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Specific Heat and Interface Energy of Nanostructured ZrAlNiCuCo Alloy

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Journal of Materials Science & Technology 1997年第4期13卷 284-288页

作者： jiang, q Sui, ZX Li, JC Xu, XY Dept. of Materials Science and Engineering Jilin University of Technology Changchun 130025 China

The specific heat of the nanostructured crystals, the glass, the liquid and the crystals for a ZrAlNiCuCo alloy has been measured by using the differential scanning calorimeter. The specific heat value and its temperature coefficient of the nanostructured crystals are larger than that of the relaxed glass and of the crystals. Through measuring crystallization enthalpies and specific heat of the alloy in different states, the enthalpy differences among the crystals, the liquid and the nanostructured crystals are calculated and the interface energies of nanostructured crystals are estimated. The stability and the grain size limit of the nanostructured crystals are discussed.

关键词： Nanostructured materials

Packing Densities and Glass Forming Ability of Alloys

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Journal of Materials Science & Technology 1996年第4期12卷 299-302页

作者： jiang, q Xu, XY Niu, HJ Lu, XX Dept. of Materials Science and Engineering Jilin University of Technology Changchun 130025 China

The random closed packing fraction of hard balls of three different sizes were measured by use of the Archimedes method. This packing fraction increases as the kind of balls with different sizes increases. The packing fraction is related to the mixing entropy of an ideal solution in respect to the holes among the hard balls. The composition zone of La-Al-Ni amorphous alloy made by cooling the alloy melt with a cooling rate of 90 Ks(-1) is located at same zone of the largest values of packing fraction and mixing entropy of hard balls in the ternary system, where the proportion of atom sizes of La, Al and Ni is similar to that of hard balls. The packing fraction and the mixing entropy are qualitatively considered as one of the criteria of the glass forming ability of alloys.

关键词： Amorphous materials

Synthesis of New Squarains Used as Organic Electroluminescent Materials

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Chinese Chemical Letters 1997年第5期8卷 403-406页

作者： Liu, N Lu, ZY Xie, MG jiang, q SICHUAN UNIV DEPT CHEMCHENGDU 610064PEOPLES R CHINA

Two types of eight kinds of new squarains were designed and synthesized. Their structures were elucidated by IR,NMR,MS and elementary analysis. Their luminescent properties were determined,which indicated that they ca... 详细信息

关键词： OC Cl

Influence of Fe Addition on Products of Self-Propagating High-Temperature Synthesis Reaction in 3Ti-Si-2C System

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稀有金属材料与工程 2009年第A3期38卷 113-118页

作者： Guan q L Wang H Y Li S L Si W P jiang q C Key Laboratory of Automobile Materials of Ministry of Education Jilin University Changchun 130025 China

Influence of Fe addition on products of self-propagating high-temperature synthesis (SHS) reaction in 3Ti-Si-2C system was investigated in the present study. Without Fe addition, Ti5Si3 and TiC are the dominant phases along with a small amount of Ti3SiC2 phase and unreacted C left in the final products. As Fe content ranges from 10% to 30%, the products consist of TiC, Ti5Si3, Fe2Ti and unreacted C, but no trace of Ti3SiC2 phase is detected. Furthermore, the amounts of both Fe2Ti and C phases increase with Fe content increasing. Addition of Fe has a great effect on the reaction route and significantly restrains the formation of Ti3SiC2 during the combustion synthesis process, and therefore, the SHS is not an effective fabrication technique to synthesize the ternary Ti3SiC2 ceramic in either 3Ti-Si-2C or Fe-3Ti-Si-2C system. Besides, without Fe addition, Ti5Si3 presents as the coarse irregular appearance with an obviously sintered morphology. In contrast, the shape of Ti5Si3 exhibits more and more spherical (cobblestone-like) and the surface becomes increasingly smooth, because the amount of liquids formed during the SHS reaction increases with the increase of Fe content. On the other hand, with Fe content increasing from 0 to 30 wt.%, the particulate size of TiC decreases from more than 5 μm to 1 μm or less, mainly due to the fact that the combustion temperature decreases with the increase of Fe content in the preforms.

关键词：复合材料铁含量燃烧过程物理性能

EFFECT OF MODIFICATION ON CARBIDE GRANULATION AND ITS MECHANISM

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Acta Metallurgica Sinica(English Letters) 1999年第2期12卷 167-172页

作者： Wang, S.q. jiang, q.C. Cui, X.H. He, Z.M. Jilin Univ of Technology Changchun China

By the modification, network carbide is disconnected at 1100 degree C through uneven dissolution at higher energy places in carbide, where there is twin or lattice distortion, and is granulated at 1130 degree C through element diffusion. The stability of M//7C//3 carbide is decreased because of the modification reducing the segregation of Cr and Mo, thus the temperature, at which uneven dissolution of carbide commenced, is decreased. Also lattice distortion or defect such as twin in carbide is increased by the modification, which prompts widespread disconnections in carbide. In addition, the modification prompts element diffusion to accelerate the kinetics process of carbide granulation. (Edited author abstract) 6 Refs.

关键词： Carbides Chromium alloys Granulation Modification Morphology

IMPROVEMENT OF CARBIDE MORPHOLOGY ANDMECHANICAL PROPERTIES OF Cr12MoV STEELS

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Acta Metallurgica Sinica(English Letters) 2000年第5期13卷 1053-1058页

作者： Cui, X.H. jiang, q.C. Wang, S.q. He, Z.M. Sch. of Mat. Sci. and Eng. Jilin Univ. of Technol. Changchun 130025 China

Compared with conventional cast Cr12MoV steel and forged Cr12MoV steels, carbide morphology and properties of modified cast Cr12MoV steels were investigated by performing hardness test, impact test, fracture toughness test, fatigue crack propagation test, metallographic examination and quantitatively metallographic analysis. The results indicate that the carbide morphology in modified cast steel is characterized by uniformly-distributed granular carbide, which is different from that of conventional cast steel, but similar to that of forged steel. the impact toughness of modified cast steel is distinctly increased to 12.75 J/cm2 from 6.8 J/cm2 in the conventional cast steel with networked carbide, because of carbide granulation. Furthermore, The fracture toughness and fatigue-crack-propagation threshold of modified cast steel are not only higher than that of the conventional cast steel, but also higher than that of the forged steels.

关键词： Alloys Carbides Mechanical properties Morphology

Automotive revolution and carbon neutrality

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Frontiers in Energy 2023年第6期17卷 693-703页

作者： C.C.CHAN Wei HAN Hanlei TIAN Yanbing LIU Tianlu MA C.q.jiang Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina Sustainable Energy and Environment Thrust Hong Kong University of Science and Technology(Guangzhou)Guangzhou 511453China Department of Electronic and Computer Engineering Hong Kong University of Science and TechnologyHong KongChina Department of Electrical Engineering City University of Hong KongHong KongChina HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute Shenzhen 518048China

The automotive industry is in the midst of a groundbreaking revolution,driven by the imperative to achieve intelligent driving and carbon neutrality.A crucial aspect of this transformation is the transition to electric vehicles(EVs),which necessitates widespread changes throughout the entire automotive *** paper examines the challenges and opportunities of this transition,including automotive electrification,intelligence-connected transportation system,and the potential for new technologies such as hydrogen fuel ***,it discusses the key technologies and progress of the hydrogen energy industry chain in the upstream hydrogen production,midstream hydrogen storage and transportation,downstream hydrogen station construction and hydrogen fuel cells in ***,it proposes the directions for future layout,providing guidance for future development.

关键词： automotive revolution electric vehicles(EVs) hydrogen energy fuel cell

Microstructure and mechanical properties of Mg-to-Al dissimilar welded joints with an Ag interlayer using ultrasonic spot welding

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Journal of Magnesium and Alloys 2020年第2期8卷 552-563页

作者： H.Peng D.L.Chen X.F.Bai P.q.Wang D.Y.Li X.q.jiang College of Engineering and Technology Southwest UniversityTiansheng Road 2Beibei DistrictChongqing 400715China Department of Mechanical and Industrial Engineering Ryerson University350 Victoria StreetTorontoOntario M5B 2K3Canada School of Materials and Energy Southwest UniversityTiansheng Road 2Beibei DistrictChongqing 400715China Department of Chemical and Materials Engineering University of AlbertaEdmontonAlberta T6G 1H9Canada

Lightweight ZEK100-0 Mg alloy and A16022-T43 Al alloy with an Ag interlayer were joined via ultrasonic spot welding(USW),focusing on the microstructural change and tensile lap shear strength of the welded joints in relation to welding ***/Al interface was superseded by Mg/Ag and Al/Ag interfaces,and unfavorable Mg门A-intermetallic compound was *** foil was observed to be intact in the nugget center,while it was broken or dissolved at the nugget edge at high welding energy *** diffusion layer at the Mg/Ag interface consisted of two distinctive sub-layers:Mg3Ag intermetallic compound adjoining Ag foil,and Mg3Ag-l-Mg eutectic structure adjacent to *** a thin diffusion layer consisting mainly of Ag3Al occurred al lhe Al/Ag *** tensile lap shear strength first increased,reached its peak value,and then decreased with increasing welding *** shear strength achieved in the present study was〜31%higher than that of the joint without *** failure occurred at all energy levels,with Ag foil particles or fragments being stuck on both Mg and Al sides due to its intense interaction with Mg and Al via accelerated diffusion during *** results obtained pave the way for the challenging dissimilar welding between Mg and Al alloys.

关键词： Magnesium alloy Aluminum alloy Ultrasonic spot welding Ag interlayer Microstructure Tensile lap shear strength

Carbon nanotubes grown on glass fiber as a strain sensor for real time structural health monitoring

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International Journal of Smart and Nano Materials 2012年第2期3卷 162-168页

作者： M.Boehle q.jiang L.Li A.Lagounov K.Lafdi Carbon Research Laboratory University of Dayton Research Institute300 College ParkDaytonOH 45469USA

In order to more effectively monitor the health of composite structures,a fuzzy fiber sensor has been *** fuzzy fiber is a bundle of glass fibers with carbon nanotubes or nanofibers(CNTs or CNFs)grown on the *** nanotube coating makes the fiber bundle conductive while the small conductive path increases *** fuzzy fiber sensor can replace conventional metal foil strain gauges in composite *** electrical response of the sensor is monitored in real time to measure strain,vibration,cracking and *** monitoring provides instant notification of any *** of this sensor network in a composite can increase service life,decrease maintenance costs and greatly reduce inspection downtime.

关键词： carbon nanotube sensor polymer composite structural health monitoring