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Volume 58(7); Jul 2020
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Research Papers
447 Effects of Thiourea Stripping of 14 Karat White Gold Alloys With the Addition of SDS Surfactant
SDS 계면활성제 첨가에 따른 14 캐럿 백색 금합금의 티오우레아 스트리핑의 효과
Ikgyu Kim, Kwangbae Kim, Ohsung Song
김익규, 김광배, 송오성
Korean J. Met. Mater. 2020;58(7):447-452.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.447

Abstract
A stripping solution with thiourea, iron(III) sulfate, and sodium dodecyl sulfate(SDS) was employed to strip Ni-based 14 karat white gold alloys, and the formation of the NiS byproduct and elimination of passivation were investigated in the presence of 0.0-0.2 g/L SDS. White gold alloy samples with a flat shape were..... More

                        
453 Mechanical Properties and Rapid Sintering of WC-BN-Al Composites
WC-BN-Al복합재료 급속소결 및 기계적 성질
Seong-Eun Kim, Su-Hwan Hong, In-Jin Shon
김성은, 홍수환, 손인진
Korean J. Met. Mater. 2020;58(7):453-458.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.453

Abstract
Tungsten carbides are quite attractive for their superior properties, e.g., high melting point, high hardness, high thermal and electrical conductivities, and relatively high chemical stability. Tungsten carbides with a binder metal, for example Co or Ni, are mainly used to produce cutting tools, nozzles and molds in the composite form...... More

                        
459 Effect of Microstructure Control on the Mechanical Properties of Hot Worked TiAl Alloy
열간가공된 TiAl 합금의 미세조직 제어가 기계적 특성에 미치는 영향
Jong-hun Kim, Jae-Kwon Kim, Seong-Woong Kim, Yong-Ho Park, Seung Eon Kim
김종훈, 김재권, 김성웅, 박용호, 김승언
Korean J. Met. Mater. 2020;58(7):459-465.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.459

Abstract
The microstructure and mechanical properties of a newly developed, β-phase containing TiAl alloy have been studied through hot working and post heat treatment to enhance room temperature ductility and strength. The controlled microstructures hadthree types of structure, fully lamellar, nearly lamellar and duplex, and were produced by cyclic heat-treatment in..... More

                        
466 Effect of Zn-Doping on the Phase Transition Behavior and Thermoelectric Transport Properties of Cu2Se
Zn 도핑이 Cu2Se의 상전이 거동과 열전수송특성에 미치는 영향
Seung Hyun Jin, Young Soo Lim
진승현, 임영수
Korean J. Met. Mater. 2020;58(7):466-471.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.466

Abstract
We report on the phase transition behavior and thermoelectric transport properties of Zn-doped Cu2Se. Cu2Se is comprised of nontoxic, low-cost and abundant elements, and has been attracting attention because of its very high thermoelectric performance, ZT, at high temperatures. Many studies have reported enhanced ZT in impurity doped Cu2Se, however,..... More

                        
472 A Study on the Corrosion and Microstructure Characteristics of Early Iron Age Bronze Swords Excavated from Sinpung Site in Wanju, Jeollabuk-Do, Republic of Korea
전북 완주 신풍유적 출토 초기철기시대 동검의 부식 및 제작특성
Min Kyeong Jang, Nam Chul Cho
장민경, 조남철
Korean J. Met. Mater. 2020;58(7):472-479.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.472

Abstract
The subject of this study was a bronze sword excavated from the early Iron Age area of Sinpung site in Wanju. SEM-EDS, FE-EPMA and Raman Micro-Spectroscopy analysis methods were applied to investigate the manufacturing techniques and corrosion characteristics. The results of the analysis indicated a casting structure composed of both..... More

                        
480 Effect of Co Leaching on the Vertical Turning Lathe Wear Properties of Polycrystalline Diamond Compact Manufactured by High Temperature and High Pressure Sintering Process
초고온·고압 소결 공정으로 제조된 다결정 다이아몬드 컴팩트(PDC)의 VTL 마모 특성에 미치는 Co 제거의 영향
Min-Seok Baek, Ji-Won Kim, Bae-Gun Park, Hee-Sub Park, Kee-Ahn Lee
백민석, 김지원, 박배건, 박희섭, 이기안
Korean J. Met. Mater. 2020;58(7):480-487.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.480

Abstract
Polycrystalline diamond compact (PDC) has excellent wear resistance, high impact resistance, superior fatigue properties, and has been used in the oil and gas drilling industries. This study investigated the effect of Co leaching on the microstructure, vertical turning lathe (VTL) wear properties of PDCs manufactured by high-temperature and high-pressure (HTHP)..... More

                        
488 Effect of Pre-Aging Treatment on the Mechanical Properties of Cold Rolled Cu-6 wt% Ni-1.4 wt% Si Alloy
Cu-6 wt% Ni-1.4 wt% Si 합금의 압연 후 기계적 성질에 미치는 시효전 처리 영향
Sang Jin Lee, Hyeon Seok Shin, Eun-Ae Choi, Jee Hyuk Ahn, Yoonsuk Choi, Sangshik Kim, Jehyun Lee, Seung Zeon Han
이상진, 신현석, 최은애, 안지혁, 최윤석, 김상식, 이재현, 한승전
Korean J. Met. Mater. 2020;58(7):488-494.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.488

Abstract
Cu-Ni-Si alloys were strengthened by Ni2Si intermetallic compound precipitation in a Cu matrix during aging. The Cu-6 wt% Ni-1.4wt%Si alloy was prepared by water quenching (solution treatment) or air cooling (homogenization treatment) after heating 980 oC for 2 hours and aging at 500 oC for 6 hours. After maintaining a..... More

                        
495 Correlations Between Alkali and Crystallinity in lyocell-Based ACF Probed with X-Ray Diffraction
Young Min Jin, Joon Hyuk Lee, Sang Sun Choi
Korean J. Met. Mater. 2020;58(7):495-500.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.495

Abstract
This study examined the effect of alkalis on lyocell-based activated carbon fibres (ACFs) with high Brunauer-Emmett-Teller (BET) surface areas, using X-ray diffraction (XRD). Here, alkali treatments were conducted using 10 ~ 25 % NaOH and KOH on lyocell samples for 3 h at ambient room temperature. A secondary treatment with..... More

                        
Technical Notes
501 Assessment of H2O Adsorption Characteristics Based on Zeolite Type
제올라이트 종류에 따른 수분 흡착 특성 평가
Kwangbae Kim, Yesol Lim, Eunseok kim, Saera Jin, Hyunjun Lee, Seonghoon Kim, Yunyoung Noh, Ohsung Song
김광배, 임예솔, 김은석, 진새라, 이현준, 김성훈, 노윤영, 송오성
Korean J. Met. Mater. 2020;58(7):501-506.   Published online 2020 Jul 5
DOI: https://doi.org/10.3365/KJMM.2020.58.7.501

Abstract
The properties and H2O adsorption characteristics of two types of zeolites (3A and 13X) with the same shape but different element composition were identified. These zeolites are used in gas purification processes to manufacture 9N ultra-pure inert gases for semiconductor process applications. To analyze the shape and microstructure of the..... More

                        
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