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Gradient microstructure,recrystallization and mechanical properties of copper processed by high pressure surface rolling

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Journal of materials science & Technology 2022年第31期126卷 182-190页

作者： J.Guo Q.Y.He Q.S.Mei X.Huang G.L.Wu O.V.Mishin College of Materials Science and Engineering Chongqing UniversityChongqing400045China Southwest Technology and Engineering Research Institute Chongqing 400039China School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Department of Mechanical Engineering Technical University of Denmark2800 Kgs.LyngbyDenmark

The microstructure,hardness and tensile properties have been studied in copper processed by high pressure surface rolling(HPSR)both in the as-deformed condition and after subsequent annealing at 150℃.It is found that a gradient structure with significant differences in the scale of microstructural features is formed by *** deformed microstructure varies from nano-and ultrafine-scale structures with a large fraction of high angle boundaries near the surface to lightly deformed grains at depths of 1-3 mm below the *** tests of 1-mm-thick specimens demonstrate that the asdeformed material has a high strength and a low uniform *** at 150℃results in partial recrystallization,which creates new through-thickness *** for the topmost layer and several bands in the adjacent layer,recrystallization is more pronounced close to the *** fraction recrystallized is at least 80%at depths of 60-300μm after annealing for 960 *** fraction recrystallized in the subsurface decreases with increasing depth,and the deformed layer at depths greater than 500μm re-mains largely non-recrystallized after *** partially recrystallized condition demonstrates an improved combination of strength and ductility.

关键词： High pressure surface rolling Copper Gradient microstructure Annealing Hardness Strength Ductility

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Morphology controllable urchin-shaped bimetallic nickel-cobalt oxide/carbon composites with enhanced electromagnetic wave absorption performance

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Journal of materials science & Technology 2023年第17期148卷 250-259页

作者： Fushan Li Qiuyu Li Hideo Kimura Xiubo Xie Xiaoyu Zhang Nannan Wu Xueqin Sun Ben Bin Xu Hassan Algadi Rami Adel Pashameah Abdullah K.Alanazi Eman Alzahrani Handong Li Wei Du Zhanhu Guo Chuanxin Hou School of Environmental and Material Engineering Yantai UniversityYantai 264005China Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai 264005China School of Material Science and Engineering Shandong University of Science and TechnologyQingdao 266590China Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Electrical Engineering Faculty of EngineeringNajran UniversityNajran 11001Saudi Arabia Department of Chemistry Faculty of Applied ScienceUmm Al-Qura UniversityMakkah 24230Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Integrated Composites Laboratory(ICL) Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon Tyne NE18STUK Department of Chemical and Bimolecular Engineering University of TennesseeKnoxvilleTN 37996United States

The microscopic morphology of electromagnetic wave absorbers influences the multiple reflections of electromagnetic waves and impedance matching,determining the absorption ***,the urchin-shaped bimetallic nickel-cobalt oxide/carbon(NiCo_(2)O_(4)/C)composites are prepared via a hy-drothermal route,whose absorption properties are investigated by different morphologies regulated by changing calcination temperature.A minimum reflection loss(RL_(min))of-75.26 dB is achieved at a match-ing thickness of 1.5 mm,and the effective absorption bandwidth(EAB)of 8.96 GHz is achieved at 2 ***-advantages of the synthesized NiCo_(2)O_(4)/C composites contribute to satisfactory absorption ***,the interweaving of the needle-like structures increases the opportunities for scattering and multiple reflections of incident electromagnetic waves,and builds up a conductive network to facilitate the enhancement of conductive ***,the carbon component in the NiCo_(2)O_(4)/C composites en-hances the interfacial polarization and reduces the density of the ***,generous oxygen va-cancy defects are introduced into the NiCo_(2)O_(4)/C composites,which induces defect polarization and dipole *** summary,the ternary coordination of components,defects and morphology led to out-standing electromagnetic wave absorption,which lightened the path for improving the electromagnetic wave absorption property and enriching the family of NiCo_(2)O_(4) absorbers with excellent performance.

关键词： NiCo_(2)O_(4)/C Oxygen vacancies Interfacial polarization Electromagnetic wave absorber

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Delayed plasticity during spherical nanoindentation of an iron-chromium-aluminum alloy:Effect of ferric ion irradiation

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Journal of materials science & Technology 2023年第36期167卷 228-236页

作者： Y.Zhang C.W.Li J.L.Jiang J.F.Gu H.Wang Y.D.Jia G.Wang X.G.An Q.Wang J.Lu Institute of Materials Shanghai UniversityShanghai 200072China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Mechanical Engineering City University of Hong KongKowloonSARChina Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610041China Interdisciplinary Materials Research Center Institute for Advanced StudyChengdu UniversityChengdu610106China

Spherical nanoindentation of an iron-chromium-aluminum alloy was conducted to study the effect of ferric-ion(Fe 3+)irradiation on the time-dependent plasticity behavior in the surface layers of this *** was observed that the initiation of plasticity by the appearance of displacement burst or“pop-in”event occurred after a period of waiting time in the apparent elastic regime and that Fe^(3+)irradiation at 360°C and up to∼0.5 displacements per atom could make it happen under the lower applied loads but with a reduced *** the experimental data,an activation volume and activation energy were extracted for the delayed *** results show that Fe^(3+)-irradiation significantly reduced its acti-vation volume from∼3.05 b 3 to∼1.75 b 3(where b=Burgers vector),but slightly increased its activation energy from∼0.65 to∼0.71 *** the other hand,high-resolution scanning transmission electron mi-croscopy observations reveal that the irradiation at the elevated temperature created interstitial atom pair onto the(100)habit plane that can serve as the nucleation site of a100dislocation loop while elim-inating the pre-existing ***,it is indicated that heterogeneous nucleation of the dislocation loop was predominant in the delayed plasticity initiation of this alloy and that the nucleation of the interstitial-type dislocation loop was involved due to Fe^(3+)-irradiation.

关键词： Spherical nanoindentation Delayed plasticity FeCrAl alloy Fe^(3+)-irradiation

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Additive manufacturing of immiscible/incompatible systems

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materials Today 2025年 87卷 125-150页

作者： Das, Rakesh Joshi, Sameehan S. Owuor, Peter Samora Khan, Abdullah Ike, Sandra Kumar, Pankaj Dahotre, Narendra B. Tiwary, Chandra Sekhar Department of Metallurgical & Materials Engineering Indian Institute of Technology Kharagpur West Bengal 721003 India Materials Science and Engineering Center for Agile and Adaptive Additive Manufacturing University of North Texas DentonTX76207 United States Carbon Center of Excellence Morgan Advanced Materials State College PA16803 United States The John and Willie Leone Family Department of Energy and Mineral Engineering Penn State University 16801 United States Department of Mechanical Engineering University of New Mexico AlbuquerqueNM87131 United States

The advent of additive manufacturing (AM) has propelled significant innovation in industries due to its capacity for technological advancement as a sustainable, adaptable, and personalized manufacturing method. Exploring the (AM) of immiscible systems is a critical area that requires exploration to achieve both multifunctionalities of different elements or phases and stability during the service period. The review commences with an overview of the fundamental AM processes followed by an in-depth case study of the innovation in this immiscible alloy and composite development. We have also systematically illustrated AM of immiscible systems and development in design and material innovations. A framework is provided to computationally model various AM processes tailored for immiscible/incompatible systems. In the end, the current obstacles with limitations of AM techniques in manufacturing immiscible systems are highlighted, followed by their prospects for possible future innovations. AM can precisely control the microstructure of immiscible systems through tailored processing parameters and has the ability to create functionally graded materials where immiscible phases serve specific roles. © 2025 Elsevier Ltd

关键词： Functionally graded materials

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A Novel Machine Learning Approach for Detection of Coronary Artery Disease Using Reduced Non-linear and Chaos Features

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International Journal Bioautomation 2022年第3期26卷 273-296页

作者： Singh, Ram Sewak Gelmecha, Demissie Jobir Mishra, Satyasis Dengia, Gemechu Sinha, Devendra Kumar Department School of Electrical & Computing Engineering Adama Science & Technology University Adama Ethiopia Mechanical Design & Manufacturing Engineering Department Center of Excellence in Advanced Manufacturing Engineering School of Mechanical Chemical & Materials Engineering Adama Science & Technology University Adama Ethiopia

In this research paper, authors present an automated system in this paper that integrates a ranking technique with Principal Component Analysis (PCA), Generalized Discriminant Analysis (GDA) and a 1-Norm Bidirectional Extreme Learning Machine (1-NBELM) to reliably classify normal and coronary artery disease groups. Twenty chaotic and non-linear attributes were hauling out from the Heart Rate Variability (HRV) signal to detect coronary artery disease groups. The HRV data for this study derived from a typical database of Normal Old (ELY), Young (YNG), and Coronary Artery Disease (CAD) people. Fisher, Wilcoxon and Bhattacharya were used to compute the rankings of attributes. GDA then turned the ranking features into a new feature. The Radial Basis Function (RBF) kernel was used to transfer original features to a high-dimensional feature space in GDA and PCA, and then it was deployed to 1-NBELM, which utilized the sigmoidal or multiquadric non-linear activation. Numerical experiments were performed on the combination of database sets as Young-ELY, Healthy-CAD, and Healthy ELY-CAD subjects. The numerical results show that ROC with GDA and 1-NBELM approach achieved an accuracy of 98.12±0.14, 96.21±0.12 and 99.87±0.28 for Young-CAD, Young-ELY and Healthy ELY-CAD groups with the use of sigmoidal and multiquadric activation function. The Fisher with GDA and 1-NBELM and Bhattacharya with GDA and 1-Norm Extreme Learning Machine (1-NELM) approach achieved an accuracy of 99.98±0.21 for all databases. © 2022 by the authors. Licensee Institute of Biophysics and Biomedical engineering, Bulgarian Academy of sciences. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://***/licenses/by/4.0/).

关键词： Principal component analysis

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Exploring the evolution of microstructure and mechanical property of aγʹ-strengthened Co-based single crystal superalloy during creep and thermal exposure at 1000℃

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Journal of materials science & Technology 2024年第36期203卷 39-52页

作者： Zhen Xu Chuan Guo Yu Li Zhiwei Lv Xiaogang Hu Xinggang Li Qiang Zhu Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials Shenzhen 518055China CityU-Shenzhen Futian Research Institute Shenzhen 518045China

The study provided a systematic investigation into the creep behavior of aγʹ-strengthened Co-based single crystal superalloy Co-7Al-8W-1Ta-4Ti(at.%)under compressive creep conditions at 1000℃and 137 ***,the microstructural changes during thermal exposure at 1000℃ were thor-oughly *** microstructure analysis of the creep samples revealed the presence ofγ/γʹrafts,twins,stacking faults,and dislocation *** analyses were conducted to assess the dimen-sions and volume fractions ofγʹ,alongside Vickers hardness tests and nanoindentation ***-sults show thatγʹdissolution in the creep samples with substantially higher dissolution rates compared to thermal *** Co depletion and Ti enrichment in twin is observed in creep sample,po-tentially initiating localized phase ***,lattice rotation occurred during creep,resulting in a progressive deviation of crystal orientation away from the[001]*** faults transitioned from network-like structures to parallel configurations,and twins played a significant role in creep deformation,particularly in samples subjected to 382 h *** study also explored the evo-lution of Vickers hardness and the elastic modulus,introducing a systematic linear model to describe Vickers hardness changes during both thermal exposure and creep conditions.

关键词： Superalloy Compressive creep Thermal exposure Vickers hardness Twinning

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Structure evolution andτ_(f)influence mechanism of Bi_(1-x)Ho_(x)VO_(4)microwave dielectric ceramics for LTCC applications

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Journal of materials science & Technology 2024年第30期197卷 1-8页

作者： Huaicheng Xiang Yuheng Zhang Junqi Chen Yang Zhou Ying Tang Jinwu Chen Liang Fang Key Laboratory of Low-Dimensional Structural Physics and Application Education Department of Guangxi Zhuang Autonomous RegionCollege of Physics and Electronic Information EngineeringGuilin University of TechnologyGuilin541004China Guangxi Universities Key Laboratory of Non-Ferrous Metal Oxide Electronic Functional Materials and Devices Guangxi Key Laboratory of Optical and Electronic Materials and DevicesCollege of Materials Science and EngineeringGuilin University of TechnologyGuilin541004China School of Mechanical Engineering Guilin University of Aerospace TechnologyGuilin541004China

Bi_(1-x)Ho_(x)VO_(4)(0.1≤x≤0.9)ceramics were prepared via a solid-state reaction method,and all the ceram-ics could be well densified in the 920–980℃*** ceramics with 0.1≤x<0.4 were composed of both monoclinic scheelite(M)and tetragonal zircon(T)phases,and a single M phase could be obtained in the range of x≥*** measuredε_(r) decreased from 58.9(x=0.1)to 14.7(x=0.9),so do the calcu-lated values(ε_(r)(C−M)=34.3–12.1),and the main reason forε_(r)>ε_(r)(C−M)was the rattling of Ho^(3+)in the *** points with zeroτf appeared in Bi1–x Hox VO4(0≤x≤1)ceramics,and the best mi-crowave dielectric properties withε_(r)=16.6,Q×f=18,400 GHz(f=10.69 GHz),andτf=+3.29 ppm/℃were obtained in the Bi_(0.2)Ho_(0.8)VO_(4)*** change in temperature coefficient of ionic polarizability(τ_(αm))caused by the rattling effect of cations is the physical essence that affectsτ***,the rattling effect can be used as an effective mechanism to regulateτf in low-ε_(r) ***,there was no chemical reaction between Bi_(1-x)Ho_(x)VO_(4) and Ag electrode,which indicates potential applications in low-temperature co-fired ceramic(LTCC)technology.

关键词： Bi_(1–x)Ho_(x)VO_(4) Near-zeroτ_(f) Bond valence Rattling effect LTCC

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Bulk preparation of free-standing single-iron-atom catalysts directly as the air electrodes for high-performance zinc-air batteries

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Carbon Energy 2023年第5期5卷 57-66页

作者： Hong-Bo Zhang Yu Meng Hong Zhong Lili Zhang Shichao Ding Lingzhe Fang Tao Li Yi Mei Peng-Xiang Hou Chang Liu Scott P.Beckman Yuehe Lin Hui-Ming Cheng Jin-Cheng Li Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials Faculty of Chemical EngineeringKunming University of Science and TechnologyKunmingChina Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyangChina School of Mechanical and Materials Engineering Washington State UniversityPullmanWashingtonUSA Department of Chemistry and Biochemistry Northern Illinois UniversityDeKalbIllinoisUSA Argonne National Laboratory X-Ray Science DivisionLemontIllinoisUSA

The keen interest in fuel cells and metal-air batteries stimulates a great deal of research on the development of a cost-efficient and high-performance catalyst as an alternative to traditional Pt to boost the sluggish oxygen reduction reaction(ORR)at the ***,we report a facile and scalable strategy for the large-scale preparation of a free-standing and flexible porous atomically dispersed Fe-N-doped carbon microtube(FeSAC/PCMT)*** from its unique structure that greatly facilitates the catalytic kinetics,mass transport,and electron transfer,our FeSAC/PCMT electrode exhibits excellent performance with an ORR potential of 0.942 V at^(-3) mA cm^(-2).When the FeSAC/PCMT sponge was directly used as an oxygen electrode for liquid-state and flexible solid-state zinc-air batteries,high peak power densities of 183.1 and 58.0 mW cm^(-2) were respectively achieved,better than its powdery counterpart and commercial Pt/C *** and theoretical investigation results demonstrate that such ultrahigh ORR performance can be attributed to atomically dispersed Fe-N_(5) species in FeSAC/*** study presents a cost-effective and scalable strategy for the fabrication of highly efficient and flexible oxygen electrodes,provides a significant new insight into the catalytic mechanisms,and helps to realize significant advances in energy devices.

关键词： atomic Fe-N_(5)species free-standing electrode large-scale preparation oxygen reduction reaction zinc-air battery

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Metal-organic frameworks (MOFs) in aqueous batteries (ABs):unlocking potential through innovative materials design

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science China Chemistry 2025年

作者： Bo Han Erhai Hu Bei-Er Jia Ziyang Liu Shuen Tso Afriyanti Sumboja Ivandini T.Anggraningrum Anne Zulfia Syahrial Qingyu Yan SCARCE Laboratory Energy Research Institute NTU (ERIN) Nanyang Technological University School of Materials Science and Engineering Nanyang Technological University Material Science and Engineering Research Group Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Department of Chemistry University of Indonesia Metallurgical & Materials Engineering Department Fakultas Teknik Universitas Indonesia

Metal-organic frameworks (MOFs) represent a revolutionary class of materials in the field of energy storage,particularly for aqueous batteries (ABs).Distinguished by their large surface area,tuneable porosity,and adaptable chemical activity,MOFs offer significant advantages over conventional materials in battery *** article provides a thorough analysis of the crucial role that MOFs play in improving the efficiency of *** includes a concise review of the current research progress,emphasizing the fundamental processes by which MOFs enhance electrochemical ***,the review examines the synthesis and design strategies for the structure of MOFs to maximize ion transport,improve conductivity,and enhance *** structural advantages,chemical versatility,stability,durability and functionalization potential of MOFs are comprehensively ***,we explore the distinct advantages of MOFs in overcoming common challenges encountered in ABs,such as declining capacity,inadequate cycling stability,and limited energy *** paper also highlights the future research directions needed to fully harness their *** goal is to develop a fundamental understanding and stimulate further progress in the use of MOFs for advanced energy storage solutions.

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Investigation on mechanical behaviour of Al–Mg-Si alloy hybridized with calcined eggshell and TiO2 particulates

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Biomass Conversion and Biorefinery 2024年第18期14卷 22215-22226页

作者： Kumar, M. Saravana Akinwande, Abayomi Adewale Yang, Che-Hua Vignesh, M. Romanovski, Valentin Graduate Institute of Manufacturing Technology National Taipei University of Technology Taipei10608 Taiwan Department of Metallurgical and Materials Engineering Federal University of Technology Ondo State Akure Nigeria Department of Mechanical Engineering Amrita School of Engineering Amrita Vishwa Vidyapeetham Chennai India Center of Functional Nano-Ceramics National University of Science and Technology «MISIS» Lenin Av. 4 Moscow119049 Russia Department of Materials Science and Engineering University of Virginia 395 McCormick rd. Charlottesville22904 United States

The development of hybrid agro-metallic alloy and its composites has increased in the last few years to overcome the shortcomings of monolithic alloys. Using hard ceramic reinforcements would enhance the strength of the alloys and its composites during component building. One such ceramic reinforcement is the Titania (TiO2) powder, which possesses more strength than other ceramics materials, but the cost is a little higher. To overcome this, eco-friendly, calcined eggshell (CES) particulates are added to TiO2 reinforcement to enhance the strength of the hybrid composite at a reduced cost. The main novelty of the present study is the employment of CES and TiO2 particulates in the Al 6061 matrix during the development of hybrid Al 6061 composites. This increases the strength of the fabricated composites at a reduced cost and results in the development of eco-friendly agro-metallic composites. Samples were produced individually in groups with varying proportions of CES at 3, 6, 9 and 12 wt% and combined with fixed proportions of TiO2 at 3, 6, 9 and 12 wt% individually with groups such as A (3 wt% of TiO2 + 3, 6, 9 and 12 wt% of CES), B, C and C and D, respectively. Microstructural characterization through FESEM and phase identification through XRD analysis are conducted to justify the uniform dispersion of reinforcements in the matrix. Developed samples were subjected to tensile, flexural and hardness tests, and the results proved that the mechanical properties of composites were enhanced when combining 3, 6, 9 and 12 wt% CES with 3 and 6 wt% of TiO2 compared with unreinforced Al 6061. The enhancement is linked to the uniform dispersion of the particles and good interaction between the particles. However, the 3, 6, 9 and 12 wt% CES with 9 and 12 wt% of TiO2 yielded inferior strength performance relative to the reference mix due to particle clustering and agglomeration formation. This acts as a yielding point for stress concentration. Therefore, it was concluded that a

关键词： Titanium dioxide

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