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

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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Failure analysis of smoke lampblack machine crack

Failure analysis of smoke lampblack machine crack

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2022 International Conference on Metallurgical Engineering and Automation technology, MEAT 2022

作者： Kong, Huanping Jiang, Tao Zhao, Kai Liu, Changkui AECC Beijing Institute of Aeronautical Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Key Lab. of Sci. and Technol. on Aero. Mat. Test. and Evaluation of Aero Engine Corporation of China Beijing100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China AECC Failure Analysis Center Beijing100095 China

The smoke lampblack machine cracked in use. Through macro and micro morphology observation, energy spectrum detection, metallographic examination and finite element simulation calculation and analysis, the failure nature and reason of the smoke lampblack machine were determined. The results showed that the cracking property was corrosion fatigue, and the cracking of the smoke lampblack machine was caused by the damage of the protective layer in the vibration environment. It was suggested that the surface protection of smoke lampblack machine should be strengthened and the structural design of stress concentration should be improved. © Published under licence by IOP Publishing Ltd.

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Fatigue test fracture analysis of aircraft blade connecting pin 8

Fatigue test fracture analysis of aircraft blade connecting ...

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2022 8th International Conference on Mechanical Engineering, materials and Automation technology, MMEAT 2022

作者： Wang, Zhanbin Chen, Guoquan Jiang, Tao AECC Beijing Institute of Aeronautical Materials Beijing100095 China AVIC Harbin Aircraft Industry Group Co. LTD Heilongjiang 150066 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China

During the fatigue performance verification test of the blade simulator, a fixed connecting pin on which the splint was installed broke. In this paper, the fracture properties of the connecting pin were determined by observing the macro/micro morphology of the connecting pin and the fracture surface of the coating. By analyzing the elements, structure, hardness and relative ratio of the body and coating, the differences between the connecting pins of different blades were studied, and the fracture causes of the connecting pins were comprehensively analyzed. Based on the above experiments, the influence of coating quality on fatigue cracking is analyzed, and the improvement scheme of connecting pin is put forward. © Published under licence by IOP Publishing Ltd.

关键词： Coatings

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Anisotropy of microstructure and tensile properties of additive manufactured ZTC4 alloy 3rd

Anisotropy of microstructure and tensile properties of addit...

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3rd International Conference on materials science and Industrial Applications, MSIA 2021

作者： Wei, Zhen-Wei Xing, Wei-Jie Chen, Bing-Qing Jiang, Tao AECC Beijing Institute of Aeronautical Materials Beijing100095 China Failure Analysis Center of Aviation Industry Corporation of China Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Key Laboratory of Science and Technology on Materials Testing and Evaluation AECC Beijing100095 China

ISBN: (纸本)9783035738056

ZTC4 alloy prepared by electron beam melting was hot isostatically pressed, the macroand microstructure were characterized by stereo microscopy and optical microscopy, the tensile properties were tested and the fracture profiles were characterized using scanning electron microscopy. The results show that: The vertical deposition samples exhibit coarsen epitaxial columnar grains and the parallel samples show equiaxed grains, and microstructure are basket-weave α+β phase. The vertical deposition samples exhibit very high ultimate tensile strength and yield strength but poor ductility with elongation and shrinkage, and show generally more planar and faceted fracture morphology. The anisotropy in tensile properties is mainly due to the difference in the orientation of the columnar grains with respect to the tensile test direction, and the characteristics of the minor fracture plane are mainly related to the α colonies. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Anisotropy

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Failure analysis of sensor diaphragm cracking

Failure analysis of sensor diaphragm cracking

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2021 International Conference on Electronic materials and Information Engineering, EMIE 2021

作者： Huan-Ping, Kong De-Lin, Liu Chang-Kui, Liu AECC Beijing Institute of Aeronautical Materials Beijing China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing China Key Lab. of Sci. and Technol. on Aero. Mat. Test. and Evaluation of Aero Engine Corporation of China Beijing China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing China AECC Failure Analysis Center Beijing China

The sensor diaphragm cracked during the test project. Through macro and micro morphology observation, metallographic examination and hardness test, the diaphragm failure properties and reasons were determined. The results showed that the failure nature of the faulted diaphragm was bidirectional bending fatigue cracking. 1# crack failure was related to the greater bending stress borne at the bottom of the outermost corrugation. 2# crack failure was related to the greater stress borne by the root at the boundary between the outermost corrugation and the outer edge, the appearance of grain boundaries caused by the pickling process promoted the initiation and propagation of 2# crack. © Published under licence by IOP Publishing Ltd.

关键词： Diaphragms

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Mechanochemical transformation of fluorescent hydrogel based on dynamic lanthanide-terpyridine coordination

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Chinese Chemical Letters 2023年第3期34卷 430-433页

作者： Guangqiang Yin Jianxiang Huang Depeng Liu Rui Li Shuxin Wei Muqing Si Feng Ni Yinfei Zheng Qiu Yang Ruhong Zhou Xiaoxia Le Wei Lu Tao Chen Key Laboratory for Biomedical Engineering of Ministry of Education Ministry of China College of Biomedical Engineering and Instrument ScienceZhejiang UniversityHangzhou 310027China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China Institute of Quantitative Biology Zhejiang UniversityHangzhou 310027China Research Center for Intelligent Sensing Zhejiang LabHangzhou 311100China Ningbo New Material Testing and Evaluation Center Co. Ltd.Ningbo 315000China

As a burgeoning research field, ultrasound-responsive materials have attracted intense interest in healthcare research. However, the basic mechanism of sonochemical effect in the quasi-solid state is far from being well understood than those in the solution. Herein, we showcase mechanochemical transformations of europium(Ⅲ) complexes in a supramolecular hydrogel matrix. With the combination of labile terpyridine-europium complexes(TPY-Eu^(3+)) as mechanochromic moieties and an ultrasound-responsive fluorogen(URF) as a molecular tweezer, the hydrogel produces a notable fluorescence change in response to ultrasound. The mechanochemical transformation was elucidated by molecular dynamics(MD) simulations, and fully probed and evidenced by electrochemical experiments, X-ray photoelectron spectroscopy(XPS), and attenuated total reflectance-Fourier transform infrared(ATR-FTIR) spectroscopy.

关键词： Supramolecular hydrogel Ultrasound-responsive Mechanochemical transformation Terpyridine-europium coordination Dynamic interaction

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Quantitative characterization of heat treatment response in a single crystal nickel-based superalloy 2nd

Quantitative characterization of heat treatment response in ...

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2nd International Conference on Advanced materials, Processing and testing technology, AMPTT 2020

作者： Wei, Zhenwei Liu, Changkui Li, Yao Chen, Bingqing AECC Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation AECC Beijing100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China

ISBN: (纸本)9783035737400

To study quantitatively the effect of heat treatment on the microstructure, composition and mechanical property in a new single crystal nickel-based superalloy for industrial gas turbine (IGT) applications, the eutectic fraction, carbide fraction, and the fraction, size, shape and distribution of the γ´ phase was characterized by quantitative metallographic method, the evolution of chemical composition and hardness between core and inter dendrite was tested through EMPA and Nanoindentation. The experimental results indicate that: The eutectic fraction decreases from (0.52±0.08) % to (0.03±0.01) %. The carbides fraction decreases from (0.23±0.04) % to (0.12±0.03) %, and Feret ratio decreases from 3.21±2.54 to 2.14±0.98. The γ´ fraction increases from (55.66±4.18) % to (73.78±3.24) % in core dendritic region, from (64.82±1.44) % to (70.11±3.10) % in inter dendritic region. The γ´-size is 406±111(nm) in core dendritic region and 918±384(nm) in inter dendritic region before heat treatment, 359±69(nm) in core dendritic region and 361±57(nm) in inter dendritic region after heat treatment. The γ´-cuboidal degree is 1.08±0.20 in core dendritic region and 1.14±0.23 in inter dendritic region before heat treatment, 1.08±0.19 in core dendritic region and 1.02±0.14 in inter dendritic region after heat treatment. The solidification segregation coefficient of main segregation elements, such as Re, W, Hf, Ta, Al, and Mo, is closer to 1, with an average decrease of 27% after heat treatment. The hardness and modulus increase in core and inter dendritic, and their inhomogeneity is reduced between cores and inter dendritic. The improvement of properties result from the improvement of size uniformity and cuboidal degree of γ´, and the reduction of carbides and eutectic through element homogeneity during heat treatment. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Eutectics

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Carburized layer cracking analysis of counterweight blocks of speed controller 2

Carburized layer cracking analysis of counterweight blocks o...

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2021 2nd International Conference on Mechanical Engineering and materials, ICMEM 2021

作者： Jiang, Tao Zhang, Bing Mao, Yimeng Cheng, Jiale Shi, Xiaodong AECC Beijing Institute of Aeronautical Materials Beijing100095 China Failure Analysis Center of Aviation Industry Corporation of China 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 Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China Beijing100095 China New Era Engineering Consulting Co. Ltd. Beijing100088 China

Trace and fracture analysis, metallographic examination, residual stress testing, and material analysis were carried out, coupled with examining the failure timeline, to analyze the cracking problem of 12CrNi3A steel counterweight blocks under multi-factor coupling. The results show that the cracks of the counterweight blocks are intergranular microcracks in the carburized layer and they are delayed cracks under the joint action of microstructure stress, grinding stress and hydrogen. The delayed cracking of the counterweight blocks is mainly related to abnormal hydrogen absorption during surface treatment and poor grinding quality. The obvious microstructure segregation in raw material and the thicker carburized layer promoted the cracking. The following measures should be comprehensively taken to prevent such failure: strictly controlling raw material quality, hydrogen absorption and stress, as well as increasing the processes to remove hydrogen, reduce stress and stabilize microstructure. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Grinding (machining)

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3DStrainOrientationCalculator: a 3D diffraction data analysis tool for single-crystal substructure information extraction

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Journal of Applied Crystallography 2025年第3期58卷 1050-1060页

作者： Pucong Sheng Shengyi Zhong Arsen Goukassov Baihua Wang Hao Lin Nan Li Wei Huang Shanghai Jiao Tong University SJTU Paris Elite Institute of Technology Shanghai 200240 People's Republic of China Shanghai Jiao Tong University School of Materials Science and Engineering Shanghai 200240 People's Republic of China National Key Laboratory of Neutron Science and Technology Shanghai People's Republic of China CEA-CNRS CE-Saclay Laboratoire Léon Brillouin Gif-sur-Yvette 91191 France AECC Beijing Institute of Aeronautical Materials Beijing People's Republic of China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing People's Republic of China Aero Engine Corporation of China Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing People's Republic of China HiSilicon Technologies Co. Ltd Shanghai 201206 People's Republic of China

Neutron diffraction is a crucial non-destructive technique for obtaining statistical information on the bulk properties of engineering materials. The program 3DStrainOrientationCalculator ( 3DSOC ) is an innovative analytical tool designed to extract substructure information, including lattice strain and subgrain orientation, from single crystals (SCs) using monochromatic neutron diffractometer data. By separating subgrain diffraction via rocking curve analysis and employing 2D curve fitting on original diffraction data, 3DSOC accurately determines the diffraction intensity of individual subgrains while minimizing the impact of scanning step size on the final fitting results. It reduces the standard deviation of the fitting result's statistical error from the order of 10 −3 to around 10 −5 . Additionally, 3DSOC extends its capabilities to the analysis of dual-phase SCs, where the lattice parameters of both phases are maintained with an accuracy of 10 −4 nm, comparable to conventional methods. This study applies 3DSOC to SiC SCs and Ni-based SC superalloys, measured using two different diffractometers, and discusses the resulting improvements.

关键词： neutron diffraction 3DSOC single-crystal studies subgrain properties two-dimensional curve fitting computer programs

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Predicting New Single/Multiphase Structure High Entropy Alloys by Pattern Recognition Network

SSRN

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SSRN 2022年

作者： Wang, Jiayu Liu, Ke Li, Xing Shi, Ruya Guo, Xuan Tian, Wenhan Yu, Huichen Wu, Su Jun School of Materials Science and Engineering Beihang University Beijing100191 China Science and Technology on Advanced High Temperature Structural Materials Laboratory AECC Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing Institute of Aeronautical Materials Beijing100095 China Intl. Research Center for Advanced Structural and Biomaterials China

The phase structures of a dataset of 634 set high entropy alloys (HEAs) were predicted by machine learning methods and classified into four categories: bcc, fcc, bcc+fcc and others (containing intermetallic compounds and other structural alloys). The algorithm was a Pattern Recognition Network (PRN) using the cross-entropy as loss function, which could predict the phase formation probability of HEAs. The PRN algorithm was proved to be over 87% accurate on the test data. With the increase of Al content in AlxCoCu6Ni6Fe6 and AlxCoCrCuNiFe HEAs, the transformation from fcc to fcc+bcc and then to bcc structure was successfully predicted by the PRN algorithm. Meanwhile, the AlxCoCu6Ni6Fe6 (x=1,3,6,9) HEAs were also prepared and characterized, the experimental results showed that the phase structures were highly consistent with the prediction. © 2022, The Authors. All rights reserved.

关键词： Phase structure

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