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Coarsening behavior of γ' particles in a nickel-base superalloy

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Rare metals 2009年第2期28卷 197-201页

作者： li, hongyu Zuo, lingli song, xiping wang, yanli chen, guoliang state key laboratory for advanced metals and materials University of Science and Technology Beijing Beijing 100083 China

The coarsening behavior of γ particles in a nickel-base superalloy FGH95 was investigated by means of experimental observations and growth kinetics calculations. The results show that when aging at 1000,1080 and 1140°C for different times,the relation of average particle size to time obeys the cube law ( a /2)3= kt,where k is 15.49 × 103,77.5 × 103 and 230.04 × 103 nm3/min,respectively. The particle size distributions are better fit to the LSW theoretical distributions when aging at 1000°C within 1440 min....

关键词： nickel-base superalloys γ particles coarsening behavior particle size distribution activation energy

New Phase Ti_3Co_2Si in the Ti-Co-Si Ternary System at 1100℃

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Journal of materials science & technology 2000年第1期16卷 91-93页

作者： Xianhua HU, guoliang chen, Cinca Ion and Kequan NI (state key lab. for advanced metals and materials, university of science and technology beijing, beijing 100083, china) state key lab. for advanced metals and materials University of Science and Technology Beijing Beijing 100083 China

A new phase with the appropriate composition of Ti_3Co_2Si is found to exist at 1100℃. The X-ray diffraction of this phase can not be indexed by any other phase in the Ti-Co-Si ternary system and show this phase to b... 详细信息

关键词： Ti Co New Phase Ti3Co2Si in the Ti-Co-Si Ternary System at 1100 Si

Deformation-induced α_2/γ Interfaces in a Hot-deformed Ti-45Al-10Nb Alloy

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Journal of materials science & technology 1998年第2期14卷 132-138页

作者： Jinguo wang lichun ZHANG and guoliang chen (state key lab. for advanced metals and materials, university of science and technology beijing, beijing 100083, china )Henqiang YE(lab. of Atomic Imaging of Solids, Institute of Metal Research, Chinese Academy state key lab. for advanced metals and materials University of Science and Technology Beijing Beijing 100083 China lab. of Atomic Imaging of Solids Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The structure change of α2/γ interface in a Ti-45Al-10Nb alloy induced by hot deformation was investigated by conventional and high-resolution transmission eIectron microscopy. Two types of hot deformation induced special α2/γ intedeces, coherent intedeces with high density of ledges and semi-coherent α2/γ intedeces were found to be due to the absorption of mobile dislocations into the α2/γ inteface. For the misoriented semi-coherent α2/γ interfaces, the densities of dislocation ledges increase with the misoriented angle between (111)γ and (0001)α2 planes, and 1/3[111] Frank partial dislocations were involved in the dislocation ledges. Formation mechanism of these deformation-induced α2/γ interfaces was discussed to be related to the role of α2/γ interface5 adjusting the deformation as a dislocation sink absorbing the slipping dislocations in the γ phase

关键词： Al Ti Interfaces in a Hot-deformed Ti-45Al-10Nb Alloy Deformation-induced

EAM Analysis of the Lattice Parameter Effect in Order-Disorder Transformation

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Journal of university of science and technology beijing 2001年第3期8卷 189-194页

作者： Timoth■e Nsongo, Xiaodong Ni, guoliang chen state key laboratory for advanced metals and materials, university of science and technology beijing, beijing 100083, china Faculty of science, Physics Department, P. O. Box 69, Brazzaville (CONGO) Applied Scie state key lab. for Adv. Met. Mat. Univ. of Sci. and Technol. Beijing Beijing 100083 China

The embedded atom method (EAM) was used to theoretically analyze the effect of the lattice parameter variation on the order-disorder transformation in binary alloys. Based on EAM, it is found that only one kind of order-disorder transition (second-order transition) exists for AB alloy. Three groups of order-disorder transformation can be observed for the A(3)B or AB(3) compounds. For group I, the order-disorder is a completely first-order transition. For group II, the order-disorder transformation is a classical first-order transition. For group III, the order-disorder transformation is found to be a second-order transition. The lattice parameter variations have a significant effect on E-2 coefficient, which is related to the ordering energy. These results are in good agreement with experiments.

关键词： order-disorder transformation embedded atom method (EAM) phase transformation binary alloy

Application of the Embedded-atom Method to liquid Binary Cu-Ni Alloys

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Journal of materials science & technology 1997年第2期13卷 117-122页

作者： Hongbo liU Kuiying chen Zhuangqi HU (state key lab. of RSA, Institute of Metal Research, Chinese Academy of sciences, Shenyang 110015, china)Geying AN(School of materials science and Engineering, Harbin Institute of technology, Harbin 150001, china) state key lab. of RSA Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China School of materials science and Engineering Harbin Institute of Technology Harbin 150001 China

A simple analytic embedded-atom model of monoatoms that includes more than nearest neighbours has been extended to study properties of binary liquid Cu-Ni alloys, here the two-body potential between different species of atoms is taken as a function of the two-body potential for the pure metals with a unique form which yields alloy models with the same invariance to electron density transformations as monoatomic models. Faber-Ziman structure factors have been computed by molecular dynamics simulation on the base of this model. The results are in good agreement with experimental data given by Waseda, thus supporting the overall validity of the approach, especially for cross potential of Cu-Ni pair. Further, a detailed description of structure of binary liquid Cu-Ni alloys with different compositions have been performed using pair analysis and bond orientational order method etc., and then the chemical short range order has also been examined to reveal the structural characterization.

关键词： Rev li Application of the Embedded-atom Method to liquid Binary Cu-Ni Alloys Cu Ni

Efficient epoxidation of propylene over non-noble nickel-based catalyst promoted by alkali metals

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science china Chemistry 2024年第11期67卷 3697-3705页

作者： Wenqian li Wanting li Xinxin Cao Longfei chen Yibo Qin Yanfeng Zhu Yanfei Zhang Gai Miao lingzhao Kong Jiong li Xinqing chen state key laboratory of Low Carbon Catalysis and Carbon Dioxide Utilization CAS Key Laboratory of Low-carbon Conversion Science and Engineering Shanghai Advanced Research Institute Chinese Academy of Sciences university of Chinese Academy of sciences School of Environmental science and Engineering Suzhou University of Science and Technology Shanghai Synchrotron Radiation Facility Zhangjiang National Lab Shanghai Advanced Research Institute Chinese Academy of Sciences

The application of non-noble metal catalysts in the catalytic direct gas-phase epoxidation of propylene with H2and O2to produce propylene oxide is valuable and challenging. The introduction of alkali metal promoters is one of the effective methods to improve the catalytic activity of catalysts. Herein, a series of alkali metal（li, Na, K, Rb, and Cs）-promoted Ni/TS-1 catalysts were prepared to deeply understand the effect of alkali metals on the structure-activity relationship for gas-phase epoxidation of propylene. Among them, the Na-Ni/TS-1 catalyst exhibits the highest catalytic activity(propylene conversion of 7.35% and PO formation rate of 157.9 g h-1kgcat-1) and the best stability（long-term stability exceeding 140 h at 200 °C）. X-ray absorption and photoelectron spectroscopy revealed that the electronic structure of Ni can be tuned by the addition of alkali metal ***3-TPD-MS, CO2-TPD-MS, and C3H6-TPD-MS results indicate that the acidity of the catalyst can also be adjusted by the introduction of alkali metal, whereas the Na-Ni/TS-1 catalyst exhibits the strongest C3H6adsorption capacity. Thus, the suitable acid-base properties, unique electronic properties of Ni species, and the strongest propylene adsorption capacity resulted in improved propylene gas-phase epoxidation activity of Na-Ni/TS-1 catalyst. This study not only provides a new strategy for the practical application of nickel-based catalysts in the gas-phase epoxidation of propylene but also provides insights into the promoting effect of alkali metals.

关键词： propylene epoxidation Ni/TS-1 catalyst alkali metal precipitating agents

Phase-stable wide-bandgap perovskites enabled by suppressed ion migration

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Journal of Energy Chemistry 2024年第9期96卷 120-128页

作者： Zhiyu Gao Yu Zhu Jingwei Zhu Cong chen Zongjin Yi Yi Luo Yuliang Xu Kai Wu Tianshu Ma Fangfang Cao Zijun chen Fang Yao Juncheng wang Wenwu wang Chuanxiao Xiao Hao Huang Hongxiang li Qianqian lin Pei cheng Changlei wang Xia Hao Guanggen Zeng Dewei Zhao College of materials science and Engineering&Institute of New Energy and Low-Carbon technology&Engineering Research Center of Alternative Energy materials and Devices Ministry of EducationSichuan UniversityChengdu 610065SichuanChina School of Optoelectronic science and Engineering&Collaborative Innovation Center of Suzhou Nano science and technology Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of ChinaSoochow UniversitySuzhou 215006JiangsuChina Ningbo Institute of materials technology and Engineering Chinese Academy of SciencesNingbo 315201ZhejiangChina Ningbo New materials Testing and Evaluation Center Co.Ltd Ningbo 315201ZhejiangChina state key laboratory of Featured Metal materials and life-cycle Safety for Composite Structure&School of Resources Environment and MaterialsGuangxi UniversityNanning 530004GuangxiChina key lab of Artificial Micro-and Nano-Structures of Ministry of Education of china School of Physics and TechnologyWuhan UniversityWuhan 430072HubeiChina College of Polymer science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065SichuanChina

Wide-bandgap(>1.7 eV)perovskites suffer from severe light-induced phase segregation due to high bromine content,causing irreversible damage to devices ***,the strategies of suppressing photoinduced phase segregation and related mechanisms have not been fully ***,we report a new passivation agent 4-aminotetrahydrothiopyran hydrochloride(4-ATpHCl)with multifunctional groups for the interface treatment of a 1.77-eV wide-bandgap perovskite film.4-ATpH^(+)impeded halogen ion migration by anchoring on the perovskite surface,leading to the inhibition of phase segregation and thus the passivation of defects,which is ascribed to the interaction of 4-ATpH^(+)with perovskite and the formation of low-dimensional ***,the champion device achieved an efficiency of 19.32%with an open-circuit voltage(V_(OC))of 1.314 V and a fill factor of 83.32%.Moreover,4-ATpHCl modified device exhibited significant improved stability as compared with control *** target device maintained 80%of its initial efficiency after 519 h of maximum power output(MPP)tracking under 1 sun illumination,however,the control device showed a rapid decrease in efficiency after 267 ***,an efficiency of 27.38%of the champion 4-terminal all-perovskite tandem solar cell was achieved by mechanically stacking this wide-bandgap top subcell with a 1.25-eV low-bandgap perovskite bottom subcell.

关键词： Wide-bandgap perovskite Phase segregation lon migration Interface post-treatment All-perovskite tandems

Phase evolutions of two kinds of co-precipitated indium-tin oxide pre-cursors by heat-treatment

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Rare metals 2005年第2期24卷 146-150页

作者： chenShuguang lichenhui XIONGWeihao liULangming wangHui ZhnzhouSmelterGroupCo.Ltd. Zhuzhou412004China statekeylabforPlasticFormingSimulation＆DieandMouldtechnology HnazhongUniversityofScienceandTechnologyWuhan430074China／／ZhnzhouSmelterGroupCo.Ltd.Zhuzhou412004China statekeylabforPlasticFormingSimulation＆DieandMouldtechnology HnazhongUniversityofScienceandTechnologyWuhan430074China

Two kinds of indium-tin oxide (ITO) precursors, cubic indium hydroxide(In(OH)_3) and orthorhombic indium oxide hydroxide (InOOH), were prepared by a co-precipitationmethod. With the help of X-ray diffraction (XRD), thermo-gravimetric analysis (TGA) and differentialthermal analysis (DTA), phase evolutions from cubic In(OH)_3 and orthorhombic InOOH to cubic ITOsolid solution and rhombohedral ITO solid solution by heat-treatment had been comprehensivelyinvestigated. The transformation from cubic In(OH)_3 to cubic ITO solid solution started as low as150 deg C and ended at about 300 degC, and it exhibited an endothermic behavior. The transformationfrom orthorhombic InOOH to rhombohedral ITO solid solution started at 220 deg C and ended at about430 deg C. Moreover, this transformation was composed of two processes: the one was the dehydrationof InOOH exhibiting an endothermic behavior and the other was the transformation from dehydrationproducts to rhombohedral ITO solid solution exhibiting a strong exothermic behavior. RhombohedraliTO solid solution was metastable in air and it would transform to cubic ITO solid solution byheat-treatment. The transformation from rhombohedral ITO solid solution to cubic ITO solid solutionstarted at 578 deg C and ended below 800 deg C, and it exhibited a weak exothermic behavior.

关键词： inorganic and nonmetallic materials crystal structure X-ray techniques indium-tin oxide

CrN supported by carbon nanosheets as efficient catalysts toward oxygen reduction reaction and Zn-air batteries

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Rare metals 2024年第10期43卷 4973-4981页

作者： Ya-Ting Zhang Fan Zhang Zhe Lu Jun-Ming Luo Su-Yang Feng Qi wang Hui chen Hao-Ming Wu Zheng-Pei Miao Bin Chi Neng Yu cheng-Hang You Jing li Xin-Long Tian School of Chemistry and Chemical Engineering School of Marine Science and EngineeringHainan Provincial Key Lab of Fine ChemistryHainan University state Power Investment Group Hainan Electric Power Co.Ltd. key laboratory of Fuel Cell technology of Guangdong Province Shenzhen Automotive Research Institute Beijing Institute of Technology state key laboratory of Nuclear Resources and Environment East China University of Technology

Exploring non-precious efficient oxygen reduction reaction （ORR） catalysts is of great significance to fuel cells and Zn-air batteries （ZABs）.CrN is a theoretically promising ORR catalyst,but its potential needs to be unlocked by proper supports that provide high conductivity and high exposure of active *** this work,we introduce a novel synthesis of carbon nanosheets-supported CrN nanoparticles （CrN/C） by annealing the mixture of CrCl3,1,10-phenanthroline and melamine via a two-step *** prepared CrN/C materials show good ORR activity and stability in acidic and alkaline *** optimal CrN/C material has an ORR half-wave potential of 0.73 and 0.72 V （*** hydrogen electrode） in acidic and alkaline media,*** it retains 82% and 78% of ORR current density in acidic and alkaline media after durability tests,***,the optimal CrN/C material-based self-breathing ZABs deliver a maximum power density of 168 mW·cm-2,which is one of the highest among transition metal nitrides-based ZABs It is found that the ORR activity of CrN/C materials is highly related to the Cr–N valence *** work highlights the good potential of CrN as robust ORR catalyst and verifies its promising application in ZABs.

关键词： Carbon nanosheets CrN Fuel cells Oxygen reduction reaction Zn-air batteries