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Frontispiz: Biological Nicotinamide Cofactor as a redox‐Active Motif for reversible Electrochemical Energy Storage

Angewandte Chemie 2019年第47期131卷

作者： Jihyeon Kim Sunghyun Ko Chanwoo Noh Heechan Kim Sechan Lee dodam Kim Hyeokjun Park Giyun Kwon Giyeong Son Jong Wan Ko YounJoon Jung dongwhan Lee Chan Beum Park Kisuk Kang Department of Materials Science and Engineering Seoul National University 1 Gwanak-ro Gwanak-gu Seoul 08826 Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology 335 Science Road Daejeon 305-701 Republic of Korea Department of Chemistry Seoul National University 1 Gwanak-ro Gwanak-gu Seoul 08826 Republic of Korea Advanced Forming Process R&D Group Korea Institute of Industrial Technology Republic of Korea

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Frontispiece: Biological Nicotinamide Cofactor as a redox-Active Motif for reversible Electrochemical Energy Storage

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Angewandte Chemie International Edition 2019年第47期58卷

作者： Jihyeon Kim Sunghyun Ko Chanwoo Noh Heechan Kim Sechan Lee dodam Kim Hyeokjun Park Giyun Kwon Giyeong Son dr. Jong Wan Ko Prof. dr. YounJoon Jung Prof. dr. dongwhan Lee Prof. dr. Chan Beum Park Prof. dr. Kisuk Kang Department of Materials Science and Engineering Seoul National University 1 Gwanak-ro Gwanak-gu Seoul 08826 Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology 335 Science Road Daejeon 305-701 Republic of Korea Department of Chemistry Seoul National University 1 Gwanak-ro Gwanak-gu Seoul 08826 Republic of Korea Advanced Forming Process R&D Group Korea Institute of Industrial Technology Republic of Korea

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Biological Nicotinamide Cofactor as a redox‐Active Motif for reversible Electrochemical Energy Storage

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Angewandte Chemie 2019年第47期131卷

Nicotinamide adenine dinucleotide (NAd + ) is one of the most well‐known redox cofactors carrying electrons. Now, it is reported that the intrinsically charged NAd + motif can serve as an active electrode in electrochemical lithium cells. By anchoring the NAd + motif by the anion incorporation, redox activity of the NAd + is successfully implemented in conventional batteries, exhibiting the average voltage of 2.3 V. The operating voltage and capacity are tunable by altering the anchoring anion species without modifying the redox center itself. This work not only demonstrates the redox capability of NAd + , but also suggests that anchoring the charged molecules with anion incorporation is a viable new approach to exploit various charged biological cofactors in rechargeable battery systems.

关键词： Bioenergetik Cofaktoren Energiespeicherung Organische Elektroden redoxchemie

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Effect of Pre-strain on Tensile Properties of Al5052-H32 under an Electropulsing Condition

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Procedia Engineering 2017年 207卷 371-376页

作者： Minki Kim Junghan Song Hoon Huh Department of Mechanical Engineering Korea Advanced Institute of Science and Technology Daehak-ro 291 Yuseong-gu Daejeon 34141 South Korea Metal Forming Technology R&D Group Korea Institute of Industrial Technology Gaetbeol-ro 156 Yeonsu-gu Incheon 21999 South Korea

This paper is concerned with the effect of pre-strain on tensile properties of Al5052-H32 under an electropulsing condition. The electroplasticity of Al5052-H32 considering the pre-strain effect is investigated to confirm the formability focused on the level of flow stress and the elongation at fracture. Tensile tests for the pre-strain effect are carried out under two different conditions: pre-straining without the electropulsing and tensile testing continuously with the electropulsing; pre-straining with the electropulsing and tensile testing continuously without the electropulsing. Under the test conditions, electropulsing tensile tests were conducted at the quasi-static of 0.001 s −1 to investigate the effect of the starting point for applying electric current and that of the accumulated electrical energy on the material behavior in terms of the formability. In order to identify the pre-strain effect, the levels of the pre-strain were determined based on the uniform elongation of Al5052-H32 obtained from tensile tests without the electric current. The digital Image Correlation (dIC) method was used to measure the strain of a specimen. The temperature history of a specimen during the test was measured by using the infra-red thermal imaging camera of FLIr-T621. Experimental results show that the elongation is enhanced as the starting point of applying electric current is delayed for uniform deformation and the elongation increases as the amount of elevated temperature increases with increasing the accumulated electrical energy.

关键词： Electroplasticity Tensile property Aluminum alloy Elevated temperature Electropulsing

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difference in the Hot Compressive Behavior and processing Maps between the As-cast and Homogenized Al-Zn-Mg-Cu(7075) Alloys

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Journal of Materials Science & Technology 2016年第7期32卷 660-670页

作者： S.Y. Park W.J. Kim Department of Materials Science and Engineering Hongik University 72-1 Sangsu-dong Mapo-gu Seoul 121-791 Republic of Korea Advanced Fusion Process R&D Group Korea Institute of Industrial Technology 994-32 Dongchun-dong Yeonsu-gu Incheon 406-130 Republic of Korea

The deformation mechanisms and processing maps of the as-cast Al-Zn-Mg-Cu （？0？5） aluminum （AI） alloy were studied and compared with those of the homogenized 7075 Al alloy in the temperature range of 573-723 K and in the strain rate range of 10 3-10 s-1 to explore a possibility for directly using the as- cast 7075 Al alloy as a billet for hot working. The as-cast and homogenized 7075 A1 alloys had similar grain sizes and showed similar high-temperature deformation behaviors. The as-cast 7075 Al alloy, however, exhibited higher power efficiencies and smaller unstable flow regions compared to the homogenized 7075 AI alloy because of the presence of secondary phases （MgZn2） segregated at the dendritic interfaces in the as-cast microstructure, which were formed during non-equilibrium solidification. These segregated phases provided nucleation sites for dynamic recovery or continuous dynamic recrystallization, and as a result a fine and more homogeneous （sub）grain structure could be obtained from the as-cast micro- structure compared to the homogenized microstructure. The current work suggested the possibility and advantage of using as-cast microstructures for hot working of aluminum alloys with high content of solutes.

关键词： Al-based alloysprocessing mapHot compressionAs-cast microstructureSegregationrecrystallization

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Effect of intermetallic compound thickness on anisotropy of Al/Cu honeycomb rods fabricated by hydrostatic extrusion process

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Transactions of Nonferrous Metals Society of China 2016年第2期26卷 456-463页

作者： Tae-hyuk LEE Moon-soo SIM Sin-hyeong JOO Kyoung-tae PArK Ha-guk JEONG Jong-hyeon LEE Graduate School of Department of Advanced Materials Engineering Chungnam National University Rapidly Solidified Materials Research Center Chungnam National University Graduate School of Energy Science & Technology Chungnam National University Rare Metal R&D Group Korea Institute of Industrial Technology Advanced Fusion Process R&D Group Korea Institute of Industrial Technology

The effect of intermetallic compound （IMC） thickness on the thermal and mechanical properties of Al/Cu honeycomb rods was investigated. The Al/Cu honeycomb rods were fabricated using repeated hydrostatic extrusions at 200 ℃. during the process, an IMC layer with 1μm in thickness was generated at the Al/Cu interface. different IMC thicknesses were obtained by post-heat treatment at 420 ℃ for 0.5 to 2 h. The IMC thickness increased to 10.1μm. The IMC layers were identified as Al2Cu （θ）, AlCu （η2）, and Al4Cu9（γ1） phases. The thermal conductivities in the longitudinal direction and cross direction decreased by 11.9% （（268±4.8） to （236±4.4） W/（m·K）） and 10.4% （（210±3.2） to （188±2.8） W/（m＆#183;K））, respectively, with increasing IMC thickness. The ultimate tensile strength and elongation of the Al/Cu honeycomb rod are （103±8.4） MPa and （73±6.2）%, respectively. The ultimate tensile strength increased to （131±6.5） MPa until the IMC thickness reached 7.7μm. It subsequently decreased to （124±3.9） MPa until the IMC thickness reached 10.1μm. The elongation of the Al/Cu honeycomb rod then sharply decreased to （29±2.5）% with increasing IMC thickness.

关键词： intermetallic compound Al/Cu honeycomb rod anisotropy thermal conductivity tensile strength hydrostatic extrusion

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Identification of kinematic hardening material parameters for martensitic steel sheets 1st

Identification of kinematic hardening material parameters fo...

引用

1st International Conference on Civil Engineering and Materials Science, ICCEMS 2016

作者： Song, J.H. Park, J.S. Lee, C.A. Kim, H.Y. Choi, W.H. Metal Forming R&D Group Research Institute of Advanced Manufacturing Technology Korea Institute of Industrial Technology 156 Gaetbeol-ro Yeonsu-Gu Incheon21999 Korea Republic of Department of Mechanical and Biomedical Engineering Kangwon National University 1 Kangwondaehak-gil Chuncheon-si Gangwon-do24341 Korea Republic of R&D Center Sewon Co. Ltd 54 Dalseodae-ro Dalseo-gu Daegu42702 Korea Republic of

ISBN: (纸本)9783038357483

The identification of the material models which are used in the finite element analysis for the forming operation and springback are very important in terms of accurate predictions. The aim of this paper is to characterize both the anisotropy and the hardening of the ultra-high strength steel such as martensitic steel (MS steel) in order to identify material parameters of constitutive equation, which able to reproduce the mechanical behavior. Uniaxial tensile tests were carried out for characterizing the anisotropic plastic behavior of the MS steel. Cyclic tests under tension-compression load were also carried out for characterizing the Bauschinger effect during reverse deformation. Yoshida-Uemori hardening model associated with orthotropic yield criterion Hill’s 1948 is used to represent the in-plane mechanical behavior of the martensitic steel. The resented results show a very good agreement between model predictions and experiments: flow stresses during loading and reverse loading are well reproduced. © 2016 Trans Tech Publications, Switzerland.

关键词： Anisotropy

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Cover Picture: Well-defined Cesium Benzotriazolide as an Active Catalyst for Generating disubstituted Ureas from Carbon dioxide and Amines (ChemCatChem 2/2017)

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ChemCatChem 2017年第2期9卷 213-213页

作者： Cong Chien Truong Jin Kim Prof. Yunho Lee Prof. dr. Yong Jin Kim Department of Green Process and System Engineering Korea University of Science and Technology (UST) 89 Yangdaegiro-gil Ipjang-myeon Cheonan 31056 Korea Department of Chemistry Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 Korea Green Material and Process R&D Group Korea Institute of Industrial Technology (KITECH) 89 Yangdaegiro-gil Ipjang-myeon Cheonan 31056 Korea

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Manufacture of μ-PIM gear mold by electroforming of Fe-Ni and Fe-Ni W alloys

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Transactions of Nonferrous Metals Society of China 2013年第2期23卷 366-371页

作者： Seong Ho SON Sung Cheol PArK Wonsik LEE Hong-Kee LEE Heat Treatment & Plating Technology Center Korea Institute of Industrial Technology Advanced Fusion Process R&D Group Korea Institute of Industrial Technology

The micro gear mold for powder injection molding was made by electroforming process of Fe-Ni and Fe-Ni-W alloys using UV-lithography process. Kinetics and activation energies in electroplating of both alloys were investigated to determine the best process conditions. Fe content within electrodeposited Fe-Ni alloys increased with the increase of rotating disk speed and the decrease of temperature and it is considered from the calculated activation energy of iron content that the rate determining step is controlled by mass transfer. Iron content in Fe-Ni electrodeposit varied from 58.33% to 70.45% by increasing current density from 2 to 6 A/drn2. Also, iron content in Fe-Ni-W electrodeposit increased from 59.32% to 70.15%, nickel content decreased from 27.86% to 17.07% and the content of tungsten was almost consistent in the range of 12.78%-12.82% although the current density increases from 1.5 to 5 A/dm^2. For the electroforming of micro gear mold, SU-8 mandrel with 550 μm in diameter and 400 μm in height was prepared by UV-lithography processing. Subsequently, Fe-36Ni and Fe-20Ni-13W alloys micro gear molds were electroformed successfully. Surface hardness values of the electroformed micro molds were measured to be HV490 and HV645, respectively.

关键词： electroforming Fe-Ni alloy Fe-Ni-W alloy gear mold PIM

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Effect of Pulsed Electric Current on the Tensile Properties of dP Type Ultra-high Strength Steel Sheets

Effect of Pulsed Electric Current on the Tensile Properties ...

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2013 International Conference on Mechatronic Systems and Materials Application (ICMSMA 2013)

作者： J.H.Song J.Lee I.Hwang Y.B.Kim S.Choi G.A.Lee M.J.Kang Forming Technology R&D Group Korea Institute of Industrial Technology Advanced Welding & Joining R&D Group Korea Institute of Industrial Technology

Although ultra-high strength steel(UHSS)sheets with tensile stress above 1.0 GPa have a great attention in the automotive industries for reducing the weight and improving fuel efficiency of auto-body,the poor formability of UHSS sheets is one of the main factors hindering their industrial *** the formability is a very important and challenging problem to both automotive and manufacturing *** this study,the electro-plastic effect,which is first discovered in 1960s,of ultra-high strength steel sheets is investigated to improve the *** begin with,a test system is built up to carry out the tensile test with heavy electric current flowing through the *** evolutions of the flow stress and the electric resistivity are obtained using this test *** significant decrease in the flow stress caused by the heavy flowing through current is observed.

关键词： Pulsed electric current Electro-plasticity dual Phase(dP) steel Flow stress drop

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