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Optimizing the overall performance of Cu–Ni–Si alloy via controllingnanometer-lamellar discontinuous precipitation structure

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International Journal of Minerals,Metallurgy and Materials 2025年第4期32卷 915-924页

作者： Jinyu Liang Guoliang Xie Feixiang Liu Wenli Xue Rui Wang Xinhua Liu Key Laboratory for Advanced Materials Processing(MOE) Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Institute of Materials Genome Engineering Henan Academy of SciencesZhengzhou 450046China

Simultaneously achieving high strength and high electrical conductivity in Cu–Ni–Si alloys pose a significant challenge, which greatly constrains its applications in the electronics industry. This paper offers a new pathway to improve properties, by preparation of nanometer lamellar discontinuous precipitates(DPs) arranged with the approximate same direction through a combination of deformationaging and cold rolling process. The strengthening effect is primarily attributed to nanometer-lamellar DPs strengthening and dislocation strengthening mechanism. The accumulation of dislocations at the interface between nanometer lamellar DPs and matrix during cold deformation process can results in the decrease of dislocation density inside the matrix grains, leading to the acceptably slight reduction of electrical conductivity during cold rolling. The alloy exhibits an electrical conductivity of 45.32%IACS(international annealed copper standard, IACS), a tensile strength of 882.67 MPa, and a yield strength of 811.33 MPa by this method. This study can provide a guidance for the composition and microstructure design of a Cu–Ni–Si alloy in the future, by controlling the morphology and distribution of DPs.

关键词： Cu–Ni–Si alloys discontinuous precipitates nanometer-lamellar strengthening dislocation strengthening

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Impacts of near-M_(s)austempering treatment on microstructure evolution and bainitic transformation kinetics of a medium Mn steel

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Journal of Iron and Steel Research International 2025年第1期32卷 249-259页

作者： Yong-gang Yang Xin-yue Liu Rui-zhi Li Yu-lai Chen Hong-xiang Wu Guo-min Sun Zhen-li Mi National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing 100083China Technology Center Ningbo Iron&Steel Co.Ltd.Ningbo 315800ZhejiangChina

The microstructure evolution and bainitic transformation of an Fe-0.19C-4.03Mn-1.48Si steel subjected to near-M_(s)austempering treatment were systematically investigated by combining dilatometer,X-ray diffraction,and electron *** additional austempering treatments with isothermal temperatures above M_(s)were used as *** show that the incubation period for the bainitic transformation occurs when the medium Mn steel is treated with the austempering temperature above M_(s).However,when subjected to near-M_(s)isothermal treatment,the medium Mn steel does not show an incubation period and has the fastest bainitic transformation ***,the largest volume fraction of bainite with a value of 74.7%is obtained on the condition of near-M_(s)austempering treatment after cooling to room *** and microstructure evolution analysis indicates that the elimination of the incubation period and the fastest rate of bainitic transformation are related to the preformed *** advent of preformed martensite allows the specimen to generate more bainite in a limited *** bainitic ferrite nucleation at austenite grain boundaries and through autocatalysis at ferrite/austenite interfaces,a model is established to understand the kinetics of bainite formation and it can describe the nucleation rate of bainitic transformation well when compared to the experimental results.

关键词： Medium manganese steel Bainitic transformation Microstructure Near-M_(s)austempering Transformation modeling

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The Characteristics of Recycled Concrete Powder and Its Influences on the Properties of Cement-based Materials

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Journal of Wuhan University of technology(Materials Science) 2025年第2期40卷 496-508页

作者： XUE Cuizhen WANG Zhe QIAO Hongxia SU Li FENG Qiong School of Civil Engineering Lanzhou University of TechnologyLanzhou 730050China Gansu Advanced Civil Engineering Materials Engineering Research Center Lanzhou 730050China

To guarantee the efficient and high-value reutilization of waste concrete from construction waste,the waste concrete was mechanically ground,and three degrees of fineness recycled concrete powder(RCP)were obtained by different grinding *** analyzing the particle characteristics of RCP with different fineness,the filling-densification effect of cement-RCP cementitious material system was quantitatively investigated based on Andreasen,Fuller,and Aim-Goff *** addition,the macroscopic mechanical properties of cement paste mixed with RCP were studied,and the influencing mechanisms of RCP on the microstructure of cement paste was *** research results show that the particle fineness of RCP after grinding is smaller than that of *** the RCP replaces 0%to 20%cement,the packing density based on the Aim-Goff model increases with the increase of RCP content,whereas the macro-mechanical properties first improve and then degrade with the increase of RCP *** results show that at 5%RCP content,beneficial hydration products such as C-S-H and beneficial pore increase in cement-RCP paste;while at>15%content,beneficial products decrease and harmful substances such as Ca(OH)_(2)and harmful pore *** research findings suggest that the incorporation of RCP can make the cementitious system denser,and the appropriate RCP content can improve the macro-and microscopic properties of cement-based materials.

关键词： recycled concrete powder(RCP) aim-Goff models filling-densification effect mechanical properties microstructure packing density

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Bottlebrush Random Copolymers at Oil-Oil Interfaces

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Chinese Journal of Chemistry 2025年第2期43卷 139-145页

作者： Yaxin Wang Yunhui Wen Yuzheng Luo Shuailong Li Jiaqiu Luo Shaowei Shi State Key Laboratory of Chemical Resource Engineering Beijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing100029 China

Oil-in-oil nonaqueous emulsions are of great interest for developing emulsion-templated polymers and encapsulation systems that are incompatible with water-sensitive ***-made amphiphilic block copolymers are by far the most efficient stabilizers for oil-in-oil emulsions while less attention is given to copolymers with more complex ***,we report the stabilization of DMSO-silicone oil interface by bottlebrush random copolymers(BRCPs)containing norbornene backbones with densely grafted poly(methyl methacrylate)(PMMA)and polystyrene(PS)side *** assembly kinetics of BRCPs at the DMSO-silicone oil interface can be divided into three processes,including diffusion,reconfiguration and reorganization,and can be varied by tuning the degree of polymerization of the backbone(NB).Due to the high efficiency of BRCPs in reducing the interfacial tension,when using BRCPs as stabilizers,stable silicone oil-in-DMSO traditional emulsions and high internal phase emulsions(HIPEs)can be successfully obtained,while no stable emulsions can be achieved with linear PMMA-b-PS serving as the *** study,for the first time,underscores the great potential of amphiphilic bottlebrush copolymers in preparing oil-in-oil *** the advances in polymerization strategy,a broad variety of amphiphilic bottlebrush copolymers are expected to be synthesized and applied in the stabilization of nonaqueous biphasic systems.

关键词： Bottlebrush copolymers Oil-oil interfaces|Emulsions Surfactants Assembly dynamics

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Multi-Scale Time Series Segmentation Network Based on Eddy Current Testing for Detecting Surface Metal Defects

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IEEE/CAA Journal of Automatica Sinica 2025年第3期12卷 528-538页

作者： Xiaorui Li Xiaojuan Ban Haoran Qiao Zhaolin Yuan Hong-Ning Dai Chao Yao Yu Guo Mohammad S.Obaidat George Q.Huang the School of Intelligence Science and Technology University of Science and Technology Beijing the Beijing Advanced Innovation Center for Materials Genome Engineering the Key Laboratory of Intelligent Bionic Unmanned Systems and the Institute of Materials Intelligent Technology Liaoning Academy of Materials IEEE the Department of Computer Science Hong Kong Baptist University the School of Computer and Communication Engineering Key Laboratory of Advanced Materials and Devices for Post-Moore Chips Ministry of Education University of Science and Technology Beijing the Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology Beijing the School of Computer and Communication Engineering University of Science and Technology Beijing the King Abdullah Ⅱ School of Information Technology The University of Jordan the Department of Computational Intelligence the School of Computing SRM University the School of Engineering The Amity University The Hong Kong Polytechnic University

In high-risk industrial environments like nuclear power plants, precise defect identification and localization are essential for maintaining production stability and safety. However, the complexity of such a harsh environment leads to significant variations in the shape and size of the defects. To address this challenge, we propose the multivariate time series segmentation network(MSSN), which adopts a multiscale convolutional network with multi-stage and depth-separable convolutions for efficient feature extraction through variable-length templates. To tackle the classification difficulty caused by structural signal variance, MSSN employs logarithmic normalization to adjust instance distributions. Furthermore, it integrates classification with smoothing loss functions to accurately identify defect segments amid similar structural and defect signal subsequences. Our algorithm evaluated on both the Mackey-Glass dataset and industrial dataset achieves over 95% localization and demonstrates the capture capability on the synthetic dataset. In a nuclear plant's heat transfer tube dataset, it captures 90% of defect instances with75% middle localization F1 score.

关键词： Eddy current testing nondestructive testing semantic segmentation time series analysis

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Towards the application of mainstream low-carbon anammox wastewater treatment technologies:strategies,innovations,and prospects

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Frontiers of Chemical Science and engineering 2025年第2期19卷 1-19页

作者： Wentao Pan Hong Liu Yongzhi Chen Qi Wang Yunxia Wang Li Zhang Yongzhen Peng School of Environmental and Municipal Engineering Lanzhou Jiaotong UniversityLanzhou 730070China Technical Center of Sewage Treatment Industry in Gansu Province Lanzhou 730070China National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology Engineering Research Center of BeijingBeijing University of TechnologyBeijing 100124China

Enhancing nitrogen removal is a very active branch in municipal wastewater treatment research,toward this end,anammox technology is a sustainable *** review systematically outlines the strategies employed to enhance mainstream anammox performance,including nitrite accumulation and microbial enrichment based on partial nitrification coupled anammox and partial denitrification coupled anammox,developed to address the challenges of low ammonium content in wastewater,nitrate accumulation in the effluent,and the influence of organic *** characteristics and advantages of novel anammox-coupled processes,including partial nitrification and partial denitrification coupled anammox,endogenous partial denitrification coupled anammox,and denitrifying anaerobic methane oxic coupled anammox are also comprehensively discussed;these aim to ensure the highly efficient and stable operation of anammox under diverse wastewater conditions by constructing a composite biological nitrogen removal system based on anammox,supplemented by nitrification-denitrification and other ***,a novel anammox application route including mainstream partial denitrification/anammox and absorption-biodegradation as well as sidestream partial nitrification/anammox is proposed,and its application pathway in conceptual wastewater treatment plants is outlined,aiming to foster the development of cost-effective,efficient,and energy-saving advanced wastewater treatment ***,prospects are presented that indicate the gaps in contemporary research and potential future research ***,this review provides a reference for treating municipal wastewater with anammox and sheds new light on related strategies and nitrogen removal mechanisms.

关键词： mainstream anammox municipal wastewater treatment nitrogen removal operation strategy process innovation

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Investigating the compatibility of kesterite and zinc charge transport layers with inorganic germanium perovskite solar cells

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Optical and Quantum Electronics 2025年第1期57卷 1-35页

作者： Khan, Asfandyar Ali Noman, Muhammad Jan, Shayan Tariq U.S.-Pakistan Center for Advanced Studies in Energy University of Engineering and Technology Peshawar Pakistan Department of Electrical Engineering University of Engineering and Technology Mardan Pakistan

The rising demand for environmentally sustainable energy solutions has driven significant interest in lead-free inorganic perovskite solar cells as alternatives to the toxic lead-based counterparts. Despite promising advances, challenges remain in optimizing the efficiency of lead-free PSCs for practical applications. This study investigates cesium germanium tri-iodide (CsGeI₃) as a lead-free perovskite absorber layer, with four zinc-based electron transport layers and five kesterite quaternary-based hole transport layers. Using the SCAPS-1D simulation software, 20 unique device structures were modeled, systematically varying the charge transport layers to identify optimal configurations. Zinc-based electron transport layers were chosen for their large band gaps and high optical transmittance, while kesterite-based hole transport layers were selected due to their high absorption coefficients, tunable band gaps, abundance, and non-toxicity. A systematic methodology is adopted to analyze the effect of the charge transport materials on the absorption, quantum efficiency, energy band alignment, electric field intensity, recombination rate, carrier density, thickness, doping concentration, temperature, reflection and interface defect densities of the PSC in detail. Notably, the CMTS/CsGeI₃/CdZnS structure achieved the highest power conversion efficiency of 25.78%, with a short-circuit current density of 24.49 mA/cm2, a fill factor of 86.39%, and an open-circuit voltage of 1.22 V. These findings suggest that carefully selected charge transport layer combinations can significantly enhance the efficiency of lead-free CsGeI₃-based PSCs. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2025.

关键词： Perovskite

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Microstructure and mechanical properties of nickel-based wrought superalloys under thermal-mechanical coupling: A review with Inconel 718,625 as main cases

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Progress in Natural Science:Materials International 2025年第1期35卷 65-82页

作者： Kai Cao Jiangkun Fan Xudong Liu Jianing Zhang Dian Jiao Yuelin Song Fulong Chen Jun Wang Bin Tang Hongchao Kou Jinshan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University National & Local Joint Engineering Research Center for Precision Thermoforming Technology of Advanced Metal Materials Chongqing Innovation Center Northwestern Polytechnical University AVIC Manufacturing Technology Institute

The typical processing and in-service behaviors of nickel-based wrought superalloys involve complex thermal-mechanical coupling effects, including elastic and plastic deformations, phase transformations, and other microstructural evolutions, directly impacting the mechanical properties. This review article provides an in-depth discussion on the microstructural evolution of these superalloys under thermal-mechanical coupling, focusing on two key aspects: the thermoplastic deformation behavior, and the phase transformation behavior in temperature/stress coupled field. The dynamic recrystallization(DRX) behavior during hot deformation and its improvement strategies are discussed in detail. The differences in phase precipitation behavior under conventional heat treatment and thermal-mechanical coupling conditions are compared. The mechanisms driving changes in precipitate characteristics are explored, enabling precise control of precipitates. This article further investigates the intricate relationship between the mechanical properties of nickel-based wrought superalloys and the characteristics of their precipitates, offering guidance for current and future optimizations. It also delves into the latest research advancements in precisely tailoring the precipitates through thermal-mechanical coupling methods to optimize these mechanical properties. Finally, it outlines several promising future research directions in this field.

关键词： Dynamic recrystallization

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Elemental segregation, microstructure, and mechanical properties of TMCP-treated high-manganese wear-resistant steel

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Journal of Iron and Steel Research International 2025年第3期32卷 783-798页

作者： Yang He Jian-hua Liu Guan-yong Huang Hao Xu Ning Liu Jiang-hua Qi National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing100083China Technology Center of Hunan Valin Lianyuan Iron and Steel Co. Ltd.Loudi417009HunanChina

The elemental segregation,microstructure,and mechanical properties of thermo-mechanical control process(TMCP)treated high-manganese wear-resistant steel(HMWS)were experimentally ***,the initial elemental segregation in the continuous casting slab of HMWS was characterized using the original position *** results showed that the elemental segregation predominantly occurred near the quarter and the center regions of the *** homogenization of manganese(Mn)in the slab was not as obvious as that of other elements after the heating ***,a series of hot-rolling tests were carried out on HMWS slab samples under different TMCP conditions,and the elemental segregation and microstructure of the TMCP-treated HMWS were investigated by microscopic analysis *** findings demonstrated that the segregations of carbon and silicon were effectively eliminated after the TMCP treatment,while Mn segregation presented a band-shaped arrangement and could be reduced at lower finishing rolling *** matrix phase of HMWS remained austenite regardless of the TMCP conditions,and the average size of austenite grains increased with the increasing finishing rolling *** particles were observed to form within austenite grains and even along grain boundaries at higher coiling ***,the mechanical tests were performed on the TMCP-treated HMWS at room *** mechanical properties including tensile stress,yield stress,Charpy impact energy,and microhardness were discussed considering the effects of Mn segregation band,microstructure,and carbide precipitation.

关键词： High-manganese wear-resistant steel Thermo-mechanical control process Manganese segregation Microstructure Mechanical property

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Mechanical and electrochemical properties of(MoNbTaTiZr)1-xNx high-entropy nitride coatings

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材料科学技术（英文版） 2025年第5期208卷 78-91页

作者： Wei Yang Jianxiao Shen Zhenyu Wang Guanshui Ma Peiling Ke Aiying Wang Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

High-entropy materials possess high hardness and strong wear resistance,yet the key bottleneck for their practical applications is the poor corrosion resistance in harsh *** this work,the high-entropy nitride(HEN)coatings of(MoNbTaTiZr)1-xNx(x=0-0.47)were fabricated using a hybrid di-rect current magnetron sputtering *** research focus was dedicated to the effect of nitrogen content on the microstructure,mechanical and electrochemical *** results showed that the as-deposited coatings exhibited a typical body-centered cubic(BCC)structure without nitrogen,while the amorphous matrix with face-centered cubic(FCC)nanocrystalline grain was observed at x=*** increasing x in the range of 0.35-0.47 caused the appearance of polycrystalline FCC phase in *** with the MoNbTaTiZr metallic coating,the coating containing nitrogen favored the high hard-ness around 13.7-32.4 GPa,accompanied by excellent tolerance both against elastic and plastic ***,such N-containing coatings yielded a low corrosion current density of about 10-8-10-7 A/cm2 and high electrochemical impedance of 106 Ω cm2 in 3.5 wt.％NaCl solution,indicating the supe-rior corrosion *** reason for the enhanced electrochemical behavior could be ascribed to the spontaneous formation of protective passive layers over the coating surface,which consisted of the domi-nated multi-elemental oxides in chemical ***,noted that the(MoNbTaTiZr)0.83N0.17 coat-ing displayed the highest hardness of 32.4±2.6 GPa and H/E ratio at 0.09,together with remarkable cor-rosion resistance,proposing the strongest capability for harsh-environmental applications required both good anti-wear and anti-corrosion performance.

关键词： High-entropy nitride Magnetron sputtering Microstructure Mechanical property Corrosion behavior

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