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mICROSTRUCTURE AND ELECTROCHEmICAL CHARACTERISTICS OF Zr_(0.9)Ti_(0.1)(Ni_(1.1)mn_(0.7)V_(0.2))_x mETAL HYDRIDE ELECTRODE

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Acta metallurgica Sinica(English Letters) 2003年第3期16卷 192-196页

作者： S.m.han m.S.Zhao Y.Z.Zeng Department of Environmental and Chemical Engineering Yanshan University Qinhuangdao 066004China Key Laboratory of Rare Earth Chemistry and PhysicsChangchun Institute of Applied Chemistry The Chinese Academy of SciencesChangchun 130022 ChinaDepartment of Environmental and Chemical Engineering Yanshan University Qinhuangdao 066004China Key Laboratory of Rare Earth Chemistry and PhysicsChangchun Institute of Applied Chemistry The Chinese Academy of SciencesChangchun 130022 ChinaDepartment of Environmental and Chemical Engineering Yanshan UniversityQinhuangdo 066004 China

The crystal structure, the phase composition and the electrochemical characteristics of Zr0.9Ti0.1(Ni1.1mn0.7V0.2)x (x=0.90, 0.95, 1.00, 1.05) alloys were investigated by means of XRD, SEm, EDS and electrochemical measurements. It was shown that all alloys are multiphase with C15 Laves phase as a main phase along with C14 phase and some secondary phases. And the amounts of the C14 phase and secondary phases in the four alloys increases with decreasing x. The results indicated that the various stoichiometric ratios have great effects on the electrochemical characteristics such as the maximum discharge capacity, discharge rate capability and self-discharge properties etc. for Zr0.9Ti0.1(Ni1.1mn0.7 V0.2)X (x=0.90, 0.95, 1.00, 1.05) alloys. The hyper-stoichiometric Zr0.9 Ti0.1(N1.1mn0.7 V0.20)1.05 exhibits the maximum discharge capacity of 332mAh-g-1. The C14 phase and secondary phases seems to improve discharge rate capability of the alloys.

关键词： metal hydride electrode microstructure electrochemical characteristics non-stoichiometric ratio

A multi-mechanism model Describing Reorientation and Reorientation-Induced Plasticity of NiTi Shape memory Alloy

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Acta mechanica Solida Sinica 2018年第4期31卷 445-458页

作者： Xiang Xu Bo Xu han m. Jiang Guo-zheng Kang Qian-hua Kan State Key Laboratory of Traction Power Southwest Jiaotong University Chengdu 610031 China Applied mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and Engineering Southwest Jiaotong University Chengdu 610031 China

The recovery force or recovery strain is an important indicator of NiTi-based shape memory alloy devices. However, the restoring force or recoverable strain is partially restrained due to an interaction between reorientation and reorientation-induced plasticity. Therefore, a macroscopic multi-mechanism constitutive model was constructed to describe the degeneration of shape memory effect based on the phase diagram. The residual strain after cooling consists of reorientation strain and reorientation-induced plastic strain. An internal variable, i.e., the detwinned stress, and its evolution equation were introduced into the transformation kinetics equation to describe the nonlinear hardening characteristics induced by the combined reorien- ration and detwinning mechanisms during mechanical loading. Finally, the proposed model was numerically implemented to simulate the experiments of shape memory effect at different peak strains. Comparisons between the experimental and simulated results show that the proposed model can reasonably describe the degeneration of shape memory effect.

关键词： Shape memory alloy Shape memory effect Residual strain Constitutive model Plastic strain

Safety estimation of high-pressure hydraulic cylinder using FSI method

维普期刊数据库评论

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维普期刊数据库

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排灌机械工程学报 2016年第5期34卷 418-423页

作者： KIm J.H. han S.m. KIm Y.J. Graduate School of mechanical Engineering Sungkyunkwan University Suwon 16419 Republic of Korea HKC CO. Ltd. Ansan 425 - 836 Republic of Korea School of mechanical Engineering Sungkyunkwan University Suwon 16419 Republic of Korea

Hydraulic cylinder is a primary component of the hydraulic valve *** numerical study of hydraulic cylinder to evaluate the stress analysis,the life assessment and the performance of operation characteristics in hydraulic cylinder were *** calculation of safety factor,fatigue life,piston chamber pressure,rod chamber pressure and the change of velocity of piston with flow time after the beginning of hydraulic cylinder were *** analysis was performed using the commercial CFD code,ANSYS with unsteady,dynamic mesh model,two-way FSI(fluid-structure interaction)method and k-εturbulent *** internal pressure in hydraulic cylinder through stress analysis show higher than those of the yield strength.

关键词： two-way fluid-structure interaction high-pressure hydraulic cylinder durability life safety estimation dynamic mesh

INFLUENCE OF HEAT TREATmENT ON OXIDATION PROPERTIES OF C/C COmPOSITES FABRICATED BY HIGH PRESSURE ImPREGNATION CARBONIZATION

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Acta metallurgica Sinica(English Letters) 2004年第4期17卷 426-430页

作者： Q.Chen H.J.Li A.J.Li H.m.han K.Z.Li School of materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 ChinaSchool of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 ChinaSchool of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 ChinaSchool of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 ChinaSchool of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 China

Felt base carbon/carbon composites fabricated by super-high pressure impregnation carbonization process (SPIC) were heat treated at high temperature 2773K. The oxidation properties of felt base carbon/carbon composites were investigated at different temperatures (773-1173K), and the microstructures of carbon/carbon composites were studied by SEm and X-ray diffraction. The experimental results showed that the inter-laminar distance of (002) plane (d002) deceased while the microcrystalline stack height (Lc) increased. The oxidation rate of felt base carbon/carbon composites was invari-able at certain temperatures. The oxidation mechanism of carbon/carbon composites changed remarkably at the oxidation temperature 973K. At the initial oxidation stage of carbon/carbon composites, carbon matrix was oxidized much more rapidly than carbon felt.

关键词： carbon/carbon composites high pressure impregnation carbonization high temperature heat treatment oxidation mi-crostructure

Experimental and Theoretical Research on mechanical Behavior of NiTi Alloys after hydrogen charging

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Experimental and Theoretical Research on Mechanical Behavior...

INFLUENCE OF THE SECOND THERmAL CYCLE ON COARSE- GRAINED ZONE TOUGHNESS OF X70 STEEL

中国力学大会-2021+1

作者： han m Jiang Southwest Jiaotong University

Highlight In this swork,the effect of hydrogen on the mechanical behavior of NiTi alloys is revealed experimentally and theoretically through tensile-unloading experiments of superelastic NiTi alloy wires after hydrogen *** aim of this paper is to establish a mechanical-diffusion coupled constitutive model of NiTi shape memory alloys,which regards the above effects of hydrogen on mechanical behavior of NiTi *** order to calculate the hydrogen concentration,stress and strain fields of NiTi alloy wires,and obtain the overall thermomechanical response of NiTi wire,the aforementioned model is compiled into ABAQUS/Explicit by writing a user material subroutine.

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cnki会议

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Acta metallurgica Sinica(English Letters) 1999年第5期12卷 831-835页

作者： Y.Wang,T.han and W.m.Zhao University of Petroleum,Dongying 257062,China

The influence of the second thermal cycle on coarse grained zone (CGHAZ) toughness of X70 steel is studied by weld thermal simulation test, scanning electron microscope and electron microprobe. The results show that the CGHAZ toughness is improved after the second thermal cycle but being heated during the intercritical HAZ (ICHAZ). The CGHAZ toughness decreases evidently after being heated during partially transformed zone, which chiefly results from the carbon segregation to the grain boundaries of primal austenite, thus forming high carbon martensite austenite (m A) constituent and bringing serious intercritically reheated coarse grain HAZ (IRCGHAZ) embrittlement.

关键词： weld thermal simulation pipeline steel heat affected zone impact toughness

Preparation and applications of calcium ferrite as a functional material:A review

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International Journal of minerals,metallurgy and materials 2025年第2期32卷 292-310页

作者： Xiuli han Bowen Duan Lei Liu Shilong Fang Weiwei Wang College of mining Engineering North China University of Science and TechnologyTangshan 063210China Collaborative Innovation Center of Green Development and Ecological Restoration of mineral Resources of Hebei Province Tangshan 063210China Key Laboratory of mining Development and Security Technology of Hebei Province Tangshan 063210China

Calcium ferrite(CF)is recognized as a potential green and efficient functional material because of its advantages of magnetism,electrochemistry,catalysis,and biocompatibility in the fields of materials chemistry,environmental engineering,and ***-fore,the obtained research results need to be systematically summarized,and new perspectives on CF and its composite materials need to be *** on the presented studies of CF and its composite materials,the types and structures of the crystal are *** addition,the current application technologies and theoretical mechanisms with various properties in different fields are ***,the various preparation methods of CF and its composite materials are elaborated in *** importantly,the advantages and disadvantages of the synthesis methods of CF and its composite materials are discussed,and the existing problems and emerging challenges in practical production are ***,the key future research directions of CF and its composite materials have been prospected from the potential application technologies to provide references for its synthesis and efficient utilization.

关键词： calcium ferrite mineral functional materials preparation application perspectives

Endovascular Treatment in Direct Carotid Cavernous Fistula

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介入放射学杂志 2004年第S1期13卷 97-100页

作者： moon Hee han Department of Radiology Seoul National University College of Medicine M.D. Ph.D.

microstructural evolution during the progressive transformation-induced plasticity effect in a Fe-0.1C-5mnmedium manganese steel

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International Journal of minerals,metallurgy and materials 2025年第2期32卷 369-379页

作者： mei Zhang Wenhao Li Yangfei Chen Yang Jiang Xiaofei Guo han Dong School of materials Science and Engineering Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China

The microstructural evolution of a cold-rolled and intercritical annealed medium-mn steel(Fe-0.10C-5mn)was investigated during uniaxial tensile ***-situ observations under scanning electron microscopy,transmission electron microscopy,and X-ray diffraction analysis were conducted to characterize the progressive transformation-induced plasticity process and associated fracture initiation *** findings were discussed with the local strain measurements via digital image *** results indicated that Lüders band formation in the steel was limited to 1.5%strain,which was mainly due to the early-stage martensitic phase transformation of a very small amount of the less stable large-sized retained austenite(RA),which led to localized stress concentrations and strain hardening and further retardation of *** small-sized RA exhibited high stability and progressively transformed into martensite and contributed to a stably extended Portevin-Le Chatelier *** volume fraction of RA gradually decreased from 26.8%to 8.2%prior to *** the late deformation stage,fracture initiation primarily occurred at the austenite/martensite and ferrite/martensite interfaces and the ferrite phase.

关键词： medium-mn steel retained austenite progressive transformation-induced plasticity effect local strain fracture initiation