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Effect of fiber breakage defect and waviness defect on compressive fatigue behavior and damage evolution of 3D multiaxial braided composites

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Chinese Journal of Aeronautics 2025年第2期 495-508页

作者： Yan SUN Yifan ZHANG Tao LIU Yunjuan JING Jun MA Yao LU Chan WANG Xinhai HE Xiaogang CHEN Wei FAN School of Textile Science and Engineering Xi'an Polytechnic University Key Laboratory of Advanced Textile Composite Materials Ministry of EducationTiangong University Shaanxi Yuanfeng Textile Technology Research Co.LTD. Longi Green Energy Technology Co.LTD. Department of Textile Engineering and Materials School of MaterialsThe University of Manchester Key Laboratory of Functional Textile Material and Product of Ministry of Education Xi'an Polytechnic University

This paper reports the effects of fiber breakage defects and waviness defects on the compressive fatigue behavior and the progressive damage evolution process of 3D Multiaxial Braided composites(3DMBCs). Combined with finite element compression simulation and ultra-depth microscope, the internal defect content of composites with different braiding angles was *** results demonstrate that the weakening effect of waviness and fiber breakage defects is greater than the strengthening effect of the braiding angle. This causes the fatigue resistance of 3DMBCs with the 31° braiding angle being better in both directions of 0° and 90°. The increase of 4° waviness and 10% fiber breakage defect results in the average fatigue life of composites being shortened by 48% and the energy consumption rate increased by 10% at 85% stress level in 90° compression direction. The alteration in loading direction modifies the included angle corresponding to the stress component. The stress component parallel to the fiber direction under compressive fatigue load leads to interfacial debonding in the composites, whereas the stress component perpendicular to the fiber direction results in pronounced shear failure.

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Facile synthesis of novel 2D mesoporous g-C3N4/TiO2 heterojunction composites with high photocatalytic performance

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Ceramics International 2025年

作者： Wang, Miao-miao Li, Qun-yan Liu, Jun-guo Gao, Xuan Wei, Qi Chen, Wen-juan Faculty of Materials and Manufacturing Beijing University of Technology 100 Pingleyuan Chaoyang District Beijing100124 China The Key Laboratory of Advanced Functional Materials Ministry of Education of China 100 Pingleyuan Chaoyang District Beijing100124 China College of Food Science and Biology Hebei University of Science and Technology Hebei Province Shijiazhuang050018 China

The construction of heterojunction between semiconductors is considered an effective strategy for enhancing photocatalytic capability. A rational design of mesoporous g-C3N4/TiO2 heterojunction composites was successfully synthesized by a combination of facile template approach and solution method, utilizing melamine as the precursor and titanium oxysulfate as the titanium source. Compared with the single mesoporous g-C3N4 (MCN), the mesoporous g-C3N4/TiO2 composites (MTCN-x) showed a significant increase in specific surface area and photoelectrochemical properties. Notably, sample MTCN-10 with 10 wt% TiO2 addition exhibited the highest specific surface area at 76.9 m2/g, accompanied by a pore volume of 0.11 cm3/g. The 2D mesoporous g-C3N4/TiO2 composites (MTCN-x) exhibit excellent photocatalytic performance. This was attributed to the red shift in the wavelengths of the UV–Vis absorbing sidebands of the composites, and the construction of heterojunctions effectively shortened the migration distances of the photogenerated electrons and holes, which reduced the rate of their complexation and increased the possibility of reaction with the pollutants. MTCN-10 was able to decompose 99.9 % of methyl orange within 120 min under visible light. The degradation rate remained above 95.0 % after five cycles, demonstrating excellent catalytic stability. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Mesoporous materials

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Spin angular momentum engineering within highly localized focal fields: from simple orientation to complex topologies

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Photonics Research 2025年第04期 995-1009页

作者： YONGXI ZENG YANZHONG YU JIAN CHEN HOUAN TENG MUSHENG CHEN PINGHUI WU QIWEN ZHAN College of Physics and Information Engineering Quanzhou Normal University School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Fujian Provincial Key Laboratory for Advanced Micro-nano Photonics Technology and Devices & Key Laboratory of Information Functional Material for Fujian Higher Education

Optical skyrmions, as quasiparticles with non-trivial topological structures, have garnered significant attention in recent years. This paper proposes a method for customized spin angular momentum (SAM) distribution in highly localized focal fields, thereby enabling the generation of SAM skyrmion and bimeron topologies. The skyrmionic SAM textures can be flexibly controlled, such as polarity, vorticity, and helicity. In addition, the two-dimensional projection plane can be arbitrarily oriented within three-dimensional space.

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Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

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Acta Metallurgica Sinica(English Letters) 2019年第6期32卷 669-676页

作者： Zhi-Peng Sun Fu-Zhi Dai Ben Xu Wen-Zheng Zhang Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Science and Technology of Advanced Functional Composite Laboratory Aerospace Research Institute of Materials and Processing TechnologyBeijing 100076China

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix *** a key feature of microstructure,the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial *** letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics *** found that the ferrite grain tends to grow into an elongated plate-like shape,independent of its initial confi *** fi nal shape of the ferrite is closely related to the misfi t between the two phases,with the longest direction and the broad facet of the plate being,respectively,consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC)*** strain energy calculation in the framework of Eshelby’s inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically *** is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.

关键词： Coherent ferrite Anisotropic growth Molecular dynamics simulation Burgers vector content Eshelby’s inclusion theory

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Anion-Deficient Transition Metal Oxynitrides as Anode Materials for Solid Oxide Fuel Cells

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Chemistry - A European Journal 2025年第26期31卷 e202500503页

作者： Zhang, Shi-Rui Wang, Xiao-Ming Li, Wen Fang, Lei-Ming Liu, Tian-Hui Yang, Zu-Pei Kuang, Xiao-Jun Jiao, Huan Department of Key Laboratory of Macromolecular Science of Shaanxi Province Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Laboratory for Advanced Energy Technology School of Chemistry & Chemical Engineering Shaanxi Normal University Shaanxi Province Xi'an710062 China Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Sichuan Mianyang621900 China Advanced Materials Research Group Faculty of Engineering The University of Nottingham University Park NottinghamNG7 2RD United Kingdom Industrial Training Centre Shenzhen Polytechnic University Guangdong Province Shenzhen518055 China School of Materials Science and Engineering Shaanxi Normal University Shaanxi Xi'an710062 China Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials College of Chemistry and Bioengineering Guilin University of Technology Guilin541004 China

Transition metal oxynitrides, with their unique electronic structures and excellent conductivity, hold significant promise as anode materials in fuel cells. In this study, we synthesized and characterized two novel anion-deficient transition metal oxynitrides: Ca4La8V4O8N12 and Sr3La9V4O7N13. Their crystal structures were determined via Rietveld refinement of X-ray and neutron diffraction data, revealing a higher concentration of anion vacancies in Sr3La9V4O7N13. As a result, Sr3La9V4O7N13 exhibits significantly enhanced electrical conductivity compared to Ca4La8V4O8N12. Density functional theory (DFT) calculations indicate that Sr3La9V4O7N13 possesses higher defect formation energies, influencing its band structure and facilitating electron transitions, thereby enhancing conductivity. This study underscores the role of anion deficiencies in modulating the electronic properties of transition metal oxynitrides and offers new insights for designing high-performance anode materials for solid oxide fuel cells (SOFCs). © 2025 Wiley-VCH GmbH.

关键词： Rietveld refinement

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Crystallography of precipitates in Mg alloys

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Journal of Magnesium and Alloys 2021年第2期9卷 416-431页

作者： Zhang-Zhi Shi Hong-Ting Chen Ke Zhang Fu-Zhi Dai Xue-Feng Liu Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Key Laboratory for Advanced Materials Processing of Ministry of EducationSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China

Crystallography of precipitates in Mg alloys is indispensable to explain and predict alloy microstructures and *** order to obtain a global understanding of diversified experimental results,a general theory of singular interface is introduced,which provides the physical base and calculation methodology for interpreting precipitate morphology and orientation relationship(OR),especially useful for understanding irrational facets and *** by the theory,recent experimental findings are systematically summarized,including thermally stable and metastable precipitates with various crystal ***,theoretical advances inspired by the findings are introduced,which deepens our understanding on OR selection and preference of irrational *** last,future research directions in this field are proposed.

关键词： Mg alloys Precipitation Facet Orientation relationship

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Parity-controlled gate in a two-dimensional neutral-atom array

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Physical Review A 2025年第2期111卷 022420-022420页

作者： F. Q. Guo Shi-Lei Su Weibin Li X. Q. Shao Center for Quantum Sciences and School of Physics Northeast Normal University Changchun 130024 China School of Physics Key Laboratory of Materials Physics of Ministry of Education and International Laboratory for Quantum Functional Materials of Henan Zhengzhou University Zhengzhou 450001 China Institute of Quantum Materials and Physics Henan Academy of Science Henan 450046 China School of Physics and Astronomy and Centre for the Mathematics and Theoretical Physics of Quantum Non-equilibrium Systems The University of Nottingham Nottingham NG7 2RD United Kingdom Center for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education Northeast Normal University Changchun 130024 China

We propose a parity-controlled gate within a two-dimensional Rydberg atom array, enabling efficient discrimination between even and odd parities of virtually excited control atoms by monitoring the dynamic evolution of an auxiliary atom. This is achieved through the use of spin-exchange dipolar interactions between Rydberg states and coupling between ground states and Rydberg states. For practical applications, we explore its implementation in three-qubit repetition codes and rotated surface codes featuring XZZX stabilizers, enabling single-shot readout of stabilizer measurements. Comprehensive numerical simulations are conducted to assess the feasibility of the proposed approach, taking into account potential experimental imperfections such as unwanted interactions between Rydberg states, atomic position fluctuations, laser phase noise, and Rabi amplitude noise. Our study highlights the inherent advantages of the physical mechanisms underlying parity measurement, demonstrating its reliability and practicality. These findings establish our protocol as a highly promising solution for quantum error detection and computation within Rydberg atom systems, with significant potential for future experimental realizations.

关键词： Rydberg states

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Crystal structure of Cr_4AlB_4: A new MAB phase compound discovered in Cr-Al-B system

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Journal of Materials science & technology 2019年第4期35卷 530-534页

作者： Haiming Zhang Fu-zhi Dai Huimin Xiang Zhili Zhang Yanchun Zhou Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials & Processing Technology School of Mechanical Electronic and Control EngineeringBeijing Jiaotong University

In this communication, the crystal structure of Cr_4AlB_4, a new MAB phase compound(where M is a transition metal, A is Al or Si, B is boron) discovered in Cr-Al-B system is reported. This new MAB phase was synthesized from a mixture of CrB and Al powders at 1000?C and its crystal structure was determined by a combination of X-ray diffraction, first-principles calculations and energy dispersive X-ray spectroscopy(EDS). Cr_4AlB_4 crystallizes in an orthorhombic structure with Immm space group. The lattice constants are a = 2.9343(6) ?, b = 18.8911(0) ?, c = 2.9733(7) ?, and the atomic positions are Cr1 at 4 g(0, 0.2936(5),0), Cr2 at 4 h(0.5, 0.5859(7), 0), Al at 2 b(0, 0.5, 0.5), B1 at 4 h(0, 0.3839(8), 0.5) and B2 at 4 g(0.5, 0.6646(2),0.5).

关键词： Cr4AlB4 MAB phases Crystal structure Layered ternary borides Ultrahigh temperature ceramics

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Sn-Mediated Local Atomic Ordering Enhances Reversible Anionic Redox Activity in Cation-Disordered Li1.3Mn0.4Nb0.3O2 Cathodes

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advanced Energy Materials 2025年第0期

作者： Sun, Gang Nie, Dan Zhu, Qingjun Gao, Lijun Chang, Yi-Hung Liu, Han Yang, Jiayi Ren, Yang Shao, Yu-Cheng Ishii, Hirofumi Sui, Xulei Wang, PanPan Wang, Hsiao-Tsu Wang, Zhenbo Shenzhen Key Laboratory of Special Functional Materials Shenzhen Engineering Laboratory for Advance Technology of Ceramics Guangdong Research Center for Interfacial Engineering of Functional Materials Guangdong Provincial Key Laboratory of New Energy Materials Service Safety College of Materials Science and Engineering Shenzhen University Shenzhen518071 China Bachelor's Program in Advanced Materials Science Tamkang University No.151 Yingzhuan Rd. Tamsui Dist. New Taipei25137 Taiwan Department of Physics City University of Hong Kong 999077 Hong Kong National Synchrotron Radiation Research Center 101 Hsin-Ann Road Hsinchu Science Park Hsinchu300092 Taiwan State Key Laboratory of Space Power-Sources MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage MOE Engineering Research Center for Electrochemical Energy Storage and Carbon Neutrality in Cold Regions School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin150001 China

Recent advances in lithium-ion batteries have revealed the potential of Li-excess cation-disordered rock salt (DRX) cathodes, which expand the design space for cathode materials. The evidence of facile lattice substitution further provides a key strategy for activating redox reaction centers and enhancing the cycling performance of such materials. Here, the study explores how Sn-mediated local atomic ordering enhances reversible anionic redox activity in Li1.3Mn0.4Nb0.3O2 through the use of aberration-corrected scanning transmission electron microscopy, ex/in situ X-ray techniques, and theoretical calculation. The results demonstrate that Sn incorporation optimizes the local atomic structure, fostering the formation of rapid Li+ diffusion "elevator" pathways and short-range ordered structures, thereby enhancing the Li+ transport network. Additionally, quantitative analysis of the redox pathways and degree of participation for Mn and O during charge–discharge cycles reveals that the Sn-mediated electrode exhibits enhanced anionic O redox activity at high charging voltages, maintaining elevated activity throughout subsequent cycling. This sustained performance not only indicates increased redox capabilities but also suggests improved structural stability. By elucidating the complex interplay between composition, local structure, and performance, this study advances the understanding of DRX materials and underscores the potential of strategic elemental substitution for optimizing disordered cathode materials in next-generation energy storage systems. © 2025 Wiley-VCH GmbH.

关键词： Redox reactions

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Dislocation-mediated migration of interphase boundaries

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Journal of Materials science & technology 2019年第11期35卷 2714-2726页

作者： Zhipeng Sun Fuzhi Dai Ben Xu Wenzheng Zhang School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Science and Technology of Advanced Functional Composite Laboratory Aerospace Research Institute of Materials and Processing TechnologyBeijing 100076China Key Laboratory of Advanced Materials(MOE) State Key Laboratory of New Ceramics and Fine ProcessingChina

Faceted interphase boundaries(IPBs)are commonly observed in lath-shaped precipitates in alloys consisting of simple face-centred cubic(fcc),body centred-cubic(bcc)or hexagonal closed packed(hcp)phases,which normally contain one or two sets of parallel *** influence of these dislocations on interface migration and possible accompanying long-range strain field remain *** elucidate this,we carried out atomistic simulations to investigate the dislocation-mediated migration processes of IPBs in a pure-iron *** results show that the migration of these IPBs is accompanied with the slip of interfacial dislocations,even in high-index slip planes,with two migration modes were observed:the first mode is the uniform migration mode that occurs only when all of the dislocations slip in a common slip plane.A shear-coupled interface migration was observed for this *** other interfaces propagate in the stick-slip migration mode that occurs when the dislocations glide on different slip planes,involving dislocation reaction or tangling.A quantitative relationship was established to link the atomic displacements with the dislocation structure,slip plane,and interface *** macroscopic shear deformation due to the effect of overall atomic displacement shows a good agreement with the results obtained based on the phenomenological theory of martensite *** findings have general implications for the understanding of phase transformations and the surface relief effect at the atomic scale.

关键词： Interphase boundary migration O-line interface Shear-coupled interface migration Dislocation gliding Atomic displacement

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