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Table of Contents | May, 2022  Vol. 60   No.5 Previous Issue | Next Issue | Archive
In this issue:

Research Papers
341 Analysis of Dimensional Change in Zr-2.5%Nb CANDU Pressure Tube Material aged at 300-400°C using Neutron Diffraction
300-400oC에서 시효 처리된 Zr-2.5%Nb CANDU 압력관 재료에서 중성자 회절을 이용한 dimensional change 분석
Jong Yeob Jung, Hyung Sub Kim, Sung Soo Kim, Young Suk Kim
정종엽, 김형섭, 김성수, 김영석
Korean J. Met. Mater. 2022;60(5):341-349.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.341

Abstract
The primary boundary of the CANDU reactor consists of Zr-2.5%Nb alloy pressure tubes and SA106 alloy feeder pipes. The pressure tubes are exposed to fast neutron (E>1Mev) irradiation during reactor operation, and experience dimensional changes. The actual dimensional change in the pressure tube during in-service operation is greater than the..... More

                        
350 Effects of Electro-force Control on the Microstructure and Welding Characteristic During Resistance Spot Welding
Al 5052-H32 합금의 저항 점 용접 시 가압력 제어 방식에 따른 미세조직 및 용접특성 비교
Wonho Kim, Jaehun Kim, Hyunuk Jun, Jaewon Kim, Eunkyung Lee, Changwook Ji
김원호, 김재훈, 전현욱, 김재원, 이은경, 지창욱
Korean J. Met. Mater. 2022;60(5):350-359.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.350

Abstract
Recently, lightweight vehicle bodies are in increasing demand to satisfy exhaust gas and environmental regulations around the world. In particular, aluminum alloys are widely used to manufacture lightweight parts, because of their excellent properties including corrosion resistance and mechanical properties. After the forming process, the welding process is important for..... More

                        
360 Effect of EMS Process on the Primary Si Refinement, Tensile and Fatigue Properties of Hyper-eutectic Al-15wt.%Si Alloy
과공정 Al-15wt.%Si 합금의 Primary Si 미세화와 인장 및 피로 특성에 미치는 EMS 공정의 영향
Min-Seok Baek, Tae-Hoon Kang, Jong-Ho Kim, Jun-Pyo Park, Kwangjun Euh, Kee-Ahn Lee
백민석, 강태훈, 김종호, 박준표, 어광준, 이기안
Korean J. Met. Mater. 2022;60(5):360-369.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.360

Abstract
This study investigated the effect of the electromagnetic stirring (EMS) process on the microstructure and mechanical properties of hyper-eutectic Al-15 wt.%Si alloy. The tensile and high-cycle fatigue properties of the EMS Al-15wt.%Si alloy were examined and compared with conventional direct chill (DC) cast alloy. The initial microstructure of the as-cast..... More

                        
370 Kerfless Si Wafering Using Al Metal Paste, Epoxy and Ni Electroplating as Stress-Induced Layer
Young Joon Cho, Hyo Sik Chang
Korean J. Met. Mater. 2022;60(5):370-375.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.370

Abstract
Kerfless wafering is a beneficial technique that enhances the cost effectiveness of crystalline silicon (c-Si) solar cells, preventing silicon (Si) waste during diamond sawing. This study compared the advantages of three stress layers for kerfless wafering: aluminum (Al) paste, epoxy-, and electroplated nickel (Ni). These materials demonstrated the ability to..... More

                        
376 Solid-State Synthesis and Thermoelectric Properties of Ge-Doped Tetrahedrites Cu12Sb4-yGeyS13
Se-In Jeong, Il-Ho Kim
Korean J. Met. Mater. 2022;60(5):376-383.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.376

Abstract
Ge-doped tetrahedrites Cu12Sb4-yGeyS13 (y = 0.1–0.4) were prepared using mechanical alloying and hot pressing. An X-ray diffraction analysis after mechanical alloying showed a single tetrahedrite phase without secondary phases. The tetrahedrite phase was stable after hot pressing at 723 K under 70 MPa. As the Ge content increased, the lattice..... More

                        
384 Preparation and Investigation of Thermoelectric Properties of Cu3SbS4-Cu3SbSe4 Solid Solutions
Go-Eun Lee, Il-Ho Kim
Korean J. Met. Mater. 2022;60(5):384-390.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.384

Abstract
Cu-based ternary chalcogenides composed of earth-abundant and nontoxic elements are considered promising thermoelectric materials, although there are few reports on them. In our previous studies, optimal mechanical alloying (MA) and hot pressing (HP) were used to synthesize Cu3SbS4 (famatinite) and Cu3SbSe4 (permingeatite). In this study, solid solutions of Cu3SbS4-ySey (y..... More

                        
391 Optimization of Two-Stage Hybrid Forming Process via Quantitative Assessment of Mechanical Properties in AA5052
Sang Soo Lee, Seon Du Choi, Ho Geun Shin, Suman Timilsina, Seong Min Jang, Young Seon Lee, YongNam Kwon, Ji Sik Kim
Korean J. Met. Mater. 2022;60(5):391-399.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.391

Abstract
Superplastic forming (SPF) is a promising approach used for manufacturing parts with complex geometries, especially in the automotive, aerospace, and marine industries. However, the wider use of this method is limited by issues of low forming rate, high-temperature requirement, non-uniform thickness distribution, and expensive base materials. The two-stage hybrid forming..... More

                        
400 Corrosion Characteristics of Bronze Artifacts Excavated from the Songguk-ri site in Buyeo According to Alloy Ratio and Manufacturing Techniques During the Goryeo Dynasty
부여 송국리 유적 출토 고려시대 청동유물의 합금성분 및 제작기법에 따른 부식 특성
Jun Hyuk Jang, Kwang Yong Chung
장준혁, 정광용
Korean J. Met. Mater. 2022;60(5):400-408.   Published online 2022 Apr 22
DOI: https://doi.org/10.3365/KJMM.2022.60.5.400

Abstract
A comprehensive analysis of the corrosion characteristics of excavated bronze artifacts was conducted according to their alloy ratio and microstructure. Corroded by various factors, which resulted in different corrosion characteristics. Among these, corrosion may occur in the excavated bronze due to the difference in the alloy ratio, which is an..... More

                        
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