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Volume 59(8); Aug 2021
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Research Papers
515 Probability-Dependent Precipitation Strengthening Effect of Anisotropic Precipitate in Al-Mg-Si Alloy Produced by T6 Heat Treatment
T6 열처리에 의한 Al-Mg-Si 합금의 비등방성 석출물 형상을 고려한 확률 의존적 석출강화효과
Seunggyu Choi, Gwanghun Kim, Jin Pyeong Kim, Se Hoon Kim, Seung Bae Son, Seok-Jae Lee
최승규, 김광훈, 김진평, 김세훈, 손승배, 이석재
Korean J. Met. Mater. 2021;59(8):515-523.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.515

Abstract
This study proposed a constitutive equation to predict the change in yield strength according to the behavior of β″ metastable precipitates, which have a profound effect on strength among materials precipitated during the T6 heat treatment of Al-Mg-Si alloy. The β″ precipitate is a metastable phase before it becomes a..... More

      
524 Effect of Low Transformation Temperature Welding Consumable on Microstructure, Mechanical Properties and Residual Stress in Welded Joint of A516 Carbon Steel
Sungki Choi, Junsang Lee, Jae-Yik Lee, Seung-Kyun Kang, Young-Cheon Kim, Seung-Joon Lee, Dongil Kwon
Korean J. Met. Mater. 2021;59(8):524-532.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.524

Abstract
The microstructure, mechanical properties and residual stress of flux-cored arc welded ASTM A516-70N carbon steel using a Mn-based low-temperature transformation (LTT) welding consumable were investigated. Microstructural analysis with X-ray diffraction, an electron backscattered diffractometer and a field-emission scanning electron microscope showed that the LTT weld metal was made up of..... More

      
533 Effects of Adding CO2 to Low Level H2S Containing Aqueous Environments on the Corrosion and Hydrogen Penetration Behaviors of High-Strength Steel
미량의 H2S 함유 수용액 환경 내 CO2 첨가가 고강도 철강소재의 부식 및 수소침투거동에 미치는 효과
Seung Min Ryu, Jin-seong Park, Hye Rin Bang, Sung Jin Kim
류승민, 박진성, 방혜린, 김성진
Korean J. Met. Mater. 2021;59(8):533-544.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.533

Abstract
The effects of adding CO2 to low level H2S containing aqueous environment on the corrosion and hydrogen penetration behaviors of high-strength steel were evaluated using a range of experimental and analytical methods. The corrosion rate of the steel sample exposed to a low level of H2S dissolved in an aqueous..... More

      
545 Influence of Ag interlayer Thickness on the Optical, Electrical and Mechanical Properties of Ti-doped In2O3/Ag/Ti-doped In2O3 Multilayer Flexible Transparent Conductive Electrode
Ag 중간층 두께에 따른 Ti-doped In2O3/Ag/Ti-doped In2O3 다층 유연 투명전극의 전기적, 광학적, 기계적 특성 연구
Su-Hyeon Choe, Jin-Kyu Jang, Hyun-Jin Kim, Jae-Wook Choi, Sung-Bo Heo, Yu-Sung Kim, Young-Min Kong, Daeil Kim
최수현, 장진규, 김현진, 최재욱, 허성보, 김유성, 공영민, 김대일
Korean J. Met. Mater. 2021;59(8):545-550.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.545

Abstract
Transparent and conductive Ti-doped In2O3 (TIO)/Ag/Ti-doped In2O3 (TAT) multilayer films were deposited on colorless poly imide (CPI) substrates by direct current (DC) and radio frequency (RF) magnetron sputtering at room temperature. During deposition the thickness of both the top and bottom TIO layer was fixed at 30 nm, while the..... More

      
551 Development of a High-Performance-Ferrite Magnet Fabrication Process without Sintering Additives
소결 첨가제 없는 고특성 페라이트 영구자석 공정 개발
Pyeong-Yeol Yu, Min-Ho Kim, Young-Min Kang
유평열, 김민호, 강영민
Korean J. Met. Mater. 2021;59(8):551-559.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.551

Abstract
Sintered M-type hexaferrites with the chemical formula of Sr0.3Ca0.4La0.3Fe9.8Co0.2-xMnxSi0.135O19-d (x = 0, 0.05, 0.1, 0.2) and Sr0.3Ca0.4La0.3Fe9.8-yCo0.2MnySi0.135O19-d (y = 0.05, 0.1, 0.2) were prepared by conventional solid station reaction routes. A high sintering density of more than 95% of the theoretical density was achieved in all hexaferrite samples when calcination..... More

      
560 Electronic Transport and Thermoelectric Properties of Te-Doped Tetrahedrites Cu12Sb4-yTeyS13
Sung-Gyu Kwak, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2021;59(8):560-566.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.560

Abstract
Tetrahedrite is a promising thermoelectric material mainly due to its low thermal conductivity, a consequence of its complicated crystal structure. However, tetrahedrite has a high hole concentration; therefore, optimizing carrier concentration through doping is required to maximize the power factor. In this study, Te-doped tetrahedrites Cu12Sb4-yTeyS13 (0.1 ≤ y ≤..... More

      
567 A Study on the Effects of Surface Energy and Topography on the Adhesive Bonding of Aluminum Alloy
Gilho Kang, Wonjong Choi
Korean J. Met. Mater. 2021;59(8):567-574.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.567

Abstract
The bonding properties of adhesives are mainly affected by surface roughness, topography and chemical adsorption. In this paper, we studied the effects of surface pretreatment of Al 2024-T3 (bare) in terms of surface roughness, topography and surface free energy. Surface pre-treatment included solvent cleaning, FPL etching, PAA and CAA treatment...... More

      
575 Fabrication of Metal Nanowire Based Stretchable Mesh Electrode for Wearable Heater Application
착용형 히터 응용을 위한 금속 나노와이어 기반 신축성 메쉬 전극 제작
Nam-Su Jang, Kang-Hyun Kim, Jong-Man Kim
장남수, 김강현, 김종만
Korean J. Met. Mater. 2021;59(8):575-581.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.575

Abstract
In recent years, human-convenient smart wearable devices have attracted considerable attention as emerging applications in smart healthcare systems, soft robotics, and human-machine interfaces. In particular, resistive film heaters with mechanical flexibility and excellent mechanical and electrothermal performance have recently been widely explored for wearable thermotherapy applications. Here, we present a..... More

      
582 Influences of Heat Treatment on the Thermal Diffusivity and Corrosion Characterization of Al-Mg-Si alloy
Al-Mg-Si 합금에서 열처리가 열확산도와 부식특성에 미치는 영향
Yu-Mi Kim, Se-Weon Choi, Young-Chan Kim, Chang-Seog Kang
김유미, 최세원, 김영찬, 강창석
Korean J. Met. Mater. 2021;59(8):582-588.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.582

Abstract
The effect of the heat treatment on the Mg2Si phase in Al-Mg-Si alloy was investigated by a laser flash apparatus (LFA), Differential scanning calorimetry (DSC) and corrosion test. The alloy samples were solution treated at 590 oC for a half hour followed by warm water quenching, and then aged in..... More

      
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