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Enhancing strength at elevated temperatures via dynamic high-density mobile dislocations in Mg alloys

Journal of Magnesium and Alloys 2025年

作者： Fan, Mingyu Cui, Ye Zhou, Xin Chen, Junming Zhang, Yang Sun, Lixin Brechtl, Jamieson Fang, Daqing Li, Qian Ding, Qingqing Bei, Hongbin Liaw, Peter K. Xue, Yanzhuo Wang, Xun-Li Lu, Yang Zhang, Zhongwu Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin150001 China Department of Physics and Center for Neutron Scattering City University of Hong Kong Kowloon Hong Kong999077 China Shenzhen Research Institute of City University of Hong Kong Shenzhen Hi-Tech Industrial Park Shenzhen518057 China Department of Mechanical Engineering City University of Hong Kong Kowloon China Physikalisches Institut Westfälische Wilhelms-Universität Münster48149 Germany Department of Materials Science and Engineering The University of Tennessee KnoxvilleTN37996-2100 United States State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University Xi'an710049 China National Engineering Research Center for Magnesium Alloy Chongqing University Chongqing400044 China State Key Laboratory of Advanced Special Steels & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering Shanghai University Shanghai200444 China School of Materials Science and Engineering Zhejiang University Hangzhou310027 China College of Shipbuilding Engineering Harbin Engineering University Harbin150001 China Department of Mechanical Engineering The University of Hong Kong Hong Kong999077 China

Dislocation strengthening, as one of the methods to simultaneously enhance the room temperature strength and ductility of alloys, does not achieve the desired strengthening and plasticity effect during elevated-temperature deformation. Here, we report a novel strategy to boost the dislocation multiplication and accumulation during deformation at elevated temperatures through dynamic strain aging (DSA). With the introduction of the rare-earth element Ho in Mg-Y-Zn alloy, Ho atoms diffuse toward dislocations during deformation at elevated temperatures, provoking the DSA effect, which increases the dislocation density significantly via the interactions of mobile dislocations and Ho atoms. The resulting alloy achieves a great enhancement of dislocation hardening and obtains the dual benefits of high strength and good ductility simultaneously at high homologous temperatures. The present work provides an effective strategy to enhancing the strength and ductility for elevated-temperature materials. © 2025

关键词： Ductility

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Superior electronic/ionic transport dynamics of Zn-Co-OH/MnO 2 heterointerface containing oxygen vacancies for pseudocapacitive storage

SSRN

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SSRN 2023年

作者： Xu, Le Xi, Yukun Huang, Chen Zhang, Junye Hua, Zile Zhou, Jiao-Jiao Yin, Jingzhou Zhang, Lili Li, Wenbin Wang, Jingjing Chen, Luyang Li, Xifei Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai200237 China State Key Laboratory of High-Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai200050 China Xi’an Key Laboratory of New Energy Materials and Devices Institute of Advanced Electrochemical Energy School of Materials Science and Engineering Xi’an University of Technology Shanxi Xi’an710048 China Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials School of Chemistry & Chemical Engineering Huaiyin Normal University Huaian223300 China Shaanxi International Joint Research Center of Surface Technology for Energy Storage Materials China

The superior electronic/ionic transport dynamics of electrode materials have been crucial to achieve appealing high performance for supercapacitors. Herein, a fascinating one-dimensional (1D) zinc cobalt hydroxide nanobelts/0D irregular manganese dioxide nanoparticles (M-ZCOH) have been vertically loaded into the 3D Ni foam (NF) substrate wrapped by nitrogen-doped graphene (NPG) (M-ZCOH/NPG/NF) for supercapacitors. The ingeniously designed M-ZCOH/NPG/NF composites feature powerful built-in electric field (BIEF) introduced by well-defined heterointerface with abundant oxygen vacancies defects. The formed electron accumulation triggering strong interfacial interaction verified by the differential charge density analysis undoubtedly endow M-ZCOH/NPG/NF with the extra driving force to increase the diffusion/adsorption of electrolyte ions, thereby facilitating electron/ion transfer kinetics. Also, the qualitative negative shift of the d band center for M-ZCOH composites further evidences a lower electron/ion transfer barrier compared with the monomers. Obviously, the penetrating understanding of heterointerface on the improved properties is manifestly interpreted by combining theoretical and experimental analysis. Moreover, the ingenious strategy of engineering the heterointerfaces in unique heterostructure with rich defects will provide a new prospect for optimizing other advanced materials in sustainable energy storage systems. © 2023, The Authors. All rights reserved.

关键词： Supercapacitor

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Joint Proper Orthogonal Decomposition: A Novel Perspective for Feature Extraction from Multivariate Cavitation Flow Fields

SSRN

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SSRN 2023年

作者： Wang, Zihao Zhang, Guiyong Huang, Huakun Xu, Hao Sun, Tiezhi State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial Equipment School of Naval Architecture Engineering Dalian University of Technology Dalian116024 China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai200240 China Department of Aeronautical and Aviation Engineering the Hong Kong Polytechnic University Kowloon Hong Kong

Modal decomposition, as a data-driven approach to extract important features from fluid flow, is widely used in the field of fluid mechanics. Cavitating flow is a complex physical phenomenon, and the interpretation of cavitation flow relies on the comprehensive analysis of multi-variable flow field features. However, traditional modal decomposition algorithms, such as Proper Orthogonal Decomposition (POD), ignore the potential interactions and correlations among variables, which limits their effectiveness in capturing the underlying physical characteristics of the system. In this paper, we draw inspiration from the concept of joint representation in the field of multi-modal learning, and propose the use of Joint POD (JPOD) as a promising fluid mechanics analysis tool to extract multi-variable features of cavitation flow. We elaborate on the differences between JPOD and POD in four aspects: reconstruction error, data structure, flow field features, and flow modalities. JPOD increases the reconstruction error slightly but strengthens the correlations between multi-variables in the flow field. The modalities obtained by JPOD exhibit strong regularity and interpretability, and the pattern features between different variables are related, which cannot be achieved by the POD algorithm alone. The successful combination of joint representation and POD algorithm demonstrates that it can be regarded as an optimization and standardization method for traditional modal decomposition algorithms, with broad application prospects in the field of modal decomposition. © 2023, The Authors. All rights reserved.

关键词： Cavitation

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Efficient Ceo2/Zno Heterojunction for Enhanced Heterogenous Photocatalytic Application

SSRN

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SSRN 2024年

作者： Li, Honglin Wu, Rong Ji, Jun Liu, Yue Zhao, Jiahui Sahar, Shafaq Zeb, Akif College of Chemistry and Material Engineering Chao Hu University Hefei238000 China School of Energy Materials and Chemical Engineering Hefei University Hefei City230601 China Key Laboratory of Resource Comprehensive Utilization of Chaohu University Chaohu University Hefei238000 China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University 866 Yuhangtang Rd Hangzhou310058 China Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy College of Materials Science and Engineering Hunan University Changsha410082 China Surface and Materials Technology Institute of Materials Engineering University of Siegen Paul-Bonatz-Straße 9-11 Siegen57076 Germany

Organic pollutants pose a significant challenge due to their toxicity and potential carcinogenicity, posing a severe threat to the environment and human health. Heterogeneous photocatalysts offer promising advantages over traditional water purification methods due to their tunable electronic properties such as bandgap, easy separation from the reaction solution and formidable nanostructures. Herein, we prepare a CeO2/ZnO heterostructure via simple hydrothermal synthesis. The electronic structure of this nanocomposite was tuned to achieve a band gap of ~2.94 eV, which was between the individual bandgaps of CeO2 and ZnO nanoparticles. In addition, the mixed valence character of Ce further enhanced the electronic properties of the CeO2/ZnO heterostructure. The photocatalytic performance of CeO2, ZnO and CeO2/ZnO heterostructure was evaluated and it was found that CeO2/ZnO heterostructure with a Zn/Ce ratio of 0.2 exhibited the highest photocatalytic activity and the degradation efficiency was 99.28% after irradiation for 60 min. It was mainly ascribed to the heterojunction structure of the CeO2/ZnO nanocomposite, leading to a higher separation efficiency of electron-hole pairs and generating more superoxide radicals, which in turn improved the photocatalytic activity effectively. © 2024, The Authors. All rights reserved.

关键词： II-VI semiconductors

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Controlling mass and energy diffusion with metamaterials

arXiv

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arXiv 2023年

作者： Yang, Fubao Zhang, Zeren Xu, Liujun Liu, Zhoufei Jin, Peng Zhuang, Pengfei Lei, Min Liu, Jinrong Jiang, Jian-Hua Ouyang, Xiaoping Marchesoni, Fabio Huang, Jiping State Key Laboratory of Surface Physics Fudan University Shanghai200438 China Graduate School of China Academy of Engineering Physics Beijing100193 China Fudan University Shanghai200438 China Suzhou Institute for advanced research University of Science and Technology of China Suzhou215123 China School of Materials Science and Engineering Xiangtan University Xiangtan411105 China MOE Key Laboratory of Advanced Micro-Structured Materials Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering Tongji University Shanghai200092 China Department of Physics University of Camerino Camerino62032 Italy Fudan University Shanghai200438 China

Diffusion driven by temperature or concentration gradients is a fundamental mechanism of energy and mass transport that inherently differs from wave propagation in both physical foundations and application prospects. Compared with conventional schemes, metamaterials provide an unprecedented potential for governing diffusion processes, based on emerging theories like the transformation and the scattering-cancellation theory that expanded the original concepts and suggested innovative metamaterial-based devices. The term "diffusionics" is used in the review to generalize these noteworthy achievements in various energy and mass diffusion systems. Examples include heat diffusion systems and particle and plasma diffusion systems. For clarity the numerous studies published over the past decade are categorized by diffusion field (i.e., heat, particles, and plasmas) and discussed from three different perspectives: the theoretical perspective, to detail how the transformation principle is applied to each diffusion field;the application perspective, to introduce various intriguing metamaterial-based devices, such as cloaks and radiative coolers;and the physics perspective, to connect with concepts of recent concern, such as non-Hermitian topology, nonreciprocal transport, and spatiotemporal modulation. The possibility of controlling diffusion processes beyond metamaterials is also discussed. Finally, several future directions for diffusion metamaterial research, including the integration of metamaterials with artificial intelligence and topology concepts, are examined. Copyright © 2023, The Authors. All rights reserved.

关键词： Metamaterials

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Periodic Sub-Grain Structure in the Stir Zone and its Effect on Strain Hardening Behavior of Multi-Pass Friction Stir Welded Al-Zn-Mg-Cu Alloy Joints

SSRN

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SSRN 2023年

作者： Chen, Cong Niu, Pengliang Huang, Chunping Li, Wenya Huang, Yongxian Zhang, Bingxian School of Aeronautical Manufacturing Engineering Nanchang Hangkong University Nanchang330063 China Nanchang Hangkong University China School of Materials Science and Engineering China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China Avic Xi’an Aircraft Industry Group Company. Ltd Xi’an710089 China

Al-Zn-Mg-Cu alloy was friction-stir-welded by 4 passes. The effect of the different passes on the grain size, sub-grain boundaries, kernel average misorientation of the stir zone (SZ) were characterized by electron backscatter diffraction. Tensile properties and strain hardening behavior of different joints were also evaluated. Results reveal that the welding passes nearly have no effect on the grain size of SZ. It is very interesting that a periodic sub-grain structure in the SZ can be observed when compared 1 pass with 4 passes joints. 3 passes joint with the lowest sub-grain structure proportion in SZ possesses the best tensile properties and highest strain hardening rate in the stage III. © 2023, The Authors. All rights reserved.

关键词： Aluminum alloys

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Effects of Wall Emissivity on Aerodynamic Heating in Scramjets

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Fluid Dynamics & Materials Processing 2020年第6期16卷 206-216页

作者： Yue Zhou Pengfei Ju School of Aeronautical Science and Technology Beihang UniversityBeijing100191China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education(Tianjin University of Technology) Tianjin300384China

The effects of the wall emissivity on aerodynamic heating in a scramjet are *** supersonic turbulent combustion flow including radiation is solved in the framework of a decoupled strategy where the flow field is determined first and the radiation field *** particular,a finite difference method is used for solving the flow while a DOM(iscrete ordinates method)approach combined with a WSGGM(weighted sum of gray gases)model is implemented for radiative *** nonreactive turbulent channel flows are examined for a DLR hydrogen fueled scramjet changing parametrically the wall *** results indicate that the wall radiative heating rises greatly with increasing the wall *** the wall emissivity rises,the radiative source and total absorption increase,while the incident radiation decreases ***,although the radiative heating can reach a significant level,its contribution to the total aerodynamic heating is relatively limited.

关键词： Scramjet aerodynamic heating wall emissivity radiation

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Influence of Thermal Barrier Coatings on the Creep Properties of Thin-Walled Ni-Based Single Crystal Superalloy

SSRN

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SSRN 2025年

作者： Liu, Jing Wang, Li Yu, Minghan Xu, Liping Min, Shiling Wang, Di Jiang, Xiangwei Dong, Jiasheng Lou, Langhong School of Materials Science and Engineering University of Science and Technology of China Hefei230026 China Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences Shenyang110016 China Liaoning Engineering Research Center for High Temperature Structural Materials of Heavy Gas Turbine Shenyang110016 China Institute of New Materials Guangdong Academy of Sciences Guangzhou510650 China Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology Guangzhou510650 China

The application of thermal barrier coatings (TBCs) onto Ni-based single crystal superalloys has significantly elevated the operating temperatures and enhanced the oxidation resistance of turbine blades. In this paper, influence of TBCs on the creep properties of thin-walled (0.5, 1, and 1.5 mm) Ni-based single crystal superalloy at 1100 °C/120 MPa was investigated. Compared to the bare specimens, an approximately 43.8% increase in the creep rupture life is observed for the T0.5 (0.5 mm wall thickness) coated specimens, no obvious difference could be detected in the T1 coated specimen. However, an approximately 45.2% deterioration in the creep rupture life is detected for the T1.5 coated specimens. Under such experiments, the damage mechanism of TBCs exhibits a strong wall thickness dependence. When cracks are generated in the TC layer of both T0.5 and T1.5 coated specimens, the T0.5 coated specimens exhibit delamination and severe oxidation at the BC/substrate interface, while the T1.5 coated specimens show severe oxidation at either TC/TGO or the TGO/BC interface. In addition, TBCs enhances the creep rupture life of the T0.5 specimens mainly by suppressing the plastic deformation of the substrate. In contrast, for the T1.5 specimens, inhomogeneous plastic deformation and severe oxidation resulting from the segmentation and spallation of TC layer significantly reduce their creep rupture life. These results are valuable for the structural optimization and damage analysis of advance turbine blades. © 2025, The Authors. All rights reserved.

关键词： Single crystals

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A skin-inspired durable de-icing surface with boosting interfacial cracks

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National Science Review 2025年第3期 347-356页

作者： Qiucheng Yang Jinlong Yang Yuhao Hu Xiaopeng Niu Zhenda Liu Jian Zou Junchang Guo Hao Xiong Xingshi Gu Li Yang Fanfei Yu Shunpeng Zhu Ming Ye Xian Yi Xu Deng Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China School of Mechanical and Electrical Engineering University of Electronic Science and Technology of China School of Materials and Energy University of Electronic Science and Technology of China State Key Laboratory of Aerodynamics Institute for Advanced Study Chengdu University Department of Mechanical Engineering The Hong Kong Polytechnic University Bruker nano surface and metrology Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China

Fracture-based interfacial breakage has shown promise in efficiently removing ice accretion. Here, intrigued by the response of human skin to stress-induced deformation, we present a strategy to design tough-skin de-icing surfaces(TSDSs) that actively manipulate crack-induced ice-substrate interfacial breakage during ice removal. This design leverages the surface instability of thin films to generate extensive wrinkling at the ice-substrate interface, which serves as crack initiation sites. We demonstrate efficient ice shedding by creating wrinkles at two length scales: macro-wrinkles for actively initiating the cracks at the rim of the ice and micro-wrinkles for further promoting the stress concentration at the ice-substrate interface. The TSDS(τ < 10 k Pa) displays excellent durability and weather resistance, achieving a large-area ice-self-shedding effect solely through gravity. The universality of the proposed mechanism is verified on multiple materials and potential applications. This design concept offers valuable insights into the creation of durable de-icing materials with enhanced ice-shedding properties.

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Constructing Co/Cov2o6 Tandem Catalytic Heterostructure to Enhance Lithium Polysulfides Conversion in Lithium-Sulfur Batteries

SSRN

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SSRN 2023年

作者： Wang, Ni Li, Wenbin Cao, Guiqiang Duan, Ruixian Pei, Jingjie Luo, Penghui Zhang, Jianhua Wang, Jingjing Li, Xifei Shaanxi International Joint Research Center of Surface Technology for Energy Storage Materials Xi’an Key Laboratory of New Energy Materials and Devices Institute of Advanced Electrochemical Energy School of Materials Science and Engineering Xi’an University of Technology Shaanxi Xi’an710048 China Key Laboratory of Advanced Energy Materials Chemistry Ministry of Education College of Chemistry Nankai University Tianjin300071 China Zhengzhou University Henan Zhengzhou450001 China Xi’an North Huian Chemical Industries Company Shaanxi Xi’an710048 China

The "shuttle effect" caused by polysulfide (LiPSs) dissolution and diffusion is a serious challenge for sulfur (S) cathode in lithium-sulfur batteries (LSBs). Herein, we successfully construct Co/CoV2O6 tandem catalytic heterostructure anchored by N-doped carbon (Co/CoV2O6/NC) by an impregnation-assisted pyrolysis method. The "adsorption-transfer-conversion" tandem catalytic mechanism for LiPSs is realized by utilizing the strong chemical adsorption of CoV2O6 to LiPSs, the strong conversion of Co to LiPSs, and the transport effect of CoV2O6←Co interfacial built-in electric field to polysulfide ions. This can effectively suppress the "shuttle effect" by separating the adsorption and conversion process of LiPSs at different active sites. This coupled with the interfacial Co-N and V-N bonds among Co, CoV2O6 and NC, the high electrical conductivities of metal Co and NC conducting network, the hierarchical porous structure of polyhedral framework collectively endow Co/CoV2O6/NC@S cathode with strong structural stability, weak electrochemical polarization, good electrochemical reversibility and fast electrochemical kinetics. As a result, Co/CoV2O6/NC@S cathode presents the significantly enhanced electrochemical performance with a high capacity of 558.4 mAh g-1 at 0.2 C after 100 cycles and a low capacity decay rate of 0.123% per cycle during 300 cycles at 1 C. © 2023, The Authors. All rights reserved.

关键词： Polysulfides

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