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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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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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Cu-Driven Active Cu2Se@MXene Heterointerface Reconstruction and Co Electron Reservoir Toward Superior Sodium Storage

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advanced Energy Materials 2025年第0期

作者： Lu, Chengxing Li, Boyu Shi, Mengjie Li, Qun Liu, Kun Lu, Cuiyun Liao, Jingwen Hu, Ziyue Wei, Xiaoyan Li, Chunsheng Sun, Yan Liu, Tong Liu, Ronghui Zhao, Qing Tianjin International Joint Research Centre of Surface Technology for Energy Storage Materials College of Physics and Materials Science Tianjin Normal University Tianjin300387 China School of Chemical Engineering and Safety Shandong University of Aeronautics Binzhou256600 China Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of China School of Chemistry and Life Sciences Suzhou University of Science and Technology Jiangsu Province Suzhou215009 China Tianmushan Laboratory 166 Shuanghongqiao Street Pingyao Town Yuhang District Hangzhou311115 China School of Chemistry Beijing Advanced Innovation Center for Biomedical Engineering Beihang University Beijing100191 China Nankai University Tianjin300071 China

Heterostructure engineering and active component reconstruction are effective strategies for efficient and rapid charge storage in advanced sodium-ion batteries (SIBs). Herein, sandwich-type CoSe2@MXene composites are used as a model to reconstruct new active Cu2Se@MXene heterostructures by in situ electrochemical driving. The MXene core provides interconnected pathways for electron and ion conduction, while also buffering volumetric expansion to stabilize the structure. This reconstructed Cu2Se@MXene heterointerface features abundant sodium storage active sites, enhanced Na+ adsorption, and diffusion kinetics, thus increasing sodium storage capacity. Moreover, the elevated Co valence state during the discharge process allows it to act as an electron reservoir to provide additional electron supply for Cu2Se conversion and accelerate the sodium storage kinetics. When employed as an anode in SIBs, the CoSe2@MXene electrode exhibits high capacity (694 mAh g−1 at 0.1 A g−1), excellent rate performance (425 mAh g−1 at 20 A g−1), and exceptional durability (437 mAh g−1 after 10 000 cycles at 5 A g−1 with a 0.0014% capacity decay per cycle). The electrochemical reconstruction and sodium storage mechanism of Cu2Se@MXene anode is further revealed through ex situ characterization and theoretical calculations. This work provides a new approach for designing advanced conversion-type anodes for SIBs. © 2025 Wiley-VCH GmbH.

关键词： Sodium-ion batteries

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Non-fullerene small molecule electron acceptors for high-performance organic solar cells

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Journal of Energy Chemistry 2018年第4期27卷 990-1016页

作者： Hao Lin Qiang Wang Key Laboratory of Applied Surface and Colloid Chemistry National Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University

Fullerenes and their derivatives are important types of electron acceptor materials and play a vital role in organic solar cell devices. However, the fullerene acceptor material has some difficulties to overcome the intrinsic shortcomings, such as weak absorption in the visible range, difficulty in modification and high cost, which limit the performance of the device and the large-scale application of this type of acceptors. In recent years, non-fullerene electron acceptor material has attracted the attention of scientists due to the advantages of adjustable energy level, wide absorption, simple synthesis, low processing cost and good solubility. Researchers can use the rich chemical means to design and synthesize organic small molecules and their oligomers with specific aggregation morphology and excellent optoelectronic prop- erties. Great advances in the field of synthesis, device engineering, and device physics of non-fullerene acceptors have been achieved in the last few years. At present, non-fullerene small molecules based photovoltaic devices achieve the highest efficiency more than 13% and the efficiency gap between fullerenetype and non-fullerene-type photovoltaic devices is gradually narrowing. In this review, we explore recent progress of non-fullerene small molecule electron acceptors that have been developed and led to highefficiency photovoltaic devices and put forward the prospect of development in the future.

关键词： Organic solar cells Non-fullerene Electron acceptors Bulk heterojunction

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Design and characterization of a novel Cu_(2.3)Al_(1.3)Ni_(1.7)SnCr_(0.3) multi-principal element alloy coating on magnesium alloy by laser cladding

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Journal of Materials Science & technology 2023年第21期152卷 220-236页

作者： Lipeng Jiang Xiufang Cui Guo Jin Zhimin Tian Xin Wen Haoliang Tian Erbao Liu Institute of Surface/Interface Science and Technology Key Laboratory of Superlight Material and Surface Technology of Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Beijing Beijing Institute of Aeronautical MaterialsBeijing 100095China Institute of Defense Engineering AMSPLABeijing 100850China

The evaporation and dilution of substrate seriously limit the performance of laser cladding coatings on magnesium *** order to overcome the above shortcomings,a multi-step ultrasonic assisted laser remelting technology was proposed to improve the performance of the *** this work,a novel Cu_(2.3)Al_(1.3)Ni_(1.7)SnCr_(0.3) multi-principal element alloy coating(MPEAC)was prepared on the surface of mag-nesium *** techniques such as transmission electron microscopy(TEM),electron back scatter diffraction(EBSD)and scanning electron microscopy(SEM)were employed to characterize the microstructure and phase composition of the *** the phase structure and morphology at the interface between the coating and the substrate were also studied via focus ion beam(FIB)and TEM *** addition,the corrosion and wear resistance ability of the coatings were monitored by potentiodynamic polarization(PDP),and electrochemical impedance spectroscopy(EIS),hardness and friction *** results show that Cu_(2.3)Al_(1.3)Ni_(1.7)SnCr_(0.3) MPEAC with ultrasonic assisted is composed of FCC phase and eutectic phases(Cu_(10)Sn_(3) and Cu_(2)Ni_(3)Sn_(3)).Due to the forced convection generated by ultrasonic waves,some Cu and Ni phases are precipitated around Cu_(2)Ni_(3)Sn_(3) phases,which is beneficial to enhance the corrosion *** of the grain refinement effect caused by ultrasonic,the wear resistance of the coating is also ***,ultrasonic vibration can effectively weaken and eliminate the texture density of the Cu_(2.3)Al_(1.3)Ni_(1.7)SnCr_(0.3) MPEAC fabricated by laser cladding.

关键词： Magnesium alloy Multi-principal element alloy coating Ultrasonic assisted laser cladding Corrosion resistance Wear resistance

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Preparation of Al-based amorphous coatings and their properties

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Journal of Rare Earths 2021年第3期39卷 340-347,I0004页

作者： Lei Jin Le Zhang Kaige Liu Zhigang Che Kai Li Ming Zhang Bo Zhang Science and Technology on Power Beam Process Laboratory AVIC Manufacturing Technology InstituteBeijing 100024China Department of Materials Application Research AVIC Manufacturing Technology InstituteBeijing 100024China Aeronautical Key Laboratory of Advanced Surface Engineering Technology AVIC Manufacturing Technology InstituteBeijing 100024China

Al_(86)Ni_(8)Co_(1)La_(1)Y_(2)Gd_(2) amorphous coatings were prepared using cold gas kinetic spray *** results show that Al_(86)Ni_(8)Co_(1)La_(1)Y_(2)Gd_(2) amorphous coatings are achieved with the porosity about 3.2%,thickness about 893 μm,the amount of amorphous phase about 82.5%,the hardness about 300 *** corrosion potential and anti-corrosion life of 7075 T6 alloy aluminum are about-0.78 V and 72 h,*** electrochemical analysis and neutral salt spray are about-0.69 V corrosion potential and 274 h anti-corrosion life for amorphous Al-based coatings,***,the life of the Albased amorphous coatings is about 3.8 times that of 7075 T6 aluminum ***,the failure mechanism was analyzed using TEM in this *** a word,Al_(86)Ni_(8)Co_(1)La_(1)Y_(2)Gd_(2) coatings keep dense structure,high amorphous content,favorable amorphous phase stabilizing ability and longer anticorrosion *** is,Al_(86)Ni_(8)Co_(1)La_(1)Y_(2)Gd_(2) coatings have better comprehensive ***,these findings indicate that the present Al_(86)Ni_(8)Co_(1)La_(1)Y_(2)Gd_(2) amorphous coatings prepared using cold gas kinetic spray technique can protect aluminum alloy very well and they can be considered to be used in aviation field.

关键词： Al-based amorphous material Coatings Cold spray Properties Rare earths

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Room-temperature sputtered-SnO_(2) modified anode toward efficient TiO_(2)-based planar perovskite solar cells

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Science China(Technological Sciences) 2021年第9期64卷 1995-2002页

作者： LI Dan LI Yong LIU ZhiKe WANG DaPeng LIU ShengZhong(Frank) Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119China

It is of the utmost importance to promote the charge transport and retard the heterojunction barrier in the functional layers and at their adjacent interfaces to pursuit excellent photovoltaic characteristics of the perovskite solar cells(PSCs). Here, roomtemperature sputtered-SnO_(2) films are introduced to modify FTO anode for improving carrier extraction and aligning energy band in the TiO_(2)-based planar PSCs. For the SnO_(2)-modified substrate with suitable sputtering duration, the following TiO_(2) film exhibits smoother surface roughness, less surface defects, and lower the trap-assisted interfacial recombination than that directly on the FTO, further facilitating the growth of perovskite grain size and promoting the extraction efficiency of charge carriers. On the basis of the optimized SnO_(2)(6 nm)/TiO_(2) stack layer as electron transport layer(ETL), the PSC exhibits an outstanding power conversion efficiency of 21.45%, which is much better than that of the single TiO_(2)-based device(19.68%). More importantly, the cell with the bilayer ETL shows a long-term stability against air, maintaining over 76% of its initial efficiency after 40 d. These achievements suggest that this study provides a feasible path to design energy level alignment and low temperature ETL for highly efficient and stable PSCs.

关键词： sputtered-SnO_(2) anode modification bilayer ETL TiO_(2) PSC device

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In-situ Tension of Dendrite-Reinforced Zr-based Metallic-GlassMatrix Composites

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Acta Metallurgica Sinica(English Letters) 2014年第4期27卷 621-626页

作者： Huijun Yang Junwei Qiao Song Wang Yong Zhang Research Institute of Surface Engineering Taiyuan University of Technology College of Materials Science and Engineering Taiyuan University of Technology State Key Laboratory of Advanced Metals and Materials University of Science and Technology Beijing

The evolution of shear bands in the glassy matrix composites was observed and analyzed during in-situ *** on the simple calculation,the temperature rise within the shear bands is sufficient to cause the formation of viscous shearing layer,resulting in the early ***-based metallic-glass-matrix composites（labeled as DH1 and DH2） exhibit improved tensile ductility rather than brittle failure,since the existence of secondary ductile dendrites promotes the impedance of prompt propagation of shear bands,evidenced by the multiplication of shear bands.

关键词： Amorphous alloy Deformation behavior Shear bands Notch

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Creep behavior and effect factors of a TiAl–Nb alloy at high temperature

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Progress in Natural Science:Materials International 2021年第3期31卷 477-485页

作者： Shunke Zhang Sugui Tian Gengyu Li Ning Tian Fangwei Jin Huichen Yu Xiaoxia Lv Guangyan Wang Deyuan Li Shenyang University of Technology Guizhou University of Engineering Science Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Science and Technology on Advanced High Temperature Structural Materials Laboratory AVIC Beijing Institute of Aeronautical Materials

The effect of solution treatment on the microstructure and creep properties of forged TiAl-Nb alloys was *** results showed that the microstructure of forged alloy mainly consisted of γ/α2lamellar colonies and fine equiaxed recrystallized γ/α*** the solution treatment the microstructure of the alloy transformed into a fully lamellar structure due to the lamellar colonies growth by consuming equiaxed *** with the forged alloy the creep life of the solution treated alloy at 800℃/220 MPa increased from 116 h to 339 *** better creep resistance may be attributed to the transform of fine equiaxed γ/α2grain to the lamellar colonies with serrated grain boundaries due to the solution *** deformation mechanism of the solution treated alloy during creep is considered to be dislocation slipping within the lamellar γ/α2phases,and the dislocation movement may be hindered by the γ/α2interface and the formation of dislocation *** interaction of the dislocations with the tangles may increase the resistance of the dislocation motion and hence improve the creep resistance of the *** was found that during the creep of the forged alloys the cracks mainly initiated at the equiaxed grain,and in the solution treated alloy the cracks initiated at the grain *** creep continued the cracks propagated and connected to each other,leading to the damage and rupture of the forged and solution treated alloys.

关键词： Forged TiAl–Nb alloy Solution treatment Microstructure Creep Deformation and damage

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Plastic deformation analysis and forming quality prediction of tube N C bending

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Chinese Journal of Aeronautics 2016年第5期29卷 1436-1444页

作者： Lu Shiqiang Fang Jun Wang Kelu National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology School of Aeronautical Manufacturing Engineering Nanchang Hangkong University Nanchang 330063 China Jiangxi Key Laboratory of Surface Engineering Jiangxi Science and Technology Normal University Nanchang 330013 China

Plane strain assumption and exponent hardening law are used to investigate the plastic deformation in tube bending. Some theoretical formulae including stress, curvature radius of neutral layer, angle of neutral layer deviation, bending moment, wall thickness variation and crosssection distortion, are developed to explain the phenomena in tube bending and their magnitudes are also determined. During unloading process, the springback angle is deduced using the virtual work principle, and springback radius is also given according to the length of the neutral layer which remains unchanged before and after springback. The theoretical formulae are validated by the experimental results or the validated simulation results in literature, which can be used to auicklv predict the forming aualitv of tube numerical control （NC） bending.

关键词： Forming quality Plane strain Tube NC bending Theoretical analysis Virtual work principle

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