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Microstructure and Mechanical Properties of TiB-Containing Al–Zn Binary Alloys

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Journal of Materials Science & Technology 2016年第7期32卷 653-659页

作者： Sang-Soo Shin Gil-Yong Yeom Tae-Yang Kwak ik-min park Department of Materials Science and Engineering Pusan National University Busan 609-735 Republic of Korea Liquid Processing & Casting Technology R&BD Group Korea Institute of Industrial Technology Incheon 21999 Republic of Korea

The microstructure and mechanical properties of newly developed Al-35Zn cast alloys with TiB refiner addition were evaluated by X-ray diffractometry, optical microscopy, and scanning electron microscopy coupled with energy dispersive spectrometry. The microstructure of these alloys featured α-Al den- drites surrounded by AI-Zn （α ＋ rI） eutectic structures. After the addition of TiB refiner, the alloy grain sizes decreased, and its morphology abruptly changed from dendritic to equiaxed grains. Such an im- proved microstructure of the modified alloys was accompanied by a significant increase in the tensile strength and elongation percentage compared to those of the AI-Zn or Zn-Al-based alloys. The results showed that with the increase of TiB content up to 0.05%, the morphology of α-Al dendrites and α ＋ T1 phases changed from coarse dendrite and lamellar structures into independent and fine ones. Based on these results, the effect of TiB refiner addition on the microstructure and mechanical properties of the AI-35Zn binary alloys was investigated.

关键词： Al-Zn(-Cu) alloyEutectic structureHigh strengthTiB2

Effect of Sub-T_g Annealing on the Corrosion Resistance of the Cu–Zr Amorphous Alloys

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Acta Metallurgica Sinica(English Letters) 2018年第3期31卷 273-280页

作者： Sang-Soo Shin Hong-Kyu Kim Jae-Chul Lee ik-min park Department of Materials Science and Engineering Pusan National University Advanced Analysis Center Korea Institute of Science and Technology Department of Materials Science and Engineering Korea University

Despite the economy of material cost and excellent toughness of Cu-based amorphous alloys,especially CusoZrso,their poor corrosion resistance to a chloride medium limits their widespread *** this study,corrosion tests were performed on the CusoZrso amorphous alloy with different degrees of short-range order,which were prepared by annealing below the glass transition temperature（Tg）.It was found that the corrosion resistance of amorphous alloys is improved to a significant level when the alloys were heated below *** studies showed that thermally activated relaxation process of created disorder,which occurs during sub-Tg annealing,is responsible for the improvement in the corrosion *** dynamics simulations performed on the Cu-Zr amorphous alloys demonstrated that the relaxation process of the alloys is associated with the formation of energetically stable icosahedra and icosahedron-like *** study highlights the effects of sub-Tg annealing on the improvement in the corrosion resistance of the amorphous alloys from the viewpoint the relaxation process of the short-range orders.

关键词： Amorphous alloys Corrosion Annealing Molecular dynamics Electrochemical performance

Electrochemically Deposited CZTSSe Thin Films for Monolithic Perovskite Tandem Solar Cells with Efficiencies Over 17%

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Energy & Environmental Materials 2024年第1期7卷 151-156页

作者： Sun Kyung Hwang ik Jae park Se Won Seo Jae Hyun park So Jeong park Jin Young Kim Department of Materials Science and Engineering Seoul National University Department of Applied Physics Sookmyung Women’s University Research Institute of Advanced Materials and Systems Sookmyung Women’s University Research Institute of Advanced Materials (RIAM) Seoul National University

In spite of the high potential economic feasibility of the tandem solar cells consisting of the halide perovskite and the kesterite Cu2ZnSn（S,Se）4（CZTSSe）,they have rarely been demonstrated due to the difficulty i... 详细信息

关键词： CZTSSe monolithic tandem solar cells perovskite solution process surface roughness control

Ce对铸造Mg-5Al-2Si合金中Mg2Si相改性及力学性能的影响

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铸造 2019年第7期68卷 679-683页

作者：朱文杰李德江曾小勤 Seul Bi Lee ik min park 上海交通大学材料科学与工程学院上海200240 釜山国立大学韩国釜山46287

利用X射线衍射、光学显微镜和扫描电镜等分析测试手段,研究了不同Ce添加量对重力铸造Mg-5Al-2Si合金显微组织和力学性能的影响规律。结果表明,添加Ce以后,合金中主要存在α-Mg相、汉字状Mg2Si相、多边形Mg2Si相、细小的Al11Ce3和CeSi2相... 详细信息

利用X射线衍射、光学显微镜和扫描电镜等分析测试手段,研究了不同Ce添加量对重力铸造Mg-5Al-2Si合金显微组织和力学性能的影响规律。结果表明,添加Ce以后,合金中主要存在α-Mg相、汉字状Mg2Si相、多边形Mg2Si相、细小的Al11Ce3和CeSi2相;稀土Ce的加入改变了合金中Mg2Si相的尺寸、形貌与分布;随着Ce含量增加,汉字状Mg2Si相的平均长度大幅度减小,共晶Mg2Si相的形貌由粗大的汉字状转变为多边形状;当Ce添加量为0.4%时,试验合金的力学性能达到最佳,而增加至0.8%时,合金的力学性能反而下降。拉伸断口形貌也揭示了合金的力学性能情况。因此,适当的Ce添加量(0.4%)可以有效地改性Mg2Si相,从而提高合金的强度和伸长率。

关键词：耐热镁合金 Mg-Al-Si系合金汉字状Mg2Si相显微组织力学性能

Paleozoic tectonic evolution of the proto-Korean Peninsula along the East Asian continental margin from detrital zircon U-Pb geochronology and Hf isotope geochemistry

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Geoscience Frontiers 2024年第1期15卷 97-117页

作者： Yirang Jang Sung Won Kim Vinod O.Samuel Sanghoon Kwon Seung-ik park M.Santosh Keewook Yi Department of Earth and Environmental Sciences Chonnam National UniversityGwangju 61186Republic of Korea Geology Division Korea Institute of Geoscience and Mineral ResourcesDaejeon 34132Republic of Korea Department of Earth System Sciences Yonsei UniversitySeoul 03722Republic of Korea Department of Geology Kyungpook National UniversityDaegu 41566Republic of Korea School of Earth Sciences and Resources China University of Geosciences BeijingBeijing 100083China Department of Earth Science University of AdelaideAdelaide SA 5005Australia Yonsei Frontiers Lab Yonsei UniversitySeoul 03722Republic of Korea Division of Earth and Environmental Sciences Korea Basic Science InstituteChungbuk 28119Republic of Korea

Detrital zircon geochronology and Hf isotope analysis can be used for inferring provenance characteristics,and to evaluate the tectonic evolution of sedimentary basins and their link with regional *** Paleozoic sequences of the Okcheon Belt consist of the Lower Paleozoic Joseon and the Upper Paleozoic Pyeongan supergroups with Middle Paleozoic hiatus locally on top of the Neoproterozoic bimodal volcanic rocks,reflecting an intracontinental rift setting between the two basements(*** and Yeongnam massifs)at southern part of the Korean *** detrital zircon U-Pb ages and Lu-Hf isotope results show that all these Paleozoic strata commonly have Paleoproterozoic and Paleozoic zircon ages with rare Meso-to Neoproterozoic *** individual zircon populations display following features,allowing estimation of their sedimentary provenances:(i)The Paleoproterozoic zircons(ca.1.85 Ga and 2.50 Ga)with similar ranges ofεHf(t)values are most common in the basement rocks of the Korean Peninsula,and were sourced from both the Gyeonggi and Yeongnam massifs.(ii)The Meso-to Neoproterozoic zircons,preserved only in the Middle to Late Cambrian clastic sedimentary rocks within the carbonate sequences probably reflect proximal provenance.(iii)The youngest Paleozoic zircons of each formation,almost coincident with their deposition ages,suggest presence of syndepositional magmatism,indicating proximal magmatic sources during their deposition.(iv)The Cambrian-Ordovician zircons,from the Lower Paleozoic sequences,but rare in the successive Upper Paleozoic sequences,suggest a provenance change after the hiatus between the two sedimentary successions.(v)The Permian zircons showing differentεHf(t)values indicate that detrital sources were varied at that *** integrated results in our study suggest provenance variability linked to diverse tectonic environments,reflecting prolonged subduction-related crustal evolution of the proto-Korean Peninsula during the Paleozo

关键词： Detrital zircon U-Pb and Hf isotopes Paleozoic metasedimentary rocks Okcheon Belt Taebaeksan zone Korean Peninsula

Evaluation of the safety of anterior capsule staining with trypan blue under air: a retrospective analysis

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International Journal of Ophthalmology(English edition) 2022年第3期15卷 432-437页

作者： Young min park Jong Soo Lee Ji Eun Lee Yeon Ji Jo ik Soo Byon Sung Who park Centum Bright Light Eye Clinic 20Centum 2-roHaeundaeguBusanKorea 48060Republic of Korea Department of Ophthalmology School of MedicinePusan National University and Medical Research InstitutePusan 49241Republic of Korea

AIM: To evaluate the safety of using 0.03% trypan blue under air for anterior capsule staining in cataract ***: The current study involved a retrospective analysis of the medical records of 86 patients with vitreous hemorrhage, who underwent pars plana vitrectomy and cataract *** patients were classified into two *** trypan blue group(n=45) comprised patients who underwent anterior capsule staining with 0.03% trypan blue under an air *** control group(n=41) comprised of patients who underwent intracameral illuminator-assisted *** status of endothelial cell density(ECD) in both the groups was ***: The trypan blue group displayed significant decline in ECD at 1 mo(7.91% loss, P<0.001) and 3 mo(9.65% loss, P<0.001) after the surgery, whereas no significant changes were observed in the control ***, the number of patients who did not display a postoperative decline in ECD was significantly higher in the control group(43.9%;18 patients) than in the trypan blue group(17.1%;7 patients, P=0.004).CONCLUSION: Anterior capsule staining with trypan blue under the air bubble would not be as safe as the intracameral *** ECD loss might be attributed to the air bubble rather than to the deleterious effects of 0.03% trypan *** studies are required to clarify this.

关键词： anterior capsule cataract endothelium trypan blue vitreous hemorrhage

Macular hole closure induced by intravitreal injection in diabetic macular edema

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International Journal of Ophthalmology(English edition) 2022年第10期15卷 1720-1722页

作者： Sang Yoon Kim Han Jo Kwon Sung Who park ik Soo Byon Seung min Lee Department of Ophthalmology Research Institute for Convergence of Biomedical Science and TechnologyPusan National University Yangsan HospitalYangsan 50612Republic of Korea Department of Ophthalmology Biomedical Research InstitutePusan National University HospitalBusan 49241Republic of Korea Pusan National University School of Medicine Yangsan 50612Republic of Korea

Dear Editor,Macular hole(MH)formation is uncommon in patients with diabetic macular edema(DME).Few cases of MH associated with DME treatment have been described,including a report of four out of eight eyes with MH and diabetic retinopathy(DR)having DME[1].However,no case of resolution of MH after DME treatment has been *** report three consecutive cases of MH closure achieved by intravitreal injection for DME treatment.

关键词： injection diabetic edema

Nanoscale visualization of hot carrier generation and transfer at non-noble metal and oxide interface

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Journal of Materials Science & Technology 2022年第3期98卷 151-159页

作者： Ranveer Singh Qadeer Akbar Sial Seung-ik Han Sanghee Nah Ji-Yong park Hyungtak Seo Department of Materials Science and Engineering Ajou UniversitySuwon16499Republic of Korea Department of Energy Systems Research Ajou UniversitySuwon16499Republic of Korea Seoul Center Korea Basic Science InstituteSeoul02841Republic of Korea Department of Physics Ajou UniversitySuwon16499Republic of Korea

The conversion efficiency of energy-harvesting devices can be increased by utilizing hot-carriers(HCs).However,due to ultrafast carrier-carrier scattering and the lack of carrier injection dynamics,HC-based devices have low *** the present work,we report the effective utilization of HCs at the nanoscale and their transfer dynamics from a non-noble metal to a metal oxide interface by means of real-space photocurrent mapping by using local probe techniques and conducting femtosecond transient absorption(TA)*** photocurrent maps obtained under white light unambiguously show that the HCs are injected into the metal oxide layer from the TiN layer,as also confirmed by conductive atomic force *** addition,the increased photocurrent in the bilayer structure indicates the injection of HCs from both layers due to the broadband absorption efficiency of TiN layer,passivation of the surface states by the top TiN layer,and smaller barrier height of the ***,electrostatic force microscopy and Kelvin probe force microscopy provide direct evidence of charge injection from TiN to the MoO_(x)film at the *** TA absorption spectra show a strong photo-bleaching signal over wide spectral range and ultrafast decaying behavior at the picosecond time scale,which indicate efficient electron transfer from TiN to MoO_(x).Thus,our simple and effective approach can facilitate HC collection under white light,thereby achieving high conversion efficiency for optoelectronic devices.

关键词： Non-noble metal Hot carrier Real-space photocurrent mapping Local-probe force microscopy

Tailored BiVO_(4)/In_(2)O_(3)nanostructures with boosted charge separation ability toward unassisted water splitting

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Carbon Energy 2023年第6期5卷 45-59页

作者： Mi Gyoung Lee Jin Wook Yang ik Jae park Tae Hyung Lee Hoonkee park Woo Seok Cheon Sol ALee Hyungsoo Lee Su Geun Ji Jun min Suh Jooho Moon Jin Young Kim Ho Won Jang Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoulRepublic of Korea Country Department of Applied Physics Sookmyung Women's UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Yonsei UniversitySeoulRepublic of Korea Advanced Institute of Convergence Technology Seoul National UniversitySuwonRepublic of Korea

The development of new heterostructures with high photoactivity is a breakthrough for the limitation of solar-driven water ***,we first introduce indium oxide(In_(2)O_(3))nanorods(NRs)as a novel electron transport layer for bismuth vanadate(BiVO_(4))with a short charge diffusion ***_(2)O_(3)NRs reinforce the electron transport and hole blocking of BiVO_(4),surpassing the state-of-the-art photoelectrochemical performances of BiVO_(4)-based ***,a tannin-nickel-iron complex(TANF)is used as an oxygen evolution catalyst to speed up the reaction *** final TANF/BiVO_(4)/In_(2)O_(3)NR photoanode generates photocurrent densities of 7.1 mAcm^(−2) in sulfite oxidation and 4.2 mA cm^(−2) in water oxidation at 1.23 V versus the reversible hydrogen ***,the“artificial leaf,”which is a tandem cell with a perovskite/silicon solar cell,shows a solar-to-hydrogen conversion efficiency of 6.2%for unbiased solar water *** reveal significant advances in the photoactivity of TANF/BiVO_(4)/In_(2)O_(3)NRs from the tailored nanostructure and band structure for charge dynamics.

关键词： bismuth vanadate heterojunction indium oxide nanostructure photoelectrochemical water splitting