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Table of Contents | March, 2022  Vol. 60   No.3 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
169 Through-Thickness Microstructures and Yield Strength Enhancement for AZ31 Mg Sheets Treated by Ultrasonic Nanocrystal Surface Modification
초음파 미세 표면 냉간단조법(UNSM)을 적용한 AZ31 마그네슘 판재의 단면 미세조직 및 강도 향상 효과 분석
Myungsung Kang, Joo-Hee Kang, Hyeonuk Park, Jun-Hyung Kim, Young-Sik Pyoun, Minjae Baek, Dong Jun Lee, Seung Jin Lee, Sanghu Park, Hong Moule Kim, Sung Hyuk Park, Yoon Suk Choi
강명성, 강주희, 박현욱, 김준형, 편영식, 백민재, 이동준, 이승진, 박상후, 김홍물, 박성혁, 최윤석
Korean J. Met. Mater. 2022;60(3):169-179.   Published online 2022 Feb 8
DOI: https://doi.org/10.3365/KJMM.2022.60.3.169

Abstract
An ultrasonic nanocrystal surface modification (UNSM) technique was applied to a 1-mm thick AZ31 magnesium sheet. UNSM is a relatively new surface modification technique in which a hard, hemispherical tip (2.38 mm in diameter) strikes the surface at an ultrasonic frequency to induce plastically deformed gradient microstructures and deep compressive..... More

                        
180 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

                        
188 Separation of Pd(II) and Zn(II) by Solvent Extraction using Commercial Extractants from Hydrochloric Acid Leaching Solution of Cemented Pd from Spent Electroplating Solutions
도금폐액에 함유된 팔라듐의 아연치환물 염산침출액에서 상용화추출제를 이용한 용매추출로 팔라듐(II)과 아연(II)의 분리
Si Jeong Song, Viet Nhan Hoa Nguyen, Man Seung Lee
송시정, Viet Nhan Hoa Nguyen, 이만승
Korean J. Met. Mater. 2022;60(3):188-197.   Published online 2022 Feb 8
DOI: https://doi.org/10.3365/KJMM.2022.60.3.188

Abstract
The demand for palladium (Pd) has increased and this has made it necessary to recover pure Pd from diverse secondary resources. To recover the small amount of Pd(II) present in spent electroplating solutions, Pd(II) is concentrated by cementation with zinc metal. In this work, a hydrometallurgical process consisting of leaching..... More

                        
198 Effects of Blended Poly(3-hexylthiophene) and 6,13-bis(triisopropylsilylethynyl) pentacene Organic Semiconductors on the Photoresponse Characteristics of Thin-Film Transistors
Hyunji Shin, Hyeonju Lee, Bokyung Kim, Xue Zhang, Jin-Hyuk Bae, Jaehoon Park
Korean J. Met. Mater. 2022;60(3):198-205.   Published online 2022 Feb 8
DOI: https://doi.org/10.3365/KJMM.2022.60.3.198

Abstract
In this study, we demonstrate high-performance optical wavelength-selective organic thin-film transistors (TFTs) that incorporate heterogeneous organic semiconductor materials, poly(3-hexylthiophene) (P3HT) and 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene). The electrical characteristics of the fabricated transistors were analyzed in the dark to determine how the P3HT:TIPS-pentacene ratio of the semiconductor affected the performance of the..... More

                        
206 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

                        
213 Thermoelectric Properties of Ta-doped Zr0.6-xTi0.4TaxNiSn n-type Half-Heusler Materials
Ta 도핑된 Zr0.6-xTi0.4TaxNiSn n형 하프-호이슬러 소재의 열전특성
Sung-Jae Joo, Ji-Hee Son, JeongIn Jang, Bok-Ki Min, Bong-Seo Kim
주성재, 손지희, 장정인, 민복기, 김봉서
Korean J. Met. Mater. 2022;60(3):213-219.   Published online 2022 Feb 8
DOI: https://doi.org/10.3365/KJMM.2022.60.3.213

Abstract
Half-Heusler (HH) thermoelectric materials are promising for mid- to high-temperature applications, and MNiSn (M = Ti, Zr, Hf) is a representative n-type HH alloy. In general, the M sites are mixed with isoelectronic elements Ti, Zr, and Hf, to lower the lattice thermal conductivity, and the Sn sites are doped..... More

                        
220 Organic-Inorganic Hybrid Gate Dielectrics Using Self-Assembled Multilayers For Low-Voltage Operating Thin-Film Transistors
Yong-Wan Kim, Young-Geun Ha
Korean J. Met. Mater. 2022;60(3):220-226.   Published online 2022 Feb 8
DOI: https://doi.org/10.3365/KJMM.2022.60.3.220

Abstract
Advanced electronic materials have attracted great interest for their potential use in flexible, large-area, and printable electronic applications. However, fabricating high-performance low-voltage thin-film transistors (TFTs) for those applications with these advanced semiconductors is still challenging because of a lack of dielectric materials which satisfy both the required electrical and physical..... More

                        
227 Tensile and Fatigue Characteristics of WC-20wt%Co Cemented Carbide with Sintering Methods
소결 방법에 따른 WC-20wt%Co 초경합금의 인장 특성 및 피로 수명
Seong Hyeon Ryu, Mu Geun Jo, Kyung Il Kim, Wooram Noh, Ik Je Hong, Kwang Hee Lee, Sang Sub Kim, Gue Serb Cho
류성현, 조무근, 김경일, 노우람, 홍익제, 이광희, 김상섭, 조규섭
Korean J. Met. Mater. 2022;60(3):227-236.   Published online 2022 Feb 8
DOI: https://doi.org/10.3365/KJMM.2022.60.3.227

Abstract
WC-Co cemented carbide has excellent mechanical properties and is widely used in many industrial applications including cold forging die and cutting tools. WC-Co cemented carbide is manufactured by liquid phase sintering (LPS), and a new sintering process for densification has been developed. In this study, cylindrical rod shaped tensile and..... More

                        
237 Characteristics of Functionalized Carbon Nanotube Composites to Reinforce Hydrogen Storage Applications
수소 저장 적용을 위한 기능화된 카본 나노 튜브 복합체의 강화 특징
Dong-Young Kim, Sung-Hoon Park
김동영, 박성훈
Korean J. Met. Mater. 2022;60(3):237-243.   Published online 2022 Feb 8
DOI: https://doi.org/10.3365/KJMM.2022.60.3.237

Abstract
Recent studies have extensively studied the use of composites of carbon nanotubes (CNTs) dispersed in epoxy resin to mechanically reinforce hydrogen storage and lightweight vehicle applications. The mechanical properties of the composite are strengthened due to load transfer from the epoxy matrix to the CNTs when an external force is..... More

                        
244 Effect of Inorganic Additives and Sintering Temperature on Adsorbents
흡착 성형체에 미치는 무기첨가제와 소성온도의 영향
Min A Bae, Kyeong Ho Kim, Jae Ho Baek
배민아, 김경호, 백재호
Korean J. Met. Mater. 2022;60(3):244-250.   Published online 2022 Feb 8
DOI: https://doi.org/10.3365/KJMM.2022.60.3.244

Abstract
Magnesium silicate is a porous material with a large specific surface area and is easily adsorbed. In particular, it is widely used commercially because it is very effective for adsorbing Na+, K+ ions and other catalysts. However, if the powder is used as an adsorbent as is, there are disadvantages,..... More

                        
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