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Volume 62(6); Jun 2024
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Research Papers
411 Sintering Behavior and Thermal Properties of Cu-Graphite Materials by a Spark Plasma Sintering Method
방전플라즈마소결법을 이용한 구리-흑연 재료의 소결거동 및 열적 특성 평가
Min-hyeok Yang, Bum-soon Park, Hyoung-seok Moon, Jae-cheol Park, Hyun-kuk Park
양민혁, 박범순, 문형석, 박재철, 박현국
Korean J. Met. Mater. 2024;62(6):411-418.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.411

The use of heat dissipation materials in various field such as power semiconductor device, LED and microelectronic system. Therefore, there is a need for heat dissipation materials using copper (Cu) and graphite (Gr). These materials have high thermal conductivity. In particular, graphite has high thermal stability with a low coefficient..... More

419 Effect of Angle of Incident on Taper Angle in Femtosecond Laser Machining for Fabrication of Cross Section Analysis Specimen
단면 분석용 시편 제작을 위한 펨토초 레이저 가공에서 입사각이 테이퍼 각도에 미치는 영향
Jae Gyeong Kim, Chung-Soo Kim, Suk-Hee Park, Jeonghong Ha
김재경, 김충수, 박석희, 하정홍
Korean J. Met. Mater. 2024;62(6):419-428.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.419

Focused ion beam (FIB) technology is one of the most widely used methods for fabricating crosssectional analysis specimens because of its high precision and characteristics that minimize the occurrence of defects. Demand for large cross-sectional area analysis is increasing to improve product reliability in various industries, but is limited by..... More

429 The Effect of Rolling Reduction on the Microstructure Evolution and Slip Behavior of Ta-10W Alloy during Cold Rolling Process
냉간 압연 시 Ta-10W 합금의 미세조직 변화 및 슬립 거동에 미치는 압하율의 영향
Ki-Seong Park, Lalit Kaushik, Hyo-Sang Yoo, Jae-Yeol Jeon, Shi-Hoon Choi
박기성, Lalit Kaushik, 유효상, 전재열, 최시훈
Korean J. Met. Mater. 2024;62(6):429-444.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.429

In this study, we investigated the influence of cold rolling reduction on microstructural evolution and slip behavior in Ta-10W alloy fabricated by vacuum arc melting (VAM). As the reduction increased, both single and multiple slips were observed within some grain interiors. At reductions of 20% and 40%, deformation bands, primarily..... More

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445 Microstructure and Tensile Properties of Ni-Base Superalloy IN738LC according to Solidification Rate and Heat Treatment
Ni기 초내열합금 IN738LC의 응고속도와 열처리에 따른 미세조직 및 인장 특성
Byung-Hoon Kim, Byeong-Ook Kong, Yun-Kon Joo, Young-Kyu Ju, Hyun-Uk Hong, Je-Hyun Lee
김병훈, 공병욱, 주윤곤, 주영규, 홍현욱, 이재현
Korean J. Met. Mater. 2024;62(6):445-454.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.445

The strength of Ni-base superalloys mainly depends on the γ' precipitates that improve the strength of the materials at high temperatures. The presence of γ' particles within the matrix restricts dislocation movement, and optimized heat treatments can tailor the size, shape, and volume fraction of γ'. In this study the..... More

455 Polymer-Chain Aggregation-induced Electrical Gating at the H- and J-aggregate P3HT
Byoungnam Park
Korean J. Met. Mater. 2024;62(6):455-463.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.455

This research explores how aggregation influences the electrical behavior at both the planar - heterojunction poly(3-hexylthiophene) (P3HT)/SiO2 and P3HT/ZnO nanocrystal (NC) interfaces. The formation of H- and J-type aggregates leads to distinct molecular ordering and packing structures, manifesting as changes in threshold voltage shifts (electrical gating) as well as absorption..... More

464 Characterization of Transparent Electrodes with Ag Metal-mesh using MATLAB
MATLAB을 이용한 Ag Metal-mesh 기반의 투명 전극 특성 분석
Seung-Taek Jo, Jin Wook Shin, Walter Commerell, Dae-Hwang Yoo, Hyesun Yoo, Jinyoung Hwang, Hyun-Sik Kim, Sang-il Kim, Jong Wook Roh
조승택, 신진욱, Walter Commerell, 유대황, 류혜선, 황진영, 김현식, 김상일, 노종욱
Korean J. Met. Mater. 2024;62(6):464-471.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.464

It is well-known that optical transparence and electric resistance have a trade-off relationship in transparent electrodes. For this reason, developing methods to predict this relation have been important in various fields of academic research as well as for industrial applications. Herein, we suggest a simple method which reveals the relationship..... More

472 Development of Ternary Layered Double Hydroxide Oxygen Evolution Reaction Electrocatalyst for Anion Exchange Membrane Water Electrolysis
음이온교환막 수전해를 위한 3원계 층상 이중 수산화물 산소 발생 반응 촉매 개발
Shin-Woo Myeong, Song Jin, Chiho Kim, Jooyoung Lee, Yangdo Kim, Sung Mook Choi
명신우, 진송, 김치호, 이주영, 김양도, 최승목
Korean J. Met. Mater. 2024;62(6):472-479.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.472

To achieve net zero emissions, green hydrogen should be produced via water electrolysis with renewable energy. To develop efficient anion exchange membrane water electrolyzers (AEMWE), the development of efficient and stable non-precious metal electrocatalysts for the oxygen evolution reaction (OER) is essential. In this study, a high-performance ternary NiFeCo-layer double..... More

480 Thermoelectric Chalcostibite: Solid-State Synthesis and Thermal Properties
Dong Hwi Kim, Sang Yun, Il-Ho Kim
Korean J. Met. Mater. 2024;62(6):480-486.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.480

In this study, thermoelectric chalcostibite (CuSbS2) compounds were fabricated using mechanical alloying (MA) and hot pressing (HP), and phase identification, microstructural observation, and thermal analysis were conducted. The thermal properties were then measured and compared with those of other Cu–Sb–S ternary compounds synthesized by the same solid-state process, namely, skinnerite..... More

487 Estimation of Maximum zT in Cu3SbSe4 for Different Starting Materials Content
시작물질 농도 제어에 따른 Cu3SbSe4 열전소재의 최대 열전성능지수 예측
Minkyu Lee, Seong-Mee Hwang, Se Jun Kim, Won-Seon Seo, Sang-il Kim, Hyun-Sik Kim
이민규, 황성미, 김세준, 서원선, 김상일, 김현식
Korean J. Met. Mater. 2024;62(6):487-493.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.487

Cu3SbSe4 is considered a promising thermoelectric material because of its large effective mass and low thermal conductivity, originating from its unique lattice structure. However, Cu3SbSe4 has intrinsically low carrier concentration and relatively high electric resistance which limit performance. Recently, a zT improvement in Cu3SbSe4 was reported where doping/precipitation is controlled..... More

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