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Volume 63(4); Apr 2025
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Research Papers
243 Effect of Sb Doping on the Thermoelectric Properties of MNiSn (M=Ti, Zr, Hf) Half-Heusler Alloys Fabricated by a Rapid Solidification Process
급속 응고 공정으로 합성한 MNiSn (M=Ti, Zr, Hf) 하프-호이슬러에서 Sb 도핑이 열전 특성에 미치는 영향
Eunjin Park, Seong-Hoon Yi
박은진, 이승훈
Korean J. Met. Mater. 2025;63(4):243-250.   Published online 2025 Apr 5
DOI: https://doi.org/10.3365/KJMM.2025.63.4.243

Abstract
Among half-Heusler alloys, MNiSn (M = Ti, Zr, Hf) compounds have been extensively investigated due to their unique crystal structure and promising thermoelectric properties. However, forming the MNiSn half-Heusler single phase directly during the solidification process is challenging, necessitating a prolonged annealing step for homogenization. Rapid Solidification Processing (RSP) was..... More

                
251 Electropolishing for AlSi10Mg Alloy Manufactured by Powder Bed Fusion
Powder Bed Fusion(PBF)으로 제조된 AlSi10Mg 합금을 위한 전해연마 공정
Serim Park, Hyunbin Jo, Woon Ik Park, Junghoon Lee
박세림, 조현빈, 박운익, 이정훈
Korean J. Met. Mater. 2025;63(4):251-263.   Published online 2025 Apr 5
DOI: https://doi.org/10.3365/KJMM.2025.63.4.251

Abstract
The irregular and highly rough surface of AlSi10Mg alloy parts fabricated by metal additive manufacturing technology can result in dimensional instability, poor surface quality and fluid turbulence. Therefore, post-treatments are needed to adjust the surface roughness and irregular surface morphology to satisfy industrial requirements. One of the most promising candidates..... More

                
264 Evaluation of Thermal Properties based on the Shape of Aluminum Powder by a Spark Plasma Sintering Method
방전플라즈마 소결법을 이용한 Al 분말 형태에 따른 열적 특성평가
Bum-Soon Park, Min-Hyeok Yang, Yu-Gyun Park, Hyun-Kuk Park
박범순, 양민혁, 박유균, 박현국
Korean J. Met. Mater. 2025;63(4):264-270.   Published online 2025 Apr 5
DOI: https://doi.org/10.3365/KJMM.2025.63.4.264

Abstract
In this study, a high-melting point element, flake type graphite (Gr.), was added to aluminum (Al) to improve the latter’s thermal properties. Al with different particle shapes, spherical, irregular and flake shape, was mixed with graphite. Al–50 vol.% Gr. powders were mixed by a shaking mixer and sintered under the..... More

                
271 Experimental Evaluation of Unidirectional Pulsating Traveling Magnetic Field Effectiveness for High-Strength 7xxx-Series Aluminum Alloy Slab Semi-Continuous Casting
Mykola Slazhniev, Sung Gyu Choi, John Ok Shin, Kyung Hyun Kim, Hyun Suk Sim
Korean J. Met. Mater. 2025;63(4):271-280.   Published online 2025 Apr 5
DOI: https://doi.org/10.3365/KJMM.2025.63.4.271

Abstract
This study investigates the application of a unidirectional pulsating traveling magnetic field (UPTMF) for the semi-continuous casting of high-strength aluminum alloy 7075 slabs (350×150 mm). The experimental setup involved a comparative analysis of direct chill (DC) casting and electromagnetic stirring (EMS) with a 5 Hz amplitude modulated U-PTMF and 22.5..... More

                
281 Regeneration of NaOH from the Spent Na2SO4 Solution by Two-Compartment Bipolar Membrane Electrodialysis
2액실 바이폴라막 전기투석에 의한 폐 Na2SO4 용액에서 NaOH 재생
Youngjae Lee, Minhyuk Seo, Jaewoo Ahn
이영재, 서민혁, 안재우
Korean J. Met. Mater. 2025;63(4):281-290.   Published online 2025 Apr 5
DOI: https://doi.org/10.3365/KJMM.2025.63.4.281

Abstract
With the recent introduction of various environmental policies focused on carbon neutrality has made recycling a crucial task in the electric vehicle industry. In particular, the recycling of lithium-ion batteries, a critical component of EVs, is becoming increasingly important. The process of recovering valuable metals such as lithium (Li), cobalt..... More

                
291 Method for Measuring the Uptake and Diffusivity of Hydrogen Gas in Sulfur-Crosslinked Ethylene Propylene Diene Monomer Polymer Composites with Fillers Using Image Analysis Algorithm of Water Level
수위의 이미지 분석 알고리즘을 이용한 충전제가 함유된 황가교 EPDM 고분자 복합체의 수소 기체 충전량 및 확산도 측정 방법
Ji Hun Lee, Sang Koo Jeon, Myung Chan Choi, Seung Yeon Kim
이지훈, 전상구, 최명찬, 김승연
Korean J. Met. Mater. 2025;63(4):291-304.   Published online 2025 Apr 5
DOI: https://doi.org/10.3365/KJMM.2025.63.4.291

Abstract
In hydrogen refueling stations, polymer O-rings are used for high-pressure hydrogen containers and transfer pipes to prevent gas leakage. A technology has been developed to measure the hydrogen uptake and diffusivity of the polymer materials used in these O-rings. The process involves charging the polymer material with hydrogen under a..... More

                
305 Effect of Heat Treatment on the Mechanical Properties of Hot-rolled AZMX1100 Alloy
열간 압연된 AZMX1100 합금의 기계적물성에 미치는 열처리 영향
Tae-Yeon Park, In-Chul Choi
박태연, 최인철
Korean J. Met. Mater. 2025;63(4):305-317.   Published online 2025 Apr 5
DOI: https://doi.org/10.3365/KJMM.2025.63.4.305

Abstract
In this study, to investigate the evolution of microstructure and texture, as well as their effect on mechanical properties of AZMX1100 magnesium alloy, AZMX1100 plates were manufactured using the TRC (Twin roll casting) method, which is one of the continuous casting methods With TRC it is possible to reduce the..... More

                
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