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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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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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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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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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Vibration-based fatigue damage and fracture investigation of a special sheet specimen with surface notch 14

Vibration-based fatigue damage and fracture investigation of...

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14th International Conference on Fracture, ICF 2017

作者： Xu, Wei Yang, Xianfeng Guo, Guangping Tao, Chunhu Aviation Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing Institute of Aeronautical Materials Beijing100095 China

Metallic annular disc is a type of widely used components in engineering structures. The fracture resulted from cyclic loads is the main failure mode of the component. Basically, the fatigue experiments in terms of the structural components have been really difficult to be carried out. Furthermore, a notable limitation for the fatigue experiments of the annular discs is the shortage of the specimens. Accordingly, an alternative approach to obtain the fatigue properties of the metallic annular disc is to develop a prediction method integrated with fatigue test results of the segments cut from the disc. The present paper presents a vibration-based fatigue experimental study of the segments with surface notch, which are cut radially from a titanium alloy annular disc used in aeroengine. By building a closed-loop controlled vibration fatigue experimental system, the vibration-based fatigue tests are carried out to obtain the fatigue facture characteristic and the damage evolution process of the segment specimens. The failure modes of the segment specimens are analyzed finally. The results of the present investigation show that the fatigue damage process of the segment specimen has a close relationship with its natural frequency. The critical natural frequency defining the failure of the specimen can be determined from both the vibration-based experiment and a FEM model integrated with the user-define cohesive crack elements. The obtained fatigue properties results are very close to those in the condition of rotating-bending fatigue. And the fracture surface exhibits a typical single-fatigue source characteristic. © 2017 Chinese Society of Theoretical and Applied Mechanics. All Rights Reserved.

关键词： Natural frequencies

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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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Study of the Residual Stress in 2A97 Al-Li Alloy Using Different Methods

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IOP Conference Series: materials science and Engineering 2019年第2期490卷

作者： Xi Wang Changkui Liu AECC Beijing Institute of Aeronautical Materials Beijing 100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing 100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing 100095 China Key Laboratory of Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China Beijing 100095 China

The contour method and X-ray diffraction have been used to measure the quenching stress in 2A97 Al-Li alloy. The surface stresses were measured by X-ray diffraction. Besides, the 2-D distribution of stresses have been given by the contour method. The differences between the two methods can be more than 100 MPa. In addition, finite element model which is suitable for evaluation of residual stresses in this material was established. There is very good correlation between the contour method and finite element model (FEM). The differences are less than 50MPa. The model has high precision to forecast the residual stress in 2A97 Al-Li alloy.

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Deformation and fracture of long term creep of notched specimen of a single crystal nickel base super alloy 14

Deformation and fracture of long term creep of notched speci...

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14th International Conference on Fracture, ICF 2017

作者： Li, Ying Zhang, Ming Zong, Bin Yu, Hui-Chen Aviation Key Laboratory of Science and Technology on Aeronautical Materials and Evaluation Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials Beijing100095 China

Creep rupture life behavior of a nickel base superalloy of DZ125 was studied with respect to specimens with different notch shape under elevated temperature of *** result showed that the specimen with notch in the gauge length had a substantially longer life than that of specimen without notch, the bigger the stress concentration factor of Kt is, the longer creep rupture life the specimen exhibited. The SEM observation and analysis on the fractured specimen after text showed that microholes resulting in the damage of the specimen originated mostly from the central portion or portion other than boundary. Analysis was made of the stress distribution of the specimen with different shapes during test, based on which the stress rupture life of the specimen with different Kt values was normalized and a good consistency was found among the stress rupture life. © 2017 Chinese Society of Theoretical and Applied Mechanics. All Rights Reserved.

关键词： Stress concentration

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Influence of inclusions on low cycle fatigue life of P/M superalloy 14

Influence of inclusions on low cycle fatigue life of P/M sup...

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14th International Conference on Fracture, ICF 2017

作者： Zhao, Kai Liu, Xin-Ling He, Yu-Huai Tao, Chun-Hu AVIC Failure Analysis Center 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

In the range of operating the resistance to low cycle fatigue (LCF) of P/M nickel-based superalloy is one of the most important performance. In this paper the fracture features of LCF on P/M nickel-based superalloy were investigated. The study focused on macroscopic and microscopic features of LCF fractures under 650?,e=0.82%,R=0.05,0.33Hz test condition by optical microscope and SEM. The types and morphologies of failure origins were observed. The effect of position and size of inclusions on LCF were researched. A new life prediction model appropriated for this test condition was provided. The result shows that the LCF and the size of inclusion in this test condition follow the Weibull distribution. The LCF exponential decreases with the inclusion size increases. © 2017 Chinese Society of Theoretical and Applied Mechanics. All Rights Reserved.

关键词： Superalloys

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