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Korean J. Met. Mater.
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Korean Journal of Metals and Materials
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Hydrogen Storage Properties of Mg Alloy Prepared by Incorporating Polyvinylidene Fluoride via Reactive Milling
Myoung Youp Song, Young Jun Kwak
Korean J. Met. Mater.
2018;56(12):878-884. Published online 2018 Dec 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.12.878
Abstract
In the present work, we selected a polymer, polyvinylidene fluoride (PVDF), as an additive to improve the hydrogenation and dehydrogenation properties of Mg. 95 wt% Mg + 5 wt% PVDF (designated Mg-5PVDF) samples were prepared via milling in hydrogen atmosphere (reactive milling), and the hydrogenation and dehydrogenation characteristics of the.....
More
Crossref 5
Hydrogenation Properties of MgH
2
–CaO Composites Synthesized by Hydrogen-Induced Mechanical Alloying
Min Gyeom Kim, Jeong-Heum Han, Young-Hwan Lee, Jong-Tae Son, Tae Whan Hong
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.....
More
Thermoelectric Properties of P-type (Ce
1-z
Yb
z
)
0.8
Fe
4-x
Co
x
Sb
12
Skutterudites
Deok-Yeong Choi, Ye-Eun Cha, Il-Ho Kim
Korean J. Met. Mater.
2018;56(11):822-828. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.822
Abstract
P-type Ce/Yb-filled skutterudites were synthesized, and their charge transport and thermoelectric properties were investigated with partial double filling and charge compensation. In the case of (Ce1-zYbz)0.8Fe4Sb12 without Co substitution, the marcasite (FeSb2) phase formed alongside the skutterudite phase, but the generation of the marcasite phase was inhibited by increasing Co.....
More
Crossref 1
Comparative Study of Estimation Methods of the Endpoint Temperature in Basic Oxygen Furnace Steelmaking Process with Selection of Input Parameters
Tae Chang Park, Beom Seok Kim, Tae Young Kim, Il Bong Jin, Yeong Koo Yeo
Korean J. Met. Mater.
2018;56(11):813-821. Published online 2018 Nov 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.11.813
Abstract
The basic oxygen furnace (BOF) steelmaking process in the steel industry is highly complicated, and subject to variations in raw material composition. During the BOF steelmaking process, it is essential to maintain the carbon content and the endpoint temperature at their set points in the liquid steel. This paper presents.....
More
Crossref 9
Charge Transport and Thermoelectric Properties of (La
1−z
Pr
z
)
0.8
Fe
4−x
Co
x
Sb
12
Skutterudites
Ye-Eun Cha, Il-Ho Kim
Korean J. Met. Mater.
2018;56(10):772-778. Published online 2018 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.10.772
Abstract
Partially La/Pr-double-filled and Co-substituted (La
1−z
Pr
z
)
0.8
Fe
4−x
Co
x
Sb
12
skutterudites were synthesized by encapsulated melting and vacuum hot pressing. (La,Pr)Sb
2
phases were not formed because the partial filling did not exceed the filling fraction limit, and the amount of secondary phase FeSb
2
also decreased as the Co content increased. Electrical conductivity decreased with increasing.....
More
Crossref 2
Diluents Role in Extraction and Possible Separation of Light Rare Earth Elements from Chloride Solutions by using Cyanex
®
272 used as an Extractant
Rajesh Kumar Jyothi, Hae-Rim Kim, Joon Soo Kim, Kyeong-Woo Chung, Jin-Young Lee
Korean J. Met. Mater.
2018;56(10):763-771. Published online 2018 Oct 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.10.763
Abstract
The present paper deals with liquid-liquid extraction studies and the possible separation of light rare earths (LREs) from chloride solutions. Aromatic diluents such as benzene, toluene and xylene were tested for LREs extraction and possible separation from chloride solutions. Bis(2,4,4-triethylpentyl)phosphinic acid (trade name Cyanex
®
272) was used as an extractant.....
More
Crossref 3
Effect of MgO Addition on the Monoclinic to Tetragonal Transition of ZrO
2
Fabricated by High Energy Ball Milling
Ashutosh Sharma, Byungmin Ahn
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.....
More
Crossref 5
Thermoelectric Properties of Ge-doped Higher Manganese Silicides MnSi
1.72-1.73
:Ge
m
Sol-Bin Park, In-Jae Lee, Il-Ho Kim
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.....
More
Crossref 4
Effects of Annealing on Structure and Magnetic Properties of Fe-Si-Al Flakes
Pyungwoo Jang
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.....
More
Crossref 5
Influence of Nanosized AlN Powders on the Microstructure, Brazeability, and Tensile Properties of Al-based Filler for Low Temperature Al/Cu Dissimilar Brazing
Do Hyun Jung, Jae Pil Jung
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.....
More
Crossref 1
Effect of BN Addition on the Mechanical Properties of TiN-BN Composites
Woo-Jin Cho, In-Jin Shon
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.....
More
Crossref 16
Characteristics of Electroless Sn Plating Electrolyte using a Choline Chloride-Based Ionic Liquid
Chieon Park, Bongyoung Yoo, Joonkyun Lee
Korean J. Met. Mater.
2018;56(9):645-651. Published online 2018 Sep 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.9.645
Abstract
In the present study, a choline chloride(ChCl)-based ionic liquid(IL) was used as an electrolyte to confirm the characteristics of electroless tin plating. The effect of the type of additive and reducing agent, as well as the addition of complexing agent and water, on the properties of the ChCl-based IL, including.....
More
Crossref 4
Raising the Dehydrogenation Rate of a Mg-CMC (Carboxymethylcellulose, Sodium Salt) Composite by Alloying Ni via Hydride-Forming Milling
Myoung Youp Song, Eunho Choi, Young Jun Kwak
Korean J. Met. Mater.
2018;56(8):620-627. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.620
Abstract
In our previous work, samples with a composition of 95 wt% Mg + 5 wt% CMC (Carboxymethylcellulose, Sodium Salt, [C
6
H
7
O
2
(OH)
x
(C
2
H
2
O
3
Na)
y
]
n
) (named Mg-5 wt%CMC) were prepared through hydride-forming milling. Mg-5 wt%CMC had a very high hydrogenation rate but a low dehydrogenation rate. Addition of Ni to Mg is known to increase.....
More
Crossref 5
Hydrogen Uptake and Release Characteristics of Mg-xTaF
5
-xVCl
3
(x=1.25, 2.5, and 5)
Myoung Youp Song, Young Jun Kwak
Korean J. Met. Mater.
2018;56(8):611-619. Published online 2018 Aug 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.8.611
Abstract
TaF
5
and VCl
3
were chosen as additives to enhance the hydrogen uptake and release rates of Mg. The total content of the additives was not more than 10 wt% since too high content reduces the fraction of Mg and thus the hydrogen storage capacity of the alloys. Samples with compositions.....
More
Crossref 7
Charge Transport and Thermoelectric Properties of N-type Bi
2-x
Sb
x
Te
3-y
Se
y
:I
m
Prepared by Encapsulated Melting and Hot Pressing
Woo-Jin Jung, Hyeok-Jin Kim, Il-Ho Kim
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.....
More
Crossref 8
Hydrogen Storage Properties of Mg-Graphene Composites
Myoung Youp Song, Young Jun Kwak, Eunho Choi
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.....
More
Crossref 10
Effects of Direct Current on the Wetting between Molten Al and a Graphite Substrate
In-Jin Shon
Korean J. Met. Mater.
2018;56(7):505-510. Published online 2018 Jul 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.7.505
Abstract
Graphite fiber attracted much attention in the area of aluminum based composite due to its low density and high strength. However, one of the major drawbacks in fabricating graphite reinforced metal matrix composites (MMCs) is that aluminum generally does not wet graphite. Therefore, it is difficult to impregnate the graphite.....
More
Crossref 3
Phase-field Modeling of Precipitate Behavior in RPV Steel Using CALPHAD Database
Kunok Chang, Junhyun Kwon, Gyeong-Geun Lee
Korean J. Met. Mater.
2018;56(6):472-478. Published online 2018 Jun 4
DOI:
https://doi.org/10.3365/KJMM.2018.56.6.472
Abstract
We developed a multi-scale modeling framework using the thermodynamic UW1 database of the Fe-Mn-Ni-Si quaternary system. To obtain input data for the phase-field model, such as mobility and interfacial energy data, we used DICTRA software and the TC-PRISMA package with the commercial TCFE8 and MOBFE3 databases. Using the developed framework,.....
More
Crossref 1
Thermoelectric Properties of Partially Double-filled (Ce
1-z
Nd
z
)
y
Fe
4-x
Co
x
Sb
12
Skutterudites
Ye-Eun Cha, Il-Ho Kim
Korean J. Met. Mater.
2018;56(6):465-471. Published online 2018 Jun 4
DOI:
https://doi.org/10.3365/KJMM.2018.56.6.465
Abstract
(Ce
1-z
Nd
z
)
y
Fe
4-x
Co
x
Sb
12
skutterudites were prepared by encapsulated melting, annealing, and hot pressing. The formation of a marcasite phase (FeSb
2
) was significantly suppressed by partially filling the voids with Ce/Nd and making a Co substitution at the Fe site. Both the Hall and the Seebeck coefficient values were positive, indicating that all.....
More
Crossref 4
Effect of Via Pitch on the Extrusion Behavior of Cu-filled TSV
Seho Kee, Wonjoong Kim, Jaepil Jung, Minhyung Choi
Korean J. Met. Mater.
2018;56(6):449-458. Published online 2018 Jun 4
DOI:
https://doi.org/10.3365/KJMM.2018.56.6.449
Abstract
In this study, the extrusion behavior of Cu fill material in a through-Si-via (TSV) subjected to thermal loading was investigated. The Cu filling of the TSV was accomplished using pulse periodic reverse (PPR) electroplating. To study the extrusion, TSVs of varying via pitch were filled with Cu by electroplating. Defect-free Cu.....
More
Crossref 4
Evaluations of Hydrogen Permeation on Ni-SCYb Nano-Composites Membrane by Sol-Gel Methods
Min Gyeom Kim, Tae Whan Hong
Korean J. Met. Mater.
2018;56(5):406-411. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.406
Abstract
Industrially meaningful hydrogen production process from mixture or syngas certainly must have a cooling process, which is typically pressure swing adsorption (PSA). However, the PSA process involves an exothermic reaction during adsorption. Recently, hydrogen separation research has been in progress in order to develop a cooling process to minimize or.....
More
Crossref 1
A Study of Silicon Crystallization Dependence upon Silicon Thickness in Aluminum-induced Crystallization Process
Doo Won Lee, Muhammad Fahad Bhopal, Soo Hong Lee
Korean J. Met. Mater.
2018;56(5):400-405. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.400
Abstract
Aluminum-induced crystallization(AIC) is one of the ways to improve characteristics of thin-film poly-crystalline (TFPC) silicon solar cell since it shows large grain size and good properties for TFPC silicon solar cell. In AIC process, aluminum is firstly deposited on foreign substrate. Then, silicon is deposited on aluminum. Annealing was done.....
More
Crossref 1
Development of a Mg-Based Alloy with a Hydrogen-Storage Capacity of 7 wt% by Adding a Polymer CMC via Transformation-Involving Milling
Myoung Youp Song, Eunho Choi, Young Jun Kwak
Korean J. Met. Mater.
2018;56(5):392-399. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.392
Abstract
The addition of CMC (Carboxymethylcellulose, Sodium Salt) may improve the hydriding and dehydriding properties of Mg since it has a relatively low melting point and the melting of CMC during transformation-involving milling may put the milled samples in good states to absorb and release hydrogen rapidly. Samples with compositions of.....
More
Crossref 6
Modification of the Amount of CH
4
Supplied for the Efficient CH
4
Reduction of SnO
2
Taeyang Han, Youhan Sohn, Hyunwoo Ha, Mi Yoo, Sangyeol Kim, Sang-ro Lee, Hyun You Kim, Jun Hyun Han
Korean J. Met. Mater.
2018;56(5):384-391. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.384
Abstract
The methane reduction (MR) of SnO
2
has been proposed as a highly efficient method for recovering Sn from SnO
2
containing industrial wastes. The MR of SnO
2
also produces a mixture of H
2
and CO, which can be further utilized as a syngas for the production of various fuels through the.....
More
Crossref 2
Effect of Sn Content on Filler and Bonding Characteristics of Active Metal Brazed Cu/Al
2
O
3
Joint
Jioh Shin, Ashutosh Sharma, Do-hyun Jung, Jae Pil Jung
Korean J. Met. Mater.
2018;56(5):366-374. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.366
Abstract
This study examined the effects of the Sn content in a pure active metal filler Ag-Cu-Ti for the brazing of a Cu/ Al
2
O
3
joint. The optimal content of Sn to effectively wet alumina was 5 wt%. The microstructure of the brazed joint showed the presence of an Ag-rich matrix and.....
More
Crossref 13
High-temperature Oxidation of Hot-dip Aluminized 2.25Cr-1Mo Steel
Muhammad Ali Abro, Junhee Hahn, Dong Bok Lee
Korean J. Met. Mater.
2018;56(5):350-359. Published online 2018 May 8
DOI:
https://doi.org/10.3365/KJMM.2018.56.5.350
Abstract
When 2.25Cr-1Mo steel was hot-dip aluminized, a coating consisting of (Al-rich topcoat)/(Al
13
Fe
4
layer)/(Al
5
Fe
2
layer) formed. With increment of oxidation temperature, the transform of Al→Al
13
Fe
4
→Al
5
Fe
2
→AlFe→AlFe
3
→α-Fe(Al)→α-Fe occurred through interdiffusion between the coating and the substrate as follows. The oxidation at 700
o
C changed the coating to (α-Al
2
O
3
scale)/(α-Al
2
O
3
, Al
13
Fe
4
, Al
5
Fe
2
)-mixed layer)/(Al
5
Fe
2
layer)/(AlFe.....
More
Crossref 2
Enhanced Electrical Properties and Stability of Solution-processed Amorphous Oxide Thin Film Transistors with Multi-active Layers
Won Seok Choi, Byung Jun Jung, Myoung Seok Kwon
Korean J. Met. Mater.
2018;56(4):304-312. Published online 2018 Apr 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.4.304
Abstract
We investigated the electrical properties and gate bias stress stability of solution-processed amorphous oxide thin film transistors (TFTs) with multi-stacked active layers. With the multi-layered InZnO (In:Zn = 1:1), mobility was increased from 4.6 to 21.2 cm
2
V
-1
s
-1
and the subthreshold swing (SS) was improved from 0.71 to 0.54 V/decade compared.....
More
High-temperature Corrosion of CrAlSiN Thin Films in N
2
/0.1%H2S Gas
Muhammad Ali Abro, Junhee Hahn, Dong Bok Lee
Korean J. Met. Mater.
2018;56(4):272-279. Published online 2018 Apr 5
DOI:
https://doi.org/10.3365/KJMM.2018.56.4.272
Abstract
Cr
25.2
Al
19.5
Si
4.7
N
50.5
thin films were deposited on steel substrates by cathodic arc plasma deposition. They consisted of alternating
fcc
-Cr(Al)N/hcp-Al(Cr,Si)N nanolayers. They were corroded at 900 and 1000
o
C for 5-100 h in N
2
/0.1%H
2
S gas atmosphere. Their corrosion mechanism, the structure of the formed scales, and the role of film-constituting elements during.....
More
Comparison of the Hydrogen Release Properties of Zn(BH
4
)
2-
Added MgH
2
Alloy and Zn(BH
4
)
2
and Ni-Added MgH
2
Alloy
Myoung Youp Song, Young Jun Kwak
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.....
More
Crossref 1
Bridge Burst Characteristics of Aluminum and Copper Thin-Film Bridges in Electrical Initiation Devices
Kyoungjin Kim, Kyu-Hyoung Kim, Seung-gyo Jang
Korean J. Met. Mater.
2018;56(3):235-243. Published online 2018 Mar 6
DOI:
https://doi.org/10.3365/KJMM.2018.56.3.235
Abstract
The optimal design of electrical initiation devices for explosive charges and other high energy materials critically depends on the bridge burst or the electrical explosion of the thin-film metallic bridges. It is therefore quite important to select the right material with suitable explosion properties for the metallic bridge film. However,.....
More
Crossref 1
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