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Piezoresistive Characteristics of Carbon Nanotube Polymer Composites with Different Filler Content and Aspect Ratio for Pressure Sensors
압력 센서용 탄소 나노 튜브 폴리머 복합체의 필러 함량과 종횡비에 따른 압저항 특성
Jongchan Yoo, Dong-Young Kim, Dong-Kwan Lee, Kunwoo Nam, Sung-Hoon Park
유종찬, 김동영, 이동관, 남건우, 박성훈
Korean J. Met. Mater. 2023;61(10):793-799.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.793

Polymer composites enriched with conductive fillers hold immense potential for flexible pressure sensors, because of the remarkable piezoresistive effect they possess. Research on polymer composite pressure sensors has been actively ongoing because of their flexibility and high electrical resistance performance. This paper presents a comprehensive comparison of the piezoresistive characteristics..... More

Effects of Process Parameters on the Dimensions and Mechanical Properties of L-DED AISI 316L Stainless Steel
L-DED 공정으로 제조된 AISI 316L 스테인리스 스틸의 적층 형상 및 특성에 미치는 공정 변수의 영향
Jiyoung Park, Hyunji Nam, Qing-Ye Jin, Wookjin Lee
박지영, 남현지, Qing-Ye Jin, 이욱진
Korean J. Met. Mater. 2023;61(10):760-771.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.760

In this study, AISI 316L stainless steels were manufactured by the L-DED process with various laser scanning speeds and laser powers, in order to analyze how volumetric energy density (VED) can affect their final shape, microstructure and mechanical properties. Under various VED conditions, it was found that a higher VED..... More

Effect of Strain Rate on Deformation Behaviors of Ti-12.1Mo -1Fe Metastable Beta Alloy
Ti-12.1Mo-1Fe 준안정 베타 합금의 변형 거동에 대한 변형률 속도의 영향
In Kyeong Jin, Dong-Geun Lee
진인경, 이동근
Korean J. Met. Mater. 2023;61(10):741-747.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.741

The addition of expensive elements to β titanium alloys, which are widely used in the aerospace and automobile industries, causes their price to increase. Low-cost, high-strength alloy (Ti-12.1Mo-1.0Fe) was designed in this study and the compressive behaviors of this alloy were evaluated for application to automobile parts, etc. As a..... More

Effects of Intercritical Heat Treatment on the Temper Embrittlement of SA508 Gr.4N Ni-Cr-Mo High Strength Low Alloy Steels for Reactor Pressure Vessels
SA508 Gr.4N Ni-Cr-Mo계 고강도 원자로압력용기용 저합금강의 템퍼취화 거동에 미치는 이상영역 열처리의 영향
Seokmin Hong, Cho-Long Lee, Bong-Sang Lee, Hong-Deok Kim, Min-Chul Kim
홍석민, 이초롱, 이봉상, 김홍덕, 김민철
Korean J. Met. Mater. 2023;61(10):729-740.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.729

To analyze the effects of intercritical heat treatment on the temper embrittlement of SA508 Gr.4N steels, two model alloys with different phosphorus (P) contents were fabricated. Each sample was heat treated by applying a conventional heat treatment process (quenching-tempering) with/without an intercritical heat treatment process (IHT) and a step-cooling heat..... More

Effect of Oxygen Content on Microstructure and Mechanical Properties of Additive Manufactured Ti-6Al-4V
산소함량에 따른 Ti-6Al-4V 적층제조 조형체의 미세조직 및 기계적 특성 변화
Tae Jin Kang, P. L Narayana, Seong Woo Choi, Jae Hyuk Kim, Jae-Keun Hong, Taekyung Lee
강태진, P.L. Narayana, 최성우, 김재혁, 홍재근, 이태경
Korean J. Met. Mater. 2023;61(9):714-720.   Published online 2023 Aug 30
DOI: https://doi.org/10.3365/KJMM.2023.61.9.714

Titanium alloys are used in many fields including military, aerospace, and biomedical because of their excellent specific strength, corrosion resistance, and biocompatibility. Recently, much research has been focused on addressing the disadvantages of conventional manufacturing methods, including reducing material and energy waste when manufacturing titanium alloy parts by additive manufacturing..... More

Properties and Lightfastness of Natural and Artificial Azurite Used As Painting Pigment
채색안료로 사용되는 천연 및 합성 Azurite의 특성 및 안정성 연구
Ju-Hyun Park, Myoung-Nam Kim, Se-Rin Park, Sun-Myung Lee
박주현, 김명남, 박세린, 이선명
Korean J. Met. Mater. 2023;61(9):704-713.   Published online 2023 Aug 30
DOI: https://doi.org/10.3365/KJMM.2023.61.9.704

Azurite is an inorganic pigment commonly used in traditional painting arts and even today. This pigment has two types: natural azurite and synthetic artificial azurite, called blue verditer or blue bice. Because they have the same structure and similar appearance they are difficult to distinguish. The purpose of this study..... More

Lattice Thermal Conductivities of Yb(Cd<sub>1-<i>x</i></sub>Mg<sub><i>x</i></sub>)<sub>2</sub>Sb<sub>2</sub> Analyzed via Debye-Callaway Model
Debye-Callaway 모델 기반 Yb(Cd1-xMgx)2Sb2 열전 합금의 격자 열전도도 분석
Minsu Heo, Seung-Hwan Kwon, Won-Seon Seo, Sang-il Kim, Hyun-Sik Kim
허민수, 권승환, 서원선, 김상일, 김현식
Korean J. Met. Mater. 2023;61(8):608-615.   Published online 2023 Jul 24
DOI: https://doi.org/10.3365/KJMM.2023.61.8.608

YbCd2Sb2-based Zintl phases have been identified as promising materials for thermoelectric applications due to their high Seebeck coefficient and electrical conductivity. However, their high thermal conductivity limits their overall thermoelectric performance. To address this, Mg has recently been introduced as an alloying element at Cd atomic sites to reduce the..... More

Transition Metal Dichalcogenide WS<sub>2</sub> Films Prepared with a Combination of Spin/Dip Coating and CVD
Woon-Seop Choi
Korean J. Met. Mater. 2023;61(8):602-607.   Published online 2023 Jul 24
DOI: https://doi.org/10.3365/KJMM.2023.61.8.602

Recently, transition metal dichalcogenides (TMDCs) with 2D structure have attracted interest due to their many unique optical and electrical properties. The primary preparation methods for 2D materials are chemical vapor deposition (CVD), exfoliation, and other vacuum technologies. Large-scale synthesis of WS2 via solution-process is rare due to the higher temperature..... More

Stretchable Energy Harvesting Device based on Thermoelectric Composite Films
열전 복합체 필름을 이용한 스트레쳐블 에너지 하베스팅 소자 개발
Cheol Min Kim, Kwi-Il Park
김철민, 박귀일
Korean J. Met. Mater. 2023;61(8):594-601.   Published online 2023 Jul 20
DOI: https://doi.org/10.3365/KJMM.2023.61.8.594

Thermoelectric energy harvesting has attracted a lot of attention for powering self-powered devices because of the potential to generate energy anywhere with a temperature difference. In particular, a stretchable thermoelectric generator (S-TEG) can be applied to the repetitively moving parts of a machine and even a human body. Herein, we..... More

Improving the Electrical Properties of Zinc-Tin Oxide Thin-Film Transistors by Additive using Electrohydrodynamic Jet Technology
전기수력학 젯 기술을 이용한 아연-주석 산화물 박막트랜지스터에서 첨가제에 의한 전기적 특성 향상
Woon-Seop Choi, Young Jik Lee, Yong Jae Kim
최운섭, 이영직, 김용재
Korean J. Met. Mater. 2023;61(8):589-593.   Published online 2023 Jul 24
DOI: https://doi.org/10.3365/KJMM.2023.61.8.589

Oxide thin-film transistors (TFTs) are important semiconductor materials for display backplanes. To fabricate flexible displays, not only display modes but also TFTs are important. Flexible TFTs are especially needed for flexible displays, and related processes need to be developed. Printing is a good choice for the new fabrication of oxide..... More

Utilizing Dip-Coating to Fabricate Gate Dielectric and Semiconductor for Thin-Film Transistors
딥코팅 방법을 활용한 게이트 산화물 유전체 및 반도체 박막의 제조 및 박막트랜지스터 응용
Yongwan Kim, Young-Geun Ha
김용완, 하영근
Korean J. Met. Mater. 2023;61(8):581-588.   Published online 2023 Jul 20
DOI: https://doi.org/10.3365/KJMM.2023.61.8.581

The potential applications of advanced electronic materials in large-area, printable, and flexible electronics have generated significant interest. However, creating high-performance, low-voltage thin-film transistors (TFTs) for these applications remains difficult due to a lack of advanced gate dielectric and semiconductor materials that meet both ease-of-fabrication requirements and high electrical performance. In..... More

Lab-scale Process Parameter Determination of a Two-stage DRI (direct reduced iron) Process Using Reformed COG (coke oven gas)
개질된 COG (coke oven gas)를 이용한 2단 DRI (direct reduced iron) 공정의 공정변수 결정
Min Jeong Ko, Su Young Kim, Jong-Oh Jo, Jae-Rang Lee, Yong Ha Kim, Yong Sun Won
고민정, 김수영, 조종오, 이재랑, 김용하, 원용선
Korean J. Met. Mater. 2023;61(8):573-580.   Published online 2023 Jul 24
DOI: https://doi.org/10.3365/KJMM.2023.61.8.573

On the road to carbon neutrality, a great deal of attention is being paid to emerging technologies such as the DRI (direct reduced iron) process. This study proposes a two-stage DRI process using reformed COG (coke oven gas), and determined optimal process parameters. The reduction and carbonization of Carajás iron..... More

Localized Corrosion Behavior of UNS N07718 in a Solution Simulating a Diluted-sour Environment
UNS N07718의 묽은 사워(sour) 모사 용액 내 국부 부식 거동
Ye-Jin Lee, Jun-Seob Lee, Soon il Kwon, Jungho Shin, Young Tae Cho, Seok Kim, Je-Hyun Lee
이예진, 이준섭, 권순일, 신정호, 조영태, 김석, 이재현
Korean J. Met. Mater. 2023;61(8):553-560.   Published online 2023 Jul 24
DOI: https://doi.org/10.3365/KJMM.2023.61.8.553

The localized corrosion behavior of precipitation-hardened UNS N07718 was investigated by immersion tests in 6 wt% FeCl3 + 1.0 wt% HCl and the use of electrochemical techniques in a simulating solution of a diluted-sour environment of 25 wt% NaCl + 0.5 wt% CH3COOH. The Ti carbides and Nb-Mo carbides with..... More

Residual Stress Analysis of Additive Manufactured A356.2 Aluminum Alloys using X-Ray Diffraction Methods
X-선 회절을 통한 적층제조 A356.2 알루미늄 합금의 잔류응력 분석
SangCheol Park, InYeong Kim, Young Il Kim, Dae-Kyeom Kim, Soong Ju Oh, Kee-Ahn Lee, Bin Lee
박상철, 김인영, 김영일, 김대겸, 오승주, 이기안, 이빈
Korean J. Met. Mater. 2023;61(7):534-544.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.534

The physical properties of metal-based structural materials, such as hardness, strength and toughness, are directly or indirectly affected by residual stress inside or on the surface of the given part. Repeated rapid heating and cooling during the additive manufacturing process causes thermal gradients and expansion and contraction in the material,..... More

Effect of Supersonic Oxygen Lance on Post-Combustion in Converter Steelmaking Process Experiment and Analysis with Converter Simulator
전로 제강 공정에서 초음속 산소 랜스가 2차 연소에 미치는 영향 - 전로 모사 가스 반응로 실험 및 해석
Ji-A Lee, Chang-Su Ha, Jeong-Whan Han
이지아, 하창수, 한정환
Korean J. Met. Mater. 2023;61(7):514-523.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.514

Employing post-combustion technology in the converter, using the sensible heat of the hot metal and the oxidation reaction heat as a heat source, is known to compensate for insufficient heat in the converter process. However, most studies on post-combustion have been conducted using subsonic nozzles, whereas actual converter processes use..... More

Effect of Oxygen Concentration on the Growth and Cathodoluminescence Properties of MgO Nanowires
MgO 나노선의 성장과 음극선 발광 특성에 미치는 산소 농도의 영향
Geun-Hyoung Lee
Korean J. Met. Mater. 2023;61(7):509-513.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.509

MgO nanowires were grown by a thermal evaporation method at different N2/O2 gas ratios in order to investigate the effect of oxygen concentration on the growth and luminescence properties of the MgO nanowires. A thermal evaporation process was conducted at 1000oC and under a pressure of 500Torr. No nanowires were..... More

Highly Stretchable Strain Sensor with a High and Broad Sensitivity Composed of Carbon Nanotube and Ecoflex Composite
카본나노튜브/Ecoflex 복합체로 제작된 고신축성 및 고감도 신축성 스트레인 센서
Yuhwan Hwangbo, Hyun Jin Nam, Sung-Hoon Choa
황보유환, 남현진, 좌성훈
Korean J. Met. Mater. 2023;61(7):500-508.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.500

Wearable strain sensors with high and broad sensitivity, high stretchability and excellent mechanical endurance will be widely useful in smart wearable electronics. In this work, we developed a stretchable strain sensor fabricated with a simple stencil printing technique. The stretchable strain sensor was fabricated using a multi-walled carbon nanotubes (MWCNTs)-Ecoflex..... More

                           Cited By 1
Flexible Transparent Planar Heater Comprising ZnO/Cu/Al<sub>2</sub>O<sub>3</sub>
ZnO/Cu/Al2O3 구조의 유연 투명 면상발열체 연구
Heechang Kim, Dooho Choi
김희창, 최두호
Korean J. Met. Mater. 2023;61(7):480-488.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.480

In this study, we fabricated transparent heaters composed of an ultrathin Cu-layer heating element sandwiched between a ZnO underlayer and an Al2O3 overlayer. With the Cu layer thickness fixed at 8.5 nm, the thicknesses of the ZnO and Al2O3 layers were independently varied to reach the optimum antireflecting condition (maximum..... More

Effect of Mg Content and Cooling Rate After Solidification on the Mechanical Properties of T5-treated Al-Si-Mg Alloy
Al-Si-Mg합금에서 Mg함량과 주조응고 후 냉각속도가 T5 처리시 기계적 특성에 미치는 영향
Hyeon-Woo Son, Tae-Min Koo, Young-Hee Cho, Jung-Moo Lee
손현우, 구태민, 조영희, 이정무
Korean J. Met. Mater. 2023;61(7):472-479.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.472

The effects of Mg content and cooling rate on the T5 treatment of Al-Si-Mg alloys have been investigated using Avrami kinetics and transmission electron microscopy. The alloys were super-heated at 800 oC for 1 hr followed by degassing treatment at 720 oC for 15 min, and poured into a metallic..... More

Spheroidization Heat Treatment Conditions with Data Analysis in Medium Carbon Cr-Mo Steel for Ultra High Strength Cold Heading
Yong Deok Jo, Hui Ju Lee, Sung Yi, Byoung Lok Jang
Korean J. Met. Mater. 2023;61(7):459-471.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.459

The degree to which parameters affect the spheroidization heat treatment of steel was calculated by setting the spheroidization heat treatment conditions of Cr-Mo steel and using data analysis such as S/N ratio and ANOVA. After analyzing the transformation temperatures of the steel, Ac1 and Ac3 , using a DSC, the..... More

Branched MgO Nanowires Synthesized by Thermal Evaporation Method in Air at Atmospheric Pressure
대기압의 공기 분위기에서 열증발법에 의해 합성된 가지상 구조의 MgO 나노선
Geun-Hyoung Lee
Korean J. Met. Mater. 2023;61(6):444-448.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.444

MgO nanowires with a branched structure were fabricated using a thermal evaporation method in air at atmospheric pressure. The branched MgO nanowire was made up of two parts: a primary central nanowire trunk and lots of secondary nanowire branches. The branched MgO nanowires had a 4-fold symmetrical structure. The secondary..... More

Machine Learning-Based Prediction of Grain Size from Colored Microstructure
기계학습을 이용한 색상형 미세조직의 결정립 크기 측정
Jun-Ho Jung, Hee-Soo Kim
정준호, 김희수
Korean J. Met. Mater. 2023;61(5):379-387.   Published online 2023 Apr 20
DOI: https://doi.org/10.3365/KJMM.2023.61.5.379

We constructed a convolutional neural network to estimate average grain size from microstructure images. In the previous study from our research group, the network was trained using GB-type images in which the grain matrix and grain boundary were represented in white and black, respectively. The model well estimated the same..... More

Effect of Potassium Carbonate Additives on the Properties of Copper Foils Electroplated at High Current Density
고전류밀도에서의 탄산칼륨 첨가제의 전해동박 특성에 미치는 영향
Tae-Gyu Woo, Il-Song Park
우태규, 박일송
Korean J. Met. Mater. 2023;61(5):347-354.   Published online 2023 Apr 20
DOI: https://doi.org/10.3365/KJMM.2023.61.5.347

The amount and kind of additives in electrolytes play a very important role on the electroplating of Cu foil, which is used as a cathode materials for secondary batteries. As the use of Cu foil increased, various studies on the electroplated Cu foil are urgently needed. We studied surface characteristics..... More

High Temperature Deformation and Microstructural Evolution of Homogenized AA 2026 Alloy
균질화 AA 2026 합금의 고온 변형과 미세 구조 변화
HyeonWoo Kang, SooBin Kim, ByoungLok Jang, HeeKook Kim
강현우, 김수빈, 장병록, 김희국
Korean J. Met. Mater. 2023;61(5):338-346.   Published online 2023 Apr 20
DOI: https://doi.org/10.3365/KJMM.2023.61.5.338

AA 2026 is an improved version of AA 2024, an alloy with added Zr to reduce Fe and Si content and inhibit recrystallization during hot working. Al 2026 alloy has high strength and high damage resistance, so it is widely used in aircraft parts. In this study, in order to..... More

Effect of Sulfur Contents in NiZnS Composite Photocatalysts on Solar Water Splitting
황 함량 변화가 NiZnS 복합광촉매의 태양광 물분해 효율에 미치는 영향
Joo Hyun Kim, Eun seon Kang, Jung Hyeun Kim
김주현, 강은선, 김정현
Korean J. Met. Mater. 2023;61(4):284-290.   Published online 2023 Mar 22
DOI: https://doi.org/10.3365/KJMM.2023.61.4.284

Solar energy is attracting much attention as an eco-friendly source for future energy needs. Herein, NiZnS photocatalysts were synthesized with a hydrothermal method at various sulfur contents. The ZnS material is widely used as a photocatalyst because of its high stability, low toxicity, and excellent charge separation characteristics. Nickel is..... More

Study on Solidification and Phase Transformation Behaviors in Ni-based Superalloy IN625
IN 625 초내열합금의 응고거동 및 상변태 온도 분석
Seonghyo Ham, Junho Park, Changyong Jo, Seungcheol Yang, Yunkon Joo, Jiho Gu, Jehyun Lee
함성효, 박준호, 조창용, 양승철, 주윤곤, 구지호, 이재현
Korean J. Met. Mater. 2023;61(4):261-268.   Published online 2023 Mar 22
DOI: https://doi.org/10.3365/KJMM.2023.61.4.261

The solidification and phase transformation behaviors of IN625 with low C and Fe were investigated through directional solidification and quenching experiments. The primary and secondary dendrite arm spacing decreased exponentially as the solidification rate increased, demonstrating good agreement with theoretical equations. The MC carbide formed at a constant temperature gradient..... More

Review of Electro-catalysts Supported by Metal Oxides for Electrochemical Oxygen Reduction Reaction
금속 산화물 지지체를 이용한 산소환원반응에 대한 전기화학 촉매 연구 동향
Yoo-Jin Jo, Won Suk Jung, Boyoung Lim
조유진, 정원석, 임보영
Korean J. Met. Mater. 2023;61(4):231-241.   Published online 2023 Mar 22
DOI: https://doi.org/10.3365/KJMM.2023.61.4.231

Global warming and air pollution have forced greater attention to new energy sources to replace fossil fuels. Among several eco-friendly energy sources, polymer electrolyte membrane fuel cells have been increasingly investigated since they have zero emissions, high energy density, and high energy efficiency. Carbon-supported Pt catalyst is generally used for..... More

The Mechanism behind the High Thermoelectric Performance in YbCd<sub>2-x</sub>Mg<sub>x</sub>Sb<sub>2</sub>
YbCd2-xMgxSb2 열전 합금의 열전 성능 증대 메커니즘 분석
Seung-Hwan Kwon, Sang-il Kim, Minsu Heo, Won-Seon Seo, Jong Wook Roh, Heesun Yang, Hyun-Sik Kim
권승환, 김상일, 허민수, 서원선, 노종욱, 양희선, 김현식
Korean J. Met. Mater. 2023;61(3):198-205.   Published online 2023 Feb 24
DOI: https://doi.org/10.3365/KJMM.2023.61.3.198

YbCd2Sb2 is a promising Zintl compound for waste heat recovery applications due to its low thermal conductivity, originating from its complex crystal structure. Many strategies such as alloying or doping have been suggested to further reduce the thermal conductivity of YbCd2Sb2 to improve its thermoelectric performance. However, the..... More

Fabrication of Ruthenium-Based Transition Metal Nanoparticles/Reduced Graphene Oxide Hybrid Electrocatalysts for Alkaline Water Splitting
루테늄 기반 전이금속 나노입자/환원된 산화그래핀 혼성체를 이용한 알칼리 수전해 촉매 합성
Eun Been Lee, Seung Geun Jo, Sang Jun Kim, Gil-Ryeong Park, Jung Woo Lee
이은빈, 조승근, 김상준, 박길령, 이정우
Korean J. Met. Mater. 2023;61(3):190-197.   Published online 2023 Feb 24
DOI: https://doi.org/10.3365/KJMM.2023.61.3.190

Green hydrogen has attracted significant attention as one of the future energy sources because no greenhouse gases are emitted during production and its energy density is much higher than fossil fuels. Precious metals such as platinum (Pt) and iridium (Ir)-based catalysts are commonly used for water splitting catalysts. However, because..... More

Synthesis, Characterization, and Electromagnetic Wave Absorbing Properties of La<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub>
La0.7Sr0.3MnO3의 합성, 특성 평가 및 전자기파 흡수 특성
Jae Hee Heo, Young-Min Kang
허재희, 강영민
Korean J. Met. Mater. 2023;61(3):183-189.   Published online 2023 Feb 24
DOI: https://doi.org/10.3365/KJMM.2023.61.3.183

Perovskite manganese La0.7Sr0.3MnO3 (LSMO) powders were prepared by sol-gel synthesis and calcination in the temperature (T ) range of 500~1200 o C and their structures and electromagnetic (EM) wave absorption properties were investigated. X-ray diffraction (XRD) analysis revealed that the crystalline perovskite phase can be formed at T ≥ 600 oC...... More

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