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Journal of Forestry Research 2019年第6期30卷 2367-2370页

作者： Mujie Qi yang-seop bae Houhun Li College of Life Sciences Nankai UniversityTianjin 300071China College of Natural Sciences and Bioengineering Incheon National UniversityIncheon 406-772Korea

Two species of Minooa are revised from China and Southeast Asia,and one of these,Minooa carinata Qi,bae&Li,*** described as new to science,and *** Qi,2016 is newly recorded from *** of adults,male and female genitalia... 详细信息

关键词： Lepidoptera Pyralidae Pyralinae Minooa New species China SE Asia

Review of the Eilema group of lichen moths from South Korea,with description of one new species(Lepidoptera:Erebidae:Arctiinae:Lithosiini)

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Journal of Forestry Research 2016年第2期27卷 407-417页

作者： Ulziijargal Bayarsaikhan Young-Don Ju yang-seop bae Division of Life Sciences College of Life Sciences and Bioengineering Incheon National University

This review details Eilema group in the subfamily the Korean species of the Arctiinae of Erebidae： 19 species in five genera （Manulea, Collita, Katha, Dolgoma, and Wittia）, a new species （Collita hwacheonensis Bayar- saikhan ＆ bae, sp. nov.）, and an unrecorded species [C. vetusta aegrota （Butler 1877）]. All species are diagnosed, and figures of the adults and genitalia and a key to species based on male genital structure of Eilema group in South Korea are included.

关键词： Lepidoptera Erebidae Biodiversity Seasonal changes Eilema Collita hwacheonensis Newspecies South Korea

First discovery of a cave-dwelling Tineid moth(Lepidoptera, Tineidae) from East Asia

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Journal of Forestry Research 2014年第3期25卷 647-651页

作者： Bong-Kyu Byun Sat-Byul Shin yang-seop bae Do Sung Kim Yong Geun Choi Department of Biological Science and Biotechnology Hannam University Division of Life Sciences University of Incheon The Institute for Conservation of Wild Species

In this study, we report Monopis crocicapitella （Clemens, 1859）（Tineidae）, which was collected from bat guano in a cave in the southern region of Korea, for the first time from East Asia. We briefly redescribe and illustrate the external morphology and genital structures of both sexes. Also, we discuss the local habitat characteristics and some of the ecological information that was observed during our field investi-gation.

关键词： Monopis Tineidae Lepidoptera Bat guano new record,Korea East Asia.

Origin of superior low-cycle fatigue resistance of an interstitial metastable high-entropy alloy

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Journal of Materials Science & Technology 2022年第20期115卷 115-128页

作者： Seyed Amir Arsalan Shams Jae Wung bae Jae Nam Kim Hyoung seop Kim Taekyung Lee Chong Soo Lee Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyPohang 37673Republic of Korea Department of Materials Science and Engineering Pohang University of Science and TechnologyPohang 37673Republic of Korea School of Mechanical Engineering Pusan National UniversityBusan 46241Republic of Korea

In this study, the deformation behaviors and related microstructural evolutions were investigated in either monotonic or cyclic deformation modes in an interstitial metastable high-entropy alloy. These investigations aimed to reveal the mechanisms underlying the superior low-cycle fatigue(LCF) life of this alloy.A thermomechanical process was applied to induce fine-grained(FG) and coarse-grained(CG) microstructures in Fe–30Mn–10Co–10Cr–0.4C(atomic percentage) alloy. Their superior combination of strength and ductility was attributed to the appearance of deformation-induced ε-martensite and the presence of carbon. The CG alloy showed a greater volume fraction of ε-martensite than the FG alloy in the monotonic deformation mode, and vice versa in the cyclic mode. Such a disparity was interpreted in light of the back-stress effect of the relaxed γ-grain boundaries in the latter mode. Meanwhile, the γ-to-ε phase transformation under cyclic loading at low strain amplitudes(0.4%) barely led to an improved fatigue life as compared with that at higher strain amplitudes(≥ 0.55%). The high reversibility of partial dislocation motions under cyclic loading and delaying the formation of dislocation cells through the martensitic transformation could explain why the alloys investigated in this study exhibited a superior LCF life compared with high-entropy alloys reported in previous studies.

关键词： High-entropy alloy Transformation-induced plasticity Monotonic deformation Cyclic deformation Low-cycle fatigue Stacking faults

Synthesis and microstructure of zirconia nanopowders by glycothermal processing

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中国有色金属学会会刊：英文版 2009年第B09期19卷 88-91页

作者： Jun-seop KIM Dong-Hae LEE Sung KANG Dong-Sik bae Hoy-Yul PARK Moon-Kyeung NA School of Nano & Advanced Material Engineering College of EngineeringChangwon National University Advanced Materials and Application Research Laboratory Korea Electro Technology Research Institute

ZrO2 nanoparticles were prepared under high temperature and high pressure conditions by precipitation from metal nitrates with aqueous potassium hydroxide. The effects of synthesis parameters, such as the concentration of starting solution, pH of starting solution, reaction temperature and time, were discussed. The results show that the ZrO2 nanoparticles are obtained at 230-270 ℃. The average size and size distribution of the synthesized particles are below 10 nm and narrow, respectively. The XRD pattern shows that the synthesized particles are composed of crystalline. The synthesis of ZrO2 nanosized crystalline particles is possible under glycothermal conditions in ethylene glycol solution.

关键词：纳米氧化锆合成粉体加工微观结构结晶颗粒溶液pH值高压条件氢氧化钾

Impact of uneven distribution of grain characteristics on yield strength and martensitic transformation of as-hot-rolled medium-entropy alloys

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Journal of Materials Science & Technology 2024年第10期177卷 234-245页

作者： Jungwan Lee Hyojin Park Sujung Son Jae Wung bae Jin You Kim Sung Kyu Kim Jae-il Jang Hyoung seop Kim Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Metallurgical Engineering Pukyong National UniversityBusan 48513Republic of Korea Technical Research Laboratories Energy and Shipbuilding Steel Research GroupPOSCOPohangRepublic of Korea Division of Materials Science and Engineering Hanyang UniversitySeoul 04763Republic of Korea Graduate Institute of Ferrous&Eco Materials Technology(GIFT) Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Center for Heterogenic Metal Additive Manufacturing Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai 980-8577Japan

As-hot-rolled medium-entropy alloys(MEAs)with unevenly distributed grain sizes of face-centered cubic grains exhibit better yield strength without uniform elongation loss compared to cold-rolled and an-nealed *** operation of dynamic recrystallization(DRX)during several hot rolling passes leads to a wide range of grain sizes from submicrons to tens of micrometers due to the grain growth after nucleation:early recrystallized grains are coarser than recently recrystallized *** only the grain size but internal dislocation density of the recently recrystallized grain is *** the tensile deformation of the hot-rolled MEAs at-196 ℃,dislocation pile-ups in the relatively soft and fine DRX grains enhance yield stress and hetero-deformation-induced strain *** to the enhanced yield stress of the as-hot-rolled MEAs,stress-induced martensitic transformation easily ***,partially DRXed MEAs hot-rolled at 800 ℃ have lower yield stress than fully DRXed ones,hot-rolled at 900 and 1000 ℃.This is attributed to the softening effect of the stress-induced body-centered cubic martensitic transformation in unrecrystallized coarse grains prior to the yielding,which lowers the yield stress of the partially DRXed *** yielding,the martensitic transformation facilitates strain hard-ening and early necking is *** study presents a fresh outlook on the uneven distribution of grain sizes by hot rolling beneficial to mechanical responses of uniform elongation of~45%despite the as-rolled states with an advantage of simplified thermo-mechanical processes.

关键词： Dynamic recrystallization Nucleation and growth Heterogeneity Grain size distribution Deformation-induced martensitic transformation

3D printed porous titanium filled with mineralized UV-responsive chitosan hydrogel promotes cell proliferation and osteogenesis in vitro

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Journal of Materials Science & Technology 2023年第11期142卷 34-44页

作者： Jiazhao yang Fan Liu Changshun Zhou Hejie Li Gaolin yang Shiyuan Fang In-seop Lee Yi Liu Hao Bai Cen Chen The First Affiliated Hospital of USTC Division of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230001China Department of Orthodontics School of StomatologyChina Medical UniversityShenyang 110002China College of Life Sciences and Medicine Zhejiang Sci-Tech UniversityHangzhou 310018China Institute of Laser Advanced Manufacturing Zhejiang University of TechnologyHangzhou 310023China Institute of Human Materials Suwon 16514Republic of Korea State Key Laboratory of Chemical Engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Zhejiang Provincial Key Laboratory of Silkworm Bioreactor and Biomedicine Hangzhou 310018China

The modification of 3D printed porous titanium(Ti),especially for the internal pore structure,is critical and has received more attention to promoting its osteogenesis for clinical ***-violet(UV)responsive chitosan(CSMA),as an injectable filling material,was firstly incorporated into porous Ti,and then CSMA was in-situ mineralized by carbon oxide(CO_(2))diffusion(CSMA/CaCO_(3)).Their physical-chemical and biological properties were investigated in ***_(3) crystals within CSMA hydrogels were successfully deposited into pores of porous Ti,which exhibited favorable *** implants filled with CSMA/CaCO_(3) promoted adhesion and proliferation of bone mesenchymal stem cells(BMSCs).Moreover,Ti implant filled CSMA/CaCO_(3) hydrogels could increase alkaline phosphatase(ALP)activities,up-regulate osteopontin(OPN)and osteocalcin(OCN)expression levels,and enhance extracellular mineralization.3D printed porous Ti filled with mineralized UV-responsive chitosan hydrogel could promote proliferation and osteogenesis of BMSCs,and have great potential for the modification of porous Ti implants in bone tissue engineering.

关键词： Porous titanium Chitosan Ultraviolet(UV)-responsive Mineralization Osteogenesis

Electroplasticity in the Al_(0.6) CoCrFeNiMn high entropy alloy subjected to electrically-assisted uniaxial tension

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Journal of Materials Science & Technology 2023年第17期148卷 209-221页

作者： Zhiqin yang Jianxing Bao Chaogang Ding Sujung Son Zhiliang Ning Jie Xu Debin Shan Bin Guo Hyoung seop Kim State Key Laboratory of Precision Hot Processing Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Department of Materials Science and Engineering Pohang University of Science and TechnologyPohang 37673Republic of Korea Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyPohang 37673Republic of Korea

Electrically assisted deformation(EAD)was adopted in this work to overcome the shortcomings such as poor formability and easy cracking in the processing of dual-phase the Al_(0.6) CoCrFeNiMn high entropy al-loy(HEA)at room *** of the Al_(0.6) CoCrFeNiMn HEA was studied systematically using electrically assisted uniaxial *** results showed that pulse current caused the temperature gradient along the tensile direction and the temperatures of the samples increased with the current *** flow stress decreased,and the elongation increased with increasing current density during the *** the current density was 30 A mm-2,the total elongation of the samples could be increased by 50%compared to that with no *** current can reduce local stress concentration and post-pone microcracks initiation in the body-centered cubic(BCC)phases,and hence can effectively inhibit cracks and *** dislocation tangles were opened by pulse current,and the dislocation recovery was enhanced at a high current *** with dilute solid solution alloys,the lattice distortion effect,the high fraction of the BCC phases,and the dislocations in HEAs can lead to the enhancement of the local Joule heating,which accelerated dislocation slip and dislocation *** study con-firms that EAD can effectively im prove the formability of HEAs and provides theoretical guidance and an experimental basis for forming HEAs components.

关键词： Electrically-assisted deformation Electroplasticity Microstructural evolution Tensile behavior High entropy alloys

Fabrication of Fullerene-Reinforced Aluminum Matrix Nanocomposites

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Acta Metallurgica Sinica(English Letters) 2017年第10期30卷 973-982页

作者： Hamed Asgharzadeh Hamid Faraghi Hyoung seop Kim Department of Materials Engineering Faculty of Mechanical EngineeringUniversity of Tabriz Department of Materials Science and Engineering Pohang University of Science and Technology (POSTECH)

Fullerene-reinforced A1 matrix nanocomposites were fabricated by high-energy mechanical milling followed by consolidation through hot extrusion or high-pressure torsion（HPT）. The results indicate that a relatively homogeneous microstructure consisting of elongated, micrometer-sized A1 grains is formed in the hot-extruded specimens. However, the microstructure is not uniform along the radius of the HPT disks, which includes coarse grains near the center of the disk and ultrafine grains in the middle and along the edge of the specimen. Microstructural evaluations of the HPT disks indicate that A1 grain refinement occurs due to the addition of fullerene, as grain size is reduced to 60 nm from 118 nm. The formation of the harmful aluminum carbide phase is not detected during the fabrication of Al/C（60） nanocomposites. The hardness, yield stress, and ultimate tensile strength of the Al-2 vol.% C（60） nanocomposites are about 27-160% higher than those of the monolithic A1 samples, revealing the effective strengthening of fullerene particles in A1 matrix. Moreover,mechanical properties of the Al/fullerene nanocomposites are significantly enhanced（59-272%） by utilizing HPT in comparison to hot-extruded specimens due to their much finer A1 grain structure. The reduction in the number and the size of the dimples, as well as the formation of smooth regions on the tensile fracture surface of Al/C（60）, results in their overall lower ductility compared to monolithic Al.

关键词： Aluminum Fullerene High-pressure torsion Hot extrusion Microstructure Mechanical properties

Understanding the creep behaviors and mechanisms of Mg-Gd-Zn alloys via machine learning

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Journal of Magnesium and Alloys 2024年第8期12卷 3281-3291页

作者： Shuxia Ouyang Xiaobing Hu Qingfeng Wu Jeong Ah Lee Jae Heung Lee Chenjin Zhang Chunhui Wang Hyoung seop Kim Guangyu yang Wanqi Jie Graduate Institute of Ferrous and Eco Materials Technology(GIFT) Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Xi’an Rare Metal Materials lnstitute Co.Ltd Xi’an 710016China Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea DepartmentAdvanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai 980-8577Japan Institute for Convergence Research and Education in Advanced Technology Yonsei UniversitySeoul 03722South Korea

Mg-Gd-Zn based alloys have better creep resistance than other Mg alloys and attract more attention at elevated ***,the multiple alloying elements and various heat treatment conditions,combined with complex microstructural evolution during creep tests,bring great challenges in understanding and predicting creep *** this study,we proposed to predict the creep properties and reveal the creep mechanisms of Mg-Gd-Zn based alloys by machine *** the one hand,the minimum creep rates were effectively predicted by using a support vector regression *** complex and nonmonotonic effects of test temperature,test stress,alloying elements,and heat treatment conditions on the creep properties were *** the other hand,the creep stress exponents and creep activation energies were calculated by machine learning to analyze the variation of creep mechanisms,based on which the constitutive equations of Mg-Gd-Zn based alloys were *** study introduces an efficient method to comprehend creep behaviors through machine learning,offering valuable insights for the future design and selection of Mg alloys.

关键词： Mg-Gd-Zn based alloys Machine learning Creep rate Creep mechanism Constitutive equation