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Volume 61(2); Feb 2023
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Research Papers
69 Variation of liquation cracking susceptibility for over–aged 247LC superalloy repair weld heat–affected zone
장시간 열간노출에 따른 247LC 초내열합금 보수용접 열영향부의 액화균열민감도 변화
Hye-Eun Jeong, Seong-Moon Seo, Eun-Joon Chun
정혜은, 서성문, 천은준
Korean J. Met. Mater. 2023;61(2):69-75.   Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.69

Abstract
In this study, the liquation cracking temperature range (LCTR) of over-aged 247LC superalloy repair welds was quantitatively evaluated using spot-Varestraint testing, especially for application in the repair weld heat-affected zone (HAZ). The metallurgical mechanism of the evaluated liquation cracking susceptibility and variation of the LCTRs of the over-aged 247LC superalloys..... More

      
76 Thermal-Cycling-Induced Si3N4 Damage in Semiconductor Devices Assembled Utilizing a Lead-on-Chip Package
리드-온-칩 패키지 기술로 조립된 반도체 디바이스에서 온도변화에 의해 발생되는 Si3N4 손상
Seong-Min Lee, Yeon-Wook Kim
이성민, 김연욱
Korean J. Met. Mater. 2023;61(2):76-83.   Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.76

Abstract
This article shows how fractures in the Si3N4 layer, which comprises the top layer of semiconductor devices encapsulated utilizing a lead-on-chip (LOC) packaging technique, are influenced by changes in the lead-frame materials and thermal-cycling test conditions. Using thermal-cycling tests, it was found that fractures in the Si 3 N 4..... More

      
84 Battery Cycle Stability in Additive-free MAX(Ti3AlC2) Li-ion Battery Anode
전기 영동 증착을 통한 첨가제 없는 MAX(Ti3AlC2) 리튬 이온 배터리 음극의 사이클 안정성
Jae-Young Hong, Byoung-Nam Park
홍재영, 박병남
Korean J. Met. Mater. 2023;61(2):84-90.   Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.84

Abstract
We fabricated an additive-free MAX(Ti3AlC2) phase Li-ion battery (LIB) electrode using the electrophoretic deposition (EPD) method. In this study, MAX, a precursor of MXene, which has recently been receiving great attention as a negative electrode material for LIBs, was manufactured as a coin cell through EPD rather than the conventional..... More

      
91 Photo Seebeck Effect of Air Stable MAPbI3
대기중 안정한 MAPbI3에서의 Photo Seebeck 효과
Yuseong Kim, Byoungnam Park
김유성, 박병남
Korean J. Met. Mater. 2023;61(2):91-97.   Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.91

Abstract
With increasing interest in energy harvesting using heat as a next-generation eco-friendly energy source, organic-inorganic perovskite materials have emerged as promising materials for thermoelectric devices. In particular, the photo-Seebeck effect of halide perovskite materials has attracted attention due to their wide optical absorption spectrum and large diffusion length, depending on..... More

      
98 Characterization of Electronic Transport Properties of Narrow-Band Gap Fe(Se1-xTex)2 Alloys via the Two-Band Model
Two-Band 모델을 이용한 작은 밴드 갭을 가진 Fe(Se1-xTex)2 열전합금의 전기적 수송 특성 분석
Seong-Mee Hwang, Sang-il Kim, Min-Su Heo, Kiyoung Lee, Heesun Yang, Won-Seon Seo, Hyun-Sik Kim
황성미, 김상일, 허민수, 이기영, 양희선, 서원선, 김현식
Korean J. Met. Mater. 2023;61(2):98-106.   Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.98

Abstract
Environmentally sustainable thermoelectric technologies can be more broadly applied in industries once the performance of thermoelectric materials is improved. Several approaches have been proposed to improve the electronic transport properties of thermoelectric materials. The effects of each approach on the electronic properties can be evaluated by changes in the band..... More

      
107 Optical and Optoelectronic Properties of Bi2Te3, Sb2Te3, and Bi0.5Sb1.5Te3 Flakes
Bi2Te3, Sb2Te3, 및 Bi0.5Sb1.5Te3 플레이크들의 광학 및 광전자적 특성
Hyeun Seung Jo, Ju Won Kim, Sang-iL Kim, TaeWan Kim
조현승, 김주원, 김상일, 김태완
Korean J. Met. Mater. 2023;61(2):107-114.   Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.107

Abstract
In this study, a mechanical exfoliation method was developed for the synthesis of high purity Bi2Te3, Sb2Te3, and Bi0.5Sb1.5Te3 flakes. The synthesized Bi2Te3, Sb2Te3, and Bi0.5Sb1.5Te3 flakes were characterized by atomic force microscope, Raman spectroscopy, and photoluminescence (PL). The effect of the thickness of the Bi2Te3, Sb2Te3, and Bi0.5Sb1.5Te3 flakes..... More

      
115 Bandgap Reduction and Enhanced Photoelectrochemical Water Electrolysis of Sulfur-doped CuBi2O4 Photocathode
Eunhwa Kim, Sanghan Lee, Sangwoo Ryu
Korean J. Met. Mater. 2023;61(2):115-119.   Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.115

Abstract
As interest in hydrogen energy grows, eco-friendly methods of producing hydrogen are being explored. CuBi2O4 is one of the p-type semiconductor cathode materials that can be used for photoelectrochemical hydrogen production via environment-friendly water electrolysis. CuBi2O4 has a bandgap of 1.5 – 1.8 eV which allows it to photogenerate electrons..... More

      
120 Thermal and Mechanical Properties of Cu-Graphite Composites with Spatial Anisotropy
Geon Hong Ryu, Changil Son, Jeffrey C. Suhling, Jiseok Lee, Sangha Park, Myunghwan Byun
Korean J. Met. Mater. 2023;61(2):120-125.   Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.120

Abstract
In the present study, we analyzed the thermal and mechanical properties of Cu-graphite composites (CGCs) with spatially anisotropic graphite layers. These composites were fabricated using a combination of electroless plating and spark plasma sintering (SPS) processes. Thermal conductivities and thermal expansion coefficients of the composites were measured using differential thermal..... More

      
126 Analysis of a Single Crystal Solidification Process of an Ni-based Superalloy using a CAFE Model
CAFE 모델을 사용한 니켈기 초내열합금 단결정 응고공정 해석
Jae Jun Jeong, HyungSoo Lee, Dae Won Yun, Hi Won Jeong, Young-Soo Yoo, Seong-Moon Seo, Je Hyun Lee
정재준, 이형수, 윤대원, 정희원, 유영수, 서성문, 이재현
Korean J. Met. Mater. 2023;61(2):126-136.   Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.126

Abstract
The efficiency of gas turbines depends on the gas turbine working temperature. Single crystal blades are being applied more often than equiaxed blades in gas turbine engines, to increase the turbine inlet temperature, resulting in enhanced turbine engine efficiency. Single crystal blades endure creep conditions at high temperature better than..... More

      
137 Effective Removal Method for Layer of FIB-Induced Surface Damage in Austenitic Stainless Steel
집속이온빔 가공 처리된 오스테나이트 스테인리스강의 표면 손상층 제어 방법
Hyung-Ha Jin, I Seul Ryu
진형하, 류이슬
Korean J. Met. Mater. 2023;61(2):137-143.   Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.137

Abstract
There is substantial concern about the phase change to artificial ferrite or martensite in commercial austenitic stainless steels during intense focused-ion-beam milling. In this work, severe Ga ion milling to prepare microscale samples was found to produce thin transformed layers on the surface of austenitic stainless steel. The surface BCC..... More

      
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