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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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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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La과 Mn으로 이중 도핑된 n형 Mg
3
La
0.005
Mn
x
SbBi의 열전특성
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주성재, 손지희, 장정인, 민복기, 김봉서
Korean J. Met. Mater.
2024;62(1):45-50. Published online 2023 Dec 29
DOI:
https://doi.org/10.3365/KJMM.2024.62.1.45
Abstract
Mg
3
Sb
2
-based n-type materials are consisted of earth-abundant elements and possess comparable thermoelectric properties with n-type Bi
2
Te
3
at low temperatures, which make them promising candidates for cooling and power generation applications in terms of cost and performance. Substitution of Sb atom with chalcogen elements (Te, Se S) is a conventional method.....
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소결온도 최적화에 의한 Mg
3
SbBi
0.99
Te
0.01
n형 소재의 열전특성 향상
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주성재, 손지희, 장정인, 김봉서, 민복기
Korean J. Met. Mater.
2023;61(10):785-792. Published online 2023 Sep 25
DOI:
https://doi.org/10.3365/KJMM.2023.61.10.785
Abstract
Mg
3
Sb
2
-based materials are promising candidates to replace n-type Bi
2
Te
3
for cooling and power generation at low temperatures. Generally, the thermoelectric performance of a material is sensitively affected by synthesis process parameters, and among them, sintering temperature (
T
s
) is a critical one. In this study, n-type Mg
3
SbBi
0.99
Te
0.01
polycrystalline samples were fabricated.....
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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
Crossref 2
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La 도핑된 n형 Mg
3
SbBi 열전소재의 합성 및 열전특성
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주성재, 손지희, 장정인, 민복기, 김봉서
Korean J. Met. Mater.
2023;61(6):437-443. Published online 2023 May 18
DOI:
https://doi.org/10.3365/KJMM.2023.61.6.437
Abstract
Mg
3
Sb
2
-based materials are very promising for thermoelectric applications at low temperatures, and are strong candidates to replace n-type Bi
2
Te
3
for cooling and power generation. Substituting Sb atoms with chalcogen elements (S, Se, Te) is a typical method of n-type doping, while doping the Mg site with Group 3 elements (Y,.....
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Crossref 1
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Cu 및 Zr 첨가 A356 합금의 열처리 조건에 따른 상 변화와 기계적 특성 분석
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송태웅, 구자욱, 전승병, 정창열
Korean J. Met. Mater.
2023;61(5):311-323. Published online 2023 Apr 20
DOI:
https://doi.org/10.3365/KJMM.2023.61.5.311
Abstract
Cast A356(Al-Si-Mg) alloys are widely used in automotive and general applications because of their mechanical properties and castability. Al-Si-Mg-(Cu) alloys typically lose their strength above 170 o C due to coarsening of precipitates, which limits their application to components. To maintain their strength at elevated temperature, Al-Si-Mg-(Cu) alloys are modified.....
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Web of Science 1
Crossref 1
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김기범, 최택집, 이태경,
Korean J. Met. Mater.
2022;60(9):654-667. Published online 2022 Aug 30
DOI:
https://doi.org/10.3365/KJMM.2022.60.9.654
Abstract
This study investigated the microstructure and mechanical properties of Mg-1Gd-1Y-1Zn (at.%) alloys containing designed amounts of Ce or La. The Mg
5
(Gd,Zn) phase formed in the as-cast Mg-Gd-Y-Zn-Ce/La alloys and disappeared after a homogenization treatment at 500°C for 24 h. The addition of Ce and La resulted in the formation of.....
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박판주조법으로 제조한 Al-8Zn-2.5Mg-xCu 합금 판재의 미세조직에 미치는 Cu의 영향
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김동국, 조용희, 이윤수, 김용유, 김형욱, 김정기
Korean J. Met. Mater.
2022;60(4):329-339. Published online 2022 Mar 28
DOI:
https://doi.org/10.3365/KJMM.2022.60.4.329
Abstract
The effect of Cu content on the microstructure and mechanical properties of Al-8.0Zn-2.5Mg-xCu (x: 0, 1, 2, 3) aluminum alloys manufactured by the twin-roll casting process was investigated. The Al-8.0Zn-2.5Mg-xCu alloy showed an increase in surface defects with increasing Cu content. This is because the amount of residual liquid in.....
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Web of Science 1
Crossref 1
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박선영, 최한철
Korean J. Met. Mater.
2022;60(4):263-271. Published online 2022 Mar 28
DOI:
https://doi.org/10.3365/KJMM.2022.60.4.263
Abstract
The surface characteristics of a dental implant doped with Si, Mg, Ca, and P ions via plasma electrolytic oxidation (PEO) were investigated using various experimental instruments. Plasma electrolytic oxidation of the alloy was performed in a solution containing Ca, P, Si, and Mg ions at 280 V for 3 min......
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Web of Science 1
Crossref 1
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초음파 미세 표면 냉간단조법(UNSM)을 적용한 AZ31 마그네슘 판재의 단면 미세조직 및 강도 향상 효과 분석
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강명성, 강주희, 박현욱, 김준형, 편영식, 백민재, 이동준, 이승진, 박상후, 김홍물, 박성혁, 최윤석
Korean J. Met. Mater.
2022;60(3):169-179. Published online 2022 Feb 8
DOI:
https://doi.org/10.3365/KJMM.2022.60.3.169
Abstract
An ultrasonic nanocrystal surface modification (UNSM) technique was applied to a 1-mm thick AZ31 magnesium sheet. UNSM is a relatively new surface modification technique in which a hard, hemispherical tip (2.38 mm in diameter) strikes the surface at an ultrasonic frequency to induce plastically deformed gradient microstructures and deep compressive.....
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Web of Science 1
Crossref 1
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A
7
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A7075-T6 합금에서 η' 석출상의 재고용이 기계적 특성에 미치는 영향
Y
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김영위, 조용희, 이윤수, 김형욱, 이제인
Korean J. Met. Mater.
2022;60(1):83-93. Published online 2021 Dec 14
DOI:
https://doi.org/10.3365/KJMM.2022.60.1.83
Abstract
The effects of dissolution of the η′ phase by solution treatment on the mechanical properties of A7075-T6 alloy were investigated. Immediately after solution treatment of the T6 sheet at 450
o
C or higher, elongation significantly increased and dissolution of the η′ phase occurred. η′ is the main hardening phase. After.....
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Web of Science 6
Crossref 7
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고내식 합금도금 PosMAC
®
강판의 개발과 응용 특성
I
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손일령, 김태철, 주광일, 김명수, 김종상
Korean J. Met. Mater.
2021;59(9):613-623. Published online 2021 Aug 4
DOI:
https://doi.org/10.3365/KJMM.2021.59.9.613
Abstract
PosMAC
®
is a hot dipping Zn-Mg-Al coated steel sheet developed by POSCO. PosMAC
®
3.0 shows excellent anti-corrosion performance and is suitable for construction and solar energy systems in severe corrosive environments. PosMAC
®
1.5 has a superior surface quality and is preferred for automotive and home appliances. The advanced anti-corrosion properties of PosMAC
®
.....
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Web of Science 2
Crossref 3
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Al-Mg-Si 합금에서 열처리가 열확산도와 부식특성에 미치는 영향
Y
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김유미, 최세원, 김영찬, 강창석
Korean J. Met. Mater.
2021;59(8):582-588. Published online 2021 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2021.59.8.582
Abstract
The effect of the heat treatment on the Mg
2
Si phase in Al-Mg-Si alloy was investigated by a laser flash apparatus (LFA), Differential scanning calorimetry (DSC) and corrosion test. The alloy samples were solution treated at 590
o
C for a half hour followed by warm water quenching, and then aged in.....
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Web of Science 3
Crossref 5
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T6 열처리에 의한 Al-Mg-Si 합금의 비등방성 석출물 형상을 고려한 확률 의존적 석출강화효과
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최승규, 김광훈, 김진평, 김세훈, 손승배, 이석재
Korean J. Met. Mater.
2021;59(8):515-523. Published online 2021 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2021.59.8.515
Abstract
This study proposed a constitutive equation to predict the change in yield strength according to the behavior of β″ metastable precipitates, which have a profound effect on strength among materials precipitated during the T6 heat treatment of Al-Mg-Si alloy. The β″ precipitate is a metastable phase before it becomes a.....
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Web of Science 5
Crossref 5
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컬러강판 불연성 및 가공성에 미치는 무기충진제 첨가량의 영향
M
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홍문희, 김인규, 윤혜정
Korean J. Met. Mater.
2020;58(11):768-775. Published online 2020 Oct 15
DOI:
https://doi.org/10.3365/KJMM.2020.58.11.768
Abstract
Recent large-scale fires in buildings and logistic warehouses have become a major social issue, involving both property loss and multiple casualties. To make color coated steel sheets non-combustible and/or have anti-fire properties, various ways of optimizing manufacturing parameters have been investigated for outer, inner, roof and ceiling panels. In the.....
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Al-Mg-Si 합금의 초기 석출물이 비대칭 압연에 의한 전단변형에 미치는 영향 : 집합조직과 성형성
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채원기, 김봉규, 이종범, 한준현
Korean J. Met. Mater.
2020;58(10):703-714. Published online 2020 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2020.58.10.703
Abstract
Al-Mg-Si alloy was rolled asymmetrically at several temperatures to apply shear deformation, and the effects of the initial precipitate on shear deformation, texture evolution, formability, and plastic anisotropy were studied. Texture was analyzed using a EBSD, and the formability and plastic anisotropy of the specimen were evaluated using the value.....
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Web of Science 7
Crossref 8
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염수환경 내 Zn-Al-Mg 합금도금강재의 공정조직 부식거동
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이재원, 오세영, 박보라, 오민석, 김성진
Korean J. Met. Mater.
2020;58(9):610-616. Published online 2020 Aug 19
DOI:
https://doi.org/10.3365/KJMM.2020.58.9.610
Abstract
To clearly understand the effect of the eutectic structure in the Zn-Al-Mg alloy coating on the corrosion behaviors in chloride containing aqueous environments, a bulk Zn-MgZn
2
sample was fabricated by diffusion bonding process, and a variety of experiments, such as electrochemical polarization and galvanic corrosion measurements, salt spray tests, and.....
More
Web of Science 7
Crossref 5
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무반사 코팅을 위한 MgF
2
나노입자 합성과 박막 부착력 향상을 위한 연구
B
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송병관, 정재용, 조영래, 나종주, 김정완, 김영국
Korean J. Met. Mater.
2020;58(3):201-206. Published online 2020 Feb 3
DOI:
https://doi.org/10.3365/KJMM.2020.58.3.201
Abstract
Anti-reflective (AR) coatings are popular because they offer high durability with effective reflectance and glare reduction, and they can endure both physical and environmental damage. Magnesium fluoride (MgF
2
) has been used as a nanoparticle coating on AR coating materials by many researchers because they exhibit high transmittance and antireflection characteristics.....
More
Web of Science 2
Crossref 2
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7
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7003 알루미늄 합금의 기계적 성질 및 에너지 흡수능에 미치는 열처리 조건의 영향
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김희주, 정제기, 김수현, 임차용, 최윤석
Korean J. Met. Mater.
2020;58(1):7-16. Published online 2019 Dec 12
DOI:
https://doi.org/10.3365/KJMM.2020.58.1.7
Abstract
The effects of heat treatment conditions on the mechanical properties and energy absorption capacity of 7003 (Al-6Zn-0.6Mg) aluminum alloy were studied. The extruded material was heat treated at various temperatures to prepare annealed or aged specimens. Tensile tests, hardness measurements, electron backscatter diffraction characterizations, and differential scanning calorimeter analyses were.....
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Web of Science 5
Crossref 6
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NdFeB 자석 스크랩을 이용한 Mg-Cu-Gd-Nd 비정질 합금의 제조 및 특성
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윤덕환, 민홍, 채홍준, 이진규
Korean J. Met. Mater.
2019;57(10):617-623. Published online 2019 Sep 6
DOI:
https://doi.org/10.3365/KJMM.2019.57.10.617
Abstract
In the present study, new Mg-based bulk metallic glasses have been developed in a Mg-Cu-GdNd based system using a Mg-Nd byproduct obtained from the recycling process of NdFeB magnet scrap through liquid metal extraction. The Mg-Cu-Gd-Nd bulk metallic glasses with a diameter of 2 mm are fabricated by injection casting.....
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Mg-Zn합금의 압출 공정 중 동적 석출 거동에 대한 고찰
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이광철, 나민영, 장혜정, 차필령, 김유찬, 석현광
Korean J. Met. Mater.
2019;57(9):555-561. Published online 2019 Aug 21
DOI:
https://doi.org/10.3365/KJMM.2019.57.9.555
Abstract
The dynamic precipitation evolution of Mg-3 wt% Zn alloy during extrusion was evaluated in this study. Precipitation evolution during aging has been well investigated for the Mg-Zn alloy, which is known as static precipitation. However, little attention has been given to dynamic precipitation in Mg-Zn alloy. In order to evaluate.....
More
Crossref 1
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비기저면 집합조직을 가지는 마그네슘 합금의 고속압연 온도 변화에 따른 압연재 미세조직 변화
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이수진, 김예진, 이정훈, 박성혁
Korean J. Met. Mater.
2019;57(8):482-490. Published online 2019 Jul 4
DOI:
https://doi.org/10.3365/KJMM.2019.57.8.482
Abstract
In this study, the effects of rolling temperature on the microstructural characteristics of a highspeed-rolled Mg alloy with a non-basal texture were investigated. To this end, commercial AZ31 alloy samples in which the basal poles of most grains were tilted at an angle of 45° from the normal direction (ND).....
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Web of Science 2
Crossref 3
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박판주조공정으로 제조한 Al-8.0Zn-2.5Mg-2.0Cu 합금 판재의 소부경화특성에 미치는 예비시효의 영향
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허지구, 이윤수, 김민석, 김형욱, 김양도
Korean J. Met. Mater.
2019;57(6):396-404. Published online 2019 May 16
DOI:
https://doi.org/10.3365/KJMM.2019.57.6.396
Abstract
The effects of natural and pre-aging on the microstructure and mechanical properties of Al-8.0Zn-2.5Mg-2.0Cu aluminum alloy sheet fabricated by twin roll casting were investigated. Immediately after solution treatment, the Al-8.0Zn-2.5Mg-2.0Cu alloy sheet had a yield strength of 173 MPa and elongation of 19.5%. The hardness of the Al-8.0Zn-2.5Mg-2.0Cu alloy sheet.....
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Web of Science 8
Crossref 9
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아연-마그네슘-알루미늄 합금도금강판의 도장 내식성 및 밀착성
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이재원, 박보라, 김성진
Korean J. Met. Mater.
2019;57(2):77-83. Published online 2019 Jan 9
DOI:
https://doi.org/10.3365/KJMM.2019.57.2.77
Abstract
Zn-Al-Mg alloy galvanized steel sheets have excellent corrosion resistance and improved cut-edge corrosion resistance. Most of the galvanized steel sheets used for outdoor applications are coated again on the galvanizing layer, or after a plastic film is laminated. As the corrosion products formed by the corrosion of Zn accumulate over.....
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Web of Science 10
Crossref 7
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Korean J. Met. Mater.
2018;56(7):524-531. Published online 2018 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.7.524
Abstract
To improve the hydrogen uptake and release properties of magnesium (Mg), five weight percent of graphene was added to pre-milled Mg by milling in hydrogen (reaction-involving milling). The hydrogen uptake and release properties of the graphene-added Mg (named Mg-5graphene) were investigated. Premilling of Mg (for 24 h) and then adding.....
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Crossref 10
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물유리계 바인더의 첨가제가 Al-Si7Mg 합금 주조 시 소착에 미치는 영향
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배민아, 김명환, 박정욱, 이만식
Korean J. Met. Mater.
2018;56(4):327-333. Published online 2018 Apr 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.4.327
Abstract
Traditional organic binders used by the foundry industry produce problems such as generation of volatile organic compounds(VOCs), smoke and etc. A water glass binder system has been developed to improve the casting strength and to solve the environmental problems. However the water glass binder has a serious problem of sand.....
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Crossref 3
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Korean J. Met. Mater.
2018;56(3):244-251. Published online 2018 Mar 6
DOI:
https://doi.org/10.3365/KJMM.2018.56.3.244
Abstract
Samples with compositions of 99 w/o MgH
2
+1 w/o Zn(BH
4
)
2
(designated MgH
2-
1Zn(BH
4
)
2
) and 96 w/o MgH
2
+2 w/o Zn(BH
4
)
2+
2 w/o Ni (designated MgH
2-
2Zn(BH
4
)
2-
2Ni) were prepared by milling in a planetary ball mill in a hydrogen atmosphere (reaction-involving milling). The hydrogen release properties of MgH
2-
1Zn(BH
4
)
2
and MgH
2-
2Zn(BH
4
)
2-
2Ni were compared. A larger quantity.....
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Crossref 1
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Korean J. Met. Mater.
2018;56(2):155-162. Published online 2018 Feb 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.2.155
Abstract
In this work, MgH
2
, Mg
2
Ni, and Ni were added to Mg in order to improve the hydrogen-storage properties of Mg. A 84 wt% Mg + 10 wt% MgH
2
+ 5 wt% Mg
2
Ni + 1 wt% Ni sample (designated the Mg-based sample) was prepared by milling under a hydrogen atmosphere in.....
More
Crossref 1
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Korean J. Met. Mater.
2018;56(1):59-65. Published online 2018 Jan 1
DOI:
https://doi.org/10.3365/KJMM.2018.56.1.59
Abstract
In this work, Mg
2
Ni and Ni were added to MgH
2
in order to improve the hydrogen-storage properties of Mg. A 94 wt% MgH
2
+5 wt% Mg
2
Ni+1wt% Ni (named 94MgH
2
+5Mg
2
Ni+1Ni) sample was prepared by milling in a hydrogen atmosphere in a planetary ball mill for 5 h. The Mg
2
Ni was hydrided during.....
More
Crossref 8
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