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Microstructure and Texture Evolution in Thermomechanically Processed FCC Metals and Alloys: a Review
Aman Gupta, Ranjeet Kumar, Lalit Kaushik, Sourabh Shukla, Vipin Tandon, Shi-Hoon Choi
Korean J. Met. Mater. 2024;62(7):564-592.   Published online 2024 Jun 28
DOI: https://doi.org/10.3365/KJMM.2024.62.7.564

Abstract
The stacking fault energy (SFE) of face-centered cubic (FCC) alloys is a critical parameter that controls microstructural and crystallographic texture evolution during deformation and annealing treatments. This review focuses on several FCC alloys, aluminum (Al), copper (Cu), austenitic stainless steels (ASSs), and high entropy alloys (HEAs), all of which exhibit..... More

                
Skutterudite: Reproducibility of Thermoelectric Performance of P-type RyFe4-xCoxSb12 Bulky Compacts
Jin-Sol Kim, Dong-Kil Shin, Kwan-Ho Park, Il-Ho Kim
Korean J. Met. Mater. 2024;62(7):542-549.   Published online 2024 Jun 28
DOI: https://doi.org/10.3365/KJMM.2024.62.7.542

Abstract
Skutterudite compounds have excellent thermoelectric performance in the intermediate-to high temperature range. Their lattice thermal conductivity can be reduced by intensifying phonon scattering through independent vibrations of the guest atoms, by filling the voids within the lattice. Furthermore, the thermoelectric figure of merit (ZT) can be enhanced by optimizing the..... More

                
Thermoelectric Chalcostibite: Solid-State Synthesis and Thermal Properties
Dong Hwi Kim, Sang Yun, Il-Ho Kim
Korean J. Met. Mater. 2024;62(6):480-486.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.480

Abstract
In this study, thermoelectric chalcostibite (CuSbS2) compounds were fabricated using mechanical alloying (MA) and hot pressing (HP), and phase identification, microstructural observation, and thermal analysis were conducted. The thermal properties were then measured and compared with those of other Cu–Sb–S ternary compounds synthesized by the same solid-state process, namely, skinnerite..... More

                
Polymer-Chain Aggregation-induced Electrical Gating at the H- and J-aggregate P3HT
Byoungnam Park
Korean J. Met. Mater. 2024;62(6):455-463.   Published online 2024 May 31
DOI: https://doi.org/10.3365/KJMM.2024.62.6.455

Abstract
This research explores how aggregation influences the electrical behavior at both the planar - heterojunction poly(3-hexylthiophene) (P3HT)/SiO2 and P3HT/ZnO nanocrystal (NC) interfaces. The formation of H- and J-type aggregates leads to distinct molecular ordering and packing structures, manifesting as changes in threshold voltage shifts (electrical gating) as well as absorption..... More

                
Uniformity of Thermoelectric Properties of N-type Bi2Te3-ySey Bulky Compacts
Se-Hyeon Choi, Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2024;62(5):385-392.   Published online 2024 May 5
DOI: https://doi.org/10.3365/KJMM.2024.62.5.385

Abstract
Because n-type Bi2Te3-based materials exhibit lower thermoelectric performance than p-type materials and because their thermoelectric properties are sensitively changed by the composition and carrier concentration, optimizing these aspects in n-type materials is necessary to improve the thermoelectric figure of merit (ZT). In this study, the thermoelectric performance of n-type Bi2Te3-based..... More

                
Mg-Composition Dependent Cycle Stability in Zn1-xMgxO Li-ion Battery: Transition from Electronic Transport-Limited to Ionic Transport Limited Cycles
Byoungnam Park
Korean J. Met. Mater. 2024;62(5):377-384.   Published online 2024 May 5
DOI: https://doi.org/10.3365/KJMM.2024.62.5.377

Abstract
This study explores Mg-composition dependent cycle stability in a Zn1-xMgxO Li-ion battery, where battery cycles transition from an electronic transport-limited to an ionic transport limited regime. We investigated the impact of Mg doping in Zn1-xMgxO nanocrystals on Li-ion battery performance, focusing on Mg compositions between x=0.05 and x=0.15. Mg composition..... More

                
Thermo-Compression Sinter-Bonding in Air Using Cu Formate/Cu Particles Mixed During Reduction of Cu2O
Woo Lim Choi, Jong-Hyun Lee
Korean J. Met. Mater. 2024;62(5):360-366.   Published online 2024 May 5
DOI: https://doi.org/10.3365/KJMM.2024.62.5.360

Abstract
A Cu-based paste containing Cu formate and Cu particles was prepared for the compressionassisted sinter-bonding of Cu-finished wide-bandgap power devices onto a Cu-finished substrate at a relatively low bonding temperature of 250 oC in air. A mixture of Cu formate and Cu particles was designed to mitigate the tremendous volume..... More

                
Enhancement of Flexural Strength by Slip Casting Cordierite Ceramics with h-BN Nanoparticles
Chul Oh Park, Jong Hyun Lee, Dong Kyun Lee, Hyun Jun Cho, Sung Hwan Yim, Kyu Hyoung Lee
Korean J. Met. Mater. 2024;62(4):306-311.   Published online 2024 Mar 29
DOI: https://doi.org/10.3365/KJMM.2024.62.4.306

Abstract
In this study, we enhanced the flexural strength of cordierite ceramics by incorporating h-BN (hexagonal boron nitride) nanoparticles, facilitated by the slip casting process. Initially, commercial cordierite powder with an average particle size of 10 mm underwent a ball-milling process to reduce the size to 2.5 mm and simultaneously achieve..... More

                
Improvement in the Hydrogen-Storage Properties of Mg2Ni by Adding LiBH4
Young Jun Kwak, Myoung Youp Song, Ki-Tae Lee
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 Mg2Ni, LiBH4 was added by milling in hydrogen atmosphere (reactive mechanical milling, RMM). Mg2Ni-10LiBH4 was prepared with a composition of 90 wt% Mg2Ni + 10 wt% LiBH4. The quantity of released hydrogen (Hr) versus temperature T curve for Mg2Ni10LiBH4 was obtained by heating at..... More

                
Tuning Dielectric Constant of P3HT by Ultrasound-Induced Aggregation
Byoung-Nam Park
Korean J. Met. Mater. 2024;62(4):292-298.   Published online 2024 Mar 29
DOI: https://doi.org/10.3365/KJMM.2024.62.4.292

Abstract
Poly(3-hexylthiophene) (P3HT), a semiconducting polymer, is integral to the development of organic electronic devices. Its optoelectronic properties are significantly influenced by the nature of its intermolecular interactions, predominantly classified as J-type and H-type couplings. This study investigates the effect of sonication on the dielectric properties of P3HT, focusing on the..... More

                
Surfactant Composition Dependent Evolution of Electronic/Structural Properties of P3HT Nanoparticle Colloids Synthesized via Mini-Emulsion Technique
Byoung-Nam Park
Korean J. Met. Mater. 2024;62(4):284-291.   Published online 2024 Mar 29
DOI: https://doi.org/10.3365/KJMM.2024.62.4.284

Abstract
: This study investigates the influence of surfactant (sodium dodecyl sulfate, SDS) concentration on the size and optoelectronic properties of poly(3-hexylthiophene) (P3HT) nanoparticles (NPs) synthesized via the mini-emulsion technique. P3HT NPs were fabricated with varying SDS concentrations. The size dependent optoelectronic properties, including the highest occupied molecular orbital (HOMO) and..... More

                
Identification of Solvent Extraction of Au(III) by Cyanex 272 from Hydrochloric Acid Solutions
Thi Nhan Hau Nguyen, Man Seung Lee
Korean J. Met. Mater. 2024;62(3):204-211.   Published online 2024 Feb 28
DOI: https://doi.org/10.3365/KJMM.2024.62.3.204

Abstract
Bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex 272) is known to selectively extract Au(III) from dilute to concentrated hydrochloric acid solutions. Therefore, Cyanex 272 can be employed in the separation of Au(III) from the hydrochloric acid leaching solutions of secondary resources containing gold metal. This work identified the extraction reaction of Au(III) by Cyanex..... More

                
Modulating the Electrical Properties of Lithium-Doped Zinc Oxide: Interplay of Lithium Content, Oxygen Pressure, and Temperature
Byoungnam Park
Korean J. Met. Mater. 2024;62(2):106-114.   Published online 2024 Jan 30
DOI: https://doi.org/10.3365/KJMM.2024.62.2.106

Abstract
This research elucidates the intricate interplay of lithium content, oxygen pressure, and temperature and their influence on the electrical properties of Lithium-doped zinc oxide (LZO). The electrical behavior of zinc oxide (ZnO), a prominent semiconductor material, can be modulated when doped with lithium (Li). Through systematic experimentation, we demonstrate that..... More

                
Thermomechanical Behavior and Microstructure Properties of Carbon Fiber Reinforced Polymer at Elevated Temperatures
Okmin Park, Seulgi Han, Sanghyun Park, Jamil Ur Rahman, Sang-il Kim, Sungmo Choi
Korean J. Met. Mater. 2024;62(1):57-64.   Published online 2023 Dec 29
DOI: https://doi.org/10.3365/KJMM.2024.62.1.57

Abstract
Carbon fiber reinforced polymer (CFRP) has been extensively used in civil engineering for applications such as reinforcing and retrofitting various architectural materials. Therefore, understanding the degradation of CFRP under high temperatures is important. This study aims to investigate the thermomechanical and microstructural properties of CFRP plates at elevated temperatures up..... More

                
Changes in Microstructure, Mechanical and Electrical Properties with Progress of Cold Wire-Drawing for AA1070
Sang-Hyeon Jo, Seong-Hee Lee
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..... More

                
Thermoelectric Transport Properties of Sb-doped SnSe2 Polycrystalline Alloys
Seung Min Kang, Jong Wook Rho, Hyungyu Cho, Sanghyun Park, Joontae Park, Sang-il Kim
Korean J. Met. Mater. 2023;61(11):842-848.   Published online 2023 Oct 29
DOI: https://doi.org/10.3365/KJMM.2023.61.11.842

Abstract
SnSe2 alloys have been investigated in recent times as potential n-type thermoelectric materials. In this study, the thermoelectric transport properties of a series of Sb-doped SnSe2, Sn(Se1-xSbx)2 (x = 0, 0.015, 0.03, 0.045, 0.06) alloys are investigated. The electrical conductivity was generally enhanced with Sb doping owing to a large..... More

                   Web of Science 1  Crossref 1
A Study on the Microstructure, Tensile and Fatigue Properties of Martensitic Stainless Steel Plate
Hyojoo Lee, Sam Yaw Anaman, Nam-Su Rho, Si-Hyun Sung, Hyun-Min Sung, Sang-Yeob Lee, Hoon-Hwe Cho
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..... More

                
Influence of Elevated Temperature on the Mechanical and Microstructural Properties of Glass Fiber-Reinforced Polymers
Se Woong Lee, Seulgi Han, Okmin Park, Sang-il Kim, Sungmo Choi
Korean J. Met. Mater. 2023;61(10):800-806.   Published online 2023 Sep 25
DOI: https://doi.org/10.3365/KJMM.2023.61.10.800

Abstract
Glass fiber-reinforced polymers (GFRPs) have attracted significant attention as structural materials because of their high fatigue resistance, corrosion resistance, strength, and stiffness. This study examined the effect of elevated temperatures (150, 250, 350, and 450oC) on the microstructural and mechanical properties of GFRP plates. The number of bubbles increased as..... More

                   Web of Science 2  Crossref 2
Development of Wet Chemical Analysis Technique for Tramp Elements (M = As, Pb, Sb, and Sn) in Silver-M Alloys
Won-Bum Park, Yong-Woo Kim, Sun-Joong Kim, Youn-Bae Kang
Korean J. Met. Mater. 2023;61(9):694-703.   Published online 2023 Aug 30
DOI: https://doi.org/10.3365/KJMM.2023.61.9.694

Abstract
Wet chemical analysis techniques for four elements (M = As, Pb, Sb, and Sn) in Ag – M binary alloys were investigated with emphasis on the choice of solvent acid and the characteristic wavelength used in the ICP-AES (Inductively-Coupled Plasma Atomic Emission Spectrometer) analysis. The elements are representative tramp elements..... More

                   Web of Science 1  Crossref 1
Effects of Stacking Number on Microstructure and Mechanical Properties for Cold Roll Bonding Process of Dissimilar Aluminum Alloy Sheets
Seong-Hee Lee
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..... More

                   Web of Science 5  Crossref 5
Electrochemical Characteristics of Elastic, Non-Polar Polyurethane-Based Polymer Gel Electrolyte for Separator-Less Lithium-Ion Batteries
Alloyssius E.G. Gorospe, Dongwoo Kang, Dongwook Lee
Korean J. Met. Mater. 2023;61(8):616-624.   Published online 2023 Jul 20
DOI: https://doi.org/10.3365/KJMM.2023.61.8.616

Abstract
Lithium-ion batteries (LIBs) have undergone countless enhancements in the past decade, mainly improvements in the basic components: electrodes, electrolyte, and separator. The separator, which acts as a physical barrier between the two electrodes, does not directly participate in the charge and energy storage. However, it is involved in the safety, form..... More

                   Web of Science 1  Crossref 1
Transition Metal Dichalcogenide WS2 Films Prepared with a Combination of Spin/Dip Coating and CVD
Woon-Seop Choi
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 WS2 via solution-process is rare due to the higher temperature..... More

                
Microstructural Evolutions and Strengthening Mechanism according to the Aging Temperatures of a High Si Cast Aluminum Alloy
Won-Sang Shin, Yoon-Jun Kim
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..... More

                   Web of Science 1  Crossref 1
Effects of Double Doping Germanium and Indium on the Thermoelectric Properties of Permingeatite
Bong-Ki Hong, Il-Ho Kim
Korean J. Met. Mater. 2023;61(7):489-499.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.489

Abstract
Cu3Sb1–x–yGexInySe4 (0.02 ≤ x ≤ 0.12; 0.04 ≤ y ≤ 0.08) permingeatite compounds doped with Ge and In were prepared using solid-state synthesis. The phases and microstructures were analyzed, and the charge transport and thermoelectric properties were evaluated according to the Ge and In doping content. Most of the samples..... More

                
Spheroidization Heat Treatment Conditions with Data Analysis in Medium Carbon Cr-Mo Steel for Ultra High Strength Cold Heading
Yong Deok Jo, Hui Ju Lee, Sung Yi, Byoung Lok Jang
Korean J. Met. Mater. 2023;61(7):459-471.   Published online 2023 Jun 21
DOI: https://doi.org/10.3365/KJMM.2023.61.7.459

Abstract
The degree to which parameters affect the spheroidization heat treatment of steel was calculated by setting the spheroidization heat treatment conditions of Cr-Mo steel and using data analysis such as S/N ratio and ANOVA. After analyzing the transformation temperatures of the steel, Ac1 and Ac3 , using a DSC, the..... More

                
Enhanced Thermoelectric Transport Properties in Cu-added Bi2Se3 Polycrystalline Alloys
Hyungyu Cho, TaeWan Kim, Seung Min Kang, Sanghyun Park, Sang-il Kim
Korean J. Met. Mater. 2023;61(6):431-436.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.431

Abstract
The addition of Cu to layered Bi2Te3-based thermoelectric alloys has been studied as an effective way to enhance thermoelectric transport properties. In this study, the influence of adding Cu to Bi2Se3 alloys, which have the same rhombohedral crystal structure as Bi2Te3, was investigated by synthesizing a series of CuxBi2Se3 (x..... More

                   Web of Science 1  Crossref 1
Improved Thermoelectric Performance of Cu3Sb1−x−ySnxInySe4 Permingeatites Double-Doped with Sn and In
Ho-Jeong Kim, Il-Ho Kim
Korean J. Met. Mater. 2023;61(6):422-430.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.422

Abstract
Cu–Sb–Se ternary chalcogenide compounds composed of earth-abundant low-toxicity elements are attracting attention as economical and ecofriendly semiconductors. Among them, permingeatite (Cu3SbSe4) is a potential thermoelectric material with high Seebeck coefficient and low lattice thermal conductivity. However, it is necessary to improve its thermoelectric properties through doping, as it has low..... More

                
Gadolinium-Doped CeO2 Gas Sensor for H2S Sensing
Changhyun Jin, Sangwoo Kim, Dong Eung Kim, Ali Mirzaei, Jong Wook Roh, Sun-Woo Choi, Myung Sik Choi
Korean J. Met. Mater. 2023;61(6):414-421.   Published online 2023 May 18
DOI: https://doi.org/10.3365/KJMM.2023.61.6.414

Abstract
Dihydrogen sulfide (H2S) gas has a flammable nature and is one of the most toxic and dangerous gases. Even small concentrations can be fatal to humans. Herein, we investigated the H2S gas-sensing features of commercial pristine cerium oxide (CeO2 ) and gadolinium (Gd)-doped CeO2 (GDC) nanoparticles. First, the sensing materials..... More

                   Web of Science 1  Crossref 2
Bytizite Cu3SbSe3: Solid-State Synthesis and Thermoelectric Performance
Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2023;61(5):363-370.   Published online 2023 Apr 20
DOI: https://doi.org/10.3365/KJMM.2023.61.5.363

Abstract
Bytizite (Cu3SbSe3 ) has attracted interest as a promising thermoelectric material because of its ultralow thermal conductivity; however, there are few experimental studies. This study investigated the optimal processing conditions for the synthesis of Cu3SbSe3 using mechanical alloying (MA) and hot pressing (HP). The MA powder exhibited an orthorhombic Cu3SbSe3..... More

                
Effects of Sn and In Double-Doping on the Thermoelectric Performance of Cu3Sb1-x-ySnxInyS4 Famatinites
Sang Yun, Il-Ho Kim
Korean J. Met. Mater. 2023;61(5):355-362.   Published online 2023 Apr 20
DOI: https://doi.org/10.3365/KJMM.2023.61.5.355

Abstract
Famatinite (Cu3SbS4 ) is a promising p-type thermoelectric material because of its low lattice thermal conductivity and high Seebeck coefficient. In this study, famatinite powders, double-doped with Sn (a BIV group element) and In (a BIII group element) to give Cu3Sb1-x-ySnxInyS4 (0.02 ≤ x ≤ 0.12 and 0.06 ≤..... More

                   Web of Science 1  Crossref 2
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