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Korean J. Met. Mater.
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Korean J. Met. Mater.
2025;63(1):43-52. Published online 2025 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.1.43
Abstract
Bismuth antimony telluride (Bi-Sb-Te)-based alloys remain the dominant choice for near-roomtemperature thermoelectric cooling applications. One of the most studied approaches to improve the thermoelectric performance of Bi-Sb-Te alloys has been a nanostructuring strategy, to suppress the lattice thermal conductivity. This study investigates the impact of incorporating reduced pyrolyzed Pd acetate.....
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Korean J. Met. Mater.
2025;63(1):33-42. Published online 2025 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.1.33
Abstract
The weldability and the relationship between microstructure and tensile properties at 298 and 110 K produced by laser-arc hybrid welding (LAHW) in high-Mn steel welds were thoroughly investigated. In the laser zone of LAHWs using filler wire, more Mn vaporization in the laser zone was observed than at the arc.....
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직교 가공 시험법을 이용한 내열 Ta-W 합금 절삭 가공 최적화 연구
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김규식, 김신원, 문창현, 박정효, 김동훈, 양성호, 박형욱
Korean J. Met. Mater.
2025;63(1):23-32. Published online 2025 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.1.23
Abstract
Tantalum and tantalum alloys, which have superior thermal properties, including a high melting temperature, low specific heat, low thermal conductivity, and high density, are promising candidates for highperformance parts exposed to high temperatures and hazardous environments in aerospace, defense, and other industries. However, those alloys are hard to cut and.....
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정재호, 조민철, 이근호, 박이주
Korean J. Met. Mater.
2025;63(1):11-22. Published online 2025 Jan 5
DOI:
https://doi.org/10.3365/KJMM.2025.63.1.11
Abstract
Laser Directed Energy Deposition (L-DED) is a notable additive manufacturing method in which metal powder is sprayed through a nozzle and then consolidated layer by layer using a laser. Unlike other additive manufacturing processes, DED has fewer constraints on the size of the fabricated parts, making it advantageous for the.....
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직접 에너지 적층법에 의해 용접된 Fe-Mn-Si계 형상기억합금의 미세조직, 회복응력 및 기계적 특성
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김태윤, 김도형, 이욱진, 김왕렬
Korean J. Met. Mater.
2024;62(12):935-943. Published online 2024 Nov 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.12.935
Abstract
Direct Energy Deposition (DED) is one of the main methods of additive manufacturing in which a feedstock material in the form of powder or wire is delivered to a substrate while an energy source, such as laser beam or electron beam, is simultaneously applied to melt the feedstock. In addition.....
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Korean J. Met. Mater.
2024;62(11):868-878. Published online 2024 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.11.868
Abstract
In this study, the electromagnetic (EM) wave absorption properties of a two-layered structure composed of La
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Ni-Cr-Mo 저합금강에 Ta 합금이 폭발압접된 클래드 계면의 미세조직 및 기계적 특성 고찰
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김시연, 김태경, 장성진, 김동훈, 양성호, 홍현욱
Korean J. Met. Mater.
2024;62(11):857-867. Published online 2024 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.11.857
Abstract
The effects of welding variables (stand-off distance and explosive thickness) on the interfacial microstructure evolution and mechanical properties of explosively welded Ta alloy to Ni-Cr-Mo low alloyed steel have been investigated. Regardless of welding conditions (a stand-off distance of 3-5 mm and explosive thickness of 40-80 mm), the Ta/steel interface.....
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Ni 825/A516-70N 클래드 판재의 용접 방법의 차이에 의한 기계적 특성 평가 및 예측
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황철홍, 오정석, 박지니, 조명우, 김선환, 유경훈, 김성웅, 김영주, 이상엽, 박준식
Korean J. Met. Mater.
2024;62(11):844-856. Published online 2024 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.11.844
Abstract
In this study, the microstructures and mechanical properties of different methods of FCAW (Flux-cored arc welding) + FCAW or FCAW + GTAW (Gas tungsten arc welding) welding on Ni825/A516-70N clad plate were investigated, using a double U groove angle on a laboratory scale. The amount of specimen deformation with FCAW.....
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Korean J. Met. Mater.
2024;62(11):837-843. Published online 2024 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.11.837
Abstract
Ti6Al4V is one of the most widely used Ti alloys in biomedical applications, such as orthopedic and dental implants, due to its excellent mechanical properties, biocompatibility, and high corrosion resistance. Metal implants require high bonding strength between the implant and bone for long-term use in the human body; Hydroxyapatite (HAp).....
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Ta-10W 합금의 고온 마모 특성
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강태훈, 박정효, 김규식, 이기안
Korean J. Met. Mater.
2024;62(10):827-835. Published online 2024 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.10.827
Abstract
This study investigated the high-temperature wear characteristics of Ta-10W alloy, composed of 90% tantalum and 10% tungsten, known for its high melting point, excellent corrosion resistance, and oxidation resistance. Wear tests were conducted using a ball-on-disc method with alumina balls at temperatures of 200°C, 400°C, 600°C, and 700°C. The results.....
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Korean J. Met. Mater.
2024;62(10):803-819. Published online 2024 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.10.803
Abstract
Residual antibiotics in natural aquatic environments pose a critical threat to humans and other organisms. However, most sewage treatment plants fail to remove them. Photocatalytic nanomaterials can efficiently destroy these persistent organic pollutants in wastewater. In this study, we developed a series of cobalt-doped SrTiO
3
(Co-STO) catalysts with different doping.....
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정밀한 Pb 도핑을 통한 Bi
0.5
Sb
1.5
Te
3
의 열전 성능 향상: Single Parabolic Band 모델을 이용한 분석
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강지원, 황성미, 김세윤, 이창우, 서원선, 김상일, 김현식
Korean J. Met. Mater.
2024;62(10):787-795. Published online 2024 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.10.787
Abstract
This study investigates the thermoelectric properties of Pb-doped p-type Bi
0.5
Sb
1.5
Te
3
alloys using the Single Parabolic Band (SPB) model, focusing on optimizing room-temperature performance. We systematically analyze the effects of Pb doping (0, 0.49, 0.65, 0.81, 0.97, and 1.3 at%) on key parameters including density-of-states effective mass (
m
d
*), non-degenerate mobility.....
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MLCC용 Ni 나노파우더의 소결 억제를 위한 W 나노파우더 첨가의 효과
J
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이준운, 민건식, 이성민, 안영규, 한흥남
Korean J. Met. Mater.
2024;62(10):777-786. Published online 2024 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.10.777
Abstract
Multilayer ceramic capacitors (MLCCs) are essential fundamental components in electronic devices, enabling miniaturization and high capacitance for energy storage and filtering. A key focus in MLCC research is enhancing capacitance density, for which improving the connectivity of Ni internal electrodes is imperative. The primary cause of reduced electrode connectivity in.....
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Korean J. Met. Mater.
2024;62(10):749-756. Published online 2024 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.10.749
Abstract
The drawing process severely deforms commercial AA1070 alloy for electrical wire, reducing a rod from a diameter of 2.0 mm to 0.4 mm, followed by annealing. The annealing process was conducted at various temperatures ranging from 200℃ to 450℃, with each temperature maintained for 1hour. The effects of increasing annealing.....
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물 분해 수소생산을 위한 전이금속(M) 바이메탈형 CoM-ZIF/CdS 광촉매 제조
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김주현, 이유림, 안채현, 이수민, 김정현
Korean J. Met. Mater.
2024;62(9):713-720. Published online 2024 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.9.713
Abstract
Recently, due to energy shortages and environmental pollution caused by the continued use of fossil fuels, there is a growing need for renewable sources to replace fossil fuels. ZIF-67 has a porous structure, a large surface area, high thermal and chemical stability, and a narrow band gap, so it is.....
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은합금 와이어의 팔라듐 함량에 따른 물성 변화와 고습신뢰성
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김상엽, 전성민, 박현준, 김승현, 신종진, 송오성
Korean J. Met. Mater.
2024;62(9):705-712. Published online 2024 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.9.705
Abstract
This study investigated changes in electrical and mechanical properties, as well as the high humidity reliability of 18 μm-diameter silver alloy wires with palladium contents of 1.1, 2.5, 3.0, and 4.0 wt%, for semiconductor packaging. We also compared the formation of Free Air Ball (FAB) and the high humidity reliability.....
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{10-12} 쌍정이 저온 시효 중 Mg-8Al-0.5Zn 합금 압출재의 석출거동에 미치는 영향
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김현지, 김예진, 박성혁
Korean J. Met. Mater.
2024;62(8):662-671. Published online 2024 Jul 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.8.662
Abstract
This study investigates the influence of {10–12} twins on the aging behavior of an extruded Mg–8Al–0.5Zn (AZ80) alloy during aging at 150 °C. The extruded AZ80 alloy is subjected to a compressive strain of 6% along the transverse direction and is subsequently aged at 150 °C. The sample with {10–12}.....
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알루미늄-아연-마그네슘 합금의 원자단위 투과전자현미경 관찰 기반 η
1
석출물 성장 고찰
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김황선, 한흥남
Korean J. Met. Mater.
2024;62(8):656-661. Published online 2024 Jul 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.8.656
Abstract
Aluminum-Zinc-Magnesium (Al-Zn-Mg) alloys are extensively utilized in aerospace and automotive industries because of their exceptional mechanical properties and light weight. These properties of Al-Zn-Mg alloys are significantly influenced by the morphology, distribution, and size of the precipitates within the alloy, which result from the formation of numerous nanoscale precipitates. Among.....
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M
2+, 3+
(M = Mn
3+
, Zn
2+
, Ni
2+
)이 치환된 Sr
3
Co
2
Fe
24
O
41
hexaferrite 복합체의 전자기파 흡수 특성
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허재희, 강영민
Korean J. Met. Mater.
2024;62(8):645-655. Published online 2024 Jul 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.8.645
Abstract
Mn, Zn, Ni-substituted Z-type hexaferrites, Sr
3
Co
2
Fe
24
O
41
(Sr
3
Co
2
Fe
24-x
Mn
x
O
41
, Sr
3
Co
2-y
Zn
y
Fe
24
O
41
, Sr
3
Co
1-z
Ni
z
ZnFe
24
O
41
), were prepared by sol-gel synthesis processes and their high-frequency magnetic, dielectric and electromagnetic (EM) wave absorption characteristics were investigated. Substituting Mn for Fe by
x
= 0.5 maintained the single-phase Z phase while shifting the μ' , μ″ spectra towards lower.....
More
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은 나노와이어 전도성 네트워크 형성을 통한 발열 폴리에스테르 섬유 제조 연구
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이현재, 최두호
Korean J. Met. Mater.
2024;62(8):639-644. Published online 2024 Jul 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.8.639
Abstract
In recent years, extensive research has been conducted on wearable smart garments incorporating various materials and technologies, among which heating garments with the ability to generate heat through battery-powered circuits have gained significant attention. However, traditional methods utilizing heating wires suffer from drawbacks such as increased weight, lack of flexibility.....
More
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Twin wire arc spray 공정을 통해 제작된 Fe계 비정질 합금 코팅의 염수 환경 노출에 대한 연구
H
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권한솔, 강용진, 유연우, 김도현, 박영진, 남욱희, 변응선
Korean J. Met. Mater.
2024;62(8):613-623. Published online 2024 Jul 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.8.613
Abstract
Fe-based amorphous alloys are promising structural materials that have a disordered lattice structure and metastable state. Due to their advanced properties, including high hardness, high elastic limit, improved wear and corrosion resistance, Fe-based amorphous alloys have a great potential for protective materials in harsh industrial fields. Twin wire arc spray.....
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SA508 Gr.1A 저합금강의 기계적특성에 미치는 이상영역열처리 및 Pre-tempering 열처리의 영향
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현세미, 홍석민, 김민철, 김종민, 손석수
Korean J. Met. Mater.
2024;62(8):593-601. Published online 2024 Jul 31
DOI:
https://doi.org/10.3365/KJMM.2024.62.8.593
Abstract
To apply the leak-before-break (LBB) concept to the main steam line piping of nuclear power plants, the use of SA508 Gr.1A low-alloy steel is being considered. To increase the LBB safety margin, it is essential to improve the strength and toughness of the material. In this study, intercritical heat treatment.....
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Cu 도핑 및 Electric Current Pulse 공정에 의한 Bi-Sb-Te계 열전소재의 최대 열전성능지수 예측
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이준하, 박현진, 김준수, 서원선, 김상일, 김현식
Korean J. Met. Mater.
2024;62(7):550-557. Published online 2024 Jun 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.7.550
Abstract
Bi
2
Te
3
shows high thermoelectric performance near room temperature, making it the most widely used material in thermoelectric cooling applications. Cu doping has been found to be effective in improving the thermoelectric performance of Bi
2
Te
3
. However, due to the problem of easy migration of Cu ions, the stability of Cu-doped Bi
2
Te
3
.....
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방전 플라즈마 소결과 압축 성형 방법으로 제조된 알루미늄 다공체의 구조적, 기계적 특성 연구
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최승혁, 이상화, 정재길, 이석재, 안태영, 최유송, 손승배
Korean J. Met. Mater.
2024;62(7):533-541. Published online 2024 Jun 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.7.533
Abstract
Metal foam materials are used for various purposes including electrode materials, catalyst filters, and gas diffusion filters due to their porous structure. Increasing demand for metal foams has generated research to increase porosity as well as produce different pore sizes. The present paper illustrates a comparison of open-cell aluminum foams...
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Crossref 1
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리튬이온 배터리용 Cu-Steel 이종 레이저 용접부 응고균열에 미치는 Ni-P 도금의 영향
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박재현, 김명진, 강희신, 천은준
Korean J. Met. Mater.
2024;62(7):503-510. Published online 2024 Jun 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.7.503
Abstract
This study investigated the effect of a Ni-P coating layer on the solidification cracking behavior of Cu–mild steel dissimilar welds during the manufacturing of cylindrical Li-ion battery packs for electric vehicles. Four Cu plates were prepared and characterized: uncoated Cu and three levels (12, 50, and 100 μm) of Ni–P-coated.....
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시작물질 농도 제어에 따른 Cu
3
SbSe
4
열전소재의 최대 열전성능지수 예측
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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
Abstract
Cu
3
SbSe
4
is considered a promising thermoelectric material because of its large effective mass and low thermal conductivity, originating from its unique lattice structure. However, Cu
3
SbSe
4
has intrinsically low carrier concentration and relatively high electric resistance which limit performance. Recently, a
zT
improvement in Cu
3
SbSe
4
was reported where doping/precipitation is controlled.....
More
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음이온교환막 수전해를 위한 3원계 층상 이중 수산화물 산소 발생 반응 촉매 개발
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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
Abstract
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.....
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MATLAB을 이용한 Ag Metal-mesh 기반의 투명 전극 특성 분석
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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
Abstract
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.....
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냉간 압연 시 Ta-10W 합금의 미세조직 변화 및 슬립 거동에 미치는 압하율의 영향
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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
Abstract
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.....
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Crossref 1
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단면 분석용 시편 제작을 위한 펨토초 레이저 가공에서 입사각이 테이퍼 각도에 미치는 영향
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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
Abstract
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.....
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