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In-situ observation of nonmetallic inclusions in steel using confocal scanning laser microscopy:A review

International Journal of Minerals,Metallurgy and materials 2025年第5期32卷 975-991页

作者： Ying Ren Lifeng Zhang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Mechanical and Materials Engineering North China University of TechnologyBeijing 100144China

The characteristics of nonmetallic inclusions formed during steel production have a significant influence on steel *** this paper,studies on inclusions using confocal scanning laser microscopy(CSLM)are reviewed and summarized,particularly the col-lision of various inclusions,dissolution of inclusions in liquid slag,and reactions between inclusions and *** inclusions exhibited a high collision tendency,whereas pure liquid inclusions exhibited minimal collisions because of the small attraction force induced by their<90°contact angle with molten *** collision of complex inclusions in molten steel was not included in the scope of this study and should be evaluated in future *** CaO/Al_(2)O_(3)and CaO/SiO_(2)ratios in liquid slag promoted the dissolution of Al_(2)O_(3)-based *** formation of solid phases in the slag should be prevented to improve dissolution of *** accurately simulate the dissolution of inclusions in liquid slag,in-situ observation of the dissolution of inclusions at the steel-slag interface is *** a combination of CSLM and scanning electron microscopy-energy dispersive spectroscopy,the composition and morphological evolution of the inclusions during their modification by the dissolved elements in steel were observed and *** the in-situ observa-tion of MnS and TiN precipitations has been widely studied,the in-situ observation of the evolution of oxide inclusions in steel during so-lidification and heating processes has rarely been *** effects of temperature,heating and cooling rates,and inclusion character-istics on the formation of acicular ferrites(AFs)have been widely *** a cooling rate of 3-5 K/s,the order of AF growth rate in-duced by different inclusions,as reported in literature,is Ti-O

关键词： inclusion steel in-situ observation confocal scanning laser microscopy

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Real-Time Detection of Sub-ppm Aromatic Compounds in Alcohol by Surface Plasmon Resonance Using Label-Free Graphene

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Energy & Environmental materials 2025年第1期8卷 146-154页

作者： Sung Hwan Cho Jun Min Suh Wontaek Kim Jaehyun Kim Yeong Jae Kim Tae Hyung Lee Jae Young Kim Jaegun Sim Seung Won Choi Byung Hee Hong So Young Kim Ho Won Jang Department of Materials Science and Engineering Research Institute of Advanced Materials Seoul National University Department of Mechanical Engineering Massachusetts Institute of Technology Infra Analysis Team Global Manufacturing & Infra Technology Samsung Electronics Department of Chemistry Seoul National University

The increasing importance of high-purity isopropyl alcohol(IPA) in semiconductor processing technology has led to a higher demand for technologies capable of detecting impurities in I *** accurate and various impurity detection technologies have been developed,most of them have limitations in real-time and repeatable detection of ***,for the first time,surface plasmon resonance(SPR) sensor was developed utilizing graphene transferred Au film(Au/graphene) to detect sub-ppm levels of 2,4-dinitrophenol(2,4-DNP) dissolved in IPA and this sensor demonstrates the ability to detect 2,4-DNP in real-time with great reversibility.

关键词： density functional theory graphene liquid sensor surface plasmon resonance π–π stacking interaction

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Effects of Interface Anisotropy on the Solidification Morphology of Zinc Alloys and Development of Data Assimilation for Their Estimation

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Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan 2025年第6期111卷 326-335页

作者： Yamamura, Ayano Yasuda, Hideyuki Takaki, Tomohiro Graduate School of Science and Technology Kyoto Institute of Technology Japan Department of Materials Science and Engineering Kyoto University Japan Faculty of Mechanical Engineering Kyoto Institute of Technology Japan

The solid–liquid interface energy anisotropy of Zn alloys remains poorly understood. Recently, characteristic 14-arm dendritic growth has been observed using time-resolved X-ray computed tomography at SPring-8 during the solidification of a Zn–4mass%Al alloy. This study investigates the dependence of the dendrite morphologies of Zn alloys on solid–liquid interface energy anisotropy through systematic phase-field simulations of the growth of an isolated equiaxed dendrite. We also develop a data assimilation system to estimate the anisotropy parameters of solid–liquid interface energy and crystal orientation in Zn alloys and validate the system through twin experiments. This study provides insights into the solidification of Zn alloys and a powerful tool for their investigation. © 2025 The Iron and Steel Institute of Japan.

关键词： data assimilation dendrite phase-field method solidification solid–liquid interface energy zinc alloy

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Prediction of intrusive gas pores caused by resin burning in sand core for iron castings

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China Foundry 2025年第1期22卷 23-32页

作者： Ji-wu Wang Xiao-long Wang Yu-cheng Sun Yu-hang Huang Xiu-ming Chen Xiong-zhi Wu Na Li Jin-wu Kang Tao Jing Tian-you Huang Hai-liang Yu School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Weichai Power Co. Ltd.Weifang 261061ShandongChina School of Mechanical Engineering Central South UniversityChangsha 41000China School of Materials Science and Engineering Key Laboratory for Advanced Materials Processing TechnologyTsinghua UniversityBeijing 100084China

In the production of castings,intrusive gas pore represents a kind of common defects which can lead to leakage in high gas-tightness requirement castings,such as cylinder blocks and cylinder heads for *** occurs due to the intrusion of gases generated during the resin burning of the sand core into castings during the casting ***,a gas generation and flow constitution model was established,in which the gas generation rate is a function of temperature and time,and the flow of gas is controlled by the gas release,conservation,and Darcy's *** heat transfer and gas flow during casting process was numerically *** dangerous point of cores is firstly identified by a virtual heat transfer method based on the similarity between heat transfer and gas flow in the sand *** gas pores in castings are predicted by the gas pressure,the viscosity and state of the melt for these dangerous *** distinct sand core structures were designed and used for the production of iron castings,and the simulated gas pore results were validated by the obtained castings.

关键词： gas pore numerical simulation iron casting sand core resin

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Deformation Behavior of Commercially Pure Titanium Subjected to Blast Assisted Deformation: New Insights on f112̅1g Extension Twinning

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materials Transactions 2025年第5期66卷 521-531页

作者： Bisht, Anuj Subburaj, Janardhanraj Jagadeesh, Gopalan Suwas, Satyam Department of Mechanical and Industrial Engineering Indian Institute of Technology Roorkee Roorkee India Department of Aerospace Engineering Indian Institute of Science Bangalore India Department of Materials Engineering Indian Institute of Science Bangalore India

In the present work, the microstructure and texture evolution in commercially pure titanium subjected to blast assisted deformation has been investigated by means of electron backscattered diffraction and transmission electron microscopy. The evolved texture in the deformed material is primarily attributed to the dominant h1¯010i 64.4° contraction twinning. Other deformation twins were also observed in a low fraction. A uniform dislocation background with other microstructural features observed suggested the formation of a superimposed microstructure in the material. f112¯1g extension twins (ET2) with a thick uniform pile-up of dislocation along its boundary have formed in the material. Parts of ET2 have detwinned leaving gaps along the twin length, revealing the unstable nature of ET2 twins. The in-depth microstructural analysis reveals the ET2 twin formation mechanism, where the instability developed in the material due to progressive lattice rotation via accumulative slip is relieved by ET2 twin formation by atomic shuffling. The gaps (local detwinning) observed in the present case is attributed to the transient oscillatory response of the material under impulsive loading, which has been previously reported in the literature. ©2025 The Japan Institute of Metals and materials.

关键词： High resolution transmission electron microscopy

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Reactive self-consumption strategy to suppress SiO_(2) phase transition-induced cracking

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Journal of Advanced Ceramics 2025年第3期14卷 121-131页

作者： Lin Chen Shu-Wen Li Chang-Jiu Li Qiang Zhang Guan-Jun Yang State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China AECC Beijing Institute of Aeronautical Material Beijing 100095China

The lifetime of Si bond coats in environmental barrier coatings(EBCs)is constrained by phase transition-induced cracking at the SiO_(2) *** this study,reactive self-consumption and lattice solid solution strategies are employed to address this limitation via Si-Yb_(4)Al_(2)O_(9)composite *** formation of an Yb_(2)Si_(2)O_(7)layer,through the consumption of the thermally grown SiO_(2) scale and Yb₄Al₂O₉,reduces the SiO₂thickness and significantly lowers the cracking driving ***,the incorporation of Al into the SiO_(2)lattice stabilizes high-temperatureβ-SiO_(2),preventing phase transition-induced *** proposed coating demonstrated an oxidation lifetime 20 times longer than that of pure Si at 1370℃,highlighting its potential as an EBC bond coating.

关键词： environmental barrier coatings bond coating oxidation phase transition cracking

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Revealing Hetero-Deformation Induced(HDI)Hardening and Dislocation Activity in a Dual-Heterostructure Magnesium Matrix Composite

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Journal of Magnesium and Alloys 2025年第2期13卷 902-921页

作者： Lingling Fan Ran Ni Lingbao Ren Peng Xiao Ying Zeng Dongdi Yin Hajo Dieringa Yuanding Huang Gaofeng Quan Wei Feng School of Mechanical Engineering Chengdu UniversitySichuanChengdu 610106PR China School of Materials Science and Engineering Southwest Jiaotong UniversitySichuanChengdu 610031PR China State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi'an Jiaotong UniversityShanxiXi'an 710049PR China Institute of Material and Process Design Helmholtz-Zentrum HereonGeesthacht 21502Germany Institute of Metallic Biomaterials Helmholtz-Zentrum HereonGeesthacht 21502Germany

Integrating a heterogeneous structure can significantly enhance the strength-ductility synergy of ***,the relationship between hetero-deformation induced(HDI)strain hardening and dislocation activity caused by heterogeneous structures in the magnesium matrix composite remains *** this study,a dual-heterogeneous TiC/AZ61 composite exhibits significantly improved plastic elongation(PEL)by nearly one time compared to uniform FG composite,meanwhile maintaining a high strength(UTS:417 MPa).This is because more severe deformation inhomogeneity in heterogeneous structure leads to more geometrically necessary dislocations(GNDs)accumulation and stronger HDI stress,resulting in higher HDI hardening compared to FG and CG *** the early stage of plastic deformation,the pile-up types of GND in the FG zone and CG zone are significantly *** tend to form substructures in the FG zone instead of the CG *** only accumulate at grain boundaries of the CG region,thereby leading to obviously increased back stress in the CG *** the late deformation stage,the elevated HDI stress activates the new〈c+a〉dislocations in the CG region,resulting in dislocation entanglements and even the formation of substructures,further driving the high hardening in the heterogeneous ***,For CG composite,〈c+a〉dislocations are not activated even under large plastic strains,and only〈a〉dislocations pile up at grain boundaries and twin *** work provides an in-depth understanding of dislocation variation and HDI hardening in heterogeneous magnesium-based composites.

关键词： Mg-matrix composite Heterogeneous structure HDI hardening GND density Dislocation

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High-performance self-rectifying memristor array based on Pt/HfO_(2)/Ta_(2)O_(5−x)/Ti structure for flexible electronics

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Nano Research 2025年第2期18卷 708-716页

作者： Shang He Xiaoyu Ye Xiaojian Zhu Qing Zhong Yulin Liu Gang Li Rui Liu Xiaohan Meng Yongguang Xiao Shaoan Yan Minghua Tang School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China Chinese Academy of Sciences(CAS)Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China School of Mechanical Engineering and Mechanics Xiangtan UniversityXiangtan 411105China

Self-rectifying memristor(SRM)arrays hold tremendous potential in high-density data storage and energy efficient neuromorphic ***,SRM arrays are mostly developed on rigid substrates and lack mechanical flexibility,limiting their applications in intelligent electronic skin,wearable technologies,***,we present a high performance SRM array based on Pt/HfO_(2)/Ta_(2)O_(5−x)/Ti heterojunctions,which can be fabricated on a flexible polyimides(PI)substrate and demonstrates exceptional memristive performance under bending conditions(bending radius(R)=1 cm,rectifying ratio>10^(4),retention time>10^(4) s and endurance>105 cycles).We demonstrate a 16×16 flexible memristor array offering noise filtering and data storage capabilities,which can be used to accurately process and store the signals transmitted by a pressure sensor *** research represents an important advancement towards the realization of next-generation high-performance flexible electronics.

关键词： self-rectifying memristor crossbar array flexible electronics noise filtering tactile memory

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Influence of introducing Zr,Ti,Nb and Ce elements on externally solidified crystals and mechanical properties of high-pressure die-casting Al–Si alloy

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International Journal of Minerals,Metallurgy and materials 2025年第1期32卷 147-153页

作者： Junjie Li Wenbo Yu Zhenyu Sun Weichen Zheng Liangwei Zhang Yanling Xue Wenning Liu Shoumei Xiong Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Traffic&Transportation Engineering Central South UniversityChangsha 410075China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

High pressure die casting(HPDC)AlSi10Mn Mg alloy castings are widely used in the automobile *** can optimize the mechanical properties of castings through heat treatment,while the release of thermal stress arouses the deformation of large integrated ***,the development of non-heat treatment Al alloys is becoming the hot *** addition,HPDC contains externally solidified crystals(ESCs),which are detrimental to the mechanical properties of *** achieve high strength and toughness of non-heat treatment die-casting Al-Si alloy,we used AlSi9Mn alloy as matrix with the introduction of Zr,Ti,Nb,and *** influences on ESCs and mechanical properties were systematically investigated through three-dimensional reconstruction and thermodynamic *** results reveal that the addition of Ti increased ESCs'size and porosity,while the introduction of Nb refined ESCs and decreased ***,large-sized Al_3(Zr,Ti)phases formed and degraded the mechanical *** introduction of Ce resulted in the poisoning effect and reduced mechanical properties.

关键词： aluminium alloy high-pressure die-casting externally solidified crystals non-heat treatment

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Dynamic modeling of a three-dimensional braided composite thin plate considering braiding directions

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 123-138页

作者： Chentong GAO Huiyu SUN Jianping GU W.M.HUANG College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore 639798Singapore Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology School of Materials Science and EngineeringNanjing Institute of TechnologyNanjing 211100China

Currently,there are a limited number of dynamic models available for braided composite plates with large overall motions,despite the incorporation of three-dimensional(3D)braided composites into rotating blade *** this paper,a dynamic model of 3D 4-directional braided composite thin plates considering braiding directions is *** on Kirchhoff's plate assumptions,the displacement variables of the plate are *** incorporating the braiding directions into the constitutive equation of the braided composites,the dynamic model of the plate considering braiding directions is *** effects of the speeds,braiding directions,and braided angles on the responses of the plate with fixed-axis rotation and translational motion,respectively,are *** paper presents a dynamic theory for calculating the deformation of 3D braided composite structures undergoing both translational and rotational *** also provides a simulation method for investigating the dynamic behavior of non-isotropic material plates in various applications.

关键词： three-dimensional(3D)braided composite braiding direction composite thin plate large overall motion dynamic model

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