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육방정 질화붕소 나노입자의 결정성에 미치는 불화칼슘 첨가의 영향
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정재용, 김양도, 김영국
Korean J. Met. Mater.
2018;56(12):915-920. Published online 2018 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.12.915
Abstract
With the development of modern microelectronics technologies, the power density of electronic devices is rapidly increasing, due to the miniaturization or integration of device elements which operate at high frequency, high power conditions. Resulting thermal problems are known to cause power leakage, device failure and deteriorated performance. To relieve heat.....
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Ni 박막 위 20 nm급 고정렬 Pt 크로스-바 구조물의 형성 방법
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박태완, 정현성, 조영래, 이정우, 박운익
Korean J. Met. Mater.
2018;56(12):910-914. Published online 2018 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.12.910
Abstract
Since catalyst technology is one of the promising technologies to improve the working performance of next generation energy and electronic devices, many efforts have been made to develop various catalysts with high efficiency at a low cost. However, there are remaining challenges to be resolved in order to use the.....
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Korean J. Met. Mater.
2018;56(12):900-909. Published online 2018 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.12.900
Abstract
A ZnO/TiO2 photocatalyst decorated with PbS quantum dots (QDs) was synthesized to achieve high photocatalytic efficiency for the decomposition of dye in aqueous media. A TiO2 porous layer, as a precursor photocatalyst, was fabricated using micro-arc oxidation, and exhibited irregular porous cells with anatase and rutile crystalline structures. Then, a.....
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전기 방사를 이용한 1D / 2D 하이브리드 구조 고활성 MoS
2
/ CNF 수소 발생 촉매의 합성 및 특성 분석
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이정훈, 박유세, 장명제, 박성민, 이규환, 최우성, 최승목, 김양도
Korean J. Met. Mater.
2018;56(12):885-892. Published online 2018 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.12.885
Abstract
Molybdenum disulfide (MoS2) based electrocatalysts have been proposed as substitutes for platinum group metal (PGM) based electrocatalyst to hydrogen evolution reaction (HER) in water electrolysis. Here, we studied MoS2/CNFs hybrid catalyst prepared by electrospinning method with heat treatment for polymer electrolyte membrane(PEM) water electrolysis to improve the HER activity. The.....
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나노구조 (W,Ti)C-Graphene 복합재료 급속소결
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김성은, 손인진
Korean J. Met. Mater.
2018;56(12):854-860. Published online 2018 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.12.854
Abstract
In spite of the many attractive properties of (W,Ti)C, its low fracture toughness limits its wide application. To improve the fracture toughness generally a second phase is added to fabricate a nanostructured composite. In this regard, graphene was considered as the reinforcing agent of (W,Ti)C. (W,Ti)C-graphene composites that were sintered.....
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신축성 금속 나노선 압저항 전극 기반 로젯 스트레인 센서
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김강현, 차재경, 김종만
Korean J. Met. Mater.
2018;56(11):835-843. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.835
Abstract
In this work, we report a delta rosette strain sensor based on highly stretchable silver nanowire (AgNW) percolation piezoresistors. The proposed rosette strain sensors were easily prepared by a facile twostep fabrication route. First, three identical AgNW piezoresistive electrodes were patterned in a simple and precise manner on a donor.....
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Korean J. Met. Mater.
2018;56(11):829-834. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.829
Abstract
Although magnesium-based alloys are attractive materials for hydrogen storage applications, their activation properties, hydrogenation/dehydrogenation kinetics, thermodynamic equilibrium parameters, and degradation characteristics must be improved for practical applications. Further, magnesium poses several risks, including explosion hazard, environmental pollution, insufficient formability, and industrial damage. To overcome these problems, CaO-added Mg alloys, also.....
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고압 다이캐스팅용 알루미늄 합금의 열전도성 및 주조성에 미치는 첨가원소의 영향
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김철우, 김영찬, 김정한, 조재익, 오민석
Korean J. Met. Mater.
2018;56(11):805-812. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.805
Abstract
High pressure die casting is one of the precision casting methods. It is highly productivity and suitable for manufacturing components with complex shapes and accurate dimensions. Recently, there has been increasing demand for efficient heat dissipation components, to control the heat generated by devices, which directly affects the efficiency and.....
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핫스탬핑용 30MnB5강의 템퍼링 조건에 따른 미세조직 및 기계적 물성 연구
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정준영, 박상천, 신가영, 이창욱, 김태정, 최민수
Korean J. Met. Mater.
2018;56(11):787-795. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.787
Abstract
The effects of tempering condition on the microstructure and mechanical properties of 30MnB5 hot stamping steel were investigated in this study. Before the tempering, hot-stamped 30MnB5 steel was composed of only α′-martensite microstructure without precipitates. After the tempering at 180 ℃ for 120 min, nano-sized ε-carbides were precipitated in the.....
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고온 변형 곡선을 이용한 동적 재결정 해석과 동적 상변태의 조기 예측
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박노근
Korean J. Met. Mater.
2018;56(11):779-786. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.779
Abstract
There have been previous attempts to observe the occurrence of dynamic ferritic transformation at temperatures even above Ae3 in a low-carbon steel, and not only in steels, but recently also in titanium alloys. In this study, a new approach is proposed that involves treating true stress-true strain curves in uniaxial.....
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Seed를 이용한 단결정 초내열합금 CMSX-4에서 응고속도 및 열처리에 따른 미세조직 변화
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권순철, 신종호, 임근영, 성기태, 윤병관, 정의석, 이재현
Korean J. Met. Mater.
2018;56(10):745-754. Published online 2018 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.10.745
Abstract
The CMSX-4 superalloy including refractory elements was directionally solidified using the seed of a [001] single crystal to control the growth direction to [001], where solidification velocity was changed from 25 to 160 μm/s. In the log-log plot between spacing and solidification velocity, the primary dendrite arm spacing and secondary.....
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온간 압연 및 냉간 압연으로 제조한 AZ31 마그네슘 합금 판재의 집합조직 및 성형성 비교
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조수미, 유봉선, 김영민
Korean J. Met. Mater.
2018;56(10):734-744. Published online 2018 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.10.734
Abstract
The microstructure, texture evolution, and room temperature formability of warm-rolled and coldrolled AZ31 magnesium sheets were investigated in this study. The localized deformation regions, i.e., shear bands, formed during warm-rolling and cold-rolling mainly provide nucleation sites for recrystallization, but the orientation of the recrystallized grains nucleated on the shear bands.....
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Metal Injection Molding 공정으로 제조된 W-7Ni-3Fe 텅스텐 중합금의 미세조직 및 기계적 특성에 미치는 열처리의 영향
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윤성준, 주연아, 윤태식, 이기안
Korean J. Met. Mater.
2018;56(10):727-733. Published online 2018 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.10.727
Abstract
This study investigated the microstructure and room temperature mechanical properties of W-7Ni-3Fe (wt%) tungsten heavy alloy (as-fabricated) which was manufactured by metal injection molding (MIM). To identify the effect of heat treatment on the W-7Ni-3Fe alloy, its properties were compared after heattreatment (1,100 oC for 1 hour) in vacuum atmosphere......
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Korean J. Met. Mater.
2018;56(10):718-726. Published online 2018 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.10.718
Abstract
In this work, we studied the formation of partially stabilized zirconia by a high energy ball milling (HEBM) approach. Zirconia powder was mixed with 8 mol% MgO and the powder mixture was milled for 10 hours. The structural and morphological evolutions of the powder particles were studied using X-ray diffraction.....
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항공용 고강도 7xxx계 알루미늄 합금의 3.5% NaCl 수용액에서의 응력부식균열 저항성
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이유림, 최희수, 안수진, 이철주, 김상식
Korean J. Met. Mater.
2018;56(10):708-717. Published online 2018 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.10.708
Abstract
For proper maintenance and inspection scheduling of aircraft, it is extremely important to measure the resistance to stress corrosion cracking (SCC) behavior of aluminum alloys used for aircraft structures. The SCC resistances of high-strength 7xxx-series aluminum alloys, including 7050-T7451, 7475-T7351 and 7140-T7451, were evaluated along longitudinal (L) and transverse (T).....
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AZ80과 TAZ711 마그네슘 압출재의 상온 및 고온 인장 특성과 고주기 피로 특성
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이상원, 김상훈, 박성혁
Korean J. Met. Mater.
2018;56(10):699-707. Published online 2018 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.10.699
Abstract
The microstructure, tensile properties at room and elevated temperatures, and high-cycle fatigue behavior of an extruded Mg-7Sn-1Al-1Zn (TAZ711) alloy were investigated in comparison with those of an Mg-8Al-0.5Zn (AZ80) alloy extruded under the same conditions. The extruded AZ80 alloy exhibited a fully recrystallized structure, whereas the extruded TAZ711 alloy had.....
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Korean J. Met. Mater.
2018;56(9):693-698. Published online 2018 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.9.693
Abstract
Ge-doped higher manganese silicides (HMSs) MnSi
1.72–1.73
:Ge
m
(
m
= 0.01-0.04) were prepared and their thermoelectric properties were studied. HMS powders were synthesized by solid-state reaction of raw material powders (Mn, Si, and Ge) at 1273 K for 6 h in vacuum, and hot-pressed at 1173 K for 2 h under 70.....
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용융방사법으로 제작된
p
-type 다결정 Si의 열전특성 연구
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선주형, 임영수
Korean J. Met. Mater.
2018;56(9):686-692. Published online 2018 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.9.686
Abstract
Thermoelectric energy conversion has attracted much attention as an efficient and environment-friendly energy technology. Thermoelectric energy conversion performance is directly influenced by the figure of merit (
ZT
) of the thermoelectric material, however, most known thermoelectric materials with high
ZT
contain toxic and/or scarce elements. Herein, we report the thermoelectric properties.....
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Korean J. Met. Mater.
2018;56(9):680-685. Published online 2018 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.9.680
Abstract
This study elucidates the effects of annealing on the properties of Fe-Si-Al flakes. The changes of the DO
3
phase, the lattice parameter and the grain size of the flakes were analyzed by X-ray peak broadening and shift. Static magnetic properties, namely, coericivity and saturation magnetization, were analyzed by a vibration.....
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Korean J. Met. Mater.
2018;56(9):664-673. Published online 2018 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.9.664
Abstract
This study examined the influence of nanosized aluminum nitride (AlN) powders (0, 0.01, 0.05, 0.10, 0.30, and 0.50 wt%), on an Al4047-based filler metal. Nanosized AlN powders were dispersed uniformly into the filler metal by a mechanical mixing and melting route using a stainless steel propeller. The influences of nanosized.....
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Korean J. Met. Mater.
2018;56(9):658-663. Published online 2018 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.9.658
Abstract
Titanium nitride (TiN) has been used extensively in coating materials and cutting tools because of its attractive properties, which include low density, high melting point, high hardness and thermodynamic stability. However, like many ceramic materials, its low fracture toughness limits wide industrial application. The methods generally utilized to improve its.....
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ICCP 양극 배치 변화에 따른 수중 전자기 신호 변화 분석
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이상규, 정현주, 양창섭
Korean J. Met. Mater.
2018;56(8):628-634. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.628
Abstract
The impressed current cathodic protection (ICCP) is widely used for preventing galvanic corrosion and it strongly influences the underwater electromagnetic signals of a surface ship. For military use, the signals should be reduced to avoid threats such as modern naval weapons triggered by the signals. We analyzed the underwater electric.....
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Ru와 Co의 차세대 반도체 배선 적용성 연구
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최두호
Korean J. Met. Mater.
2018;56(8):605-610. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.605
Abstract
Severe resistivity size effect in Cu interconnects is attributed to the relatively long bulk electron mean free path (39 nm at 298 K), which is inherently determined by phonon scattering. In this regard, Ru and Co have been recently considered as attractive alternatives for next-generation interconnect materials because the significantly.....
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해양플랜트용 YP 690 MPa급강 다층 용접부의 재열 균열 특성 평가
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신용택, 조영주
Korean J. Met. Mater.
2018;56(8):580-588. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.580
Abstract
This study evaluated the relationship between reheat cracking that occurs in the reheated weld zone formed by subsequent multi-pass welding and the preheat/interpass temperature. The multi-pass weldment was YP 690 MPa high-strength steel, which is used in mobile offshore platform units. The welding process was flux-cored arc welding (FCAW), which.....
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탄소함량이 자동차용 초고강도 철강소재의 부식 및 수소 확산 거동에 미치는 영향
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황은혜, 성환구, 김성진
Korean J. Met. Mater.
2018;56(8):570-579. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.570
Abstract
Recently developed ultra-strong GIGA STEEL exhibites superior mechanical properties, with a high tensile strength of more than 1.5 GPa and good impact toughness. Nevertheless, its application to auto parts has been severely restricted, mainly due to a substantial reduction in the resistance to hydrogen embrittlement (HE) induced by aqueous corrosion......
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극저온압연한 저탄소망간강의 초기 미세조직과 어닐링 조건이 기계적성질에 미치는 영향
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이종철, 남원종
Korean J. Met. Mater.
2018;56(8):551-560. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.551
Abstract
The effect of annealing on the microstructural evolution of the matrix in low carbon manganese steels with different initial microstructures, including martensite, bainite and a mixture of ferrite and pearlite, was investigated in conjunction with the charge in mechanical properties. During annealing, steels with a deformed ferrite + pearlite microstructure.....
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Korean J. Met. Mater.
2018;56(7):544-550. Published online 2018 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.7.544
Abstract
Iodine-doped n-type Bi
2-x
Sb
x
Te
3-y
Se
y
:I
m
(x = 0.1–0.2, y = 0.15–0.6, and m = 0.0025–0.005) quaternary solid solutions were prepared by encapsulated melting (EM) and hot pressing (HP). The lattice constants of the resulting materials decreased with increasing Sb and Se contents, whereas the amount of I dopant was too small to.....
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용융방사법으로 제작된 Cu
1.98
Se의 열전특성
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탁장렬, 임영수
Korean J. Met. Mater.
2018;56(7):532-537. Published online 2018 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.7.532
Abstract
Cu
2
Se exhibits very low thermal conductivity and the origin is known to be the "liquid-like" behavior of Cu ions around the sub-lattice of Se. Due to its very high
ZT
, research interest in the thermoelectric properties of this material has been increasing rapidly. However, most studies have used a conventional melting.....
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전자스크랩으로부터 티오요소에 의한 은(Ag) 침출
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소홍일, 이주은, 조연철, 안재우, 류호진
Korean J. Met. Mater.
2018;56(7):511-517. Published online 2018 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.7.511
Abstract
The leaching behavior of silver from electronic scrap using acidic thiourea solution was studied. The results showed that the silver leaching percentage was affected by the concentration of thiourea and hydrochloric acid, the oxidant such as ferric ions, solid-liquid ratio, temperature, rpm, etc. The leaching percentage of silver decreased with.....
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선박 및 해양구조물용 항복강도 460 MPa급 강재의 FCA 다층 용접금속부 특성에 미치는 규소의 영향
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김종식, 이명수, 정종민, 최한글, 정상훈, 강창룡
Korean J. Met. Mater.
2018;56(7):499-504. Published online 2018 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.7.499
Abstract
This study investigated the effect of Si on the characteristics of FCA multi-layer weld metal with 460 MPa yield strength grade steels for ships and marine structures. The effect on microstructure was evaluated by tensile, charpy impact and CTOD testing of 4 FCAW welds containing various C and Si contents......
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