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Machine Learning Guided Prediction of Superhard Materials Based on Compositional Features
머신러닝을 이용한 화합물 조성기반 초경질 소재 특성 예측
Chunghee Nam
남충희
Korean J. Met. Mater. 2022;60(8):619-627.   Published online 2022 Jul 12
DOI: https://doi.org/10.3365/KJMM.2022.60.8.619

Abstract
In this study, the mechanical properties of materials were predicted using machine learning to search for superhard materials. Based on an AFOW database consisting of DFT quantum calculation values, the mechanical properties of materials were predicted using various machine learning models. For supervised learning, the entire data was divided into..... More

                        
ZnO Nanocrystals with Hexagonal Disk Shape Grown by Thermal Evaporation Method in Air at Atmospheric Pressure
대기압의 공기 분위기에서 열증발법에 의해 성장한 육각형 디스크 형상의 ZnO 나노결정
Geun-Hyoung Lee
이근형
Korean J. Met. Mater. 2022;60(8):601-606.   Published online 2022 Jul 12
DOI: https://doi.org/10.3365/KJMM.2022.60.8.601

Abstract
Hexagonal-shaped ZnO nanodisks were synthesized at temperatures above 1000oC via thermal evaporation of a mixture of ZnO, SnO, and graphite powders as the source materials. Notably, the ZnO nanodisks were easily formed in ambient air at atmospheric pressure. The ZnO nanodisks could not be obtained without SnO in the source..... More

                        
Thermoelectric Performance of Sn and Bi Double-Doped Permingeatite
Hee-Jae Ahn, Il-Ho Kim
Korean J. Met. Mater. 2022;60(8):593-600.   Published online 2022 Jul 12
DOI: https://doi.org/10.3365/KJMM.2022.60.8.593

Abstract
In this study, mechanical alloying was performed to synthesize permingeatite Cu3Sb1-x-ySnxBiySe4 (0.02 ≤ x ≤ 0.06 and 0.02 ≤ y ≤ 0.04) doped with Sn and Bi. Hot pressing was subsequently conducted to achieve dense sintered bodies. When the Bi content was constant, the carrier concentration increased with the Sn..... More

                        
A Study on Reduced Graphene Oxide in Large-area Transparent Heaters for Defrosting
성에 제거용 대면적 투명 히터를 위한 환원된 산화 그래핀 연구
Seung Geun Jo, Hae-In Moon, Young Won Kim, Hwan Soo Dow, Jung Woo Lee
조승근, 문해인, 김영원, 도환수, 이정우
Korean J. Met. Mater. 2022;60(8):570-576.   Published online 2022 Jul 12
DOI: https://doi.org/10.3365/KJMM.2022.60.8.570

Abstract
Transparent heaters are promising devices because of their versatile applications in vehicles, smart windows, and sensors, etc. Indium tin oxide is widely used for transparent heater materials due to its high electronic conductivity and visible light transmittance. However, the cost of indium is too high, and its fabrication needs sophisticated..... More

                        
Effect of Ethylene Glycol on the Dissolution of Palladium with HCl Solution Containing Oxidizing Agents and Selective Precipitation of Pd(IV) Compound
Viet Nhan Hoa Nguyen, Si Jeong Song, Man Seung Lee
Korean J. Met. Mater. 2022;60(7):502-510.   Published online 2022 Jun 3
DOI: https://doi.org/10.3365/KJMM.2022.60.7.502

Abstract
There is growing interest in the recovery of pure palladium (Pd) compound from cemented Pd from spent electroplating solutions due to increasing demand for Pd, and there is considerable motivation to develop an efficient recovery process. In conventional methods of leaching Pd metal, HCl solutions containing oxidizing agents are employed...... More

                        
Effect of Sn addition on the Microstructure and Frictionwear Properties of a Nodular Graphite Cast Iron
Won-Sang Shin, Seungwoo Baek, Yoon-Jun Kim
Korean J. Met. Mater. 2022;60(6):471-477.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.471

Abstract
Nodular graphite cast iron is used in the railway and automobile industries because of its excellent workability, abrasion resistance, mechanical strength, and hardenability. To use nodular graphite cast iron in harsh environments, it is essential to examine their friction–wear properties in conjunction with the surface hardness of the materials. Therefore,..... More

                        
Synthesis of N-type Bi<sub>2</sub>Te<sub>2.7</sub>Se<sub>0.3</sub> Compounds through Oxide-Reduction Process and Related Thermoelectric Transport Properties
산화물 환원공정에 의한 n형 Bi2Te2.7Se0.3 화합물의 합성과 열전특성
Young Soo Lim, Bae Gun Park, Gil-Geun Lee
임영수, 박배건, 이길근
Korean J. Met. Mater. 2022;60(6):463-470.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.463

Abstract
We present a study on the synthesis of Bi2Te2.7Se0.3 powders through an oxide reduction process and also on the effect of the oxide reduction process on the thermoelectric transport properties of the resulting Bi2Te2.7Se0.3 compounds. Starting materials of Bi2O3, TeO2 and SeO2 were mechanical milled for homogeneous mixing, and then..... More

                        
Skinnerite Cu<sub>3</sub>SbS<sub>3</sub>: Solid-State Synthesis and Thermoelectric Properties
Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2022;60(6):455-462.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.455

Abstract
Skinnerite Cu3SbS3, which consists of non-toxic and low-cost elements, is a potential thermoelectric material, however, studies on its thermoelectric properties are limited. In this study, the optimal conditions of mechanical alloying (MA) and hot pressing (HP) for the synthesis of the Cu3SbS3 phase were investigated, and its thermoelectric properties were..... More

                        
Preparation and Thermoelectric Properties of Si-Doped Tetrahedrites Cu<sub>12</sub>Sb<sub>4-y</sub>Si<sub>y</sub>S<sub>13</sub>
Min-Cheol Kwon, Il-Ho Kim
Korean J. Met. Mater. 2022;60(6):440-447.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.440

Abstract
Si-doped Cu12Sb4-ySiyS13 (y = 0.1-0.4) compounds were prepared using solid-state synthesis. Each specimen consisted of a single tetrahedrite phase with a densely sintered body whose relative density exceeded 98.9%. The lattice constant decreased from 1.0357 nm to 1.0336 nm as the Si content increased. When the Si doping content (y)..... More

                        
Process Optimization for Dual Laser Beam Joining for Dissimilar Plastics
Suwon Kim, PilGong Choi, Soo Jin Choi, Sang Bae Han, Jiyeon Choi, Jeng O Kim, Hyonkee Sohn, Sanghoon Ahn, Jiwhan Noh, Heeshin Kang, Kwangyun Jung, Dohyun Kim, Hyun-Deok Kim, Changkyoo Park
Korean J. Met. Mater. 2022;60(6):432-439.   Published online 2022 May 24
DOI: https://doi.org/10.3365/KJMM.2022.60.6.432

Abstract
A dual laser beam joining process is introduced for joining dissimilar plastics. A customized laser head was built, and two different diode lasers with central wavelengths of 980 and 1940 nm were simultaneously applied to obtain PMMA/PC-1 and PC-2/ABS joints. Various experimental conditions were employed for the dual laser beam..... More

                        
Corrosion Characteristics of Bronze Artifacts Excavated from the Songguk-ri site in Buyeo According to Alloy Ratio and Manufacturing Techniques During the Goryeo Dynasty
부여 송국리 유적 출토 고려시대 청동유물의 합금성분 및 제작기법에 따른 부식 특성
Jun Hyuk Jang, Kwang Yong Chung
장준혁, 정광용
Korean J. Met. Mater. 2022;60(5):400-408.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.400

Abstract
A comprehensive analysis of the corrosion characteristics of excavated bronze artifacts was conducted according to their alloy ratio and microstructure. Corroded by various factors, which resulted in different corrosion characteristics. Among these, corrosion may occur in the excavated bronze due to the difference in the alloy ratio, which is an..... More

                        
Optimization of Two-Stage Hybrid Forming Process via Quantitative Assessment of Mechanical Properties in AA5052
Sang Soo Lee, Seon Du Choi, Ho Geun Shin, Suman Timilsina, Seong Min Jang, Young Seon Lee, YongNam Kwon, Ji Sik Kim
Korean J. Met. Mater. 2022;60(5):391-399.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.391

Abstract
Superplastic forming (SPF) is a promising approach used for manufacturing parts with complex geometries, especially in the automotive, aerospace, and marine industries. However, the wider use of this method is limited by issues of low forming rate, high-temperature requirement, non-uniform thickness distribution, and expensive base materials. The two-stage hybrid forming..... More

                        
Solid-State Synthesis and Thermoelectric Properties of Ge-Doped Tetrahedrites Cu<sub>12</sub>Sb<sub>4-y</sub>Ge<sub>y</sub>S<sub>13</sub>
Se-In Jeong, Il-Ho Kim
Korean J. Met. Mater. 2022;60(5):376-383.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.376

Abstract
Ge-doped tetrahedrites Cu12Sb4-yGeyS13 (y = 0.1–0.4) were prepared using mechanical alloying and hot pressing. An X-ray diffraction analysis after mechanical alloying showed a single tetrahedrite phase without secondary phases. The tetrahedrite phase was stable after hot pressing at 723 K under 70 MPa. As the Ge content increased, the lattice..... More

                        
Effect of EMS Process on the Primary Si Refinement, Tensile and Fatigue Properties of Hyper-eutectic Al-15wt.%Si Alloy
과공정 Al-15wt.%Si 합금의 Primary Si 미세화와 인장 및 피로 특성에 미치는 EMS 공정의 영향
Min-Seok Baek, Tae-Hoon Kang, Jong-Ho Kim, Jun-Pyo Park, Kwangjun Euh, Kee-Ahn Lee
백민석, 강태훈, 김종호, 박준표, 어광준, 이기안
Korean J. Met. Mater. 2022;60(5):360-369.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.360

Abstract
This study investigated the effect of the electromagnetic stirring (EMS) process on the microstructure and mechanical properties of hyper-eutectic Al-15 wt.%Si alloy. The tensile and high-cycle fatigue properties of the EMS Al-15wt.%Si alloy were examined and compared with conventional direct chill (DC) cast alloy. The initial microstructure of the as-cast..... More

                        
Effect of Cu on the Microstructure of Al-8Zn-2.5Mg-xCu Alloys Fabricated by Twin roll casting
박판주조법으로 제조한 Al-8Zn-2.5Mg-xCu 합금 판재의 미세조직에 미치는 Cu의 영향
Dong-Guk Kim, Yong hee Jo, Yun-Soo Lee, Yong-You Kim, Hyoung-Wook Kim, Jung-Ki Kim
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..... More

                        
Hydration Deformation Behaviors of Scaffolds of Tricalcium Silicate/Tricalcium Aluminate Mixtures Printed Using the Fused Deposition Modelling (FDM)
Yeongjin Koo, Myung-Hyun Lee, Seog Young Yoon, Yoonjoo Lee
구영진, 이명현, 윤석영, 이윤주
Korean J. Met. Mater. 2022;60(4):321-328.   Published online 2022 Mar 28
DOI: https://doi.org/10.3365/KJMM.2022.60.4.321

Abstract
3D printing technology has advanced rapidly over the last decade. However, for ceramic materials, drying and sintering steps are required after printing, and excessive shrinkage that occurs during these steps is a major factor that has hindered the development of the ceramic 3D printing technology. In this study, a non-sintering..... More

                        
Enhanced Electrical Performance and Bias Stability of a-IGZO Thin-Film Transistor by Ultrasonicated Pre-annealing
초음파 전열처리를 이용한 a-IGZO 트랜지스터의 향상된 전기적 성능과 바이어스 안정성
Jae-Yun Lee, Suchang Yoo, Han-Lin Zhao, Seong-Gon Choi, Heung Gyoon Ryu, Yong Jin Jeong, Sung-Jin Kim
이재윤, 유수창, 조한림, 최성곤, 유흥균, 정용진, 김성진
Korean J. Met. Mater. 2022;60(4):307-314.   Published online 2022 Mar 28
DOI: https://doi.org/10.3365/KJMM.2022.60.4.307

Abstract
Vacuum-processed oxide semiconductors have enabled incredible recent advances in the scientific research of metal oxide thin-film transistors (TFTs) and their introduction in commercial displays. Developing metal oxide transistors with low processing temperatures, on the other hand, remains a challenge. Metal oxide transistors are commonly produced at high processing temperatures (over..... More

                        
A Study on Ceramic Heater Devices Based on Si<sub>3</sub>N<sub>4</sub> with a MoO<sub>3</sub> Protective Layer
MoO3 보호막 적층 Si3N4 기반 세라믹 히터 소자 연구
Yong Min Jeon, Si Hong Ryu, Seon Ho Kim, Seong Eui Lee
전용민, 유시홍, 김선호, 이성의
Korean J. Met. Mater. 2022;60(4):301-306.   Published online 2022 Mar 28
DOI: https://doi.org/10.3365/KJMM.2022.60.4.301

Abstract
Currently, the need for high performance heaters for industrial application is increasing, and repeated wear, rapid temperature change, and uneven temperature can cause deteriorating quality and reduced productivity. The ceramic heater in this study consists of a substrate, an electrode layer, and a protective layer, and low-melting temperature glass frit..... More

                        
Recovery of High-Purity Lithium Compounds from the Dust of the Smelting Reduction Process for Spent Lithium-Ion Batteries
Thanh Tuan Tran, Seong Ho Son, Man Seung Lee
손성호, 이만승
Korean J. Met. Mater. 2022;60(4):291-300.   Published online 2022 Mar 28
DOI: https://doi.org/10.3365/KJMM.2022.60.4.291

Abstract
The recovery of valuable metals such as cobalt, nickel, and lithium from spent lithium-ion batteries (LIBs) has attracted much attention. In this study, a hydrometallurgical process for the recovery of high-purity lithium compounds like Li2CO3 and Li3PO4 from dust containing Li, Co, Ni, Cu, Fe, Mn, and Si produced during..... More

                        
Microstructure and Mechanical Properties of Vacuum Centrifugal Casted Ti-6Al-4V Alloy by Casting and Heat Treatment
진공 원심 주조된 Ti-6Al-4V 합금의 주조 및 열처리에 따른 미세조직과 기계적 특성
Hyun-Woo Lee, Byeong-Ook Kong, Seung Eon Kim, Yunkon Joo, Sukhyun Yoon, Je Hyun Lee
이현우, 공병욱, 김승언, 주윤곤, 윤석현, 이재현
Korean J. Met. Mater. 2022;60(4):282-290.   Published online 2022 Mar 28
DOI: https://doi.org/10.3365/KJMM.2022.60.4.282

Abstract
The Ti-6Al-4V alloy has been widely used for structural materials due to high specific strength property, however it is difficult to cast because of high reactivity at high temperature. In this study casting characteristics and post-casting heat treatment were studied in the cast Ti alloy. The cast alloy was prepared..... More

                           Cited By 1
A Study on Graphene Structure Control Using Ammonia Gas for a Highly Sensitive Pressure Sensor
암모니아를 이용한 그래핀 구조 제어 및 고감도 압력 센서로의 적용
Yeon Wook Jung, Seung Geun Jo, Hae-In Moon, Young Won Kim, Yujin Shin, Gil-Ryeong Park, Jung Woo Lee
정연욱, 조승근, 문해인, 김영원, 신유진, 박길령, 이정우
Korean J. Met. Mater. 2022;60(3):206-212.   Published online 2022 Feb 8
DOI: https://doi.org/10.3365/KJMM.2022.60.3.206

Abstract
Graphene has been used in various fields because of its excellent mechanical, optical, electrical, and thermal properties. However, its intrinsic low sensitivity to pressure limits its sensor applications. To overcome this drawback, many researchers have tried to improve the sensitivity by controlling the defects on the graphene, but have yet..... More

                           Cited By 1
Comparison of Phase Evolution and Sintering Properties of Ti-10Mo Alloys Prepared using Bulk Scrap and Blended Elemental (BE) Powder
In-Hyeok Choi, Jung-Min Oh, Daeyoung Kim, Jong-Woong Kim, Hanjung Kwon
Korean J. Met. Mater. 2022;60(3):180-187.   Published online 2022 Feb 8
DOI: https://doi.org/10.3365/KJMM.2022.60.3.180

Abstract
In this study, Ti-10Mo alloy powder and sintered bodies were successfully fabricated using a threestep process of acid/organic solvent cleaning, hydrogenation/dehydrogenation (HDH) of bulk Ti-Mo scrap, and pressureless vacuum sintering of the alloy powder. This process can be used to recycle valuable Ti alloy. And unlike remelting-based recycling processes, in..... More

                        
Effect of UV Irradiation on Optical Properties of Water-Based Synthetic Zinc Selenide Quantum Dots
자외선 조사가 수계 용매에서 합성된 셀렌화 아연 양자점의 광학특성에 미치는 영향
Geum Ji Back, Yu Jin Kang, I Ju Kang, Jeong Hyeon Lim, Hyun Seon Hong
백금지, 강유진, 강이주, 임정현, 홍현선
Korean J. Met. Mater. 2022;60(2):160-167.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.160

Abstract
ZnSe quantum-dots were synthesized in an aqueous system and UV irradiation was introduced as a post-treatment process. The synthesis temperature was varied from 25 oC to 90 oC, and the surface of the nano powder was stabilized using different ligands such as glutathione (GSH), 3-mercaptopropionic acid (MPA) and thioglycolic acid..... More

                        
Effect of Precipitates and Cold Working on the Reheat Cracking of STS 347 Austenitic Stainless Steel
STS 347 오스테나이트계 스테인리스강의 재열균열에 미치는 석출물과 냉간 가공의 영향
Il Yoo, Seok-Woo Ko, Jaeyun Kim, Byoungchul Hwang
유일, 고석우, 김재윤, 황병철
Korean J. Met. Mater. 2022;60(2):102-113.   Published online 2022 Jan 12
DOI: https://doi.org/10.3365/KJMM.2022.60.2.102

Abstract
The aim of this study was to investigate the effect of precipitates and cold working on the reheat cracking of STS 347 austenitic stainless steel. Three different heat treatments to form NbC and M23C6 precipitates were applied to the STS 347 austenitic stainless steel and 10% pre-strain was additionally introduced..... More

                        
Effect of Dissolution of Precipitates on Mechanical Properties of A7075-T6 Alloy
A7075-T6 합금에서 η' 석출상의 재고용이 기계적 특성에 미치는 영향
Young-We Kim, Yong-Hee Jo, Yun-Soo Lee, Hyoung-Wook Kim, Je-In Lee
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 oC or higher, elongation significantly increased and dissolution of the η′ phase occurred. η′ is the main hardening phase. After..... More

                        Supplementary         Cited By 2
A Case Study of Material Selection Method Based on Engineering and Material Perception Applied to the Smartphone Rear Panel
스마트폰 후면에 적용된 엔지니어링 기반 및 재료지각 기반 재료선택방법의 사례연구
Jaeho Choi
최재호
Korean J. Met. Mater. 2022;60(1):76-82.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.76

Abstract
Smartphones were launched in the market as a product in the early 2000’s. Today, less than 20 years later, the smartphone has become one of the most frequently used devices for human contact. The market is saturated, and competition between products has intensified, and it is not difficult to find..... More

                        
Thermal Properties of Copper Matrix-Ceramic Filler Composite Prepared by Polymer Solution Method
Bok-Hyun Oh, Chung-Il Ma, Ji-Yeon Kwak, Heon Kong, Sang-Jin Lee
Korean J. Met. Mater. 2022;60(1):68-75.   Published online 2021 Dec 10
DOI: https://doi.org/10.3365/KJMM.2022.60.1.68

Abstract
A copper (Cu) metal-ceramic filler composite with high thermal conductivity and a suitable thermal expansion coefficient was designed for application as a high-performance heat dissipation material. The purpose of the designed material was to utilize the high thermal conductivity of Cu while lowering its high coefficient of thermal expansion by..... More

                        
The Effect of Preheating Current on the Melting Behavior of Bolt Projection Welding of Al-Si Coated Hot-Stamped Boron Steel
Al-Si 도금된 핫스탬핑 보론강의 볼트 프로젝션 용접시 예열 통전이 용융 거동에 미치는 영향
Jae-Hun Kim, Hyun-Uk Jun, Joo-Yong Cheon, Jae-won Kim, Jae-deuk Kim, Changwook Ji
김재훈, 전현욱, 천주용, 김재원, 김재득, 지창욱
Korean J. Met. Mater. 2021;59(12):893-903.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.893

Abstract
This study evaluated the effect of preheating on early stage melting behavior of a Al-Si coated hot stamped boron steel bolt during projection welding. A large amount of heat was generated in the early stage of projection welding. Because of the large heat generation, a rapid collapse of the projection..... More

                        
Formation of Surface-Wrinkled Metal Nanosheets via Thermally Assisted Nanotransfer Printing
열보조 나노 전사 프린팅을 통한 금속 박막의 표면 주름 나노패턴 형성 방법
Tae Wan Park, Woon Ik Park
박태완, 박운익
Korean J. Met. Mater. 2021;59(12):880-885.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.880

Abstract
Nanopatterning methods for pattern formation of high-resolution nanostructures are essential for the fabrication of various electronic devices, including wearable displays, high-performance semiconductor devices, and smart biosensor systems. Among advanced nanopatterning methods, nanotransfer printing (nTP) has attracted considerable attention due to its process simplicity, low cost, and great pattern resolution. However,..... More

                        
Microstructure and Wear Properties of Al 7075 Alloy Manufactured by Twin-Roll Strip Casting Process
Twin-Roll Strip Casting 공정으로 제조된 Al 7075 합금의 미세조직 및 마모 특성
Kyoung-Wook Kim, Min-Seok Baek, Kwangjun Euh, Kee-Ahn Lee
김경욱, 백민석, 어광준, 이기안
Korean J. Met. Mater. 2021;59(12):870-879.   Published online 2021 Nov 19
DOI: https://doi.org/10.3365/KJMM.2021.59.12.870

Abstract
Al 7075 alloy was manufactured using the twin-roll strip casting (TRC) process, and the mechanical and wear properties of the fabricated TRC process were investigated. To compare the properties of the alloy manufactured by TRC, another Al 7075 alloy was fabricated by conventional direct chill (DC) casting as a comparative..... More

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