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Chinese materials Conference, 2018

作者： Hu, Chunyan Kong, Zhiqiang Liu, Xinling Tao, Chunhu Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Aviation key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China

ISBN: (纸本)9783035713848

With the development of aero-engine with high specific flux, high thrus-weight ratio, and high turbine inlet temperature, it is an effective way to improve the cooling efficiency by designing dense gas film holes on the blade surface of the turbine blades, especially at the intake side. However, the introduction of gas film holes destroys the geometrical integrity of the blade structure, resulting in a multiaxial high stress state of the blade material around the small holes, which seriously affects the strength and life of the cooling blades. In addition, the geometry design of the gas film holes also directly affects the temperature and the oxidation rate of the turbine rotor blades. In this paper, the researches on the mechanical properties and oxidative damage of the gas film holes at home and abroad in recent years have been systematically introduced. The effects of gas film holes on the durability and fatigue properties, the high temperature oxidation behavior of single crystal superalloys, and the thin-walled effect of oxidative damage of gas film holes have been systematically described. © 2019 Trans Tech Publications, Switzerland.

关键词： Turbomachine blades

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Research Progress on Microstructure Characterization of Silicon Carbide Fibers

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Journal of Physics: Conference Series 2021年第1期2101卷

作者： Xingjian Zhang Zixi Cai Jinjuan Fan Changkui Liu Jinfa Ye AECC Beijing Institute of Aeronautical Materials Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing 100095 China Northwestern Polytechnical University Queen Mary University of London Engineering School NPU Xi'an 710129 China Fujian LEADASIA New Material Limited Company Quanzhou 362000 Fujian China

Ceramic matrix composites have excellent properties such as high temperature resistance and oxidation resistance, and have good application prospects in the hot end parts of engines. In ceramic matrix composites, the microstructure composition of silicon carbide fibers determines their macroscopic properties. Therefore, this article takes silicon carbide fiber as the research object, summarizes the existing SiC fibers structure, composition, and morphology characterization methods, compares the development and advantages and disadvantages of XRD, SEM, TEM and other testing equipment analysis, and proposes The problems of sample preparation, surface defects and internal structure changes in the microstructure characterization of silicon carbide fibers are discussed, which provides a reference for the preparation of high-performance SiC fibers and the improvement of their characterization work.

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Analysis of the effect of fretting wear on key structural components of TB6 titanium alloy with actual failure cases

Analysis of the effect of fretting wear on key structural co...

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2018年先进电子材料、计算机与材料工程国际学术会议（AEMCME 2018）

作者： Huanping Kong Changkui Liu AECC Beijing Institute of Aeronautical Materials Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Aviation Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation

ISBN: (纸本)9781510874466

As the main metal structure materials, titanium alloys have been widely applied in aerospace and other military industries. Titanium alloy develops on the way of high performance and functionalization. Compared with other materials, titanium alloy has high surface integrity and high fretting damage sensitivity. In this paper, the failure case of TB6 high strength titanium alloy key structural parts is taken as the breakthrough point to analyze the effect of surface fretting wear damage on its performance. The appearance inspection, macro and micro morphology observation and energy spectrum analysis were carried out, and the microstructure examination and hardness test were also adopted. The results showed that the fracture property of lug of TB6 high strength titanium alloy was fatigue fracture, and the fretting wear damage of the inner surface of lug hole was the main reason for the fatigue crack initiation. This case is a typical example of titanium alloy structure failure due to fretting wear, which provides reference for the prevention of the recurrence of such faults.

关键词： Analysis of the effect of fretting wear on key structural components of TB6 titanium alloy with actual failure cases

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Low cycle fatigue properties of 7050-T7451 aluminum alloy under different strain ratios

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IOP Conference Series: materials science and Engineering 2020年第2期768卷

作者： Dihua Tong Yuhuai He Benrun Hu Bo Chen Yanguang Zhao Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation AECC Beijing Institute of Aeronautical Materials Beijing 100095 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 P.R.China

The low cycle fatigue properties of 7050-T7451 aluminum alloy was studied. The low cycle fatigue properties of 7050-T7451 aluminum alloy at three strain ratios R = -1, 0.02, and 0.5 were measured by axial strain control method on MTS electro-hydraulic servo testing machine. In this research, the relationship between cyclic stress and strain at strain ratio R = -1 and the average stress relaxation effect of R = -1, 0.05 were given. The equivalent strain model was used to draw the strain-life curve for low cycle fatigue life data. The results show that under different strain ratios of 7050-T7451 aluminum alloy, the same strain amplitude in the high strain region leads to approximate fatigue life, and the effect of the strain ratio is only reflected in the low strain region.

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Effects of the specimen form on high cycle fatigue properties of 7050-T7451 and 2524-T3 aluminum alloys

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IOP Conference Series: materials science and Engineering 2020年第2期768卷

High cycle fatigue properties of 7050-T7451 and 2524-T3 aluminum alloys at three stress ratios R=-1, 0.06, and 0.5 were experimentally studied, in which the axial stress control method was used to measure the funnel-shaped and iso-section specimens, with a MTS electro-hydraulic test system. Stress-life data were obtained and equivalant stress-life curves were plotted based on the equivalent stress model. Results showed that as for 7050-T7451 and 2524-T3 aluminum alloys, stress-life curves obtained with two kinds of specimens basically agreed, and effects of the specimen form on high cycle fatigue properties of these two aluminum alloys can be neglected.

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Gaseous molecules-mediated electrochemical exfoliation of halogenated MXenes and its boosting in wear-resisting tribovoltaic devices

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Nature communications 2025年第1期16卷 5051页

作者： Qi Fan Minghua Chen Longyi Li Minghui Li Chuanxiao Xiao Tianci Zhao Long Pan Ningning Liang Qing Huang Lijing Yu Laipan Zhu Michael Naguib Kun Liang Zhejiang Key Laboratory of Data-Driven High-Safety Energy Materials and Applications Ningbo Key Laboratory of Special Energy Materials and Chemistry Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China. University of Chinese Academy of Sciences 19 A Yuquan Rd Shijingshan District Beijing 100049 P. R. China. Beijing Key Laboratory of Micro-nano Energy and Sensor Center for High-Entropy Energy and Systems Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 101400 P. R. China. Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China. Ningbo New Materials Testing and Evaluation Center Co. Ltd Ningbo 315201 P. R. China. School of Physics and Optoelectronic Engineering Beijing University of Technology Beijing 100124 P. R. China. Key Laboratory of Advanced Metallic Materials of Jiangsu Province School of Materials Science and Engineering Southeast University Nanjing 211189 P. R. China. Qianwan Institute of CNITECH Ningbo 315201 P. R. China. Key Laboratory of Materials and Surface Technology (Ministry of Education) Sichuan Energy Equipment Intelligent Engineering Research Center School of Materials Science and Engineering Xihua University Chengdu 610039 P. R. China. ljyu@***. University of Chinese Academy of Sciences 19 A Yuquan Rd Shijingshan District Beijing 100049 P. R. China. zhulaipan@***. Beijing Key Laboratory of Micro-nano Energy and Sensor Center for High-Entropy Energy and Systems Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 101400 P. R. China. zhulaipan@***. Department of Physics and Engineering Physics Tulane University New Orleans LA 70118 USA. Zhejiang Key Laboratory of Data-Driven High-Safety Energy Materials and Applications Ningbo Key Laboratory of Special Energy Materials and Chemistry Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sc

Two-dimensional transition metal carbides and/or nitrides (MXenes), especially their few-layered nanosheets, have triggered burgeoning research attentions owing to their superiorities including extraordinary electrical conductivity, accessible active surface, and adjustable processability. Molten salts etching route further achieves their controllable surface chemistry. However, the method encounters challenges in achieving few-layered structures due to more complex delamination behaviors. Herein, we present an efficient strategy to fabricate Cl- or Br-terminated MXene nanoflakes with few-layers, achieved by electrochemical intercalation of Li ions and concomitant solvent molecules from the electrolyte solution, with gaseous propylene molecules to disrupt interlayer forces. By controlling cut-off voltages, the optimal protocol results in nanosheets with a recovery rate of ~93% and preserved surface chemistry. The resultant MXenes dispersions were employed as lubricants to enhance tribovoltaic nanogenerators, where TiCBr displayed superior electrical output. These findings facilitate the understanding of MXenes' intrinsic physical properties and enable the nanoengineering of advanced electronic devices.

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Crack analysis of blades on turbine blisks 14

Crack analysis of blades on turbine blisks

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14th International Conference on Fracture, ICF 2017

作者： He, Yuhuai Liu, Liyu Jiang, Tao Liu, Xinling AECC Beijing Institute of Aeronautical Materials China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation China Beijing Key laboratory of Aeronautical Materials Testing and Evaluation China

Some blades of turbine blisks of casting superalloy cracked during testing. In order to find out the failure mode and cause, macro observation, fracture surface analysis and microstructure examination were carried out. Finally, according to the failure mode and cause, some preventive measures were put forward. © 2017 Chinese Society of Theoretical and Applied Mechanics. All Rights Reserved.

关键词： Surface analysis

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Effect on interface stress distribution of different defects and cracking mechanism 14

Effect on interface stress distribution of different defects...

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14th International Conference on Fracture, ICF 2017

作者： Liu, Xinling Tao, Chunhu Wang, Tianyu AECC Beijing Institute of Aeronautical Materials China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation China Beijing Key laboratory of Aeronautical Materials Testing and Evaluation China

The different inclusions were assumed based on their elasticity modulus E, such as hard inclusion (with bigger E than matrix), soft inclusion (with smaller E than matrix), and hole (with E is 0). The results show that the elasticity modulus is a major factor affecting the stress distribution near the interface. The cracking mechanism was analyzed on the basis of interface stress distribution between the defect and matrix. Interface stress is the main destruction parameter to token the damage near the matrix when the interface binding force is small. Maximum main stress and maximum plastic strain of matrix are main destruction parameters to token the damage near the interface when the interface binding is large. © 2017 Chinese Society of Theoretical and Applied Mechanics. All Rights Reserved.

关键词： Elasticity

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Failure analysis of slipping shoes in hydraulic pump 14

Failure analysis of slipping shoes in hydraulic pump

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14th International Conference on Fracture, ICF 2017

作者： Liu, Xin-Ling Zhao, Kai He, Yu-Huai AECC Beijing Institute of Aeronautical Materials China Aviation Key Laboratory of Science and Technology Materials Testing and Evaluation China Beijing Key laboratory of Aeronautical Materials Testing and Evaluation China

Some Slipping shoe was detected failure during the test. Overall view damage morphology, wear marks and fracture surface were observed and analyzed. Energy spectrum analysis and microstructure of the materials were tested. The failure mode and causes were given. The results show that the failure mode of hydraulic pump is wear and the failure mode of spline axes is overload fracture. Bad welding quality is the main failure cause. Wearable layers dropped during the test and leaded to serious wear. Large load was the main failure cause for spline axes. © 2017 Chinese Society of Theoretical and Applied Mechanics. All Rights Reserved.

关键词： Morphology

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Influence of Inclusions' Position on Stress Distribution of Inclusion-matrix Interface

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IOP Conference Series: materials science and Engineering 2019年第3期688卷

作者： Kai Zhao Tian-Yu Wang AECC Beijing Institute of Aeronautical Materials Beijing 100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing 100095 China Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation Aero engine corporation of China Beijing 100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing 100095 China

In this paper, the influence of inclusions' position on stress & strain distribution was researched when inclusions were same size and shape. The finite element method was used to study the position effect of inclusions in the FGH95 P/M superalloys. The shape of inclusions was simplified rotundity in the model. The influence of inclusions which was on the surface, in the sub-surface and in the basic material on stress & strain distribution was studied. There were two cases, the inclusion connected basic material tightly and there was a hole between the inclusion and the basic material. The change rule of interfacial stress & strain distribution caused by the variation of inclusions' position was given.

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