesized using different sintering temperatures,durations,and cooling conditions(furnace cooling(FC)*** quenching(AQ)).The temperature-dependent grain growth has been examined to investigate the microstructural evolution and the origin of exaggerated(abnormal)grain *** moderate temperatures,the grain growth of LSTNZH follows a cubic root growth model with an Arrhenius temperature *** increasing temperature,bimodal microstructures develop,and the Arrhenius temperature dependence breaks ***,increasing the temperature induces increased Nb segregation at general grain boundaries(GBs),in contrast to classical GB segregation models but suggesting premelting-like GB disordering,which can explain the observed abnormal grain growth(AGG).In addition,the large grains become faceted with increasing temperature,which occurs concurrently with the temperature-induced transitions in GB segregation and grain growth,thereby further supporting the occurrence of a GB phase-like(complexion)*** impacts on the densification,ionic conductivity,and hardness are also *** work provides a new insight into the fundamental understanding of the grain growth mechanisms of the emergent class of medium-and high-entropy compositionally complex ceramics(CCCs),which is essential for tailoring microstructures and material properties.

关键词： compositionally complex ceramics(CCCs) solid electrolytes perovskite grain growth grain boundary(GB) electron backscatter diffraction(EBSD)

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Track-Rex:A universal toolbox for tracking recrystallization nucleation and grain growth behaviors in polycrystalline materials

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Journal of materials science & Technology 2024年第30期197卷 149-159页

作者： Xun Zeng Haoran Yi Zhuoran Zeng Liang Yuan Sangbong Yi Junheng Gao Mark Rainforth Dikai Guan Department of Mechanical Engineering University of SouthamptonSouthamptonSO171BJUK College of Engineering and Computer Science Australian National UniversityACT 2601Australia College of Bioresources Chemical and Materials Engineering Shaanxi University of Science and TechnologyXi’an710021China Institute of Materials and Process Design Helmholtz-Zentrum HereonGeesthacht21502Germany Department of Materials Science and Engineering University of SheffieldSheffieldS13JDUK Institute for Carbon Neutrality University of Science and Technology BeijingNo.30 Xueyuan RoadHaidian DistrictBeijing100083China

Recrystallization annealing is widely used to tailor the microstructure and enhance the performance of cold-deformed metallic ***,the underlying recrystallization mechanisms are debated,even with the use of cutting-edge characterization ***,we develop a Track-Rex toolbox to analyze quasi-in-situ electron backscatter diffraction(EBSD)datasets of two magnesium(Mg)alloys dur-ing static recrystallization via grain *** results show that the recrystallized grains do not always grow;instead,they can shrink or even be *** is attributed to the presence of newly formed recrystallized grains that possess a growth advantage over the old recrystallized *** rare earth containing Mg-2.4Zn-0.2Ce wt.%(ZE20)alloy exhibits a higher nucleation activity in the shear bands compared to the commercial Mg-3Al-1 Zn(AZ31)*** of the nucleation timing and sites,re-crystallized grains in the ZE20 alloy show consistent off-basal orientations,serving as the origin of the rare earth ***,the off-basal texture of these recrystallized grains is further strengthened through preferential growth during subsequent *** the contrary,the recrystallized grains in the AZ31 exhibit scattered basal orientations that grow uniformly,resulting in a weak basal texture.

关键词： Grain correlation Grain tracking Recrystallization Texture Mg alloys

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Ultra-flexible graphene/nylon/PDMS coaxial fiber-shaped multifunctional sensor

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Nano Research 2023年第4期16卷 5541-5547页

作者： Peddathimula Puneetha Siva Pratap Reddy Mallem Sung Cheol Park Seoha Kim Dong Hun Heo Cheol Min Kim Jaesool Shim Sung Jin An Dong-Yeon Lee Kwi-Il Park Department of Robotics and Intelligent Machine Engineering/College of Mechanical and IT Engineering Yeungnam UniversityGyeongsan 38541Republic of Korea School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Advanced Material Research Center Kumoh National Institute of TechnologyGumi 39177Republic of Korea School of Mechanical Engineering Yeungnam UniversityGyeongsan 38541Republic of Korea Department of Materials Science and Engineering Kumoh National Institute of TechnologyGumi 39177Republic of Korea

The development of flexible and wearable devices is mainly required for tactile sensing;as such devices can adapt to complicated nonuniform surfaces,they can be applied to the human ***,it remains necessary to simultaneously achieve small-scale,portable,and stable developments in such ***,this work aims at fabricating a novel,lightweight,ultra-flexible,and fiber-shaped coaxial structure with a diameter of 0.51 mm using polydimethylsiloxane/graphene/nylon material,based on piezoresistive and triboelectric *** piezoresistive-based robotic-hand-controlled sensor thus realized exhibits a response time of 120 ms and a fast recovery time of 55 ***,the piezoresistive-based sensors effectively feature whisker/joystick-guided behaviors and also sense the human finger *** to the triboelectric-based selfpowered nanogenerator behavior,the resulting sensor can convert mechanical motion into electrical energy,without adversely affecting human ***,this triboelectric-based human finger sensor can be operated under different bending modes at specific ***,this multifunctional sensor is cost-effective and suitable for various applications,including robotichand-controlled operations in medical surgery,whisker/joystick motions in lightweight drone technology,and navigation with highsensitivity components.

关键词： extremely lightweight ultra-flexible piezoresistive/triboelectric sensor human-machine whisker

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Polar materials for photocatalytic applications:A critical review

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Interdisciplinary materials 2024年第4期3卷 530-564页

作者： Xiaoqing Liu Yu Zhang Cong Wang Lei Shen Department of Mechanical Engineering National University of SingaporeSingaporeSingapore School of Physics Harbin Institute of TechnologyHarbinPR China School of Materials Science and Engineering Engineering Research Center of Optoelectronic Functional MaterialsMinistry of EducationChangchun University of Science and TechnologyChangchunPR China

The critical challenges of the energy crisis and environmental degradation promote innovative approaches for energy ***-based photocatalytic technology,which transforms solar energy into chemical energy,emerges as a promising ***,the practical application of this technology faces several challenges,such as the rapid recombination of photogenerated electrons and holes,significantly limiting photocatalytic *** this review,we provide a detailed discussion,an insightful perspective,and a critical evaluation of recent advances,challenges,and opportunities in the field of photocatalysis using polar *** present a comprehensive examination of the photocatalytic mechanisms,activity,and diverse applications of photocatalysts based on polar *** also briefly discuss the engineering design of polar photocatalysis in experiments and its scalability in the *** review outlines future trends and potential breakthroughs in the photocatalytic field using polar materials,projecting their transformative impact on environmental chemistry and energy engineering.

关键词： 2D Janus structures ferroelectric materials heterostructures photocatalysts polar materials

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Tailoring properties of directed energy deposited Al-Mg alloy by balancing laser shock peening and heat treatment

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Journal of materials science & Technology 2024年第36期203卷 78-96页

作者： Wei Dai Wei Guo Jun Xiao Ying Zhu Zewu Qi Jiaxin Shi Changhao Yin Dongsheng He Jiaxuan Chi Zhandong Wan Baoqiang Cong Minggao Li Hongqiang Zhang School of Mechanical Engineering and Automation Beihang UniversityBeijing100191China School of Materials Science and Engineering Beihang UniversityBeijing100191China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing100124China Technology Research Department CRRC InstituteBeijing100070China

Wire arc-directed energy deposition(WADED)has shown great advantages and potential in fabricating large-scale aluminum(Al)alloy ***,WADED Al alloys typically exhibit low strength and reliability due to pore defects and lack of work hardening or precipitation *** study utilized a combination of laser shock peening(LSP)and annealing to regulate the microstructure of WADED Al-Mg4.5Mn alloy and enhance mechanical *** effects of LSP and annealing on phase composition,pore distribution,and microstructures at multiple scales were systematically investigated to reveal the mechanical property improving *** results demonstrated that LSP-induced plastic deformation formed a defect-free zone by closing near-surface pore *** created the hardened layer with gradient mechanical properties by inducing gradient changes in grain size,the number of low-angle grain boundaries(LAGBs),and dislocation density along the depth *** annealing process promoted grain coarsening and reduced excessive dislocations and LAGBs,weakening the work harden-ing effect caused by ***,the high-density dislocations and high stored energy generated by LSP accelerated the recrystallization,facilitating growth of near-surface *** defect-free zone,dislocation strengthening,and LAGBs strengthening were responsible for the increase in strength,while the synergistic deformation between hardened layers and soft core facilitated maintaining excellent *** strength and elongation of WADED Al alloy can be synergistically improved by balancing the effects of LSP and heat treatment.

关键词： Wire arc-directed energy deposition Aluminum alloy Laser shock peening Pore distribution Tensile property

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Electronic structure prediction of multimillion atom systems through uncertainty quantification enabled transfer learning

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npj Computational materials 2024年第1期10卷 1423-1437页

作者： Shashank Pathrudkar Ponkrshnan Thiagarajan Shivang Agarwal Amartya S.Banerjee Susanta Ghosh Department of Mechanical Engineering-Engineering Mechanics Michigan Technological UniversityHoughtonMIUSA Department of Electrical and Computer Engineering University of CaliforniaLos AngelesCA90095USA Department of Materials Science and Engineering University of CaliforniaLos AngelesCA90095USA Faculty member of the Center for Data Sciences Michigan Technological UniversityHoughtonMIUSA

The ground state electron density—obtainable using Kohn-Sham Density Functional Theory(KSDFT)simulations—contains a wealth of material information,making its prediction via machine learning(ML)models ***,the computational expense of KS-DFT scales cubically with system size which tends to stymie training data generation,making it difficult to develop quantifiably accurate ML models that are applicable across many scales and system ***,we address this fundamental challenge by employing transfer learning to leverage the multi-scale nature of the training data,while comprehensively sampling systemconfigurations using *** ML models are less reliant on heuristics,and being based on Bayesian neural networks,enable uncertainty *** show that our models incur significantly lower data generation costs while allowing confident—and when verifiable,accurate—predictions for a wide variety of bulk systems well beyond training,including systems with defects,different alloy compositions,and at multi-million-atom ***,such predictions can be carried out using only modest computational resources.

关键词： alloy prediction transfer

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Material-based model for the simulation of underwater welding

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Welding and Cutting 2023年第1期2023卷 24-29页

作者： Reich, Michael Schumacher, Philipp Klett, Jan Hassel, Thomas Keßler, Olaf Faculty of Mechanical Engineering and Marine University of Rostock Germany SLM Solutions Group AG Germany Institute of Materials Science University of Hannover Germany UWTH Division Institute for Materials Science University of Hanover Germany Department of Materials Engineering Faculty of Mechanical Engineering and Marine Technologies University of Rostock Germany

The numerical simulation of welding processes belongs to the state of the art for conventional structural steels in dry conditions. It is a proven method for the planning of welding work. For the design of hyperbaric wet welded joints no application of numerical simulations has been found, so far. This is due to the lack of knowledge regarding the specific boundary conditions of a wet welding environment, such as the heat transfer between workpiece and water or the material behaviour at highest cooling rates. The work presented shows viable solutions to implement the peculiarities of hyperbaric wet welding into simulation programs. © 2023, DVS Media GmbH. All rights reserved.

关键词： Numerical models

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Towards atom-level understanding of metal oxide catalysts for the oxygen evolution reaction with machine learning

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npj Computational materials 2024年第1期10卷 2430-2440页

作者： Jaclyn R.Lunger Jessica Karaguesian Hoje Chun Jiayu Peng Yitong Tseo Chung Hsuan Shan Byungchan Han Yang Shao-Horn Rafael Gómez-Bombarelli Department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA Center for Computational Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA Department of Chemical and Biomolecular Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Computational and Systems Biology Massachusetts Institute of TechnologyCambridgeMA 02139USA Department of Materials Science and Engineering University of TorontoTorontoON M5SCanada Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA Research Laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMA 02139USA

Green hydrogen production is crucial for a sustainable future,but current catalysts for the oxygen evolution reaction(OER)suffer from slow kinetics,despite many efforts to produce optimal designs,particularly through the calculation of descriptors for *** this study,we develop a dataset of density functional theory calculations of bulk and surface perovskite oxides,and adsorption energies of OER intermediates,which includes compositions up to quaternary and facets up to(555).We demonstrate that per-site properties of perovskite oxides such as Bader charge or band center can be tuned through element substitution and faceting,and develop a machine learning model that accurately predicts these properties directly from the local chemical *** leverage these per-site properties to identify promising perovskites with high theoretical OER *** identified design principles and promising materials provide a roadmap for closing the gap between current artificial catalysts and biological enzymes such as photosystem II.

关键词： perovskite oxides kinetics

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Physics through the microscope

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Chinese Physics B 2024年第11期33卷 1-11页

作者： Stephen J.Pennycook Ryo Ishikawa Haijun Wu Xiaoxu Zhao Changjian Li Duane Loh Jiadong Dan Wu Zhou School of Physical Sciences and CAS Key Laboratory of Vacuum Physics University of Chinese Academy of SciencesBeijing 100049China Department of Materials Science and Engineering University of TennesseeKnoxvilleTN37996USA Institute of Engineering Innovation University of TokyoTokyo 113-8656Japan State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an 710049China School of Materials Science and Engineering Peking UniversityBeijing 100871China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Physics National University of SingaporeSingapore 117551Singapore Department of Biological Sciences National University of SingaporeSingapore 117558Singapore

The electron microscope provides numerous insights into physics, from demonstrations of fundamental quantummechanical principles to the physics of imaging and materials. It reveals the atomic and electronic structure of key regionssuch as defects and interfaces. We can learn the underlying physics governing properties, and gain insight into how tosynthesize new materials with improved properties. Some recent advances and possible future directions are discussed.

关键词： scanning transmission electron microscopy materials science point defects artificial intelligence

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