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Volume 57(7); Jul 2019
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Research Papers
475 Study of Shape and Microstructure Changes of Ta Linear for Building an Explosively Formed Penetrator
탄탈륨 라이너의 폭발성형관통자 형성 시 형상 및 조직 변화 연구
Sung Taek Park, Ju Yeong Kim, Gwang Lyeon Kim, Hyun-Su Kang, Kyeong Won Oh, Hyung-Ki Park, Yi Hwa Song
박성택, 김주영, 김광련, 강현수, 오경원, 박형기, 송이화
Korean J. Met. Mater. 2019;57(8):475-481.   Published online 2019 Aug 5
DOI: https://doi.org/10.3365/KJMM.2019.57.8.475

Abstract
An explosively formed penetrator (EFP) is a kind of kinetic energy warhead that contains a metal linear structure. After exploding, the linear structure in the EFP is deformed and hits the target as a form of aero-stable long-rod penetrator. To achieve high penetration performance, Ta is commonly used as the..... More

                        
482 Effect of Rolling Temperature on the Microstructural Characteristics of High-Speed-Rolled Mg Alloy with Initial Non-Basal Texture
비기저면 집합조직을 가지는 마그네슘 합금의 고속압연 온도 변화에 따른 압연재 미세조직 변화
Su Jin Lee, Ye Jin Kim, Jeong Hun Lee, Sung Hyuk Park
이수진, 김예진, 이정훈, 박성혁
Korean J. Met. Mater. 2019;57(8):482-490.   Published online 2019 Jul 4
DOI: https://doi.org/10.3365/KJMM.2019.57.8.482

Abstract
In this study, the effects of rolling temperature on the microstructural characteristics of a highspeed-rolled Mg alloy with a non-basal texture were investigated. To this end, commercial AZ31 alloy samples in which the basal poles of most grains were tilted at an angle of 45° from the normal direction (ND)..... More

                        
491 Hydrogen-Induced Cracking of Laser Beam and Gas Metal Arc Welds on API X65 Steel
Junghoon Lee, Myeonghyun Kim, Yeongdo Park, Cheolho Park, Cheolhee Kim, Namhyun Kang
Korean J. Met. Mater. 2019;57(8):491-498.   Published online 2019 Jul 11
DOI: https://doi.org/10.3365/KJMM.2019.57.8.491

Abstract
Hydrogen-induced cracking (HIC) behavior was analyzed for gas metal arc (GMA) and laser beam (LB) welds on American Petroleum Institute (API) X65 steel. The GMA welds consisted of acicular ferrite (AF) with some widmanstatten ferrite (WF), while the LB welds had bainitic ferrite (BF) with some AF. The welds and..... More

                        
499 Separation of Tb(III) and Dy(III) from Chloride Solution by Extraction and Scrubbing with Ionic Liquid Prepared with Cyanex 272 and Aliquat 336
Cyanex 272와 Aliquat 336으로 제조한 이온성액체로 염산용액에서 추출과 세정에 의한 터븀(III) 및 디스프로슘(III)의 분리
Chang Geun Oh, Seong Ho Son, Man Seung Lee
오창근, 손성호, 이만승
Korean J. Met. Mater. 2019;57(8):499-505.   Published online 2019 Jul 8
DOI: https://doi.org/10.3365/KJMM.2019.57.8.499

Abstract
Terbium and dysprosium are rare earth elements which are employed in the manufacture of advanced materials. Separating Tb(III) and Dy(III) is very complicated because their chemical properties are similar. In order to develop a separation process based on solvent extraction, extraction and scrubbing experiments were conducted using weak hydrochloric solutions..... More

                        
506 Effects of Rapid Thermal Annealing on the Structural, Optical, and Electrical Properties of ZnO/Ag/SnO2 Tri-Layer Films
Su-Hyeon Choe, Yu-Sung Kim, Jin-Young Choi, Yun-Je Park, Byung-Chul Cha, Young-Min Kong, Daeil Kim
Korean J. Met. Mater. 2019;57(8):506-509.   Published online 2019 Aug 5
DOI: https://doi.org/10.3365/KJMM.2019.57.8.506

Abstract
ZnO 50 nm/Ag 10 nm/SnO2 50 nm (ZAS) tri-layer films were deposited on a glass substrate by RF and DC magnetron sputtering and then underwent rapid thermal annealing in a low vacuum of 1×10-3 Torr to investigate the effects of post-deposition annealing on the optical and electrical properties of the..... More

                        
510 Photocatalytic Characterization of TiO2 Nanotubes with Pd Particles Synthesized by Photoreduction Process
광환원반응을 통한 TiO2/Pd 복합광촉매 제조와 광촉매 특성
Jong-Ho Lee, Hong-Joo Ahn, Jeong-Il Youn, Young-Jig Kim, Su-Jeong Suh, Han-Jun Oh
이종호, 안홍주, 윤정일, 김영직, 서수정, 오한준
Korean J. Met. Mater. 2019;57(8):510-520.   Published online 2019 Jul 8
DOI: https://doi.org/10.3365/KJMM.2019.57.8.510

Abstract
To decompose dye in aqueous solution, Pd nanoparticle-decorated TiO2 nanotube photocatalysts were fabricated through electrochemical anodization and photoreduction processes. Morphological and surface characterization of the TiO2/Pd heterojunction photocatalyst, as well as photoelectrochemical behaviors, were investigated by X-ray diffraction, UV/Vis diffuse reflectance and photocurrent response. It was found that the precipitated..... More

                        
521 Effect of Anodic Oxidation Process Parameters on TiO2 Nanotube Formation in Ti-6Al-4V Alloys
Ti-6Al-4V합금에서 양극산화 공정변수가 TiO2 나노튜브 형성에 미치는 영향
Seung-Yeon Yoo, Hyun Gyoon Park
유승연, 박현균
Korean J. Met. Mater. 2019;57(8):521-528.   Published online 2019 Jul 11
DOI: https://doi.org/10.3365/KJMM.2019.57.8.521

Abstract
To investigate the effect of anodic oxidation process parameters on TiO2 nanotube formation in Ti-6Al-4V alloys, the composition of NH4F and H2O in the anodic oxidation processes were changed under the conditions of constant DC power ranging from 20 V to 60V and current density ranging from 10 mA to..... More

                        
529 Thermal Conductivity of Three-Dimensionally Interconnected Graphene-Networked Cu Composite Fabricated by a Simple Two-Step Process
Xue Li, Terry Arthur Ring, Byung-Sang Choi
Korean J. Met. Mater. 2019;57(8):529-534.   Published online 2019 Jul 11
DOI: https://doi.org/10.3365/KJMM.2019.57.8.529

Abstract
A Cu composite reinforced by a three-dimensionally interconnected graphene network was synthesized in situ by a simple two-step process utilizing compacted Cu powder (99% purity) as a template for the growth of graphene. Cu composites with different graphene contents were obtained by controlling the processing parameters. The composites were approximated..... More

                        
535 Computational Design of Highly Efficient and Robust Hole Transport Layers in Perovskite Solar Cells
페로브스카이트 태양전지의 최적 정공수송층 물질 및 구조 탐색 시뮬레이션
Jiyoung Jeong, Dongjun Song, Jihye Choe, Choong-Heui Chung, Ki-Ha Hong
정지영, 송동준, 최지혜, 정중희, 홍기하
Korean J. Met. Mater. 2019;57(8):535-542.   Published online 2019 Jul 4
DOI: https://doi.org/10.3365/KJMM.2019.57.8.535

Abstract
We investigated the effects of materials and the film thickness of hole transport layers (HTLs) on inverted type perovskite solar cells using optics-charge transport coupled simulations. Power conversion efficiencies (PCEs), and the variations in efficiency induced by the film thickness dispersion, were intensively studied, to compare potential HTLs candidates like..... More

                        
543 Effect of In-Situ Post Heating on Repairing STS316L Built by Laser Powder Bed Fusion Using Direct Energy Deposition
레이저로 적층 제조된 STS316L에 대한 직접에너지적층 응용 보수 시 공정 중 후열처리(In-Situ Post Heating) 효과
Wook Jin Oh, Yong Son, Do Sik Shim
오욱진, 손용, 심도식
Korean J. Met. Mater. 2019;57(8):543-553.   Published online 2019 Jul 11
DOI: https://doi.org/10.3365/KJMM.2019.57.8.543

Abstract
The repairing parts were fabricated by PBF (powder bed fusion) using direct energy deposition (DED), interfacial cracks can occur at the interface between the substrate and the area to be repaired. Such interfacial defects are due to the thermal stress induced by the temperature gradient which results from repeated melting..... More

                        
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