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Glycothermally Synthesized Self-aggregated ZnS Spherical Particles for Methyl Orange Photodecomposition
Sang-Jun Park, Jeong-Hwan Song
Korean J. Met. Mater. 2021;59(10):732-740.   Published online 2021 Sep 6
DOI: https://doi.org/10.3365/KJMM.2021.59.10.732

Abstract
Using ethylene glycol (C2H6O2) as the solvent, ZnS particles were synthesized in high yield at a relatively low temperature of 125 oC via the glycothermal method. We report a facile method for preparing spherical self-aggregated ZnS particles from ZnS nanocrystals, using zinc acetate as the Zn2+ source and thiourea as..... More

                        
Charge Transport and Thermoelectric Properties of Sn-Doped Tetrahedrites Cu12Sb4-ySnyS13
Hee-Jae Ahn, Il-Ho Kim
Korean J. Met. Mater. 2021;59(10):724-731.   Published online 2021 Sep 6
DOI: https://doi.org/10.3365/KJMM.2021.59.10.724

Abstract
In this study, tetrahedrite compounds doped with Sn were prepared by mechanical alloying and hot pressing, and their charge transport and thermoelectric properties were analyzed. X-ray diffraction analysis revealed that both the synthetic powders and sintered bodies were synthesized as a single tetrahedrite phase without secondary phases. Densely sintered specimens..... More

                        
Porous MnO2/ carbon Hybrid Material with Improved Electrochemical Performance
Venugopal Nulu
Korean J. Met. Mater. 2021;59(9):670-676.   Published online 2021 Aug 4
DOI: https://doi.org/10.3365/KJMM.2021.59.9.670

Abstract
In this work, MnO2 nanoparticles were embedded in a carbon matrix as a porous composite, fabricated using a simple chemical route followed by low-temperature annealing, with activated carbon (AC) as the carbon source in the composite preparation. The porous MnO2/carbon structures contained some selective nanoparticles coated with carbon. The structural..... More

                        
Effect of Interfacial Intermetallic Compounds Morphology on Mechanical Properties of Laser Brazing of Aluminum to Steel
Kwang-Hyeon Lee, Su-Jin Lee, In-Duck Park, Kwang-Deok Choi, Chung-Yun Kang, Jeong Suh, Tae-Jin Yoon
Korean J. Met. Mater. 2021;59(9):640-651.   Published online 2021 Aug 4
DOI: https://doi.org/10.3365/KJMM.2021.59.9.640

Abstract
The paper provides experimental details of the welding and specific examples of welding aluminum welding battery cans and conductive tabs for battery pack manufacture. In this study, we provide experimental details of a process for joining dissimilar materials used in sealing battery parts. A laser brazing technique was used for..... More

                        
A Study on the Effects of Surface Energy and Topography on the Adhesive Bonding of Aluminum Alloy
Gilho Kang, Wonjong Choi
Korean J. Met. Mater. 2021;59(8):567-574.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.567

Abstract
The bonding properties of adhesives are mainly affected by surface roughness, topography and chemical adsorption. In this paper, we studied the effects of surface pretreatment of Al 2024-T3 (bare) in terms of surface roughness, topography and surface free energy. Surface pre-treatment included solvent cleaning, FPL etching, PAA and CAA treatment...... More

                        
Electronic Transport and Thermoelectric Properties of Te-Doped Tetrahedrites Cu12Sb4-yTeyS13
Sung-Gyu Kwak, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2021;59(8):560-566.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.560

Abstract
Tetrahedrite is a promising thermoelectric material mainly due to its low thermal conductivity, a consequence of its complicated crystal structure. However, tetrahedrite has a high hole concentration; therefore, optimizing carrier concentration through doping is required to maximize the power factor. In this study, Te-doped tetrahedrites Cu12Sb4-yTeyS13 (0.1 ≤ y ≤..... More

                        
Effect of Low Transformation Temperature Welding Consumable on Microstructure, Mechanical Properties and Residual Stress in Welded Joint of A516 Carbon Steel
Sungki Choi, Junsang Lee, Jae-Yik Lee, Seung-Kyun Kang, Young-Cheon Kim, Seung-Joon Lee, Dongil Kwon
Korean J. Met. Mater. 2021;59(8):524-532.   Published online 2021 Jul 5
DOI: https://doi.org/10.3365/KJMM.2021.59.8.524

Abstract
The microstructure, mechanical properties and residual stress of flux-cored arc welded ASTM A516-70N carbon steel using a Mn-based low-temperature transformation (LTT) welding consumable were investigated. Microstructural analysis with X-ray diffraction, an electron backscattered diffractometer and a field-emission scanning electron microscope showed that the LTT weld metal was made up of..... More

                        
Synthesis of Three-Dimensionally Interconnected Hexagonal Boron Nitride Networked Cu-Ni Composite
Zahid Hussain, Hye-Won Yang, Byung-Sang Choi
Korean J. Met. Mater. 2021;59(7):505-513.   Published online 2021 Jun 16
DOI: https://doi.org/10.3365/KJMM.2021.59.7.505

Abstract
A three-dimensionally interconnected hexagonal boron nitride (3Di-hBN) networked Cu-Ni (3DihBN-Cu-Ni) composite was successfully synthesized in situ using a simple two-step process which involved the compaction of mixed Cu-Ni powders (70 wt.% Cu and 30 wt.% Ni) into a disc followed by metal-organic chemical vapor deposition (MOCVD) at 1000 oC. During..... More

                        
Tellurium-Incorporated Nickel-Cobalt Layered Double Hydroxide and Its Oxygen Evolution Reaction
Jung-Il Lee, Hui Ra Chae, Jeong Ho Ryu
Korean J. Met. Mater. 2021;59(7):491-498.   Published online 2021 Jun 16
DOI: https://doi.org/10.3365/KJMM.2021.59.7.491

Abstract
Transition-metal-based layered double hydroxides (LDHs) have attracted substantial attention as highly efficient oxygen evolution reaction (OER) catalysts because they are earth-abundant, low-cost, and environmentally friendly materials with favorable adsorption/desorption energies for intermittent reactants. However, the application of these LDHs as high-performance electrocatalysts is often hindered by their relatively sluggish electronic..... More

                        Supplementary      
Effects of Ge Doping on the Charge Transport and Thermoelectric Properties of Permingeatites Cu3Sb1−yGeySe4
Ji-Hee Pi, Go-Eun Lee,, Il-Ho Kim
Korean J. Met. Mater. 2021;59(6):422-429.   Published online 2021 May 26
DOI: https://doi.org/10.3365/KJMM.2021.59.6.422

Abstract
Permingeatites Cu3Sb1−yGeySe4 (0 ≤ y ≤ 0.14) were synthesized by mechanical alloying and hot pressing. The charge-transport parameters (Hall coefficient, carrier concentration, mobility, and Lorenz number) and thermoelectric properties (electrical conductivity, Seebeck coefficient, power factor, thermal conductivity, and figure of merit) were examined with respect to the Ge doping level...... More

                        
A Comparative Study of BaTiO3/PDMS Composite Film and a PVDF Nanofiber Mat for Application to Flexible Pressure Sensors
Donghyuck Park, Kwanlae Kim
Korean J. Met. Mater. 2021;59(6):412-421.   Published online 2021 May 26
DOI: https://doi.org/10.3365/KJMM.2021.59.6.412

Abstract
Intensive research has been conducted to develop flexible piezoelectric pressure sensors, since selfpowering devices are advantageous for wearable electronic applications. Recently, two types of piezoelectric devices, ceramic-PDMS composite film and PVDF nanofiber mats, have drawn attention in the research community. Piezoelectric ceramics such as BaTiO3 (BTO) and PZT exhibit outstanding..... More

                        
Correlation between the Microstructure and Mechanical Properties of W-Bearing Ti-6Al-4V Alloys
Godwin Kwame Ahiale, In-Seok Kye, Young Sam Kwon, Yong-Jun Oh
Korean J. Met. Mater. 2021;59(6):357-364.   Published online 2021 May 26
DOI: https://doi.org/10.3365/KJMM.2021.59.6.357

Abstract
W-containing Ti-6Al-4V alloys (W=0, 1, and 5 wt%) were fabricated by the powder injection molding process, and the corresponding effects of tungsten content on the mechanical properties and microstructure of the alloys were investigated. The alloy powders were sintered at 1200 °C and then hot-isostatically-pressed at 900 °C. The fabricated..... More

                        
Ultraviolet Light-Responsive Photorheological Fluid for Sensors and Actuators Realized by Phosphorescence Effects and LSTM RNN
Min Young Cho, Suman Timilsina, Jong Wook Roh, Walter Commerell, Ho Geun Shin, Yong-Nam Kwon, Ji Sik Kim
Korean J. Met. Mater. 2021;59(5):346-353.   Published online 2021 Apr 6
DOI: https://doi.org/10.3365/KJMM.2021.59.5.346

Abstract
A photo-rheological fluid (PRF) is a smart fluid which exhibits different viscosity under UV irradiation. A PRF is comprehensively presented in this work, with particular focus on its responses under UV off/on conditions. The isomeric conversion from SP to MC and vice versa under UV off and on, respectively, showed..... More

                        
Charge Transport and Thermoelectric Properties of Mn-Doped Tetrahedrites Cu12-xMnxSb4S13
Sung-Yoon Kim, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2021;59(5):329-335.   Published online 2021 Apr 6
DOI: https://doi.org/10.3365/KJMM.2021.59.5.329

Abstract
Mn-doped tetrahedrites Cu12-xMnxSb4S13 (0.1 ≤ x ≤ 0.4) were synthesized by mechanical alloying (MA) and sintered by hot pressing (HP). A single tetrahedrite phase was synthesized by MA without post-annealing, and it was stable without any phase changes after HP. The hot-pressed specimens had a relative density higher than 98.6%...... More

                        
Fabrication and Surface Deformation of Boron Nitride Nanotubes by RF Plasma and Ion Beam
Seong Min Hong, Jae Geun Gil
Korean J. Met. Mater. 2021;59(4):268-272.   Published online 2021 Mar 24
DOI: https://doi.org/10.3365/KJMM.2021.59.4.268

Abstract
Boron Nitride Nanotubes (BNNT) are one of the candidate materials for storing hydrogen by physical adsorption. It has been reported that this hydrogen storage capacity increases as the crystallinity of the nanostructures decreases. Here, BNNT was synthesized using an RF plasma torch system, and the surface of the BNNT was..... More

                        
Effects of Charge Compensation on the Thermoelectric Properties of (La1-zCez)0.8Fe4-xCoxSb12 Skutterudites
Kyung-Wook Jang, Ye-Eun Cha, Deok-Yeong Choi, Sunuk Kim, Won-Seon Seo, Kyu Hyoung Lee, Il-Ho Kim
Korean J. Met. Mater. 2021;59(4):239-246.   Published online 2021 Mar 24
DOI: https://doi.org/10.3365/KJMM.2021.59.4.239

Abstract
La/Ce-partially double-filled and Co-charge-compensated (La1−zCez)0.8Fe4−xCoxSb12 skutterudites were synthesized, and their thermoelectric properties were studied by varying the filling ratio and charge compensation. X-ray diffraction analysis revealed that the matrix phase was skutterudite and a secondary phase was determined to the marcasite FeSb2. However, the formation of marcasite could be inhibited..... More

                        
Evaluation of the Mechanical Properties of ZnO Nanorods Treated with Oxygen Plasma using Atomic Force Microscopy
Donghyuck Park, Yijun Yang, Kwanlae Kim
Korean J. Met. Mater. 2021;59(3):209-216.   Published online 2021 Feb 19
DOI: https://doi.org/10.3365/KJMM.2021.59.3.209

Abstract
Zinc oxide (ZnO) simultaneously exhibits semiconducting and piezoelectric properties. ZnO in the form of nanorods has been studied intensively for application in self-powering devices. The power generation in piezoelectric nanogenerators based on ZnO nanorods can be improved via several approaches, including an oxygen plasma treatment. When ZnO nanorods are exposed..... More

                        
Improved Ultraviolet Photoresponse Properties of ZnO Nanorods Grown by Using Hydrothermal Method Applied Rotating Precursor Solution
Dongwan Kim, Jae-Young Leem
Korean J. Met. Mater. 2021;59(3):187-194.   Published online 2021 Feb 19
DOI: https://doi.org/10.3365/KJMM.2021.59.3.187

Abstract
We grew ZnO nanorods (NRs) using a hydrothermal method while rotating the precursor solution, and report the effect of rotation on surface modification, and the optical and ultraviolet (UV) photoresponse properties of the resulting ZnO nanorods. The ZnO NRs grown in the rotating precursor solution at 100 rpm had the..... More

                        
Effective Method for Preparing Low-Oxygen Titanium Ingot by Combined Powder Deoxidation and Vacuum Arc Melting Processes
Jung-Min Oh, Jaeyeol Yang, Jaesik Yoon, Jae-Won Lim
Korean J. Met. Mater. 2021;59(3):149-154.   Published online 2021 Feb 19
DOI: https://doi.org/10.3365/KJMM.2021.59.3.149

Abstract
In this study, an effective method is demonstrated for fabricating titanium sputtering targets, which are used to fabricate thin films in the semiconductor industry. The method is an alternative to the existing electron beam melting (EBM) process under high vacuum. Titanium sputtering targets used in the production of semiconductors must..... More

                        
Fabricating Elastomeric Photomask with Nanosized-Metal Patterns for Near-Field Contact Printing
Sangyoon Paik, Gwangmook Kim, Dongchul Seo, Wooyoung Shim
Korean J. Met. Mater. ;59(2):142-148.   Published online 2021 Jan 27
DOI: https://doi.org/10.3365/KJMM.2021.59.2.142

Abstract
When an elastomeric photomask is used for near-field contact printing, the high deformability of the elastomer mask plate enables gap-free full contact with the substrate, minimizing the effect of diffraction. This image-transfer technique provides sub-50 nm resolution and depth-of-focus-free lithographic capability with cost-efficient equipment. However, the method’s application is limited..... More

                        
Nucleation and Growth-Controlled Morphology Evolution of Cu Nanostructures During High-Pressure Thermal Evaporation
Eunji Lee, Woomi Gwon, Sangwoo Ryu
Korean J. Met. Mater. ;59(2):135-141.   Published online 2021 Jan 27
DOI: https://doi.org/10.3365/KJMM.2021.59.2.135

Abstract
The formation of porous material structures has been widely investigated for the development of high-performance energy materials, catalysts, and chemical sensing devices. Various nanoporous structure fabrication methods are based on wet-chemical processes, which require precise control of the process parameters. Physical vapor deposition such as thermal evaporation utilizes high vacuum..... More

                           Cited By 1
Fluorine-based Inductively Coupled Plasma Etching of α-Ga2O3 Epitaxy Film
Ji Hun Um, Byoung Su Choi, Woo Sik Jang, Sungu Hwang, Dae-Woo Jeon, Jin Kon Kim, Hyun Cho
Korean J. Met. Mater. ;59(2):121-126.   Published online 2021 Jan 27
DOI: https://doi.org/10.3365/KJMM.2021.59.2.121

Abstract
α-Ga2O3 has the largest bandgap (~5.3 eV) among the five polymorphs of Ga2O3 and is a promising candidate for high power electronic and optoelectronic devices. To fabricate various device structures, it is important to establish an effective dry etch process which can provide practical etch rate, smooth surface morphology and..... More

                        
Effect of Ultrasonic Cleaning of Titanium Turning Scraps Immersed in Alkaline Solution and Subsequent Preparation of Ferrotitanium Ingots
Suhwan Yoo, Jikwang Chae, Jung-Min Oh, Jae-Won Lim
Korean J. Met. Mater. ;59(2):113-120.   Published online 2021 Jan 27
DOI: https://doi.org/10.3365/KJMM.2021.59.2.113

Abstract
Ti has excellent properties but is more expensive than other materials due to its high melting point, high reactivity and difficult processability. One way to lower the production cost of Ti products is to recycle Ti scraps. Before recycling Ti scraps, pretreatment to remove contamination is essential. Ti scraps can..... More

                        
A New Fracture Analysis Technique for Charpy Impact Test Using Image Processing
Tae Chang Park, Beom Suk Kim, Ji Hee Son, Yeong Koo Yeo
Korean J. Met. Mater. 2021;59(1):61-66.   Published online 2021 Jan 5
DOI: https://doi.org/10.3365/KJMM.2021.59.1.61

Abstract
The Charpy impact test is used to identify the transition between ductility and brittleness. The percentages of ductile and brittle fractures in steel can be evaluated based on each fracture area, which is presently determined by an analyzer with the naked eye. This method may lead to subjective judgement, and..... More

                        
Effect of Shielding Gases on the Wire Arc Additive Manufacturability of 5 Cr – 4 Mo Tool Steel for Die Casting Mold Making
Jae-Deuk Kim, Jae Won Kim, Joo Yong Cheon, Yang-Do Kim, Changwook Ji
Korean J. Met. Mater. 2020;58(12):852-862.   Published online 2020 Dec 4
DOI: https://doi.org/10.3365/KJMM.2020.58.12.852

Abstract
Generally, molds are fabricated by the machining of massive billets of tool steels, such as AISI4140 or H13, but it has drawbacks, such as a large material loss and long-delivery time. The Wire-Arc Additive Manufacturing (WAAM) process could be an alternative fabrication method. It has the advantages of less material..... More

                           Cited By 1
Microstructure and Mechanical Properties of Ni–Cr–Y2O3 Alloy Sintered Powder Composed of Oxide-Embedded Metallic Particles
Changjae Kim, Jungho Gwak, Jaewon Lim, Minsuk Oh, Jeshin Park
Korean J. Met. Mater. 2020;58(12):843-851.   Published online 2020 Dec 4
DOI: https://doi.org/10.3365/KJMM.2020.58.12.843

Abstract
In this study, oxide (Y2O3)-embedded Ni particles were fabricated via a new process. The process involves the mechanical hydrogenation of Ni–Y alloy into Ni–YH2 and the selective oxidation of Ni–YH2 to Ni–Y2O3. The alloy powders were prepared for sintering by the mechanical alloying of a mixed powder. The powder was..... More

                        
Transforming Carbon Black into Graphene Oxide Quantum Dots by Pulsed Laser Ablation in Ethanol
Jung-Il Lee, Jeong Ho Ryu
Korean J. Met. Mater. 2020;58(11):808-814.   Published online 2020 Oct 21
DOI: https://doi.org/10.3365/KJMM.2020.58.11.808

Abstract
Graphene oxide quantum dots (GOQDs) are nanometer-sized graphene oxide fragments that exhibit unique properties, making them interesting candidates for a range of new applications. Carbon black, one of the commercially available carbon precursors, is produced by the thermal decomposition or incomplete combustion of organic compounds. It is commonly used as..... More

                        
Facile Synthesis of Single-Phase Alpha-Tungsten Nanopowders from Ammonium Paratungstate by RF Induction Thermal Plasma and Thermochemical Reduction
Dongyoon Shin, Hyun-Woo Shim, Basudev Swain, Kyung-Soo Park, Chan-Gi Lee
Korean J. Met. Mater. 2020;58(11):798-807.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.798

Abstract
Facile, economic methods of preparing tungsten (W) nanopowder are critically needed to meet industrial demand. Herein, we report a method of preparing single-phase alpha-W (α-W) nanopowders using ammonium paratungstate (APT) as a starting material and the optimum synthesis conditions. The process involves two stages: i) the radio-frequency (RF) induction thermal..... More

                           Cited By 2
Enhanced Optical and Electrical Properties of Ti Doped In2O3 thin Films Treated by Post-deposition Electron Beam Irradiation
Su-Hyeon Choe, Yun-Je Park, Yu-Sung Kim, Byung-Chul Cha, Sung-Bo Heo, Sungook Yoon, Young-Min Kong, Daeil Kim
Korean J. Met. Mater. 2020;58(11):793-797.   Published online 2020 Oct 15
DOI: https://doi.org/10.3365/KJMM.2020.58.11.793

Abstract
Transparent and conductive Ti doped In2O3 (TIO) films were prepared on slide glass substrate using a radio frequency (RF) magnetron sputter and then subjected to Transparent and conductive Ti doped In2O3 (TIO) films were prepared on a glass slide substrate using radio frequency (RF) magnetron sputter. The film surface was..... More

                        
KIST-NOMAD - a Repository to Manage Large Amounts of Computational Materials Science Data
Samuel Boateng, Kwang Ryeol Lee, Deepika , Haneol Cho, Kyu Hwan Lee, Chansoo Kim
Korean J. Met. Mater. 2020;58(10):728-739.   Published online 2020 Oct 5
DOI: https://doi.org/10.3365/KJMM.2020.58.10.728

Abstract
We introduce the Korea Institute of Science and Technology-Novel Materials Discovery (KISTNOMAD) platform, a materials data repository. We describe its functionality and novel features from an academic viewpoint. It is a data repository designed for computational material science, especially focusing on managing and sharing the results of molecular dynamics simulation..... More

                        
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