Journal of Powder Materials

Jin-Kyu Lee

12 Articles

Milling Behaviors of Al-B₄C Composite Powders Fabricated by Mechanical Milling Process: Sung-Mo Hong, Jin-Ju Park, Eun-Kwang Park, Min-Ku Lee, Chang-Kyu Rhee, Ju-Myoung Kim, Jin-Kyu Lee; J Korean Powder Metall Inst. 2012;19(4):291-296.; DOI: https://doi.org/10.4150/KPMI.2012.19.4.291

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In the present work, Al-B_4C composite powders were fabricated using a mechanical milling process and its milling behaviors and mechanical properties as functions of B_4C sizes ( 100µm, 500 nm and 50 nm) and concentrations (1, 3 and 10 wt.%) were investigated. For achieving it, composite powders and their compacts were fabricated using a planetary ball mill machine and magnetic pulse compaction technology. Al-B_4C composite powders represent the most uniform dispersion at a milling speed of 200 rpm and a milling time of 240 minutes. Also, the smaller B_4C particles were presented, the more excellent compositing characteristics are exhibited. In particular, in the case of the 50 nm B_4C added compact, it showed the highest values of compaction density and hardness compared with the conditions of 100µm and 500 nm additions, leading to the enhancement its mechanical properties.

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Influence of high B4C contents on structural evolution of Al-B4C nanocomposite powders produced by high energy ball milling
Hao Guo, Yu Zhao, Songsong Xu, Junpeng Li, Naimeng Liu, Yang Zhang, Zhongwu Zhang
Ceramics International.2019; 45(5): 5436. CrossRef
Effect of B4C Content on the Sintering Characteristics of 6061Al-B4C Composite Powder
Jin-Ju Park, Sung-Mo Hong, Kyoung-Yeol Kim, Min-Ku Lee, Chang-Kyu Rhee, Won-Hyuk Rhee, Yang Kyu Lee
Journal of Korean Powder Metallurgy Institute.2013; 20(3): 215. CrossRef

Quantitative Study on the Refinement Behaviors of TiC Powders Produced by Mechanical Milling Under Different Impact Energy: Sung-Mo Hong, Eun-Kwang Park, Kyeong-Yeol Kim, Jin-Ju Park, Min-Ku Lee, Chang-Kyu Rhee, Jin-Kyu Lee, Young-Soon Kwon; J Korean Powder Metall Inst. 2012;19(1):32-39.; DOI: https://doi.org/10.4150/KPMI.2012.19.1.032

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This study investigated refinement behaviors of TiC powders produced under different impact energy conditions using a mechanical milling process. The initial coarse TiC powders with an average diameter of 9.3 µm were milled for 5, 20, 60 and 120 mins through the conventional low energy mechanical milling (LEMM, 22G) and specially designed high energy mechanical milling (HEMM, 65G). TiC powders with angular shape became spherical one and their sizes decreased as the milling time increased, irrespective of milling energy. Based upon the FE-SEM and BET results of milled powders, it was found initial coarse TiC powders readily became much finer near 100 nm within 60 min under HEMM, while their sizes were over 200 nm under LEMM, despite the long milling time of up to 120 min. Particularly, ultra-fine TiC powders with an average diameter of 77 nm were fabricated within 60 min in the presence of toluene under HEMM.

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Compaction and Sintering Characteristics of High Energy Ball Milled Mn-Zn Ferrite Powders
Hyunseung Lee, Hoseong Rhee, Sangsoo Lee, Si Young Chang
Korean Journal of Materials Research.2021; 31(12): 677. CrossRef
Fabrication of titanium carbide nano-powders by a very high speed planetary ball milling with a help of process control agents
Sung-Mo Hong, Jin-Ju Park, Eun-Kwang Park, Kyeong-Youl Kim, Jung-Gu Lee, Min-Ku Lee, Chang-Kyu Rhee, Jin Kyu Lee
Powder Technology.2015; 274: 393. CrossRef
Control of Y2O3 phase and its nanostructure formation through a very high energy mechanical milling
M.K. Lee, E.K. Park, J.J. Park, C.K. Rhee
Journal of Solid State Chemistry.2013; 201: 56. CrossRef
Fabrication of Fe coated Mg Based Desulfurization Powder by Mechanical Alloying Process
Joon-Woo Song, Otaduy Guillermo, Byong-Sun Chun, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2012; 19(3): 226. CrossRef
Synthesis and structural properties of Ni–20Cr–2Y2O3 nanocomposite alloy prepared by a very high energy mechanical milling
M.K. Lee, J.J. Park, C.K. Rhee
Materials Chemistry and Physics.2012; 137(1): 129. CrossRef

Synthesis and Characterization of (AgSbTe₂)₁₅(GeTe)₈₅ Thermoelectric Powder by Gas Atomization Process: Hyo-Seob Kim, Jin-Kyu Lee, Jar-Myung Koo, Byong-Sun Chun, Soon-Jik Hong; J Korean Powder Metall Inst. 2011;18(5):449-455.; DOI: https://doi.org/10.4150/KPMI.2011.18.5.449

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In this study, p-type (AgSbTe_2)_15(GeTe)_85: TAGS-85 compound powders were prepared by gas atomization process, and then their microstructures and mechanical properties were investigated. The fabricated powders were of spherical shape, had clean surface, and illustrated fine microstructure and homogeneous AgSbTe_2 + GeTe solid solution. Powder X-ray diffraction results revealed that the crystal structure of the TAGS-85 sample was single rhombohedral GeTe phase, which with a space group R_3m. The grain size of the powder particles increased while the micro Vickers hardness decreased with increasing annealing temperature within the range of 573 K and 723 K due to grain growth and loss of Te. In addition, the crystal structure of the powder went through a phase transformation from rhombohedral (R_3m) at low-temperature to cubic (F_m-3m) at high-temperature with increasing annealing temperature. The micro Vickers hardness of the as-atomized powder was around 165 Hv, while it decreased gradually to 130 Hv after annealing at 673K, which is still higher than most other fabrication processes.

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Thermoelectric properties of n-type Bi2Te3 alloys produced by a combined process of magnetic pulsed compaction (MPC) and spark plasma sintering (SPS)
Chul-Hee Lee, M. Fatih Kilicaslan, Babu Madavali, Soon-Jik Hong
Research on Chemical Intermediates.2014; 40(7): 2543. CrossRef

Rare Metal as a National Strategic Material: Soo-Young Lee, Yul-Kwon Ji, Han-Shin Choi, Hwan-Yong Kim, Jin-Kyu Lee, Taek-Soo Kim; J Korean Powder Metall Inst. 2009;16(3):161-166.; DOI: https://doi.org/10.4150/KPMI.2009.16.3.161

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Synthesis of Ni-based Bulk Metallic Glass Composites: Jin-Kyu Lee; J Korean Powder Metall Inst. 2008;15(4):297-301.; DOI: https://doi.org/10.4150/KPMI.2008.15.4.297

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Abstract PDF: The Ni-based bulk metallic glass matrix composites were fabricated by spark plasma sintering of mixture of gas-atomized metallic glass powders and ductile brass powders. The successful consolidation of metallic glass matrix composite was achieved by strong bonding between metallic glass powders due to viscous flow deformation and lower stress of ductile brass powders in the supercooled liquid state during spark plasma sintering. The composite shows some macroscopic plasticity after yielding, which was obtained by introducing a ductile second brass phase in the Ni-based metallic glass matrix.

Consolidation and Characterization of Cu-based Bulk Metallic Glass Composites: Jin-Kyu Lee, Taek-Soo Kim; J Korean Powder Metall Inst. 2007;14(6):399-404.; DOI: https://doi.org/10.4150/KPMI.2007.14.6.399

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Abstract PDF: The Cu-based bulk metallic glass (BMG) composite was fabricated by spark plasma sintering (SPS) using of gas-atomized metallic glass powders and ductile brass powders. No defect such as pores and cavities was observed at the interface between the brass powder and the metallic glass matrix, suggesting that the SPS process caused a severe viscous flow of the metallic glass and brass phases in the supercooled liquid region, resulting in a full densification. The BMG composites shows some macroscopic plasticity after yielding, although the levels of strength decreased.

Fabrication of Metallic Glass/metallic Glass Composites by Spark Plasma Sintering: Jin-Kyu Lee; J Korean Powder Metall Inst. 2007;14(6):405-409.; DOI: https://doi.org/10.4150/KPMI.2007.14.6.405

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Abstract PDF: The Cu-based bulk metallic glass (BMG) composites containing Zr-based metallic glass phase have been consolidated by spark plasma sintering using the mixture of Cu-based and Zr-based metallic glass powders in their overlapped supercooled liquid region. The Zr-based metallic glass phases are well distributed homogeneously in the Cu-based metallic glass matrix after consolidation process. The successful consolidation of BMG composites with dual amorphous phases was corresponding to the sound viscous flow of the two kinds of metallic glass powders in their overlapped supercooled liquid region.

Application of PM to the Consolidation of Metallic Glassy Powder and its Composites: Su-Min Shin, Taek-Soo Kim, Jin-Kyu Lee, Min-Seok Song, Jeong-Gon Kim; J Korean Powder Metall Inst. 2007;14(6):348-353.; DOI: https://doi.org/10.4150/KPMI.2007.14.6.348

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Abstract PDF: In the present study, Zr-base metallic glass (MG) and Zr-base BMG/diamond composites were fabricated using a combination of gas atomization and spark plasma sintering (SPS). The microstructure, thermal stability and mechanical property of both the specimens as atomized and sintered were investigated. The experimental results showed that the SPSed specimens could be densified into nearly 100% and maintained the initial thermal stability at the sintering temperature of 630K. In addition, MG/diamond powder composites were successfully synthesised using SPS process. The composites, even a very low diamond volume fraction, generated a significant increase in compressive strength. With increasing the diamond volume fraction, the compressive strength was also increased due to the addition of hardest diamonds. It suggests that these composites would be potential candidates for a new cutting tool material.

Extrusion Behavior of Gas Atomized Mg Alloy Powders: Hong-Jun Chae, Young-Do Kim, Jin-Kyu Lee, Jeong-Gon Kim, Taek-Soo Kim; J Korean Powder Metall Inst. 2007;14(4):251-255.; DOI: https://doi.org/10.4150/KPMI.2007.14.4.251

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This work is to report not only the effect of rapid solidification of MgZn_4.3Y_0.7 alloys on the micro-structure, but also the extrusion behavior on the materials properties. The average grain size of the atomized powders was about 3-4µm. The alloy powders of Mg_97Zn_4.3Y_0.7, consisted of I-Phase (Icosahedral, Mg_3Zn_6Y_1) as well as Cubic structured W-Phase (Mg_3Zn_3Y_2), which was finely distributed within alpha-Mg matrix. The oxide layer formed along the Mg surface was about 48 nm in thickness. In order to study the consolidation behavior of Mg alloy powders, extrusion was carried out with the area reduction ratio of 10:1 to 20:1. As the ratio increased, fully deformed and homogeneous microstructure could be obtained, and the mechanical properties such as tensile strength and elongation were simultaneously increased.

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Fabrication and Dynamic Consolidation Behaviors of Rapidly Solidified Mg Alloy Powders
Hong-Jun Chae, Young-Do Kim, Taek-Soo Kim
Journal of Korean Powder Metallurgy Institute.2011; 18(4): 340. CrossRef

Fabrication of Bulk Metallic Glass Composites by Mechanical Milling with Subsequent Spark Plasma Sintering Process: Jin-Kyu Lee, Taek-Soo Kim, Jeong-Gon Kim; J Korean Powder Metall Inst. 2007;14(3):197-201.; DOI: https://doi.org/10.4150/KPMI.2007.14.3.197

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Bulk metallic glass (BMG) composite was fabricated by consolidation of milled metallic glass composite powders. The metallic glass composite powder was synthesized by a controlled milling process using the Cu-based metallic glass powder blended with 30 vol% Zr-based metallic glass powders. The milled composite powders showed a layered structure with three metallic phases, which is formed as a result of mechanical milling. By spark plasma sintering of milled metallic glass powders in the supercooled liquid region, a fully dense BMG composite was successfully synthesized.

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Powder Sintering Characteristics of Carbon Nanotubes Reinforced SKD11 Tool Steel Sintered by Spark Plasma Sintering
Je-Se Moon, Sung-Sil Jung, Dae-Yeol Lee, Young-Keun Jeong, Myung Chang Kang, Chun-Dal Park, Kook-Tae Youn
Journal of Korean Powder Metallurgy Institute.2015; 22(3): 157. CrossRef

Consolidation Behavior of Gas Atomized Mg-Zn-Y Alloy Powders by Spark Plasma Sintering: Jin-Kyu Lee, Taek-Soo Kim, Jung-Chan Bae; J Korean Powder Metall Inst. 2007;14(2):140-144.; DOI: https://doi.org/10.4150/KPMI.2007.14.2.140

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Using Spark Plasma Sintering process (SPS), consolidation behavior of gas atomized Mg_97Zn_1Y_2 alloys were investigated via examining the microstructure and evaluating the mechanical properties. In the atomized ahoy powders, fine Mg_12YZn particles were homogeneously distributed in the alpha-Mg matrix. The phase distribution was maintained even after SPS at 723 K, although Mg_24Y_5 particles were newly precipitated by consolidating at 748 K. The density of the consolidated bulk Mg-Zn-Y alloy was 1.86g/cm3. The ultimate tensile strength (UTS) and elongation were varied with the consolidation temperature.

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High Temperature Deformation Flow Of A ZK60A Magnesium Alloy After Extrusion
M. Kawasaki, H.-J. Lee, M.C. Oh, B. Ahn
Archives of Metallurgy and Materials.2015; 60(2): 1327. CrossRef

Materials Properties of Gas Atomized and Extruded Mg-Zn-Y Alloys: Hong-Jun Chae, Jin-Kyu Lee, Jung-Chan Bae, Taek-Soo Kim; J Korean Powder Metall Inst. 2006;13(6):427-431.; DOI: https://doi.org/10.4150/KPMI.2006.13.6.427

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Mg-4.3Zn-0.7Y (at%) alloy powders were prepared using an industrial scale gas atomizer, followed by warm extrusion. The powders were almost spherical in shape. The microstructure of atomized powders and those extruded bars was examined using Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscope (EDS) and X-ray Diffractometer (XRD). The grain size of the powders was coarsen as the initial powder size increased. After the extrusion, the grain size became fine due to the severe plastic deformation during the extrusion with the ratio of 10:1. Both the ultimate strength and elongation were enhanced with the decrease of initial particle size.

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Fabrication and Dynamic Consolidation Behaviors of Rapidly Solidified Mg Alloy Powders
Hong-Jun Chae, Young-Do Kim, Taek-Soo Kim
Journal of Korean Powder Metallurgy Institute.2011; 18(4): 340. CrossRef

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