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Table of Contents | January, 2024  Vol. 62   No.1 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
1 Comparison of Weldability and Microstructure in Resistance Spot Welding of Aluminum 5052-H32 Alloy and Al 6014-T4 Alloy
알루미늄 5052-H32 합금과 6014-T4 합금의 저항 점 용접 시 용접성 및 미세조직 비교
Hyun-Uk Jun, Jaehun Kim, Wonho Kim, Jooyong Cheon, Ki-Man Bae, Eun-Kyung Lee, Yeong-Do Park, Changwook Ji
전현욱, 김재훈, 김원호, 천주용, 배기만, 이은경, 박영도, 지창욱
Korean J. Met. Mater. 2024;62(1):1-11.   Published online 2023 Dec 29
DOI: https://doi.org/10.3365/KJMM.2024.62.1.1

This study was performed to compare the resistance spot weldability of Al 5052-H32 alloy and Al 6014-T4 alloy, and the cause of the differences in the weldability was investigated. In general, the surface of the aluminum alloy has an oxide film several nm thick, and local heat input is generated..... More

12 Transient Liquid-Phase Sinter-Bonding Characteristics of a 5 um Cu@Sn Particle-Based Preform for High-Speed Die Bonding of Power Devices
파워 소자의 고속 다이 접합을 위한 5 um Cu@Sn 입자 기반 프리폼의 천이액상 소결접합 특성
Byeong Jo Han, Sang Ho Cho, Kang Rok Jeon, Jong-Hyun Lee
한병조, 조상호, 전강록, 이종현
Korean J. Met. Mater. 2024;62(1):12-21.   Published online 2023 Dec 29
DOI: https://doi.org/10.3365/KJMM.2024.62.1.12

To ensure the high-temperature stability of a bondline under next-generation power devices such as SiC semiconductors, a die bonding test was performed by transient liquid-phase (TLP) sinter-bonding using a Sn-coated Cu (Cu@Sn) particle-based preform. Compared to the existing 20 min-bonding result using a 30 μm Cu@Sn particle-based preform, a 5..... More

22 Effect of Single Crystal Growth and Solidification Grain Boundaries on Weld Solidification Cracking Behavior of CMSX-4 Superalloy
CMSX-4 초내열합금 용접 응고균열 거동에 미치는 단결정 성장 및 응고결정립계의 영향
Kyeong-Min Kim, Ye-Seon Jeong, D.V. Kiran, Suk-Hwan Kwon, Seong-Moon Seo, Eun-Joon Chun
김경민, 정예선, D.V. Kiran, 권석환, 서성문, 천은준
Korean J. Met. Mater. 2024;62(1):22-31.   Published online 2023 Dec 29
DOI: https://doi.org/10.3365/KJMM.2024.62.1.22

Single-crystal superalloys have been popularly employed in high-temperature parts of gas turbines, such as blades. However, the welds of such alloys are highly susceptible to solidification cracking, which limits their applicability to high-temperature turbine blades. In this study, the effects of characteristics of weld solidification on solidification cracking susceptibilities (solidification..... More

32 Effect of Heat Treatment Temperature on Microstructure, Tensile Properties and δ-Precipitate Phase in Ni-based Superalloy
Ni-based 초내열합금의 미세조직, 인장특성, δ 석출상에 미치는 열처리 온도의 영향
Jeon Young Song, Ji Ho Gu, Jong Ho Shin, Won Hui Jo, Cho Hyeon Lee, Jae Bok Seol, Young Wha Ma
송전영, 구지호, 신종호, 조원희, 이초현, 설재복, 마영화
Korean J. Met. Mater. 2024;62(1):32-38.   Published online 2023 Dec 29
DOI: https://doi.org/10.3365/KJMM.2024.62.1.32

Here, we investigated the influence of δ-precipitate (orthorhombic D0a Ni3Nb-ordered phase) on the room- and high-temperature tensile properties in wrought nickel-based Inconel 625 superalloys subjected to solution and aging heat treatment. Typically, solution heat-treatment temperatures in these alloys affect the solid-state precipitation of δ-phase, which governs high-temperature tensile properties. While..... More

39 Research on Flexible Transparent Conductive Electrodes Based on Ultra-Thin Ag in the Form of Grain Boundary with IZO Layer
초박막 결정립계 형태의 Ag와 IZO 기반 유연투명전극 제작연구
Tae Hoon Park
Korean J. Met. Mater. 2024;62(1):39-44.   Published online 2023 Dec 29
DOI: https://doi.org/10.3365/KJMM.2024.62.1.39

In this paper, we investigated a transparent conductive electrode (TCE) that satisfies electrical, optical, and mechanical properties, formed by depositing ultra-thin Ag metal in the form of a random grain boundary with an indium zinc oxide (IZO) layer on a PET substrate. Commonly used ITO electrodes are brittle and difficult..... More

45 Thermoelectric Properties of N-type Mg3La0.005MnxSbBi Materials Doped with La and Mn
La과 Mn으로 이중 도핑된 n형 Mg3La0.005MnxSbBi의 열전특성
Sung-Jae Joo, JiHui Son, JeongIn Jang, Bok-Ki Min, Bong-Seo Kim
주성재, 손지희, 장정인, 민복기, 김봉서
Korean J. Met. Mater. 2024;62(1):45-50.   Published online 2023 Dec 29
DOI: https://doi.org/10.3365/KJMM.2024.62.1.45

Mg3Sb2-based n-type materials are consisted of earth-abundant elements and possess comparable thermoelectric properties with n-type Bi2Te3 at low temperatures, which make them promising candidates for cooling and power generation applications in terms of cost and performance. Substitution of Sb atom with chalcogen elements (Te, Se S) is a conventional method..... More

51 Control of Self-Assembly and Elemental Mixing of AuNi Bimetallic Nanoparticles via Solid-State and Liquid-State Dewetting of Metal Thin Films
금속박막의 고상 및 액상 비젖음 공정을 통한 AuNi 이종금속 나노입자의 자기 정렬 및 성분 혼합 제어
Yoon Hwan Moon, Jong Geun Park, Yong Jun Oh
문윤환, 박종근, 오용준
Korean J. Met. Mater. 2024;62(1):51-56.   Published online 2023 Dec 29
DOI: https://doi.org/10.3365/KJMM.2024.62.1.51

Immiscible Au-Ni alloy thin films undergo phase separation and dewetting because of thermodynamic and morphological instability at elevated temperatures below the miscibility gap. We report the formation and assembly of bimetallic nanoparticles (BNPs) on topographic Si templates. An ordered array of inverted pyramidal pits were produced via solid-state and liquid-state..... More

57 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

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

65 Material Selection: Material Perception Data Analysis Using Clustering Analysis and Association Rule Analysis of Data Mining
재료선택: 데이터 마이닝의 군집분석과 연관규칙분석을 이용한 재료지각 데이터 분석
Jaeho Choi
Korean J. Met. Mater. 2024;62(1):65-72.   Published online 2023 Dec 29
DOI: https://doi.org/10.3365/KJMM.2024.62.1.65

To select materials suitable for products, material perception, which is the feeling consumers have about materials, has been studied. Material perception data were obtained through surveys using digital logic for bipolar adjective pairs. The material perception data were analyzed through unsupervised learning of data mining. Prior to data analysis, to..... More

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