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Effect of Re Addition and Withdrawal Rate on the Solidification Behavior of Directionally Solidified Superalloy AM3

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Journal of materials Science & Technology 2011年第2期27卷 101-106页

作者： F.Long Y.S.Yoo S.M.Seo T.Jin Z.Q.Hu C.Y.Jo Institute of Metal Research Chinese Academy of SciencesShenyang 110016China high temperature materials laboratory Korea Institute of Materials Sciences66 Sangnam-dongChangwonKyungunamKorea

The influence of Re addition and withdrawal rate on the solidification behavior of the first generation single crystal superalloy AM3 was investigated by directional solidification and quenching *** primary dendrite arm spacing and eutectic volume fraction were measured from directionally solidified superalloy AM3 with different Re *** is found that the primary dendrite arm spacing is determined by the withdrawal rate,and Re does not influence on the *** eutectic fraction increases with increasing Re *** coeffcients of alloying elements were investigated with energy-dispersive X-ray spectrometry（EDS） *** data was submitted to a statistical treatment to establish the solidification path,and the partition coeficients were measured by fitting the curve with a modified Scheil *** is shown that the addition of Re results in bigger microsegregation of alloying elements in directionally solidified AM3 superalloy.

关键词： Superalloy AM3 Re addation Directional solidification

Role of iron ore in enhancing gasification of iron coke:Structural evolution,influence mechanism and kinetic analysis

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International Journal of Minerals,Metallurgy and materials 2025年第1期32卷 58-69页

作者： Jie Wang Wei Wang Xuheng Chen Junfang Bao Qiuyue Hao Heng Zheng Runsheng Xu School of Chemistry and materials Science Hubei Engineering UniversityXiaogan 432000China Key laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081China Institue of Ironmaking Technology Baosteel Central Research InstituteShanghai 201999China State Key laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The utilization of iron coke provides a green pathway for low-carbon *** uncover the influence mechanism of iron ore on the behavior and kinetics of iron coke gasification,the effect of iron ore on the microstructure of iron coke was ***,a comparative study of the gasification reactions between iron coke and coke was conducted through non-isothermal thermogravimetric *** findings indicate that compared to coke,iron coke exhibits an augmentation in micropores and specific surface area,and the micropores further extend and *** provides more adsorption sites for CO_(2) molecules during the gasification process,resulting in a reduction in the initial gasification temperature of iron *** the heating rate in non-isothermal gasification can enhance the reactivity of iron *** metallic iron reduced from iron ore is embedded in the carbon matrix,reducing the orderliness of the carbon structure,which is primarily responsible for the heightened reactivity of the carbon *** kinetic study indicates that the random pore model can effectively represent the gasification process of iron coke due to its rich pore ***,as the proportion of iron ore increases,the activation energy for the carbon gasification gradually decreases,from 246.2 kJ/mol for coke to 192.5 kJ/mol for iron coke 15wt%.

关键词： low-carbon ironmaking iron coke gasification structural evolution kinetic model

Design Fe-based Eutectic Medium-Entropy Alloys Fe_2NiCrNb_x

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Acta Metallurgica Sinica(English Letters) 2021年第8期34卷 1103-1108页

作者： Jiafen Song Zishu Chai Jian Zheng Qingfeng Wu Feng He Zenan Yang Junjie Li Jincheng Wang Haiou Yang Zhijun Wang State Key laboratory of Solidifi cation Processing Northwestern Polytechnical UniversityXi’an 710072China Science and Technology On Advanced high temperature Structural materials laboratory Beijing Institute of Aeronautical MaterialsBeijing 100095China

high-entropy alloys have attracted broad research interests due to their unique and intriguing mechanical properties. As a category of high-entropy alloys, eutectic high-entropy alloys combine the advantages of eutectic and high-entropy alloys, with excellent mechanical properties and casting properties. Some eutectic high-entropy alloys have been developed and shown exciting properties. In this paper, based on the physical metallurgy of eutectic high-entropy alloy, medium-entropy alloy Fe_(2)NiCrNb_(x) was designed. The as-cast alloy is composed of FCC and Laves phases, Nb element promotes the formation of primary Laves phase, and the hardness of the alloy increases with the increase in Nb element. Among the four alloys, the eutectic chemical composition at eutectic point is Fe_(2)NiCrNb_(0.34);the alloy has a good strength and plastic balance. The ultimate comprehensive strength is 2267 MPa, and the fracture strain is 30.8%. The experiment data and analyses identified the eutectic points and the excellent mechanical behavior. Moreover, the expensive Co element was replaced by Fe element. This cheap medium-entropy alloy has promising prospect in the consideration of the cost performance ratio.

关键词： Eutectic medium-entropy alloy Microstructure Mechanical properties

Analysis of non-ionized substance losses in experiments on plasma mass separation

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Plasma Science and Technology 2022年第8期24卷 124-129页

作者： R A USMANOV N N ANTONOV A V GAVRIKOV G D LIZIAKIN A D MELNIKOV A P OILER V P SMIRNOV R A TIMIRKHANOV L S VOLKOV N A VORONA laboratory of Electrophysical and Plasma Devices Joint Institute for High TemperatureMoscow 125412Russia

Plasma mass separation requires a lot of diagnostic techniques that not only demonstrate the separation effect but also show the efficiency of the *** the test experiments,plasma flux to be separated may contain neutral particles that avoid the separation process due to their insensitivity to electromagnetic *** present the diagnostics of the lost substance in experiments on plasma mass *** obtained data of the diagnostics helps determine the law of particle evaporation from the plasma *** show that neutral flux is unable to distort the result of separation *** presented approach can be used in experiments aimed at enhancing the separation effect and achieving target productivity for industry applications.

关键词： plasma mass separation plasma diagnostics lead silver film deposition

Relationship between color and composition of Cu-Mn-Zn alloys

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中国有色金属学会会刊：英文版 2002年第6期12卷 1031-1035页

作者：张玉平张津徐吴建生 Key laboratory of the Ministry of Education for high temperature materials and Testing Shanghai Jiaotong University Department of materials Science & Technology Taiyuan Heavy Machinery Institute Taiyuan 030024 China

The color of Cu Mn Zn alloys is quantitatively researched using the CIE L * a * b * color system. The color parameters such as L *, a * and b * are employed to describe the color and are measured by a spectrophotometer. Based on the color data of 46 experimental alloys, a series of formulae are established to correlate color parameters changed with the alloy composition. Therefore, the color of the ternary Cu Mn Zn alloys can be calculated and forecast easily. The results show that Mn plays a more important role in the color of Cu Mn Zn alloys than Zn does. In particular, the chroma values of ternary Cu Mn Zn alloys mainly depend on the Mn content.

关键词：铜锰锌合金色度衰退分光光度计锰含量

PERTURBATION FINITE VOLUME METHOD FOR CONVECTIVE-DIFFUSION INTEGRAL EQUATION

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Acta Mechanica Sinica 2004年第6期20卷 580-590页

作者：高智杨国伟 Key laboratory of high temperature Gas Dynamics Institute of MechanicsBeijing 100080China

A perturbation finite volume(PFV)method for the convective-diffusion integral equa- tion is developed in this *** PFV scheme is an upwind and mixed scheme using any higher-order interpolation and second-order integration approximations,with the least nodes similar to the standard three-point schemes,that is,the number of the nodes needed is equal to unity plus the face-number of the control *** instance,in the two-dimensional(2-D)case,only four nodes for the triangle grids and five nodes for the Cartesian grids are utilized,*** PFV scheme is applied on a number of 1-D linear and nonlinear problems,2-D and 3-D flow model *** with other standard three-point schemes,the PFV scheme has much smaller numerical diffusion than the first-order upwind scheme(UDS).Its numerical accuracies are also higher than the second-order central scheme(CDS),the power-law scheme(PLS)and QUICK scheme.

关键词： perturbation finite volume convective-diffusion integral equation numerical accuracy

16.48% Efficient solution-processed CIGS solar cells with crystal growth and defects engineering enabled by Ag doping strategy

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Journal of Energy Chemistry 2025年第1期 59-65页

作者： Mengyu Xu Shaocong Yan Ting Liang Jia Jia Shengjie Yuan Dongxing Kou Zhengji Zhou Wenhui Zhou Yafang Qi Yuena Meng Litao Han Sixin Wu Key laboratory for Special Functional materials of MOE National & Local Joint Engineering Research Centre for High-efficiency Display and Lighting Technology School of Nanoscience and Materials Engineering Henan University

Solution-processed Cu（In,Ga）Se2（CIGS） solar cells suffer from serious carrier recombination and power conversion efficiency（PCE） loss because of the poor film properties and easy formation of ***, we propose Ag&Se co-selenization strategy to enhance the crystallization and passivate harmful defects of the CIGS films. The formation of Ag-Se phase during the selenization process enables the formation of large grains and suppresses the deep level defects. It is found that Ag doping can enlarge the depletion region width, lower the Urbach energy and prolong the carrier lifetime. As a result, a champion solution-processed CIGS solar cell presents a high efficiency of 16.48% with the highly improved opencircuit voltage（VOC） of 662 m V and fill factor（FF） of 75.8%. This work provides an efficient strategy to prepare high quality solution-processed CIGS films for high-performance CIGS solar cells.

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Deformation behavior and creep properties of Co-Al-W-based superalloys:A review

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Progress in Natural Science:materials International 2021年第5期31卷 641-648页

作者： Yunsong Zhao Yuheng Zhang Yi Zhang Yushi Luo Dingzhong Tang Haitao Liu Huadong Fu Science and Technology on Advanced high temperature Structural materials laboratory Beijing Institute of Aeronautical Materials Institute for Advanced materials and Technology University of Science and Technology Beijing State Key laboratory of Rolling and Automation Northeastern University

Co-Al-W-based superalloys may become a next generation of high-temperature structural materials used in the hot-section of gas turbine because of the discovery of γ’-strengthening mechanism. The current understanding of deformation behavior and creep properties of Co-Al-W-based superalloys is reviewed in this study. It is found that the Co-Al-W-based superalloys have strong anomalous yield stress behavior and better creep properties, making it as an attractive candidate for high-temperature structural material. The relationship between deformation/creep microstructure and the properties of the alloys needs to be further clarified, which can provide deeper theoretical guidance for further composition design, optimization of heat treatment processes, and guidance of alloy service.

关键词： Co-Al-W-based superalloys Deformation behavior Creep properties

Synthesis of high-purity Ti2SC powder by microwave hybrid heating

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Journal of Advanced Ceramics 2016年第4期5卷 337-343页

作者： Chunlong GUAN Nana SUN School of Material Science and Engineering Henan University of Technology Engineering Laboratory of High Temperature Resistance-Wear Materials Zhengzhou 450007 China

A novel simple method is presented to synthesize high-purity Ti2SC powder using Ti/C/S and Ti/C/TiS2 systems by microwave hybrid heating at different temperatures in argon *** was confirmed that the synthesis temperature is strongly dependent on the starting *** Ti/C/S system,Ti2SC with small amounts of TiS and TiC was synthesized at 1200 ℃.For Ti/C/TiS2 system,high-purity Ti2SC was synthesized at 800 ℃ and *** synthesis of Ti2SC powder at low temperature was attributed to the combination of microwave effect by microwave hybrid heating and the introduction of TiS2 as sulfur *** electron microscopy (SEM) analysis indicated that the layered structure of Ti2SC particles is perfectly formed at 1100 ℃,and the crystal particle size approaches to homogeneity which is about 2-5 μ*** was presumed that the formation mechanism of Ti/C/TiS2 system is that TiS2 firstly reacts with Ti to form Ti-S intermetallics,then Ti-S intermetallics reacts with un-reacted Ti and graphite to produce Ti2SC.

关键词： Ti2SC microwave hybrid heating formation mechanism