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Accepted articles are posted online ahead of regular printed publication.

Research Papers
Effective Removal Method for Layer of FIB-Induced Surface Damage in Austenitic Stainless Steel
집속이온빔 가공 처리된 오스테나이트 스테인리스강의 표면 손상층 제어 방법

Received 2022 Aug 29     Accepted 2022 Nov 8     Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.137    
[Epub ahead of print]

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 phase transformation layer..... More

      
Analysis of a Single Crystal Solidification Process of an Ni-based Superalloy using a CAFE Model
CAFE 모델을 사용한 니켈기 초내열합금 단결정 응고공정 해석

Received 2022 Sep 20     Accepted 2022 Nov 7     Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.126    
[Epub ahead of print]

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 polycrystal blades because..... More

      
Thermal and Mechanical Properties of Cu-Graphite Composites with Spatial Anisotropy
Thermal and Mechanical Properties of Cu-Graphite Composites with Spatial Anisotropy

Received 2022 Jun 2     Accepted 2022 Nov 11     Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.120    
[Epub ahead of print]

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 analysis (DTA) and a..... More

      
Bandgap Reduction and Enhanced Photoelectrochemical Water Electrolysis of Sulfur-doped CuBi2O4 Photocathode
Bandgap Reduction and Enhanced Photoelectrochemical Water Electrolysis of Sulfur-doped CuBi2O4 Photocathode

Received 2022 Dec 28     Accepted 2023 Jan 4     Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.115    
[Epub ahead of print]

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 and holes from..... More

      
Optical and Optoelectronic Properties of Bi2Te3, Sb2Te3, and Bi0.5Sb1.5Te3 Flakes
Bi2Te3, Sb2Te3, 및 Bi0.5Sb1.5Te3 플레이크들의 광학 및 광전자적 특성

Received 2022 Oct 30     Accepted 2022 Nov 28     Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.107    
[Epub ahead of print]

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 on PL and..... More

      
Photo Seebeck Effect of Air Stable MAPbI3
대기중 안정한 MAPbI 3에서의 Photo Seebeck 효과

Received 2022 Jul 2     Accepted 2022 Nov 8     Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.91    
[Epub ahead of print]

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 their composition. MAPbI3, a..... More

      
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

Received 2022 Jul 1     Accepted 2022 Nov 8     Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.84    
[Epub ahead of print]

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 slurry system. We..... More

      
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

Received 2022 Jul 14     Accepted 2022 Nov 14     Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.76    
[Epub ahead of print]

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 Si3N4 layer are the most sensitive to..... More

      
Variation of liquation cracking susceptibility for over–aged 247LC superalloy repair weld heat–affected zone
Variation of liquation cracking susceptibility for over–aged 247LC superalloy repair weld heat–affected zone

Received 2022 Nov 3     Accepted 2002 Nov 28     Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.69    
[Epub ahead of print]

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 was clarified by..... More

      
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

Received 2022 Oct 24     Accepted 2022 Nov 28     Published online 2023 Jan 27
DOI: https://doi.org/10.3365/KJMM.2023.61.2.98    
[Epub ahead of print]

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 parameters. The Single..... More

      
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