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749 |
Changes in Microstructure, Mechanical Properties, and Electrical Conductivity of Severely Drawn AA1070 Wire with Annealing
Sang-Hyeon Jo, Seong-Hee Lee
Korean J. Met. Mater. 2024;62(10):749-756. Published online 2024 Oct 5 DOI: https://doi.org/10.3365/KJMM.2024.62.10.749
Abstract
The drawing process severely deforms commercial AA1070 alloy for electrical wire, reducing a rod from a diameter of 2.0 mm to 0.4 mm, followed by annealing. The annealing process was conducted at various temperatures ranging from 200℃ to 450℃, with each temperature maintained for 1hour. The effects of increasing annealing..... More
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757 |
A Study on the Green Laser Weldability of Copper-aluminum Battery Materials
배터리 소재 구리-알루미늄의 그린 레이저 용접성에 관한 연구
Hyun Jong Yoo, Myung Jin Kim, Hee Shin Kang유현종, 김명진, 강희신
Korean J. Met. Mater. 2024;62(10):757-765. Published online 2024 Oct 5 DOI: https://doi.org/10.3365/KJMM.2024.62.10.757
Abstract
Copper is widely utilized in electric vehicle batteries due to its excellent electrical conductivity, lightweight, and excellent corrosion resistance. However, copper has a high reflectivity of about 97% for infrared lasers, which makes it difficult to achieve stable welding quality. This study investigated using a green laser to weld nickel-coated..... More
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766 |
Effect of HIP on Creep Properties in the Single Crystal Superalloy
단결정 초내열합금에서 HIP 처리가 크리프 특성에 미치는 영향
Young-Wan Won, Ji-Ho Gu, Je-Hyun Lee원영완, 구지호, 이재현
Korean J. Met. Mater. 2024;62(10):766-776. Published online 2024 Oct 5 DOI: https://doi.org/10.3365/KJMM.2024.62.10.766
Abstract
The Rene N5 is a second-generation single crystal superalloy containing 3wt% Re, commonly used in gas turbine blades for power generation at temperatures up to 1600°C due to its excellent creep life. Generally, single crystal (SX) and directionally solidified (DS) blades are not applied to hot isostatic pressing (HIP) because..... More
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777 |
Effect of Adding W Nanopowder to Inhibit Sintering of Ni Nanopowder for MLCC
MLCC용 Ni 나노파우더의 소결 억제를 위한 W 나노파우더 첨가의 효과
Joonwoon Lee, Guensik Min, Sungmin Lee, Yunggyu Ann, Heung Nam Han이준운, 민건식, 이성민, 안영규, 한흥남
Korean J. Met. Mater. 2024;62(10):777-786. Published online 2024 Oct 5 DOI: https://doi.org/10.3365/KJMM.2024.62.10.777
Abstract
Multilayer ceramic capacitors (MLCCs) are essential fundamental components in electronic devices, enabling miniaturization and high capacitance for energy storage and filtering. A key focus in MLCC research is enhancing capacitance density, for which improving the connectivity of Ni internal electrodes is imperative. The primary cause of reduced electrode connectivity in..... More
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787 |
Enhanced Thermoelectric Performance of Bi0.5Sb1.5Te3 through Precise Pb Doping: Analysis Using the Single Parabolic Band Model
정밀한 Pb 도핑을 통한 Bi0.5Sb1.5Te3의 열전 성능 향상: Single Parabolic Band 모델을 이용한 분석
Ji-Won Kang, Seong-Mee Hwang, Se Yun Kim, Changwoo Lee, Won-Seon Seo, Sang-il Kim, Hyun-Sik Kim강지원, 황성미, 김세윤, 이창우, 서원선, 김상일, 김현식
Korean J. Met. Mater. 2024;62(10):787-795. Published online 2024 Oct 5 DOI: https://doi.org/10.3365/KJMM.2024.62.10.787
Abstract
This study investigates the thermoelectric properties of Pb-doped p-type Bi 0.5Sb 1.5Te 3 alloys using the Single Parabolic Band (SPB) model, focusing on optimizing room-temperature performance. We systematically analyze the effects of Pb doping (0, 0.49, 0.65, 0.81, 0.97, and 1.3 at%) on key parameters including density-of-states effective mass ( md *), non-degenerate mobility..... More
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796 |
Analysis of Thermoelectric Properties of Hot-deformed Bismuth Telluride Sintered Materials
소성변형을 거친 비스무스 텔루라이드 소결체의 열전특성 분석
Sung-Jae Joo, Ji-Hee Son, JeongIn Jang, Bok-Ki Min, Bong-Seo Kim, JongGan Hong, Dae-Keun Lee, Hyungmo Kim주성재, 손지희, 장정인, 민복기, 김봉서, 홍종간, 이대근, 김형모
Korean J. Met. Mater. 2024;62(10):796-802. Published online 2024 Oct 5 DOI: https://doi.org/10.3365/KJMM.2024.62.10.796
Abstract
Bismuth telluride (Bi 2Te 3)-based alloys are widely used for thermoelectric cooling and power generation at low temperatures, and they are the only commercially available materials for thermoelectric applications below 500 K. The rhombohedral unit cell with a large c/a lattice constant ratio consisting of - Te-Bi-Te-Bi-Te- stacked layers inevitably brings about..... More
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803 |
Visible Light-driven Effective Photocatalytic Degradation of the Persistent Organic Pollutant Using Cobalt-doped Strontium Titanate
Shanmugam Mahalingam, Abinaya Srinivasan, Senthil Bakthavatchalam, Chandramohan Govindasamy, Karnan Ramachandiran, Sathish Kumar Paneerselvam, Junghwan Kim
Korean J. Met. Mater. 2024;62(10):803-819. Published online 2024 Oct 5 DOI: https://doi.org/10.3365/KJMM.2024.62.10.803
Abstract
Residual antibiotics in natural aquatic environments pose a critical threat to humans and other organisms. However, most sewage treatment plants fail to remove them. Photocatalytic nanomaterials can efficiently destroy these persistent organic pollutants in wastewater. In this study, we developed a series of cobalt-doped SrTiO 3 (Co-STO) catalysts with different doping..... More
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820 |
Effect of Al Addition to Mg Melt on Microstructure of Mg-Ti Composites in Liquid Metal Dealloying Process
금속 용탕 탈성분법 공정에서 Mg 용탕에 첨가된 Al 합금원소가 Mg-Ti 복합재료의 미세조직에 미치는 영향
Jee Eun Jang, Soo Hyun Joo, Sung Hyuk Park장지은, 주수현, 박성혁
Korean J. Met. Mater. 2024;62(10):820-826. Published online 2024 Oct 5 DOI: https://doi.org/10.3365/KJMM.2024.62.10.820
Abstract
This study investigates the effect of adding Al to Mg molten metal on the microstructural characteristics and hardness of Mg-Ti composites fabricated via a liquid metal dealloying (LMD) process. The addition of Al to the Mg melt significantly reduces the dealloying rate of Cu in a Ti 30Cu 70 precursor during LMD...... More
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827 |
High Temperature Wear Property of Ta-10W Alloy
Ta-10W 합금의 고온 마모 특성
Tae-Hoon Kang, Jung Hyo Park, Kyu-Sik Kim, Kee-Ahn Lee강태훈, 박정효, 김규식, 이기안
Korean J. Met. Mater. 2024;62(10):827-835. Published online 2024 Oct 5 DOI: https://doi.org/10.3365/KJMM.2024.62.10.827
Abstract
This study investigated the high-temperature wear characteristics of Ta-10W alloy, composed of 90% tantalum and 10% tungsten, known for its high melting point, excellent corrosion resistance, and oxidation resistance. Wear tests were conducted using a ball-on-disc method with alumina balls at temperatures of 200°C, 400°C, 600°C, and 700°C. The results..... More
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