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A post-treatment to reduce stress concentration sensitivity under intermediate-temperature fatigue in GH4169: High-energy impact composite modification

Transactions of Materials Research

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Transactions of materials Research 2025年第3期1卷

作者： Guoxin Lu Qiang Wang Bonnie Attard Arif Rochman Guofang Zhang Luqing Cui Zhong Ji Glenn Cassar MOE Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Shandong University Jinan 250061 China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical Materials Beijing 100095 China Department of Metallurgy and Materials Engineering University of Malta MSD 2080 Malta Institute of Engineering and Transport The Malta College of Arts Science & Technology PLA 9032 Malta National Key Lab of Aerospace Power System and Plasma Technology Xi’an Jiaotong University Xi’an 710049 China

The study focuses on a novel post-treatment method, high-energy impact composite modification, combining mechanical shot peening and laser shock processing to improve the fatigue performance of the nickel-based superalloy GH4169 at intermediate temperatures. The synergistic interaction between mechanical impact (SP-induced plastic deformation) and laser-induced shock waves enabled a 2.5-fold increase in effective treatment depth (up to 1500 μm) compared to SP alone (400 μm), while achieving a surface hardness of 520 HV and compressive residual stress of −1465 MPa, exceeding single-process results by 4.5% and 54.2%, respectively. The dual-impact approach significantly enhanced surface hardness and compressive residual stress, addressing the high sensitivity to stress concentration. Experimental results demonstrate that HEICM eliminated stress concentration sensitivity at 650 °C, elevating the fatigue limit of notched specimens (Kt = 3) to 638 MPa – equivalent to the fatigue strength of smooth specimens (Kt = 1) in conventional grinding states (636 MPa). This represents a 116% improvement over untreated notched specimens (295 MPa) and surpasses SP-treated counterparts (446 MPa) by 43%, thereby extending the fatigue life of GH4169 alloys in aerospace applications.

关键词： Composite modification Shot peening Surface strengthening Superalloy High-cycle fatigue

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Enhanced ablation resistance and mechanical properties of C MP /C-HfC composites contributed by dual-skeleton reinforcement and coating protection

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Composites Part B: Engineering 2025年

作者： Huafeng Quan Wei Li Dong Huang Woqian Gao Shanying Sui Yuefeng Zhang Hua Liu Ziwen Gu Zhen Fan Jinshui Liu Chong Ye College of Materials Science and Engineering Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University Changsha 410082 PR China Hunan Province Engineering Research Center for High Performance Pitch-based Carbon Materials Hunan Toyi Carbon Material Technology Co. Ltd. Changsha 410000 PR China Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science College of Chemistry and Chemical Engineering Central South University Changsha 410083 PR China Key Laboratory of Advanced Functional Composite Materials Aerospace Research Institute of Materials and Processing Technology Beijing 100076PR China

High-thermal-conductivity mesophase pitch-based carbon fiber reinforced carbon (HTC-C MP /C) composites encounter severe challenges with intrinsic oxidation and thermal ablation at ultra-high temperature, thus enhancing their thermal protection performance is crucial for stable operation. In this study, a dual-skeleton reinforced C MP /C-HfC composites were fabricated via reactive melt infiltration, and the ZrC/SiC@C MP /C-HfC composites were simultaneously prepared based on a coating-matrix integration strategy. The results show that the prepared C MP /C-HfC composites exhibit flexural strengths of =169.03 MPa and =247.15 MPa, representing 52.8% and 63.04% improvements over C MP /C composites, respectively. The mass ablation rate and linear ablation rate are 0.367 mg·s -1 and -1.167 μm·s -1 , showing 86.1% and 107.5% reductions compared to C MP /C composites. Moreover, the ZrC/SiC coating further effectively mitigates ablation-induced powdering and spalling in C MP /C-HfC composites while enhancing both thermal conductivity and flexural mechanical properties. This balanced enhancement of mechanical-thermal-ablative protection performances relies on the synergistic effects of the dual-skeleton structure combining continuous HfC framework and HTC-C MP /C skeleton, and effective thermal protection of the coating system. This work provides novel insights and valuable references for thermal protection design in C MP /C composites.

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[email protected]/PPy-S Hybrid Foam with Paper Window-like Microstructure as Freestanding and Flexible Cathode for the Lithium–Sulfur Battery

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ACS Applied Energy materials 2019年第6期2卷 4151-4158页

作者： Yun Lu Yingna Jia Shuangyi Zhao Lai Chen Yuefeng Su Feng Wu Jian Li Xingxing Liu Shi Chen Renjie Chen School of Material Science and Engineering Beijing Key Laboratory of Environmental Science and Engineering Beijing Institute of Technology Beijing 100081 China Collaborative Innovation Center for Electric Vehicles in Beijing Beijing 100081 China Aerospace Institute of Advanced Materials & Processing Technology Beijing 100081 China

The lithium–sulfur (Li–S) battery is one of the most promising energy-storage systems due to its high energy density. However, the insulation of sulfur and the “shuttle effect” hinder the exertion of its capacity. Rational structure design and functionalization of host materials are crucial for the high-performance Li–S battery. Herein, the carbon foam (CF), whose fiber surface is decorated with polypyrrole (PPy)-modified reduced graphene oxide (rGO) flakes, is chosen as a 3D freestanding matrix to achieve a multifunctional framework with paper window-like microstructure. Acting as both sulfur host and current collector of cathode, the interconnecting carbon fibers of CF afford an integrated flexible conductive network to accelerate electronic transport; additionally, the rGO/PPy attached to carbon fibers not only improve the sulfur loading due to the large specific surface of rGO but also inhibit the “shuttle effect” because of chemisorption to polysulfides from PPy. Thanks to these advantages, the resulting flexible and freestanding electrode displays a high initial discharge capacity (1437 mAh g–1at 0.1 C, 1 C = 1675 mA g–1) and excellent capacity retention at 1 C with average capacity loss of only 0.044% every cycle for over 100 cycles, suggesting that this rational structure design has the potential to be applied in the flexible, stable, and energy-dense Li–S battery.

关键词： Sulfur Organic polymers Electrodes Batteries materials

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Selective Laser Melting of Compositionally Graded Alloys

SSRN

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SSRN 2020年

作者： Wen, Yaojie Zhang, Baicheng Narayan, Ramasubramanian Lakshmi Wang, Pei Xu, Song Zhao, Hao Ramamurty, Upadrasta Qu, Xuanhui Beijing Advanced Innovation Center Materials Genome Engineering Beijing100083 China Advanced Material & Technology Institute University of Science and Technology Beijing Beijing100083 China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Beijing100083 China Department of Materials Science and Engineering Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India IMRE - Institute of Materials Research and Engineering 2 Fusionopolis Way Innovis #08-03 Singapore138634 Singapore Department of Mechanical and Automation Engineering The Chinese University of Hong Kong 3DPTek Co. Ltd. Beijing China School of Mechanical & Aerospace Engineering Nanyang Technological University Singapore

A method for the additive manufacturing of compositionally graded alloys (CGAs) using selective laser melting (SLM) was devised and demonstrated by producing CoCrMo-Nickel based superalloy CGA coupons that are defect-free and with smooth end-to-end variations in the composition and microstructures. The variations in the tensile properties and hardness, measured using high throughput characterization techniques, were rationalized by recourse to the different phases present in the microstructures. The method has the potential to be extended to other material combinations for creating high quality CGA components. © 2020, The Authors. All rights reserved.

关键词： Selective laser melting

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Outer diameter and Surface Quality of Micro Metal Tubes in Hollow Sinking

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Procedia Manufacturing 2020年 47卷 217-223页

作者： Takuma Kishimoto Hayate Sakaguchi Saki Suematsu Kenichi Tashima Satoshi Kajino Shiori Gondo Shinsuke Suzuki Waseda University Graduate School of Fundamental Science and Engineering Department of Applied Mechanics 3-4-1 Okubo Shinjuku Tokyo 169-8555 Japan Factory-Automation Electronics Inc. 1-6-14 Higashi-nakajima Higashi-yodogawa Osaka Osaka 533-0033 Japan National Institute of Advanced Industrial Science and Technology (AIST) Material Processing Group Advanced Manufacturing Research Institute Department of Electronics and Manufacturing Tsukuba East 1-2-1 Namiki Tsukuba Ibaraki 305-8564 Waseda University Faculty of Science and Engineering Department of Applied Mechanics and Aerospace Engineering 3-4-1 Okubo Shinjuku Tokyo 169-8555 Japan Kagami Memorial Research Institute of Materials Science and Technology Waseda University 2-8-26 Nishi-waseda Shinjuku Tokyo 169-0051 Japan

To clarify deformation behavior of tubes in hollow sinking, the outer diameter and surface quality of the final drawn tubes were evaluated. Copper tubes were drawn for one pass under various drawing conditions (e.g., die reduction, drawing speed ratio, and die half angle) without an inner tool. The result of the experiment indicates the deformation behavior of tubes during hollow sinking. The outer diameter of the drawn tube on the die entrance became less than that of the starting material. Free surface roughening seems to develop on the outer surface of the drawn tube on the die entrance side due to the outer diameter reduction. Therefore, the height deviation in the outer uneven surface of the drawn tube on the die entrance became greater than that of the starting material. The height deviation on the die exit side was less than that on the die entrance side because of the tube deformations subjected by the die. The outer diameter decreased from the die approach end as either the drawing speed ratio or the die half angle increased. The height deviation in the outer uneven surface of the drawn tube on the die exit side became larger as the outer diameter decreased from the die approach end due to free surface roughening.

关键词： Tube forming Hollow sinking Micro forming Dimension control

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Non-equilibrium solidification complexions in additive manufacturing enable exceptional creep resistance: An example in nickel-based superalloys

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International Journal of Plasticity 2025年 191卷

作者： Y.S. Li L.Q. Cui J.H. Xu T.Z. Xin S. Jiang Y. Li H.H. Zhang X.F. Dang S. Gao Y.H. Mu K.J. Lu J. Moverare W.F. He National Key Lab of Aerospace Power System and Plasma Technology Xi’an Jiaotong University Xi’an Shaanxi 710049 China School of Mechanical Engineering Xi’an Jiaotong University Xi’an Shaanxi 710049 China Division of Engineering Materials Department of Management and Engineering Linköping University Linköping SE-58183 Sweden School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University Shenyang 110819 China School of Materials Science and Engineering Chang’an University Xi’an Shaanxi 710064 China School of Mechanical Engineering Xi’an Shiyou University Xi’an Shaanxi 710065 China School of Material Engineering Shanghai University of Engineering Science Shanghai 201620 China Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Defense Innovation Institute Academy of Military Science Beijing 100071 China National Key Lab of Aerospace Power System and Plasma Technology Air Force Engineering University Xi’an Shaanxi 710038 China

Insufficient time-dependent properties at elevated temperatures, particularly creep resistance and ductility, are currently crucial factors impeding the use of additively manufactured Hastelloy X (HX). To address this limitation, a micro-nano olive-shaped carbide network was purposely introduced into HX via laser powder bed fusion (L-PBF) and following optimized heat treatment. The inherent chemical heterogeneity combined with the sufficient stored energy of boundaries, induced by the ultrafast cooling rate of the L-PBF process, creates favorable conditions for the formation of micro-nano precipitate networks. Compared to its untreated counterpart, the optimized HX exhibited considerably improved creep resistance, with an 85 % increase in creep life and a 122 % improvement in fracture ductility. Furthermore, through multiscale characterization techniques and theoretical calculations, the preferential precipitation behavior of the micro-nano carbide networks was systematically investigated from both kinetic and thermodynamic perspectives. The superior creep resistance of the L-PBF HX, decorated with carbide networks, stems from the synergistic effects of the high cavity surface energy, effective pinning for grain boundary sliding, and reduced plasticity-assisted diffusion rate, which markedly inhibit the nucleation and growth of microvoids during high-temperature deformations. This work provides a comprehensive understanding of the strengthening mechanisms associated with non-equilibrium solidification-facilitated carbide networks, providing new insights into the targeted design and optimization of L-PBF alloys.

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Shear anisotropy： Tuning high temperature metal hexaborides from soft to extremely hard

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Journal of materials Science & technology 2017年第11期33卷 1371-1377页

作者： Yanchun Zhou Fuzhi Dai Huimin Xiang Bin Liu Zhihai Feng Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Material & Processing Technology Beijing 100076China School of Materials Science and Engineering Shanghai University Shanghai 200444 China

Easy machining into sharp lending edge, nose tip and complex shape components plays a pivotal role in the application of ultrahigh temperature ceramics in hypersonic vehicles, wherein low and controllable hardness is a necessary parameter to ensure the easy machinability. However, the mechanism that driving the hardness of metal hexaborides is not clear. Here, using a combination of the empirical hardness model for polycrystalline materials and density functional theory investigation, the hardness dependence on shear anisotropic factors of high temperature metal hexaborides has been established. It has come to light that through controlling the shear anisotropic factors the hardness of polycrystalline metal hexaborides can be tailored from soft and ductile to extremely hard and brittle, which is underpinned by the degree of chemical bonding anisotropy, i.e., the difference of B-B bond within the B;octahedron and that connecting the B;octahedra.

关键词： Microhardness Electronic structure Elastic constant Borides Structural ceramics

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Self-repairing high entropy oxides

arXiv

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arXiv 2021年

作者： Liu, Zongwen Huang, Pengru Sun, Lixian Liu, Yanping Qu, Jiangtao Cairney, Julie Zheng, Zhong Wang, Zhiming M. Khan, Naveed A. Lai, Zhiping Fu, Li Teng, Bing Zhou, Cuifeng Zhao, Hong Xu, Fen Xiong, Pan Zhu, Junwu Yuan, Peng Tsoutas, Kosta Akhavan, Behnam Bilek, Marcela M. Ringer, Simon P. Novoselov, Kostya S. School of Chemical and Biomolecular Engineering The University of Sydney NSW2006 Australia The University of Sydney Nano Institute The University of Sydney NSW2006 Australia Department of Materials Science and Engineering National University of Singapore 117575 Singapore Guangxi Key Laboratory of Information Materials Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials School of Material Science & Engineering Guilin University of Electronic Technology Guilin541004 China School of Physics and Electronics Hunan Key Laboratory for Super-Microstructure and Ultrafast Process Central South University Hunan410083 China School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney SydneyNSW2006 Australia The Australian Centre for Microscopy and Microanalysis The University of Sydney NSW2006 Australia Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu610054 China Advanced Membranes and Porous Materials Center Division of Physical Science and Engineering King Abdullah University of Science and Technology Thuwal23955 Saudi Arabia State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an710072 China College of Physics Qingdao University Qingdao266071 China Key Laboratory for Soft Chemistry and Functional Materials Ministry Education Nanjing University of Science and Technology Nanjing210094 China CAS Key Laboratory of Mineralogy and Metallogeny Guangdong Provincial Key laboratory of Mineral Physics and Materials Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510640 China School of Physics The University of Sydney NSW2006 Australia School of Biomedical Engineering The University of Sydney NSW2006 Australia

All biological organisms, from plants to living creatures, can heal minor wounds and damage. The realization of a similar self-healing capacity in inorganic materials has been a design target for many decades. This would represent a breakthrough in materials engineering, enabling many novel technological applications, since such materials would be able to resist damage caused by electromagnetic irradiation and/or mechanical impact. Here we demonstrate that a high-entropy oxide is intrinsically capable of undergoing an autonomous self-repairing process. Transmission electron microscopy revealed that the spinel structure of (AlCoCrCu0.5FeNi)3O4 can regrow and repair itself at the atomic level when damaged. Density functional theory calculations reveal that the extra enthalpy stored in the high entropy material during fabrication can be released to effectively heal macroscopic defects by regrowing into a partially ordered state. This extraordinary self-repairing phenomenon makes this new material highly desirable as a coating, enabling structures used in harsh environments to better withstand damage, such as cosmic irradiation in space, nuclear irradiation in nuclear power facilities, or tribological damage. Most importantly, our results set the general design principles for the synthesis of self-repairing materials. Copyright © 2021, The Authors. All rights reserved.

关键词： Entropy

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Solid Electrolytes: A New Lithium‐Ion Conductor LiTaSiO5: Theoretical Prediction, materials Synthesis, and Ionic Conductivity (Adv. Funct. Mater. 37/2019)

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advanced Functional materials 2019年第37期29卷

作者： Qi Wang Jian‐Fang Wu Ziheng Lu Francesco Ciucci Wei Kong Pang Xin Guo State Key Laboratory of Material Processing and Die & Mould Technology Laboratory of Solid State Ionics School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 P. R. China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Clear Water Bay Hong Kong P. R. China Center for Information Photonics and Energy Materials Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 P. R. China Department of Chemical and Biological Engineering The Hong Kong University of Science and Technology Clear Water Bay Hong Kong P. R. China Institute for Superconducting & Electronic Materials University of Wollongong Wollongong New South Wales 2522 Australia

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High-temperature diffusion behavior of ZrC in C matrix and its promotion on graphitization

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Transactions of Nonferrous Metals Society of China 2016年第8期26卷 2257-2262页

作者： Zhong-wei ZHANG Qiang ZHEN Feng ZHENG Fei LU Ce-wen NAN Rong LI Jun-shan WANG State Key Laboratory of New Ceramics & Fine Processing School of Materials Science and EngineeringTsinghua University Beijing 100084 China Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing Technology Beijing 100076 China Research Center of Nano Science and Technology Advanced Material Composite and Dispersion Technology Engineering Research Center of Ministry of Education of China Shanghai University Shanghai 200444 China

C/C composite material is widely used in aerospace field and others, however, it is easy to be oxidized at high *** order to improve the oxidation resistance, ZrC is introduced as an oxidation inhibitor used in matrix modification of C/C composite material. Flat plate samples of ZrC/C composite materials were prepared by hot-pressing sintering. The degree of graphitization increases with rising sintering temperature, and layer structure of carbon matrix is observed clearly in the sample treated at 2273 K. Diffusion behavior of Zr in C matrix at high temperature is studied, which can be generally expressed as D=3.382×10?11 exp[2.029×105/(RT)]. The diffusion of Zr in C matrix leads to the over-saturation of C in the micro area and the oversaturated C precipitates as graphite. This continuous process promotes the transformation of carbon to graphite.

关键词： ZrC carbon material diffusion graphitization

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