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Accelerating homogenization kinetics and enhancing hot-workability of as-cast nickel-based superalloy via prior hot-deformation

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Journal of Iron and Steel Research International 2025年第1期32卷 215-226页

作者： Jia-jun Chen Yang Zhou Hao-ran Han Xian-guang Zhang Goro Miyamoto Ping-mei Tang Dong-ping Xiao Jian-hui Fu Peng Shi Yi-wu Pei Jian Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Chengdu Advanced Metal Materials Industrial Technology Institute Co. Ltd.Chengdu 610300SichuanChina Institute for Materials Research Tohoku UniversitySendai 980-8577Aoba-KuJapan

Enhancing homogenization efficiency and hot-workability is the key issue for wrought superalloys in the industry.A novel approach for simultaneous accelerating the homogenization kinetics and improving hot-workability via a simple way of prior hot-deformation was proposed,which was not widely accepted for wrought *** homogenization efficiency is increased by 40%-70%via performing 10%-20%prior *** theoretical and experimental analyses revealed that the increment in homogenization efficiency is mainly attributed to the decrease in interdendritic-segregation spacing,and thus the necessary diffusion distance,rather than that of *** addition,dynamic and static recrystallizations occurred during the prior hot-deformation and diffusion-annealing processes,and the grains were significantly refined even after the ***,the size of the precipitates was refined as *** enhanced the hot-workability of the homogenized ingot for the subsequent cogging process.

关键词： Nickel-based superalloy Homogenization kinetics Prior hot-deformation Grain size Hot workability

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A review on microstructure design, processing, and strengthening mechanism of high-strength titanium alloys

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Progress in Natural Science: Materials International 2025年第2期35卷 258-277页

作者： Xu, Guanghua Zhao, Xinbao Xia, Wanshun Yue, Quanzhao Zheng, Zheshuai Gu, Yuefeng Zhang, Ze Institute of Superalloys Science and Technology School of Materials Science and Engineering Zhejiang University Hangzhou310027 China State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and Engineering Zhejiang University Hangzhou310027 China

High-strength titanium alloys (HS-TAs), particularly those with an ultimate tensile strength exceeding 1100 MPa, play a crucial role in aerospace and other advanced engineering fields. However, faced with the continuously evolving industrial landscape and increasingly complex application environments, research and development of HS-TAs are encountering unprecedented challenges. This paper provides a review of significant research advancements in the field of HS-TAs in recent years, with a special focus on the latest achievements in microstructural design, processing technology, and strengthening mechanisms. Initially, the paper offers an integrated assessment of how alloying and non-alloying elements precisely control the distribution and morphology of α and β phases at the microscale, and their impact on the mechanical properties of titanium alloys. Subsequently, from the perspectives of plastic deformation and microstructure regulation, the paper delves into the contributions of various mechanisms such as solid-solution strengthening, grain boundary strengthening, and precipitation strengthening, to the enhancement of high-strength titanium alloy performance. Additionally, the article compares and analyzes the effects of different heat treatments and mechanical processing techniques on the microstructure and overall performance of HS-TAs. Finally, the paper presents future research directions and potential applications of these alloys in some key areas, aiming to provide a theoretical foundation and practical guidance for the development of advanced structural materials with high strength and optimized ductility. © 2025 Chinese Materials Research Society

关键词： Titanium alloys

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Fairness-Aware Budgeted Edge Server Placement for Connected Autonomous Vehicles

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IEEE Transactions on Mobile Computing 2025年第6期24卷 4762-4776页

作者： Wu, Jintao Xu, Xiaolong Cui, Guangming Zhang, Yiwen Qi, Lianyong Dou, Wanchun Cai, Zhipeng Nanjing University of Information Science & Technology Jiangsu Province Engineering Research Center of Advanced Computing and Intelligent Services School of Software Nanjing210044 China Jilin University Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Changchun130012 China Nanjing University of Information Science & Technology Jiangsu Province Engineering Research Center of Advanced Computing and Intelligent Services School of Software China Nanjing University State Key Laboratory for Novel Software Technology China Anhui University School of Computer Science and Technology Anhui230031 China College of Computer Science and Technology Qingdao266580 China Nanjing University State Key Laboratory for Novel Software Technology Nanjing210023 China Georgia State University Department of Computer Science United States

Mobile edge computing (MEC) considerably enhances the capabilities and performance of connected autonomous vehicles (CAVs) by deploying edge servers (ESs) on roadside units (RSUs) near CAVs, thereby ensuring low-latency services. Given the constrained and costly nature of ES resources (computing, storage, and bandwidth), equitable ES utilization is critical for CAV operations. However, fairness considerations are often overlooked in current budgeted edge server placement (ESP) strategies, potentially worsening resource imbalances and compromising user experience. This paper investigates the fairness-aware budgeted edge server placement (FESP) problem within RSUs, proving its NP-hardness. To address FESP, we first propose FESP-O, an integer programming-based optimal approach for small-scale problems, followed by FESP-APX, an approximation approach for large-scale scenarios that provides near-optimal solutions. We analyze the time complexity and approximation ratio of our proposed algorithms and validate their efficacy through experiments on real-world datasets. Extensive experimental results demonstrate significant performance improvements over baseline and state-of-the-art methods, indicating practical suitability and efficiency. © 2002-2012 IEEE.

关键词： Integer linear programming

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Role of NH4+/H3O+ on the Na+ storage performance for aqueous-synthesized Na3(VOPO4)2F cathode materials and their removal

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Journal of Energy Chemistry 2025年 107卷 612-621页

作者： Yang, Xiaoping Zhang, Yibo Wang, Xianshu Li, Wenjiao Yin, Xiangshao Yao, Jun Jiang, Weihong Duan, Jianguo Zhang, Yingjie Xu, Lin Wang, Ding National and Local Joint Engineering Research Center of Lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan Province Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Yunnan Kunming650093 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Hubei Wuhan430070 China Hubei Xiangyang441000 China Co. Ltd. High Technology Industrial Development Zone Henan Zhengzhou450001 China

The aqueous preparation of Na3(VOPO4)2F cathode material with low cost and good structural stability has attracted extensive attention for advancing sodium-ion batteries (SIBs). However, the inclusive heterogeneous cations incorporated into the material lattice, dominated by coordination chemistry, are always overlooked. Herein, the embroiled NH4+/H3O+ cations in the Na3(VOPO4)2F lattice have been first disclosed during aqueous co-precipitation. It involves the electrostatic interactions between hydrogen protons (NH4+/H3O+) and electronegative oxygen atoms (V=O and V–O–P groups), which induces the terrible Na+-storage performance, as demonstrated by multiple characterizations. Followingly, the very-facile operation, i.e. heat treatment, has been raised to remove NH4+/H3O+ cations and then achieved high-performance Na3(VOPO4)2F. Therefore, the Na3(VOPO4)2F||Na cell contributes to the significantly improved discharge capacity (129.7 mAh g−1) and voltage plateau from 3.63 to 3.87 V (vs. Na/Na+) at 0.2 C. The ultrahigh capacity retentions of 93.7% and 76.7% after 1000 and 3500 cycles at 1 and 20 C rates under 25 °C are harvested, respectively, as well as high/low-temperature performances and rate capability. Eventually, the as-assembled Na3(VOPO4)2F||hard carbon full-cell delivers excellent long-term cycling stability over 1000 cycles with 97.5% retention at 3 C. These emphasize the high-efficacy synthesis of Na3(VOPO4)2F and provide insights into the aqueous co-precipitation for the development of materials used in SIBs. © 2025 Science Press

关键词： Sodium-ion batteries

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Machine-Learning-Assisted Compositional Design of Refractory High-Entropy Alloys with Optimal Strength and Ductility

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engineering 2025年第3期46卷 214-223页

作者： Cheng Wen Yan Zhang Changxin Wang Haiyou Huang Yuan Wu Turab Lookman Yanjing Su School of Mechanical and Power Engineering Guangdong Ocean UniversityZhanjiang 529500China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Corrosion and Protection Center University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China AiMaterials Research LLC Santa FeNM 87501USA

Designing refractory high-entropy alloys(RHEAs)for high-temperature(HT)applications is an outstanding challenge given the vast possible composition space,which contains billions of candidates,and the need to optimize across multiple ***,we present an approach that accelerates the discovery of RHEA compositions with superior strength and ductility by integrating machine learning(ML),genetic search,cluster analysis,and experimental *** iteratively synthesize and characterize 24 predicted compositions after six feedback *** compositions show outstanding combinations of HT yield strength and room-temperature(RT)ductility spanning the ranges of 714–1061 MPa and 17.2%–50.0%fracture strain,*** identify an attractive alloy system,ZrNbMoHfTa,particularly the composition Zr_(0.13)Nb_(0.27)Mo_(0.26)Hf_(0.13)Ta_(0.21),which demonstrates a yield approaching 940 MPa at 1200℃ and favorable RT ductility with 17.2%fracture *** high yield strength at 1200℃ exceeds that reported for RHEAs,with 1200℃ exceeding the service temperature limit for nickel(Ni)-based *** ML-based approach makes it possible to rapidly optimize multiple properties for materials design,thus overcoming the common problems of limited data and a vast composition space in complex materials systems while satisfying multiple objectives.

关键词： Machine learning Refractory high-entropy alloys Multi-objective optimization Strength-ductility design

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state-of-art of in situ observations of inclusion agglomeration at steel/Ar and steel/slag interfaces:a review of recent development on experimental and theoretical studies

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Journal of Iron and Steel Research International 2025年第2期32卷 315-333页

作者： Yi Wang Jian-xun Fu Deepoo Kumar Qiang Wang Hong-liang Yang Wang-zhong Mu Center for Advanced Solidification Technology(CAST) School of Materials Science and EngineeringShanghai UniversityShanghai200444China Department of Materials Science and Engineering KTH Royal Institute of TechnologyStockholm10044Sweden Engineering Materials Division of Materials ScienceDepartment of Engineering Science and MathematicsLuleåUniversity of TechnologyLuleå97187Sweden Department of Metallurgical Engineering and Materials Science IIT BombayPowaiMumbaiIndia Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang110819LiaoningChina ABB Metallurgy Västerås72136Sweden

Cleanliness control of advanced steels is of vital importance for quality control of the *** order to understand and control the inclusion removal during refining process in molten steel,its motion behaviors at the multiple steel/gas/slag interfaces have attracted the attention much of metallurgical *** recent development of the agglomeration of non-metallic inclusions at the steel/Ar and steel/slag interfaces has been summarized,and both the experimental as well as theoretical works have been *** terms of in situ observation of high-temperature interfacial phenomena in the molten steel,researchers utilized high-temperature confocal laser scanning microscopy to observe the movement of more types of inclusions at the interface,i.e.,the investigated inclusion is no longer limited to Al_(2)O_(3)-based inclusions but moves forward to rare earth oxides,MgO-based oxides,*** terms of theoretical models,especially the model of inclusions at the steel/slag interface,the recent development has overcome the limitations of the assumptions of Kralchevsky-Paunov model and verified the possible errors caused by the model assumptions by combining the water model and the physical *** but not least,the future work in this topic has been suggested,which could be in combination of thermal physical properties of steels and slag,as well as utilize the artificial intelligence-based methodology to implement a comprehensive inclusion motion behaviors during a comprehensive metallurgical process.

关键词： Inclusion movementSteel Ar interfaceSteel slag interfaceIn situ observation

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Hydrogen radical-based prodrug photoactivation by modulating bond dissociation energy of a phenolic photosensitizer

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Science China Chemistry 2025年 1-14页

作者： Sun, Jian Peng, Jinlei Zhou, Junwei Zhang, Xiaoran Zhu, Chuanwei Wang, Rong Feng, Fude Wang, Shu Key Laboratory of High Performance Polymer Material and Technology of Ministry of Education Department of Polymer Science & Engineering School of Chemistry & Chemical Engineering Nanjing University Nanjing210023 China Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing100190 China State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials Chemistry and Biomedicine Innovation Center School of Chemistry and Chemical Engineering Nanjing University Nanjing210023 China

Phenols are extremely difficult to release the hydrogen radical (H•) due to the disfavored O–H bond dissociation energy (BDE) and undergo O–H homolysis under strong ultraviolet-C (UVC) light. In this work, we provided a method to modulate the O–H BDE of phenols by π-conjugation to electron-donating heteroaromatics. Calculations on a phenol-cored photosensitizer (BTP-1) revealed drastic declines of O–H BDE (80.5 vs. 28.1 kcal mol−1) by comparing the ground state (S0) and triplet excited state (T1). Consequently, BTP-1 was sensitive to visible light and generated H• after O–H scission. With glutathione (GSH) serving as an ultimate H• donor, the BTP-1-based photosystem was efficient in catalyzing H• generation under physiological conditions. This kind of hydrogen atom-based photochemistry is distinct from traditional type I/II photosensitizing pathways that are electron or energy transfer-based. We applied the photosystem to solve the obstacle in hypoxia-activated prodrugs (HAPs) that face a dilemma with the heterogeneously hypoxic level of tumors. In vitro studies demonstrated that the photosystem boosted the chemotherapy performance of TH-302 (a representative HAP) under moderate hypoxia. With the capability to target redox bonds in HAPs and good compatibility with near-infrared two-photon laser, the photosystem is promising for cancer precision therapy. © Science China Press 2025.

关键词： Photodissociation

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Bridgman growth and characterization of langanite(La_3Ga_(5.5)Nb_(0.5)O_(14),LGN)single crystal

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Journal of Rare Earths 2025年第3期43卷 584-590,I0006页

作者： Chengkai Ren Libin Yin Shuai Wang Weirong Chen Sheng Wang Kainan Xiong Xiaoniu Tu Ningzhong Bao Yanqing Zheng Jun Chen Erwei Shi Institute of Ceramics Chinese Academy of SciencesShanghai201800 China State Key Laboratory of Material-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing210009China The State Key Discipline Laboratory of Wide Bandgap Semiconductor Technology School of MicroelectronicsXidian UniversityXi'an710071China College of Materials Science and Chemical Engineering Ningbo UniversityNingbo315211China Beijing Advanced Innovation Center for Materials Genome Engineering Department of Physical ChemistryUniversity of Science and Technology BeijingBeijing100083China Hainan University Haikou570228China

As a promising optical and piezoelectric crystal,efficient growth of LGN single crystal is crucial for its practical ***,a langanite(La_(3)Ga_(5.5)Nb_(0.5)O_(14),LGN)crystal with high quality was successfully grown by the Bridgman method along the Z *** order to prepare high-purity polycrystalline precursors for LGN crystal growth,the sintering conditions of LGN polycrystalline precursors were studied in *** melting point of LGN was also measured to provide a reference for the crystal growth *** the[001]oriented wafer,the full width at half maximum(EWHM)value of the nigh-resolution X-ray diffraction(HRXRD)analysis is 38.52",demonstrating that the LGN crystal exhibits excellent crystalline *** addition,we also measured the thermal properties and transmission spectrum of the as-grown LGN *** is found that the absorption peak at 1.85μm of the LGN crystal grown in air using the Bridgman method disappears compared with previous reports(grown in N_(2+)(1-3)vol%O_(2)atmosphere),which is attributed to the oxygen-enriched growth *** phenomenon also occurs in other LGS-type disordered *** is believed that these findings may expand the potential applications of LGS series crystals at 1.85μm.

关键词： Langanite Rare earths Bridgman method Oxygen-enriched growth Optical materials

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Spherical Magnetic Fe-Alginate Microgels Fabricated by Droplet-Microfluidics Combining with an External Crosslinking Approach and the Study of Their pH Dependent Fe^(3+) Release Behaviors

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Chinese Journal of Polymer Science 2025年第2期43卷 289-302页

作者： Jie Chen Run-Yu Yu ai-Qi Wang Zhe-Yu Zhang Arezoo Ardekani Yuan-Du Hu Department of Materials Science and Engineering School of Physics Science and EngineeringBeijing Jiaotong UniversityBeijing100044China Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing South China University of TechnologyGuangzhou510641China State Key Laboratory of Molecular Engineering of Polymers Fudan UniversityShanghai200438China Department of Mathematics School of Mechanical EngineeringPurdue University585 Purdue MallWest LafayetteIN47907-2088USA

Due to the rapid development and potential applications of iron(Ⅲ)-alginate(Fe-Alg)microgels in biomedical as well as environmental engineering,this study explores the preparation and characterization of spherical Fe-Alg microgels using droplet microfluidics combined with an external ionic crosslinking *** study focused on the role of Fe^(3+)and examined its effects on the physical/chemical properties of microgels under different ionic conditions and reduced or oxidized *** pH-dependent release behavior of Fe^(3+)from these microgels demonstrates their potential biomedical and environmental ***,the microgels can exhibit magnetism simply by utilizing in situ oxidation,which can be further used for targeted drug delivery and magnetic separation technologies.

关键词： Fe-alginate microgels Droplet microfluidics In situ oxidation Magnetism

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Effects of Zn(Ⅱ)on the simultaneous nitrification and denitrification(SND)process:Performance and microbial community

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Chinese Journal of Chemical engineering 2025年第1期77卷 301-309页

作者： Hu Chen Ying Wang Yulan Zou Yongkang Lv China Institute for Radiation Protection Taiyuan 030006China The State Key Laboratory of Clean and Efficient Utilization of Coal-Based Energy Taiyuan University of TechnologyTaiyuan 030024China College of Environmental Science and Engineering Taiyuan University of TechnologyTaiyuan 030600China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030001China

Simultaneous nitrification and denitrification(SND)is considered an attractive alternative to traditionally biological nitrogen removal *** the effects of heavy metals on the SND process is essential for *** this study,the responses of SND performance to Zn(Ⅱ)exposure were investigated in a biofilm *** results indicated that Zn(Ⅱ)at low concentration(≤2 mg·L^(-1))had negligible effects on the removal of nitrogen and COD in the SND process compared to that without Zn(Ⅱ),while the removal of ammonium and COD was strongly inhibited with an increasing in the concentration of Zn(Ⅱ)at 5 or 10 mg·L^(-1).Large amounts of extracellular polymeric substance(EPS),especially protein(PN),were secreted to protect microorganisms from the increasing Zn(Ⅱ)***-throughput sequencing analysis indicated that Zn(Ⅱ)exposure could significantly reduce the microbial diversity and change the structure of microbial *** RDA analysis further confirmed that Azoarcus-Thauera-cluster was the dominant genus in response to low exposure of Zn(Ⅱ)from 1 to 2 mg·L^(-1),while the genus Klebsiella and Enterobacter indicated their adaptability to the presence of elevated Zn(Ⅱ).According to PICRUSt,the abundance of key genes encoding ammonia monooxygenase(EC:1.14.99.39)was obviously reduced after exposure to Zn(Ⅱ),suggesting that the influence of Zn(Ⅱ)on nitrification was greater than that of denitrification,leading to a decrease in ammonium removal of SND *** study provides a theoretical foundation for understanding the influence of Zn(Ⅱ)on the SND process in a biofilm system,which should be a source of great concern.

关键词： Simultaneous nitrification and denitrification Zn(Ⅱ) Nitrogen removal Microbial community Sequencing batch biofilm reactor(SBBR)

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