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Research Papers
683 Development of 1.2 GPa Ferrite-based Lightweight Steels via Low-temperature Tempering
저온 템퍼링을 이용한 1.2 GPa급 페라이트계 경량철강 개발
Hyo Ju Bae, Kwang Kyu Ko, Hyoung Seok Park, Jae Seok Jeong, Jung Gi Kim, Hyokyung Sung, Jae Bok Seol
배효주, 고광규, 박형석, 정재석, 김정기, 성효경, 설재복
Korean J. Met. Mater. 2021;59(10):683-691.   Published online 2021 Sep 6
DOI: https://doi.org/10.3365/KJMM.2021.59.10.683

Previously reported low-Mn ferritic-based lightweight steels are potential candidates for industrial applications, however, they typically exhibit lower strength, with < 1 GPa and lower strength-ductility balance, than medium- and high-Mn austenitic lightweight steels. Herein, we introduce a low-temperature tempering-induced partitioning (LTP) treatment that avoids the strength-ductility dilemma of low-Mn ferriticbased..... More

692 Synthesis and Sintering of Nanostructured ZrB2-Al2O3 Composite
나노구조의 ZrB2-Al2O3 복합재료 합성과 소결
In-Jin Shon
Korean J. Met. Mater. 2021;59(10):692-697.   Published online 2021 Sep 6
DOI: https://doi.org/10.3365/KJMM.2021.59.10.692

ZrB2 is considered a candidate material for ultra-high temperature ceramics because of its high thermal conductivity, high melting point, and low coefficient of thermal expansion. Despite these attractive properties, ZrB2 applications are limited by its low fracture toughness below the brittle-ductile transition temperature. To improve its ductile properties, the approach..... More

698 Effect of ERNiFeCr-2 Filler Metal on Solidification Cracking Susceptibility of CM247LC Superalloy Welds
ERNiFeCr-2 용가재 적용에 따른 CM247LC 초내열합금 용접부 응고균열 민감도 변화 거동
Kyeong-Min Kim, Hye-Eun Jeong, Ye-Seon Jeong, Uijong Lee, Hyungsoo Lee, Seong-Moon Seo, Eun-Joon Chun
김경민, 정혜은, 정예선, 이의종, 이형수, 서성문, 천은준
Korean J. Met. Mater. 2021;59(10):698-708.   Published online 2021 Sep 6
DOI: https://doi.org/10.3365/KJMM.2021.59.10.698

The metallurgical aspects of weld solidification cracking in Ni-based superalloys (with Ti+Al > 5 mass%) have not been widely investigated thus far. Herein, the solidification cracking susceptibility of the CM247LC superalloy and its welds with ERNiFeCr-2 filler wire was quantitatively evaluated using a novel modified Varestraint testing method, for the..... More

709 Improvement in the Hydrogenation and Dehydrogenation Features of Mg by Milling in Hydrogen with Vanadium Chloride
수소 분위기에서 Mg와 VCl3의 밀링에 의한 Mg의 수소 흡수 방출 특성의 향상
Myoung Youp Song, Seong Ho Lee, Young Jun Kwak
송명엽, 이성호, 곽영준
Korean J. Met. Mater. 2021;59(10):709-717.   Published online 2021 Sep 6
DOI: https://doi.org/10.3365/KJMM.2021.59.10.709

VCl3 (vanadium (III) chloride) was selected as an additive to Mg to increase the hydrogenation and dehydrogenation rates and the hydrogen storage capacity of Mg. Instead of MgH2, Mg was used as a starting material since Mg is cheaper than MgH2. Samples with a composition of 95 wt% Mg +..... More

718 A Study on the ZnO Thin Film Deposited by RF Sputtering Method as an Electron Transport Layer in Quantum Dot Light-Emitting Diodes
RF sputtering으로 증착된 ZnO 박막을 전자 수송층으로 사용한 양자점 발광 다이오드에 관한 연구
Myoungsuk Kang, Jiwan Kim
강명석, 김지완
Korean J. Met. Mater. 2021;59(10):718-723.   Published online 2021 Sep 6
DOI: https://doi.org/10.3365/KJMM.2021.59.10.718

We report a highly efficient quantum dot light emitting diode (QLEDs) with a radio frequency (RF) sputtered ZnO thin film as an electron transport layer (ETL) instead of the conventional ZnO nanoparticles (NPs) by solution process. ZnO NPs have been used as a key material to improve the performance of..... More

724 Charge Transport and Thermoelectric Properties of Sn-Doped Tetrahedrites Cu12Sb4-ySnyS13
Hee-Jae Ahn, Il-Ho Kim
Korean J. Met. Mater. 2021;59(10):724-731.   Published online 2021 Sep 6
DOI: https://doi.org/10.3365/KJMM.2021.59.10.724

In this study, tetrahedrite compounds doped with Sn were prepared by mechanical alloying and hot pressing, and their charge transport and thermoelectric properties were analyzed. X-ray diffraction analysis revealed that both the synthetic powders and sintered bodies were synthesized as a single tetrahedrite phase without secondary phases. Densely sintered specimens..... More

732 Glycothermally Synthesized Self-aggregated ZnS Spherical Particles for Methyl Orange Photodecomposition
Sang-Jun Park, Jeong-Hwan Song
Korean J. Met. Mater. 2021;59(10):732-740.   Published online 2021 Sep 6
DOI: https://doi.org/10.3365/KJMM.2021.59.10.732

Using ethylene glycol (C2H6O2) as the solvent, ZnS particles were synthesized in high yield at a relatively low temperature of 125 oC via the glycothermal method. We report a facile method for preparing spherical self-aggregated ZnS particles from ZnS nanocrystals, using zinc acetate as the Zn2+ source and thiourea as..... More

Review Papers
741 Recent Studies on Bimetallic Pt–M Catalyst for the Oxygen Reduction Reaction in Polymer Electrolyte Membrane Fuel Cells
고분자 전해질 연료전지의 산소환원반응에 대한 Pt-M 합금 촉매의 최근 연구 동향
Yu-Jin Shim, Won Suk Jung
심유진, 정원석
Korean J. Met. Mater. 2021;59(10):741-752.   Published online 2021 Sep 6
DOI: https://doi.org/10.3365/KJMM.2021.59.10.741

Due to environmental pollution and global warming, research on new energy sources that can replace fossil fuels is important. A fuel cell is an eco-friendly energy conversion system that discharges water, and uses hydrogen as fuel. Although platinum is a widely used catalyst in PEMFCs, it has commercial limitations because..... More

Technical Notes
753 Oxidation Stabilization of ZrFe Alloys in Nitrogen Gas Atmosphere
질소 5N 가스 분위기에서 다공질 ZrFe 합금의 산화 안정화
Kwangbae Kim, Saera Jin, Yesol Lim, Hyunjun Lee, Seonghoon Kim, Yunyoung Noh, Ohsung Song
김광배, 진새라, 임예솔, 이현준, 김성훈, 노윤영, 송오성
Korean J. Met. Mater. 2021;59(10):753-759.   Published online 2021 Sep 6
DOI: https://doi.org/10.3365/KJMM.2021.59.10.753

A porous ZrFe alloy specimen was prepared as a 6 × 3 mm (diameter × thickness) disk. The reaction of the ZrFe alloy was confirmed while the whole system was maintained at a target temperature, which was increased from 150 oC to 950 oC in a 99.999% low purity nitrogen..... More

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