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Microstructure and Mechanical Properties of Continuous Welded 50N Rail
Wookjin Choi, Min Ji Song, Nam-Hyoung Lim, Soo Yeol Lee
Korean J. Met. Mater. 2019;57(12):755-763.   Published online 2019 Dec 5
DOI: https://doi.org/10.3365/KJMM.2019.57.12.755

Abstract
Rails are subjected to repeated stresses due to wheel-rail contact during train service. Rails under stress conditions undergo microstructural changes, and these cause degradations of the structural integrity and lifetime of rails. In this study, three different rails (newly-manufactured rail, newly-manufactured head-hardened rail, and worn (used) rail) were compared to..... More

      
Improvement of the Hydrogen-Release Features of Mg-Graphene Composite by Adding Nickel via Reactive Ball Milling
Eunho Choi, Young Jun Kwak, Myoung Youp Song
Korean J. Met. Mater. 2019;57(10):663-672.   Published online 2019 Sep 6
DOI: https://doi.org/10.3365/KJMM.2019.57.10.663

Abstract
The dehydrogenation rates of graphene-added Mg (named Mg-5graphene) were very low at 573 K and 593 K. Ni was added to increase the dehydrogenation rates of graphene-added Mg. Samples (designated as Mg-2.5Ni-2.5graphene) with a composition of 95 wt% Mg + 2.5 wt% Ni + 2.5 wt% graphene were prepared by..... More

                        
Effect of Rapid Thermal Annealing Temperature on Oxygen-Deficient TiO<sub>2-x</sub>-based Thin-Film Transistors Deposited by RF Magnetron Sputtering
RF 마그네트론 스퍼터링으로 증착한 산소 결핍 구조 TiO2-x 박막 트랜지스터에 미치는 급속 열처리 온도의 영향
Han-Sang Kim, Jae-Yun Lee, Sung-Jin Kim
김한상, 이재윤, 김성진
Korean J. Met. Mater. 2019;57(7):438-446.   Published online 2019 Jun 5
DOI: https://doi.org/10.3365/KJMM.2019.57.7.438

Abstract
We investigated the effect of rapid thermal annealing (RTA) temperature report on oxygendeficient rutile TiO2-x thin-film transistors deposited by RF magnetron sputtering. Amorphous TFTs that use TiO2-x semiconductors as an active layer can be fabricated by low-temperature process and show remarkable electrical performance. The RTA post-annealing process provides greater production..... More

                        
Tin Microcrystals Synthesized by Thermal Chemical Vapor Deposition in a Hydrogen-Reducing Atmosphere
Daseul Ham, Won Jeong, Hyon Chol Kang
Korean J. Met. Mater. 2019;57(6):390-395.   Published online 2019 May 16
DOI: https://doi.org/10.3365/KJMM.2019.57.6.390

Abstract
We demonstrate a synthetic route to high-quality Sn microcrystals using thermal chemical vapor deposition (CVD) in a hydrogen-reducing atmosphere. During thermal CVD with SnO2 powder, a mixture of Ar and H2 (4%) gases was used as a carrier gas to maintain a hydrogen reduction environment. Hydrogen maintained a reduction environment..... More

                        
Influence of Film Thickness on the Electrical and Optical Properties of ZnO/Ag/SnO<sub>2</sub> Tri-Layer Films
ZnO/Ag/SnO2 적층박막의 두께 변화에 따른 전기적, 광학적 특성 연구
Yu-Sung Kim, Jin-Young Choi, Yun-Je Park, Su-Hyeon Choe, Young-Min Kong, Daeil Kim
김유성, 최진영, 박윤제, 최수현, 공영민, 김대일
Korean J. Met. Mater. 2019;57(5):324-327.   Published online 2019 May 5
DOI: https://doi.org/10.3365/KJMM.2019.57.5.324

Abstract
ZnO/Ag/SnO2 (ZAS) tri-layer films were prepared on glass substrates via RF and DC magnetron sputtering, and then the influence of the thickness of the ZnO and SnO2 layers on the optical and electrical properties of the ZAS films was investigated. As deposited ZnO 50 nm/Ag 10 nm/SnO2 50 nm films..... More

                        
Hydrogen Storage Properties of Mg Alloy Prepared by Incorporating Polyvinylidene Fluoride via Reactive Milling
Myoung Youp Song, Young Jun Kwak
Korean J. Met. Mater. 2018;56(12):878-884.   Published online 2018 Dec 5
DOI: https://doi.org/10.3365/KJMM.2018.56.12.878

Abstract
In the present work, we selected a polymer, polyvinylidene fluoride (PVDF), as an additive to improve the hydrogenation and dehydrogenation properties of Mg. 95 wt% Mg + 5 wt% PVDF (designated Mg-5PVDF) samples were prepared via milling in hydrogen atmosphere (reactive milling), and the hydrogenation and dehydrogenation characteristics of the..... More

                           Cited By 3
Raising the Dehydrogenation Rate of a Mg-CMC (Carboxymethylcellulose, Sodium Salt) Composite by Alloying Ni via Hydride-Forming Milling
Myoung Youp Song, Eunho Choi, Young Jun Kwak
Korean J. Met. Mater. 2018;56(8):620-627.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.620

Abstract
In our previous work, samples with a composition of 95 wt% Mg + 5 wt% CMC (Carboxymethylcellulose, Sodium Salt, [C6H7O2(OH)x(C2H2O3Na)y]n) (named Mg-5 wt%CMC) were prepared through hydride-forming milling. Mg-5 wt%CMC had a very high hydrogenation rate but a low dehydrogenation rate. Addition of Ni to Mg is known to increase..... More

                           Cited By 3
Hydrogen Uptake and Release Characteristics of Mg-xTaF<sub>5</sub>-xVCl<sub>3</sub> (x=1.25, 2.5, and 5)
Myoung Youp Song, Young Jun Kwak
Korean J. Met. Mater. 2018;56(8):611-619.   Published online 2018 Aug 5
DOI: https://doi.org/10.3365/KJMM.2018.56.8.611

Abstract
TaF5 and VCl3 were chosen as additives to enhance the hydrogen uptake and release rates of Mg. The total content of the additives was not more than 10 wt% since too high content reduces the fraction of Mg and thus the hydrogen storage capacity of the alloys. Samples with compositions..... More

                           Cited By 5
Development of a Mg-Based Alloy with a Hydrogen-Storage Capacity of 7 wt% by Adding a Polymer CMC via Transformation-Involving Milling
Myoung Youp Song, Eunho Choi, Young Jun Kwak
Korean J. Met. Mater. 2018;56(5):392-399.   Published online 2018 May 8
DOI: https://doi.org/10.3365/KJMM.2018.56.5.392

Abstract
The addition of CMC (Carboxymethylcellulose, Sodium Salt) may improve the hydriding and dehydriding properties of Mg since it has a relatively low melting point and the melting of CMC during transformation-involving milling may put the milled samples in good states to absorb and release hydrogen rapidly. Samples with compositions of..... More

         Cited By 5
Hydrogen Absorption and Release Properties of MgH<sub>2</sub>, Mg<sub>2</sub>Ni, and Ni-Added Mg via Reactive Mechanical Grinding
Seong-Hyeon Hong, Myoung Youp Song
Korean J. Met. Mater. 2018;56(2):155-162.   Published online 2018 Feb 5
DOI: https://doi.org/10.3365/KJMM.2018.56.2.155

Abstract
In this work, MgH2, Mg2Ni, and Ni were added to Mg in order to improve the hydrogen-storage properties of Mg. A 84 wt% Mg + 10 wt% MgH2 + 5 wt% Mg2Ni + 1 wt% Ni sample (designated the Mg-based sample) was prepared by milling under a hydrogen atmosphere in..... More

      
Enhancement of the Hydrogen-Storage Characteristics of Mg by Adding Mg<sub>2</sub>Ni and Ni to MgH<sub>2</sub> via High Energy Ball Milling in Hydrogen Atmosphere
Seong-Hyeon Hong, Young Jun Kwak, Myoung Youp Song
Korean J. Met. Mater. 2018;56(1):59-65.   Published online 2018 Jan 1
DOI: https://doi.org/10.3365/KJMM.2018.56.1.59

Abstract
In this work, Mg2Ni and Ni were added to MgH2 in order to improve the hydrogen-storage properties of Mg. A 94 wt% MgH2+5 wt% Mg2Ni+1wt% Ni (named 94MgH2+5Mg2Ni+1Ni) sample was prepared by milling in a hydrogen atmosphere in a planetary ball mill for 5 h. The Mg2Ni was hydrided during..... More

         Cited By 5
Capture and Solidification of Rare Earth Nuclide (Nd) in LiCl-KCl Eutectic Salt Using a Synthetic Inorganic Composite
무기합성매질을 이용한 LiCl-KCl 공융염 내 희토류 핵종(Nd)의 포집 및 고화
Na-Young Kim, Hee-Chul Eun, Hwan-Seo Park, Do-Hee Ahn
김나영, 은희철, 박환서, 안도희
Korean J. Met. Mater. 2017;55(6):419-426.   Published online 2017 Jun 1
DOI: https://doi.org/10.3365/KJMM.2017.55.6.419

Abstract
In this study, neodymium (Nd) nuclides in LiCl-KCl eutectic salts were captured and solidified using a synthetic inorganic composite (Li2O-SiO2-Al2O3-B2O3), a process that allows the selective capture of Nd and fabrication of a composite with Nd captured from waste, without additional additives or mixing. The Nd nuclides in the LiCl-KCl..... More

      
Material Analysis & Characterization
Effects of Doping Concentration on the Structural and Optical Properties of Spin-Coated In-doped ZnO Thin Films Grown on Thermally Oxidized ZnO Film/ZnO Buffer Layer/Mica Substrate
Byunggu Kim, Jae-Young Leem
Korean J. Met. Mater. 2017;55(1):67-71.   Published online 2017 Jan 5
DOI: https://doi.org/10.3365/KJMM.2017.55.1.67

Abstract
ZnO buffer layers were deposited on mica substrates using a sol-gel spin coating method. Then, a thin film of metallic Zn was deposited onto the ZnO buffer layer/mica substrate using a thermal evaporator, and the deposited Zn thin films were then thermally oxidized in a furnace at 500 ℃ for..... More

         Cited By 1
Optical Devices & Energy Materials
A Study on the Trapping Characteristics of Rhenium Oxide Using Ca(OH)<sub>2</sub>
Ca(OH)2를 이용한 레늄 산화물의 포집반응 특성 연구
Tae-Kyo Lee, Hee-Chul Eun, Jung-Hoon Choi, Ki-Rak Lee, Seung-Youb Han, Hwan-Seo Park
이태교, 은희철, 최정훈, 이기락, 한승엽, 박환서
Korean J. Met. Mater. 2017;55(1):53-59.   Published online 2017 Jan 5
DOI: https://doi.org/10.3365/KJMM.2017.55.1.53

Abstract
The objective of this study was to obtain basic data for trapping gaseous technetium (Tc) oxide generated from the voloxidation process in spent nuclear fuel pyroprocessing. Rhenium (Re) and Ca(OH)2 were used as surrogates for the technetium and a trapping material, respectively. The trapping characteristics of rhenium oxide were investigated..... More

      
Hydrogen Sorption of Pure Mg and Niobium (V) Fluoride-Added Mg Alloys Prepared by Planetary Ball Milling in Hydrogen
Hye Ryoung Park, Young Jun Kwak, Seong Ho Lee, Myoung Youp Song
Korean J. Met. Mater. 2016;54(12):916-924.   Published online 2016 Dec 5
DOI: https://doi.org/10.3365/KJMM.2016.54.12.916

Abstract
In this work, niobium (V) fluoride was selected as an additive to heighten the hydrogen sorption rates of Mg. Specimens of pure Mg, 5 wt% niobium fluoride-added Mg, and 10 wt% niobium fluoride-added Mg were prepared by planetary ball milling in hydrogen. The hydrogen sorption properties of the specimens were..... More

         Cited By 4
Effect of Post-Deposition Annealing on the Structural, Optical and Electrical Properties of Ti-doped Indium Oxide Thin Films
Sung-Bo Heo, Hyun-Joo Moon, Jeong-Hyeon Oh, Young-Hwan Song, Tae-Young Eom, Jun-Ho Kim, Daeil Kim
Korean J. Met. Mater. 2016;54(10):775-779.   Published online 2016 Oct 5
DOI: https://doi.org/10.3365/KJMM.2016.54.10.775

Abstract
Ti-doped In2O3 (TIO) thin films were deposited on glass substrates by RF magnetron sputtering. The films were then annealed at 100, 200 or 300 °C for 30 min to investigate the effects of the annealing temperature on the films’ structural, electrical and optical properties. The films annealed at 200 °C..... More

      
Optical Devices & Energy Materials
Properties of a Counter Electrode with Nickel Silicides in a Dye Sensitized Solar Cell
니켈실리사이드 상대전극을 이용한 염료감응형 태양전지의 물성 연구
Kwangbae Kim, Yunyoung Noh, Minkyoung Choi, Ohsung Song
김광배, 노윤영, 최민경, 송오성
Korean J. Met. Mater. 2016;54(8):615-620.   Published online 2016 Aug 5
DOI: https://doi.org/10.3365/KJMM.2016.54.8.615

Abstract
Nickel silicide was used as a counter electrode to replace the Pt catalytic layer of a dye-sensitized solar cell (DSSC) device. 50 nm Si/ 50 nm Ni was formed on glass or quartz by sputtering, and nickel silicides were formed by vacuum heat treatments at 450 and 800 ℃ for..... More

         Cited By 1
Synthesis and Photoluminescence Studies of ZnO Films Using Vapor Phase Transport Combined With Rapid Heating
Iksoo Ji, Jae-Young Leem
Korean J. Met. Mater. 2016;54(8):609-614.   Published online 2016 Aug 5
DOI: https://doi.org/10.3365/KJMM.2016.54.8.609

Abstract
The vapor phase transport (VPT) process is usually used for the growth of one-dimensional nanostructures rather than for film deposition. In this study, for the first time, we report on the fabrication and optical propeties of ZnO film produced by VPT combined with rapid heating. The X-ray diffraction results showed..... More

      
Microstructure and Mechanical Properties of Continuous Welded 50N Rail
Wookjin Choi1, Min Ji Song1, Nam-Hyoung Lim2, and Soo Yeol Lee1,*

Abstract
Rails are subjected to repeated stresses due to wheel-rail contact during train service. Rails under stress conditions undergo microstructural changes, and these cause degradations of the structural integrity and lifetime of rails. In this study, three different rails (newly-manufactured rail, newly-manufactured headhardened rail, and worn (used) rail) were compared to... More
Microstructure and Mechanical Properties of Continuous Welded 50N Rail
Wookjin Choi1, Min Ji Song1, Nam-Hyoung Lim2, and Soo Yeol Lee1,*

Published online 1999 Nov 30
Abstract
Rails are subjected to repeated stresses due to wheel-rail contact during train service. Rails under stress conditions undergo microstructural changes, and these cause degradations of the structural integrity and lifetime of rails. In this study, three different rails (newly-manufactured rail, newly-manufactured headhardened rail, and worn (used) rail) were compared to... More
Microstructure and Mechanical Properties of Continuous Welded 50N Rail
Wookjin Choi1, Min Ji Song1, Nam-Hyoung Lim2, and Soo Yeol Lee1,*

Published online 1999 Nov 30
Abstract
Rails are subjected to repeated stresses due to wheel-rail contact during train service. Rails under stress conditions undergo microstructural changes, and these cause degradations of the structural integrity and lifetime of rails. In this study, three different rails (newly-manufactured rail, newly-manufactured headhardened rail, and worn (used) rail) were compared to examine the effects... More
Microstructure and Mechanical Properties of Continuous Welded 50N Rail
Wookjin Choi, Min Ji Song, Nam-Hyoung Lim, Soo Yeol Lee
Published online 1999 Nov 30
Abstract
Rails are subjected to repeated stresses due to wheel-rail contact during train service. Rails under stress conditions undergo microstructural changes, and these cause degradations of the structural integrity and lifetime of rails. In this study, three different rails (newly-manufactured rail, newly-manufactured head-hardened rail, and worn (used) rail) were compared to... More
Microstructure and Mechanical Properties of Continuous Welded 50N Rail

Published online 1999 Nov 30
Abstract
Rails are subjected to repeated stresses due to wheel-rail contact during train service. Rails under stress conditions undergo microstructural changes, and these cause degradations of the structural integrity and lifetime of rails. In this study, three different rails (newly-manufactured rail, newly-manufactured head-hardened rail, and worn (used) rail) were compared to... More
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