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Korean J. Met. Mater.
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Korean J. Met. Mater.
2024;62(4):299-305. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.299
Abstract
To improve the hydrogen-storage properties of Mg
2
Ni, LiBH
4
was added by milling in hydrogen atmosphere (reactive mechanical milling, RMM). Mg
2
Ni-10LiBH
4
was prepared with a composition of 90 wt% Mg
2
Ni + 10 wt% LiBH
4
. The quantity of released hydrogen (H
r
) versus temperature T curve for Mg
2
Ni10LiBH
4
was obtained by heating at.....
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Twin wire arc spray 공정을 통해 제작된 Al-Al
2
O
3
복합소재 미끄럼 방지 코팅의 우수한 마모 저항성
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권한솔, 박영진, 강용진, 김도현, 남욱희, 변응선
Korean J. Met. Mater.
2024;62(4):257-266. Published online 2024 Mar 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.4.257
Abstract
In this study, novel non-skid Al-Al
2
O
3
coatings with improved wear resistance were fabricated using twin wire arc spray (TWAS). TWAS Al coating was prepared as a reference sample and representative TWAS parameters (working distance, process gas pressure, arc current) were controlled to fabricate different Al-Al
2
O
3
coatings. The Al-Al
2
O
3
coatings showed.....
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진공 브레이징을 통해 제조한 TiAl/HI-TEMP 820/SCM440H 재료의 공정 온도에 따른 미세조직 및 기계적 특성 평가
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유상규, 김지원, 이초롱, 오명훈, 최인철
Korean J. Met. Mater.
2024;62(3):229-238. Published online 2024 Feb 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.229
Abstract
The TiAl alloy is attracting attention as a lightweight and heat-resistant material, because of its high specific strength, excellent high-temperature formability, and fatigue strength. However, its applications are limited by its high unit price and low room temperature ductility. To overcome this issue, dissimilarly bonded materials have been extensively employed......
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Er 합금 원소 첨가를 통한 인장 물성과 절삭성이 우수한 Ti 합금 개발
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최이슬, 오정목, 박찬희, 이욱진, 박용호, 원종우
Korean J. Met. Mater.
2024;62(3):171-179. Published online 2024 Mar 5
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.171
Abstract
This study demonstrates that the addition of the rare earth element Erbium (Er) significantly enhances the machinability and tensile properties of titanium (Ti). Pure Ti alloys and Er-added Ti alloys with 0.5-1.1 wt.% Er content were prepared, and their microstructure, machinability, and tensile properties were compared. Two different types of.....
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고에너지 볼 밀링을 이용한 분산강화된 Fe-TaC 합금분말의 소결거동 및 기계적 특성평가
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박범순, 이정한, 박재철, 홍성길, 박현국
Korean J. Met. Mater.
2024;62(3):163-170. Published online 2024 Feb 28
DOI:
https://doi.org/10.3365/KJMM.2024.62.3.163
Abstract
In this study, a high-melting point element, tantalum carbide (TaC) was added to improve the mechanical properties and the oxidation/corrosion resistance of Fe. The Fe-TaC composites were synthesized by high energy ball milling for the mechanical alloying of the non-equilibrium phase (Fe-Ta) and the homogeneous dispersion of TaC. Fe-TaC composite.....
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Al-Mg-Si-Cu-Mn 합금 압출재의 미세조직 및 기계적 성질에 미치는 용체화 온도와 퀜칭 지연의 영향
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김지수, 정제기, 천현석, 김병주, 임차용, 김수현, 최윤석
Korean J. Met. Mater.
2024;62(2):132-141. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.132
Abstract
The effect of solution temperature and quench delay on the microstructure and mechanical properties of an extruded Al-Mg-Si-Cu-Mn alloy was investigated by employing differential scanning calorimetry, transmission electron microscopy, hardness test, and tensile test. The extruded specimens were held at 500 and 540
o
C, respectively, for 80 min for solutionizing.....
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Ti-xMo-2Fe 베타계 타이타늄 합금의 기계적 특성 및 부식 특성에 미치는 Mo의 영향 평가
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박정연, 이재관, 이용재, 이동근
Korean J. Met. Mater.
2024;62(2):125-131. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.125
Abstract
Titanium alloys are currently used in offshore industries. The titanium alloys used in offshore plants need to have excellent corrosion resistance and mechanical properties because offshore plants are exposed to harsh corrosive environments. At this time, the Ti-6Al-4V ELI alloy is mainly used in offshore plants because it has excellent.....
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회귀기반의 동적재료모델을 이용한 Inconel 718 합금의 고온 변형 거동 분석 및 Ring rolling 공정의 적용
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양선영, 박진욱, 윤준석, 이광석, 이동근, 신다슬
Korean J. Met. Mater.
2024;62(2):81-93. Published online 2024 Jan 30
DOI:
https://doi.org/10.3365/KJMM.2024.62.2.81
Abstract
Inconel 718 nickel-based alloy is extensively used in the aerospace industry (e.g., gas turbine engine components) because of its excellent corrosion resistance and high mechanical properties at elevated temperatures. However, there is a certain limit to manufacturing the alloy through plastic deformation due to its high deformation resistance and complicated.....
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Ni-based 초내열합금의 미세조직, 인장특성, δ 석출상에 미치는 열처리 온도의 영향
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송전영, 구지호, 신종호, 조원희, 이초현, 설재복, 마영화
Korean J. Met. Mater.
2024;62(1):32-38. Published online 2023 Dec 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.1.32
Abstract
Here, we investigated the influence of δ-precipitate (orthorhombic D0a Ni
3
Nb-ordered phase) on the room- and high-temperature tensile properties in wrought nickel-based Inconel 625 superalloys subjected to solution and aging heat treatment. Typically, solution heat-treatment temperatures in these alloys affect the solid-state precipitation of δ-phase, which governs high-temperature tensile properties. While.....
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파워 소자의 고속 다이 접합을 위한 5 um Cu@Sn 입자 기반 프리폼의 천이액상 소결접합 특성
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한병조, 조상호, 전강록, 이종현
Korean J. Met. Mater.
2024;62(1):12-21. Published online 2023 Dec 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.1.12
Abstract
To ensure the high-temperature stability of a bondline under next-generation power devices such as SiC semiconductors, a die bonding test was performed by transient liquid-phase (TLP) sinter-bonding using a Sn-coated Cu (Cu@Sn) particle-based preform. Compared to the existing 20 min-bonding result using a 30 μm Cu@Sn particle-based preform, a 5.....
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일방향 응고 CM247LC 초내열합금 크리프 시편 게이지에서 고온 산화가 표면 피트 및 재결정 형성에 미치는 영향
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최병학, 최광수, 한성희, 김대현, 안종기, 강동수, 서성문
Korean J. Met. Mater.
2023;61(12):951-957. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.951
Abstract
This study analyzed a recrystallization phenomenon that occurred simultaneously with hightemperature oxidation on the surface of a directionally solidified CM247LC creep specimen, using optical and scanning electron microscopy. After heat treatment, the surface of the specimen subjected to the creep test at 982oC was oxidized by exposure to high temperature.....
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Sputtering공정 적용 Ag-Ti 조성경사형 박막의 구조분석
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전용민, 유시홍, 김민준, 이성의
Korean J. Met. Mater.
2023;61(12):909-914. Published online 2023 Nov 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.12.909
Abstract
In this study, a composition-gradient thin film was applied for the formation of intermediate layer of Ti seed layer for an stable electrode stack Ag metal layer. Various composition of Ag-Ti hetero metal layer were simultaneously deposited by using the sputtering process with Ti and Ag target, respectively. An intermediate.....
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Korean J. Met. Mater.
2023;61(11):867-873. Published online 2023 Oct 29
DOI:
https://doi.org/10.3365/KJMM.2023.61.11.867
Abstract
Commercial AA1070 alloy for electrical wire is severely deformed by the drawing process when a rod with a diameter of 2 mm is greatly reduced to 0.4 mm by multi-pass. Changes in the microstructure, mechanical properties, and electrical properties of the Al alloy during the wire-drawing process were investigated in.....
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Korean J. Met. Mater.
2023;61(11):815-823. Published online 2023 Oct 29
DOI:
https://doi.org/10.3365/KJMM.2023.61.11.815
Abstract
The microstructure, tensile and fatigue properties of a martensitic stainless steel (MSS) plate with a thickness of 0.152 mm are investigated in this study. The microstructural properties were initially studied using electron backscatter diffraction microscopy. High dislocation densities were observed in the microstructure, along with the rolling texture revealed by.....
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전기화학적 및 고압 수소 분위기하 템퍼드 마르텐사이트강의 수소취화 특성 비교
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김상규, 김재윤, 서현주, 정환교, 박재영, 백운봉, 황병철
Korean J. Met. Mater.
2023;61(11):807-814. Published online 2023 Oct 29
DOI:
https://doi.org/10.3365/KJMM.2023.61.11.807
Abstract
The effect of hydrogen charging methods on the hydrogen embrittlement characteristics of tempered martensitic steels were discussed in terms of hydrogen diffusion behavior. Two tempered martensitic steels with different Si content were fabricated by quenching and tempering. The steel with high Si content had a lower cementite fraction because the.....
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Ti-12.1Mo-1Fe 준안정 베타 합금의 변형 거동에 대한 변형률 속도의 영향
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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
Abstract
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.....
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SA508 Gr.4N Ni-Cr-Mo계 고강도 원자로압력용기용 저합금강의 템퍼취화 거동에 미치는 이상영역 열처리의 영향
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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
Abstract
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.....
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가솔린 터보차저용 Alloy1.4957 내열강의 석출 상 분석
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이종관, 이병주, 이언식
Korean J. Met. Mater.
2023;61(10):721-728. Published online 2023 Sep 25
DOI:
https://doi.org/10.3365/KJMM.2023.61.10.721
Abstract
Recently, strengthened environmental regulations have required the downsizing of gasoline engines, and as a result, demand for gasoline turbochargers has rapidly increased. The vane of a turbocharger controls the flow of gases toward the turbine, and it is manufactured by powder metallurgy due to its complex shape. Gasoline engines have.....
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산소함량에 따른 Ti-6Al-4V 적층제조 조형체의 미세조직 및 기계적 특성 변화
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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
Abstract
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.....
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Web of Science 1
Crossref 3
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코어-쉘 입자를 사용한 금속 접합부 형성의 최근 연구 동향과 입자 종류에 따른 접합 특성 리뷰
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한병조, 김영중, 이종현
Korean J. Met. Mater.
2023;61(9):679-693. Published online 2023 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.9.679
Abstract
With the increasing numbers of electric vehicles and the prevalence of high heat generating devices, recent studies have attempted to address the limitations of conventional solder materials, including their low durability at temperatures exceeding 200 ℃, insufficient mechanical properties in a joint, and low thermal conductivity. Transient liquid-phase (TLP) partial.....
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Web of Science 1
Crossref 2
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Korean J. Met. Mater.
2023;61(9):652-658. Published online 2023 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2023.61.9.652
Abstract
A cold roll-bonding (CRB) process is applied to study the effects of stacking number on the microstructure and mechanical properties of roll-bonded and age-treated Al sheets. Commercial AA1050 and AA6061 sheets with a thickness of 2 mm were stacked alternately on each other to two and four layers, and roll-bonded.....
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Web of Science 3
Crossref 4
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Twin wire arc spray 용사코팅 공정을 통해 제작된 미끄럼 방지 코팅의 열적 특성 및 고온노출 거동 연구
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권한솔, 박영진, 남욱희, 변응선
Korean J. Met. Mater.
2023;61(9):642-651. Published online 2023 May 14
DOI:
https://doi.org/10.3365/KJMM.2023.61.9.642
Abstract
Conventional non-skid coatings for marine construction contain polymeric materials. These materials are generally susceptible to high temperature environments because of their low thermal conductivity and thermal resistance. A metal-based non-skid coating has great potential for high temperature applications, yet, there has only been limited research. In this study, twin wire.....
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Web of Science 1
Crossref 1
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COMSOL을 활용한 신 마그네슘 전해 공정 수치해석 모델 개발
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조매현, 정형준, 강정신, 장근옥
Korean J. Met. Mater.
2023;61(8):625-631. Published online 2023 Jul 24
DOI:
https://doi.org/10.3365/KJMM.2023.61.8.625
Abstract
Magnesium (Mg) has good physical properties including light weight, excellent specific strength and high stiffness, and Mg is used in many fields. But current production methods of Mg have disadvantages, such as the generation of sulfur oxide and chlorine gas. In this situation, The Korea Institute of Geoscience and Mineral.....
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Crossref 2
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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
Abstract
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 WS
2
via solution-process is rare due to the higher temperature.....
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딥코팅 방법을 활용한 게이트 산화물 유전체 및 반도체 박막의 제조 및 박막트랜지스터 응용
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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
Abstract
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.....
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UNS N07718의 묽은 사워(sour) 모사 용액 내 국부 부식 거동
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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
Abstract
The localized corrosion behavior of precipitation-hardened UNS N07718 was investigated by immersion tests in 6 wt% FeCl
3
+ 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% CH
3
COOH. The Ti carbides and Nb-Mo carbides with.....
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Web of Science 1
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Korean J. Met. Mater.
2023;61(7):524-533. Published online 2023 Jun 21
DOI:
https://doi.org/10.3365/KJMM.2023.61.7.524
Abstract
A356 cast aluminum alloy contains 7 at.% Si and 0.3 at.% Mg, producing an approximately 50% eutectic microstructure. This high Si content and various casting conditions play a significant role in strengthening A356 alloy, by controlling the eutectic morphology and precipitates of other intermetallic compounds. Understanding how Si-related precipitates and.....
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Web of Science 1
Crossref 1
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전로 제강 공정에서 초음속 산소 랜스가 2차 연소에 미치는 영향 - 전로 모사 가스 반응로 실험 및 해석
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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
Abstract
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.....
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카본나노튜브/Ecoflex 복합체로 제작된 고신축성 및 고감도 신축성 스트레인 센서
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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
Abstract
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.....
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Web of Science 4
Crossref 5
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Al-Si-Mg합금에서 Mg함량과 주조응고 후 냉각속도가 T5 처리시 기계적 특성에 미치는 영향
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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
Abstract
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
o
C for 1 hr followed by degassing treatment at 720
o
C for 15 min, and poured into a metallic.....
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Web of Science 1
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