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Effects of aging treatment on the microstructure and superelasticity of columnar-grained Cu71Al18Mn11 shape memory alloy

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International Journal of Minerals,Metallurgy and Materials 2016年第10期23卷 1157-1166页

作者： Ji-li Liu Hai-you Huang Jian-xin xie Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Beijing 100083 China Department of Mechanics and Engineering Structure Wuhan University of Technology Wuhan 430070 China

The effect of aging treatment on the superelasticity and martensitic transformation critical stress in columnar-grained Cu_（71）Al_（18）Mn_（11） shape memory alloy（SMA） at the temperature ranging from 250°C to 400°C was investigated. The microstructure evolution during the aging treatment was characterized by optical microscopy, scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The results show that the plate-like bainite precipitates distribute homogeneously within austenitic grains and at grain boundaries. The volume fraction of bainite increases with the increase in aging temperature and aging time, which substantially improves the martensitic transformation critical stress of the alloy, whereas the bainite only slightly affects the superelasticity. This behavior is attributed to a coherent relationship between the bainite and the austenite, as well as to the bainite and the martensite exhibiting the same crystal structure. The variations of the martensitic transformation critical stress and the superelasticity of columnar-grained Cu_（71）Al_（18）Mn_（11） SMA with aging-temperature and aging time are described by the Austin-Rickett equation, where the activation energy of bainite precipitation is 77.2 kJ ·mol1. Finally, a columnar-grained Cu_（71）Al_（18）Mn_（11） SMA with both excellent superelasticity（5%-9%） and high martensitic transformation critical stress（443-677 MPa） is obtained through the application of the appropriate aging treatments.

关键词： copper aluminum manganese alloys shape memory effect columnar grains aging bainite superelasticity

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Structure design of high-performance Cu-based shape memory alloys

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Rare Metals 2015年第9期34卷 607-624页

作者： Jian-xin xie Ji-Li Liu Hai-You Huang State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing Laboratory of Metallic Materials and Processing for Modern Transportation

The effects of various structure factors on the properties(superelasticity mainly) of Cu-based shape memory alloys(SMAs) were systematically evaluated in this review article through literatures combining with our work. It is concluded that besides the decisive role of grain orientation, the grain boundary(GB) characteristics also play important roles in the superelasticity, which include GB area, GB type, GB morphology and GB direction in descending order of the effect significance. According to the above results, the prior principles of structure design are proposed for high-performance Cu-based SMAs from most to least important:(1) obtaining grain orientation with high phase transformation strain;(2) increasing grain size or reducing GB area;(3) obtaining straight low-energy GBs, especially low-angle GBs;(4) trying to make GB direction parallel to external stress. Consistent with the main or all principles, the bamboo-like-grained and columnar-grained(CG) Cu-based SMAs show excellent comprehensive properties.

关键词： Cu-based shape memory alloy Superelasticity Cu–Al–

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AIEgen containing side-chain liquid crystalline polymers: Photoluminecence or photothermal, which dominate?

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Nano Research 2022年第10期15卷 9334-9340页

作者： Lei Tao He-Lou xie xin Qi Jun Song Hong xin Zhen-Qiang Yu College of Chemistry and Environmental Engineering Institute of Low-dimensional Materials Genome InitiativeShenzhen UniversityShenzhen 518060China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518071China Key Lab of Environment-friendly Chemistry and Application in Ministry of Education College of ChemistryXiangtan UniversityXiangtan 411105China

Why many luminescent liquid crystalline polymers(LLCPs)containing aggregation-induced emission luminogen(AIEgen)show weak emission is a question still to be ***,a series of LLCPs(α-Pns,n=4,8,and 12)with polynorbornene as main chain and twoα-dicyanodistyrylbenzene(α-DCS)as side chain are successfully synthesized to solve this *** scanning calorimetry(DSC),polarized light microscopy(PLM),one-dimentional(1D),two-dimentional(2D)middle-angle and wide-angle X-ray scattering(MAXS and WAXS)results demonstrate that the polymers form smectic A(SmA)phase with the side chains interdigitated packed within the smectic ***,the photophysical properties ofα-Pns were investigated by ultraviolet-visible(UV-vis)absorption,steady state and time-resolved spectroscopy,and photothermal *** show that the polymers are AIE active,but emit weak *** emission peak ofα-Pns film red-shift from 473 to 531 nm,the quantum yield gradually increases from around 1.6%to 14.7%,and the photothermal conversion efficiency decreases from 39%to 19%with the alkyl tail length *** photothermal effect,but not photoluminescence,dominates the excited state relaxation.

关键词： luminescent liquid crystalline polymers dicyanodistyrylbenzene smectic A structure alkyl tail dependence photothermal conversion

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Effect of compression direction on the dynamic recrystallization behavior of continuous columnar-grained CuNi10Fe1Mn alloy

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International Journal of Minerals,Metallurgy and Materials 2015年第8期22卷 851-859页

作者： Yong-kang Liu Hai-you Huang Jian-xin xie Key Laboratory for Advanced Materials Processing of the Ministry of Education Institute of Advanced Materials and Technology University of Science and Technology Beijing Beijing Laboratory of Metallic Materials and Processing for Modern Transportation

The dynamic recrystallization（DRX） behavior of continuous columnar-grained（CCG） Cu Ni10Fe1 Mn alloy was investigated by hot compression along the solidification direction（SD） and perpendicular to the solidification direction（PD）. Specimens were compressed to a true strain of 0.8 at temperatures ranging from 25°C to 900°C and strain rates ranging from 0.01 to 10 s-1. The results indicate that DRX nucleation at grain boundaries（GBs） and DRX nucleation at slip bands（SBs） are the two main nucleation modes. For SD specimens, C-shaped bending and zig-zagging of the GBs occurred during hot compression, which made DRX nucleation at the GBs easier than that at the SBs. When ln Z ≤ 37.4（Z is the Zener–Hollomon parameter）, DRX can occur in SD specimens with a critical temperature for the DRX onset of;50°C and a thermal activated energy（Q） of 313.5 k J·mol-1. In contrast, in PD specimens, the GBs remained straight, and DRX nucleation occurred preferentially at the SBs. For PD specimens, the critical temperature is about 700°C, Q is 351.7 k J·mol-1, and the occurrence condition of DRX is ln Z ≤ 40.1. The zig-zagging of GB morphology can significantly reduce the nucleation energy at the GBs; as a result, DRX nucleation occurs more easily in SD specimens than in PD specimens.

关键词： copper–nickel alloys columnar grains compressive d

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Plasmonic Ag nanoparticles decorated MIL-101(Fe) for enhanced photocatalytic degradation of bisphenol A with peroxymonosulfate under visible-light irradiation

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Chinese Chemical Letters 2024年第1期35卷 418-423页

作者： Yan Gong Yu Ding Qi Tang Fei lian Chun Bai Ruiyi xie Haijiao xie Xu Zhao School of Energy and Environmental Engineering Hebei University of TechnologyTianjin 300401China Hangzhou Yanqu Information Technology Co. Ltd.Hangzhou 310003China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Collapse

Photocatalytic activation of peroxymonosulfate (PMS) has garnered a lot of interest in the field of wastewater treatment. Herein, a plasmonic Ag nanoparticles decorated MIL-101(Fe) hybrid was synthesized through a photodeposition process. Upon light irradiation, the Ag/MIL-101(Fe) exhibit reinforced photocatalytic activities for elimination of bisphenol A (BPA) with PMS. The optimized 2.0% Ag/MIL-101(Fe) composite presented the highest photocatalytic activity with kinetic constant k of 0.102 min-1, which was about 10-fold of the pristine MIL-101(Fe). Loading of plasmonic Ag into MIL-101(Fe) boosts photoinduced carrier separation and accelerates PMS activation to generate strong oxidative radicals. Photoelectrochemical tests and multiple spectroscopic studies confirmed the promoted charge carrier separation and transfer capability of Ag/MIL-101(Fe). Combining the results of radical trapping experiments and electron spin resonance (ESR), the formed SO4·-, ·OH, ·O2- and 1O2 had a significant role in the photocatalytic process. According to intermediate study, the degradation pathway was studied, and the possible mechanism was proposed.

关键词： Photocatalysis MOF Peroxymonosulfate Plasmonic Ag BPA

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Recent advances in condensed-matter physics in China

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National Science Review 2017年第2期4卷 153-154页

作者： xin-Cheng xie Lu Yu School of Physics Peking University NSR Institute of Physics Chinese Academy of Sciences

Over the past decade,research in condensed-matter physics in China has progressed *** and more outstanding physicists from China are gaining global recognition with cutting-edge research *** capture a glimpse of the

关键词： In more Recent advances in condensed-matter physics in China PKU

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An evaluation method of contribution rate based on fuzzy Bayesian networks for equipment system-of-systems architecture

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Journal of Systems Engineering and Electronics 2023年第3期34卷 574-587页

作者： XU Renjie LIU xin CUI Donghao xie Jian GONG Lin School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China College of Systems Engineering National University of Defense TechnologyChangsha 410073China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314019China

The contribution rate of equipment system-of-systems architecture(ESoSA)is an important index to evaluate the equipment update,development,and architecture *** the traditional ESoSA contribution rate evaluation method does not make full use of the fuzzy information and uncertain information in the equipment system-of-systems(ESoS),and the Bayesian network is an effective tool to solve the uncertain information,a new ESoSA contribution rate evaluation method based on the fuzzy Bayesian network(FBN)is ***,based on the operation loop theory,an ESoSA is constructed considering three aspects:reconnaissance equipment,decision equipment,and strike ***,the fuzzy set theory is introduced to construct the FBN of ESoSA to deal with fuzzy information and uncertain ***,the fuzzy importance index of the root node of the FBN is used to calculate the contribution rate of the ESoSA,and the ESoSA contribution rate evaluation model based on the root node fuzzy importance is ***,the feasibility and rationality of this method are validated via an empirical case study of aviation *** with traditional methods,the evaluation method based on FBN takes various failure states of equipment into consideration,is free of acquiring accurate probability of traditional equipment failure,and models the uncertainty of the relationship between *** proposed method not only supplements and improves the ESoSA contribution rate assessment method,but also broadens the application scope of the Bayesian network.

关键词： equipment system-of-systems architecture(ESoSA) contribution rate evaluation fuzzy Bayesian network(FBN) fuzzy set theory

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Refractive accuracy after intraocular lens implantation in pediatric cataract

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International Journal of Ophthalmology(English edition) 2012年第4期5卷 473-477页

作者： Tan Long, Li-xin xie Department of Ophthalmology People's Hospital of Wuhan University Wuhan 430060 Hubei Province China Shandong Eye Institute Qingdao 266071 Shandong Province China

AIM: To analyze the factors that influence the prediction error (PE). after intraocular lens (IOL) implantation in pediatric cataract. METHODS: The medical records of cataract patients of no more than 14 years old who had primary IOL implantation were reviewed from 2006 to 2010. The PE, absolute value of PE (APE), and predictability between in different axial length, mean corneal curvature, corneal astigmatism, and age at the surgery were analyzed. RESULTS: Seventy-five children (119 eyes) were included, with a mean age of (5.09 +/- 2.54) years. At the follow-up of (1.19 +/- 0.69) months, the mean postoperative PE was (-0.22 +/- 1.12) D, and APE was (0.87 +/- 0.73)D. The PE in eyes with an axial length > 20mm but <= 22mm were significantly under-corrected than that in eyes with longer axis, and the APE in eyes with an axial length <= 20mm was more obvious compared with the others. The correlations between PE and axial length, as well as corneal astigmatism, and between APE and axial length were significant. The predictability was significantly poorer in the eyes with an axial length <= 20mm than the others. CONCLUSION: The axial length is closely related with the PE after IOL implantation in pediatric cataract patients, especially when it is <= 20mm, PE is more significant. The formula that is more suitable to very short axial length should be explored.

关键词： cataract children refraction intraocular lens

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GMDH-Based Outlier Detection Model in Classification Problems

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Journal of Systems Science & Complexity 2020年第5期33卷 1516-1532页

作者： xie Ling JIA Yanlin XIAO Jin GU xin HUANG Jing School of Medical Information Engineering Zunyi Medical UniversityZunyi 563006China Business School Sichuan UniversityChengdu 610064China Soft Science Institute Sichuan UniversityChengdu 610064China School of Public Administration Sichuan UniversityChengdu 610064China

In many practical classification problems,datasets would have a portion of outliers,which could greatly affect the performance of the constructed *** order to address this issue,we apply the group method of data handin neural network in outlier *** study builds a GMDH-based outlier detectio *** model first implements feature selection in the training set L using GMDH neural *** a new training set L can be obtained by mapping the selected key feature ***,a linear regression model can be constructed in the set L by ordinary least squares ***,it eliminates a sample from the set L randomly every time,and then rebuilds a linear regression ***,outlier detection is realized by calculating Cook’s distance for each *** different customer classification datasets are used to conduct *** show that GOD model can effectively eliminate outliers,and compared with the five existing outlier detection models,it generally performs significantly *** indicates that eliminating outliers can effectively enhance classification accuracy of the trained classification model.

关键词： Classification problem Cook’s distance feature selection GMDH outlier detection

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Multiscale observation of Li plating for lithium-ion batteries

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Rare Metals 2021年第11期40卷 3038-3048页

作者： xin-Lei Gao xin-Hua Liu Wen-Long xie Li-Sheng Zhang Shi-Chun Yang School of Transportation Science and Engineering Beihang UniversityBeijing 100191China

As the most hazardous side reaction,Li plating poses high risks of undermining electrochemical performance of Li-ion batteries by accelerating *** some extreme abuse conditions,Li plating can even jeopardize safety performance and induce catastrophic results like thermal ***,multiscale observation of Li plating is of great significance for understanding the internal mechanisms and early detection of Li *** this mini-review,the recent progress of formation mechanisms of plated metallic lithium was ***,the in situ and ex situ observation methods of macroscopic,microscopic and atomic level were *** electrode provides a promising tool for real-time monitoring of anode potential,which is the critical factor of Li plating,showing great potentials in cloudbased battery management ***,some perspectives for future researches on Li plating observation and corresponding utilizations in developing Li plating free control strategies were proposed.

关键词： Lithium-ion battery Li plating Multiscale observation Reference electrodes

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