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Volume 59(12); Dec 2021
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Review Papers
849 A Brief Review on the Ferroelectric Fluorite-Structured Nanolaminate
강유전성 플루오라이트 구조 기반 나노라미네이트 리뷰
Kun Yang, Ju Yong Park, Dong Hyun Lee, Se Hyun Kim, Geun Taek Yu, Geun Hyeong Park, Eun Been Lee, Je In Lee, Min Hyuk Park
양건, 박주용, 이동현, 김세현, 유근택, 박근형, 이은빈, 이제인, 박민혁
Korean J. Met. Mater. 2021;59(12):849-856.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.849

Ferroelectricity can be induced in fluorite-structured oxides such as HfO2 and ZrO2, a feature of increasing interest in both academia and industry. Initially, most research focused on solid solution films, but recently, it has been suggested that nanolaminates with independent HfO2 and ZrO2 layers may show electrical and physical properties..... More

Research Papers
857 Development of Light-Weight TRIP/TWIP FCC High Entropy Alloy with High Specific Strength and Large Ductility
고비강도와 고연신을 가지는 다중변형기구 하이엔트로피 합금 개발
Kook Noh Yoon, Hyun Seok Oh, Je In Lee, Eun Soo Park
윤국노, 오현석, 이제인, 박은수
Korean J. Met. Mater. 2021;59(12):857-869.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.857

In this study we developed a novel (TRIP+TWIP) high entropy alloy (HEA) with high specific strength and large ductility. First, by controlling the atomic constitution of the 3d transition metals (Cr, Mn, Fe, Co, and Ni), we designed a light-weight TRIP-assisted dual-phase HEA with a non-equiatomic composition of Cr22Mn6Fe40Co26Ni6, which..... More

870 Microstructure and Wear Properties of Al 7075 Alloy Manufactured by Twin-Roll Strip Casting Process
Twin-Roll Strip Casting 공정으로 제조된 Al 7075 합금의 미세조직 및 마모 특성
Kyoung-Wook Kim, Min-Seok Baek, Kwangjun Euh, Kee-Ahn Lee
김경욱, 백민석, 어광준, 이기안
Korean J. Met. Mater. 2021;59(12):870-879.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.870

Al 7075 alloy was manufactured using the twin-roll strip casting (TRC) process, and the mechanical and wear properties of the fabricated TRC process were investigated. To compare the properties of the alloy manufactured by TRC, another Al 7075 alloy was fabricated by conventional direct chill (DC) casting as a comparative..... More

880 Formation of Surface-Wrinkled Metal Nanosheets via Thermally Assisted Nanotransfer Printing
열보조 나노 전사 프린팅을 통한 금속 박막의 표면 주름 나노패턴 형성 방법
Tae Wan Park, Woon Ik Park
박태완, 박운익
Korean J. Met. Mater. 2021;59(12):880-885.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.880

Nanopatterning methods for pattern formation of high-resolution nanostructures are essential for the fabrication of various electronic devices, including wearable displays, high-performance semiconductor devices, and smart biosensor systems. Among advanced nanopatterning methods, nanotransfer printing (nTP) has attracted considerable attention due to its process simplicity, low cost, and great pattern resolution. However,..... More

886 Effects of Rotation Speed on Microstructure and Mechanical Properties in Ti/Cu Dissimilar Friction Stir Welding
Ti/Cu 이종 마찰 교반 용접 시 미세조직과 기계적 특성에 미치는 회전속도의 영향
Yong-Jae Lee, Won-Ki Jung, Se-Eun Shin, Dong-Geun Lee
이용재, 정원기, 신세은, 이동근
Korean J. Met. Mater. 2021;59(12):886-892.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.886

The dissimilar welding of titanium and copper by fusion welding is very difficult because the melting points of the materials are very highly different and strong brittle intermetallic compounds (IMCs) can be easily produced in welded zone and heat-affected zone, etc. Friction stir welding was employed as a type of..... More

893 The Effect of Preheating Current on the Melting Behavior of Bolt Projection Welding of Al-Si Coated Hot-Stamped Boron Steel
Al-Si 도금된 핫스탬핑 보론강의 볼트 프로젝션 용접시 예열 통전이 용융 거동에 미치는 영향
Jae-Hun Kim, Hyun-Uk Jun, Joo-Yong Cheon, Jae-won Kim, Jae-deuk Kim, Changwook Ji
김재훈, 전현욱, 천주용, 김재원, 김재득, 지창욱
Korean J. Met. Mater. 2021;59(12):893-903.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.893

This study evaluated the effect of preheating on early stage melting behavior of a Al-Si coated hot stamped boron steel bolt during projection welding. A large amount of heat was generated in the early stage of projection welding. Because of the large heat generation, a rapid collapse of the projection..... More

904 Synthesis of Nb0.8Hf0.2FeSb0.98Sn0.02 and Hf0.25Zr0.25Ti0.5NiSn0.98Sb0.02 Half-Heusler Materials and Fabrication of Thermoelectric Generators
Sung-Jae Joo, Ji-Hee Son, JeongIn Jang, Bong-Seo Kim, Bok-Ki Min
Korean J. Met. Mater. 2021;59(12):904-910.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.904

In this study, half-Heusler (HH) thermoelectric materials Nb0.8Hf0.2FeSb0.98Sn0.02 (p-type) and Hf0.25Zr0.25Ti0.5NiSn0.98Sb0.02 (n-type) were synthesized using induction melting and spark plasma sintering. For alloying, a conventional induction melting technique was employed rather than arc melting, for mass production compatibility, and the thermoelectric properties of the materials were analyzed. The maximum dimensionless..... More

911 Exploring Binder and Solvent for Depositing Activated Carbon Electrode on Indium–Tin-Oxide Substrate to Prepare Supercapacitors
슈퍼커패시터 전극 제조시 Indium-Tin-Oxide기판 위 활성탄 증착에 적합한 바인더와 용매 소재
Young Mook Choi, Sang-Eun Chun
최영묵, 전상은
Korean J. Met. Mater. 2021;59(12):911-920.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.911

Supercapacitor electrode slurry is prepared for mass production by mixing activated carbon powder, conductive agent, and binder, which is then deposited on a substrate using the doctor-blade method. Polyvinylidene fluoride (PVDF) and 1-methyl-2-pyrrolidone (NMP) are used as binder and solvent, respectively, to form the electrode slurry on a metal substrate...... More

921 Shielding Analysis of Metal Hydride-based Materials for Both Neutron and Gamma Rays Using Monte Carlo Simulation
Jeongkwon Kwak, Boravy Muth, Hyeon-Woo Yang, Chang Je Park, Woo Seung Kang, Sun-Jae Kim
Korean J. Met. Mater. 2021;59(12):921-925.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.921

Radiation causes damage to the human body, the environment, and electronic equipment. Shielding against neutron and gamma rays is particularly difficult because of their strong ability to penetrate materials. Conventional gamma ray shields are typically made of materials containing Pb. However, they pose problems in that Pb is a heavy..... More

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