Journal of Powder Materials

Taek-Soo Kim

21 Articles

Luminescent Characteristics of CdSe Quantum Dot Phosphor Depending on Se Precursor Ratio: Nu Si A Eom, Taek-Soo Kim, Yong-Ho Choa, Bum Sung Kim; J Korean Powder Metall Inst. 2012;19(6):442-445.; DOI: https://doi.org/10.4150/KPMI.2012.19.6.442

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The quantum dots (QD) have unique electrical and optical properties due to quantum dot confinement effect. The optical properties of QDs are decided by various synthesis conditions. In a prior QDs study, a study on the QDs size with synthesis condition such as synthesis time and temperature is being extensively researched. However, the research on QDs size with composition ratio has hitherto received scant attention. In order to evaluate the ratio dependence of CdSe crystal, synthesis ratio of Se precursor is changed from 16.7 mol%Se to 44 mol%Se. As the increasing Se ratio, the band gap was increased. This is caused by red shift of emission. We confirmed optical property of CdSe QDs with composition ratio.

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Synthesis and analysis CdSe/ZnS quantum dot with a Core/shell Continuous Synthesis System Using a Microfluidic Reactor
Myung Hwan Hong, So Young Joo, Lee-Seung Kang, Chan Gi Lee
Journal of Korean Powder Metallurgy Institute.2018; 25(2): 132. CrossRef
Multimodal luminescence properties of surface-treated ZnSe quantum dots by Eu
Ji Young Park, Da-Woon Jeong, Kyoung-Mook Lim, Yong-Ho Choa, Woo-Byoung Kim, Bum Sung Kim
Applied Surface Science.2017; 415: 8. CrossRef
Optical Characteristics of CdSe/ZnS Quantum Dot with Precursor Flow Rate Synthesized by using Microreactor
Ji Young Park, Da-Woon Jeong, Won Ju, Han Wook Seo, Yong-Ho Choa, Bum Sung Kim
journal of Korean Powder Metallurgy Institute.2016; 23(2): 91. CrossRef

Ultrafine Grained Cu-diamond Composites using High Pressure Torsion: Eun-Yoo Yoon, Dong-Jun Lee, Taek-Soo Kim, Hyoung-Seop Kim; J Korean Powder Metall Inst. 2012;19(3):204-209.; DOI: https://doi.org/10.4150/KPMI.2012.19.3.204

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In this work, powder metallurgy and severe plastic deformation by high-pressure torsion (HPT) approaches were combined to achieve both full density and grain refinement at the same time. Pure Cu powders were mixed with 5 and 10 vol% diamonds and consolidated into disc-shaped samples at room temperature by HPT at 1.25 GPa and 1 turn, resulting in ultrafine grained metallic matrices embedded with diamonds. Neither heating nor additional sintering was required with the HPT process so that in situ consolidation was successfully achieved at ambient temperature. Significantly refined grain structures of Cu metallic matrices with increasing diamond volume fractions were observed by electron backscatter diffraction (EBSD), which enhanced the microhardness of the Cu-diamond composites.

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Effect of a nano-sized TiC particle addition on the flow-assisted corrosion resistance of SA 106B carbon steel
Jin-Ju Park, Eun-Kwang Park, Gyoung-Ja Lee, Chang-Kyu Rhee, Min-Ku Lee
Applied Surface Science.2017; 415: 143. CrossRef
Analyses of Densification and Consolidation of Copper Powders during High-Pressure Torsion Process Using Finite Element Method
Dong Jun Lee, Eun Yoo Yoon
Journal of Korean Powder Metallurgy Institute.2015; 22(1): 6. CrossRef
Trend in Research of Powder Consolidation Using Severe Plastic Deformation
Eun Yoo Yoon, Dong Jun Lee, Dong-Hyun Ahn, Hyuk Jae Jeong, Hyoung Seop Kim
Journal of Korean Powder Metallurgy Institute.2013; 20(2): 148. CrossRef
Microstructure Evolution and Mechanical Properties of Al-1080 Processed by a Combination of Equal Channel Angular Pressing and High Pressure Torsion
Mohamed Ibrahim Abd El Aal, Eun Yoo Yoon, Hyoung Seop Kim
Metallurgical and Materials Transactions A.2013; 44(6): 2581. CrossRef
Grinding Behaviour of Aluminum Powder for Al/CNTs Nano Composites Fabrication by Dry Grinding Process Using a High Speed Planetary Ball Mill
Heekyu Choi, Jehyun Lee, Seongsoo Kim, Gyungpil Choi, Daehyung Bae, Sungbak Lee, Woong Lee
Korean Journal of Materials Research.2013; 23(2): 89. CrossRef
Densification of Copper Powders using High-pressure Torsion Process
Dong-Jun Lee, Eun-Yoo Yoon, Soo-Young Kang, Jung-Hwan Lee, Hyoung-Seop Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(5): 333. CrossRef

Fabrication and Dynamic Consolidation Behaviors of Rapidly Solidified Mg Alloy Powders: Hong-Jun Chae, Young-Do Kim, Taek-Soo Kim; J Korean Powder Metall Inst. 2011;18(4):340-346.; DOI: https://doi.org/10.4150/KPMI.2011.18.4.340

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Abstract PDF: In order to improve the weak mechanical properties of cast Mg alloys, Mg-Zn_1Y_2 (at%) alloy powders were synthesized using gas atomization, a typical rapid solidification process. The powders consist of fine dendrite structures less than 3 µm in arm spacing. In order to fabricate a bulk form, the Mg powders were compacted using magnetic pulse compaction (MPC) under various processing parameters of pressure and temperature. The effects of the processing parameters on the microstructure and mechanical properties were systematically investigated.

Thermoelectric Properties of Rapid Solidified p-type Bi₂Te₃ Alloy Fabricated by Spark Plasma Sintering(SPS) Process: Chul-Dong Moon, Soon-Jik Hong, Do-Hyang Kim, Taek-Soo Kim; J Korean Powder Metall Inst. 2010;17(6):494-498.; DOI: https://doi.org/10.4150/KPMI.2010.17.6.494

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The p-type thermoelectric compounds of Bi_2Te_3 based doped with 3wt% Te were fabricated by a combination of rapid solidification and spark plasma sintering (SPS) process. The effect of holding time during spark plasma sintering (SPS) on the microstructure and thermoelectric properties were investigated using scanning electron microscope (SEM), X-ray diffraction (XRD) and thermoelectric properties. The powders as solidified consisted of homogeneous thermoelectric phases. The thermoelectric figure of merit measured to be maximum (3.41times10-3/K) at the SPS temperature of 430°C.

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Effect of Sintering Temperature on the Thermoelectric Properties of Bismuth Antimony Telluride Prepared by Spark Plasma Sintering
경석 이, 영근 정, 성호 서, 상현 진, 봉영 유
Korean Journal of Materials Research.2012; 22(6): 280~284. CrossRef

Refinement Behavior of Coarse Magnesium Powder by High Energy Ball Milling (HEBM): Joon-Woo Song, Hyo-Seob Kim, Hong-Moule Kim, Taek-Soo Kim, Soon-Jik Hong; J Korean Powder Metall Inst. 2010;17(4):302-311.; DOI: https://doi.org/10.4150/KPMI.2010.17.4.302

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In this research, the refinement behavior of the coarse magnesium powders fabricated by gas atomization was investigated as a function of milling time using a short duration high-energy ball milling equipment, which produces fine powders by means of an ultra high-energy within a short duration. The microstructure, hardness, and formability of the powders were investigated as a function of milling time using X-ray diffraction, scanning electron microscopy, Vickers micro-hardness tester and magnetic pulsed compaction. The particle morphology of Mg powders changed from spherical particles of feed metals to irregular oval particles, then platetype particles, with increasing milling time. Due to having HCP structure, deformation occurs due to the existence of the easily breakable C-axis perpendicular to the base, resulting in producing plate-type powders. With increasing milling time, the particle size increased until 5 minutes, then decreased gradually reaching a uniform size of about 50 micrometer after 20 minutes. The relative density of the initial power was 98% before milling, and mechanically milled powder was 92~94% with increase milling time (1~5 min) then it increased to 99% after milling for 20 minutes because of the change in particle shapes.

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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
Journal of Korean Powder Metallurgy Institute.2012; 19(1): 32. 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
Characteristics of Indium Dissolution of Waste LCD Panel Powders Fabricated by High Energy Ball Milling (HEBM) Process with Milling Time
Hyo-Seob Kim, Jun-Je Sung, Cheol-Hee Lee, Hyun-Seon Hong, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2011; 18(4): 378. CrossRef
Microstructure and Mechanical Properties of Nano-sized Ti-35%Nb-7%Zr-10%CPP Composite Fabricated by Pulse Current Activated Sintering
Kee-Do Woo, Duck-Soo Kang, Sang-Hyuk Kim, Sang-Hoon Park, Ji-Young Kim, Hye-Rim Ko
Journal of Korean Powder Metallurgy Institute.2011; 18(2): 188. CrossRef

Consolidation and Mechanical Behavior of Gas Atomized MgZn_4.3Y_0.7 Alloy Powders using High Pressure Torsion: Eun-Yoo Yoon, Hong-Jun Chae, Taek-Soo Kim, Chong-Soo Lee, Hyoung-Seop Kim; J Korean Powder Metall Inst. 2010;17(3):190-196.; DOI: https://doi.org/10.4150/KPMI.2010.17.3.190

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In this paper, rapid solidified Mg-4.3Zn-0.7Y (at.%) alloy powders were prepared using an inert gas atomizer, followed by a severe plastic deformation technique of high pressure torsion (HPT) for consolidation of the powders. The gas atomized powders were almost spherical in shape, and grain size was as fine as less than 5;µm due to rapid solidification. Plastic deformation responses during HPT were simulated using the finite element method, which shows in good agreement with the analytical solutions of a strain expression in torsion. Varying the HPT processing temperature from ambient to 473 K, the behavior of powder consolidation, matrix microstructural evolution and mechanical properties of the compacts was investigated. The gas atomized powders were deformed plastically as well as fully densified, resulting in effective grain size refinements and enhanced microhardness values.

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Trend in Research of Powder Consolidation Using Severe Plastic Deformation
Eun Yoo Yoon, Dong Jun Lee, Dong-Hyun Ahn, Hyuk Jae Jeong, Hyoung Seop Kim
Journal of Korean Powder Metallurgy Institute.2013; 20(2): 148. CrossRef
Densification of Copper Powders using High-pressure Torsion Process
Dong-Jun Lee, Eun-Yoo Yoon, Soo-Young Kang, Jung-Hwan Lee, Hyoung-Seop Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(5): 333. CrossRef
Ultrafine Grained Cu-diamond Composites using High Pressure Torsion
Eun-Yoo Yoon, Dong-Jun Lee, Taek-Soo Kim, Hyoung-Seop Kim
Journal of Korean Powder Metallurgy Institute.2012; 19(3): 204. CrossRef
Densification and Nanocrystallization of Water-Atomized Pure Iron Powder Using High Pressure Torsion
Eun-Yoo Yoon, Dong-Jun Lee, Ha-Neul Kim, Hee-Soo Kang, Eon-Sik Lee, Hyoung-Seop Kim
Journal of Korean Powder Metallurgy Institute.2011; 18(5): 411. CrossRef

Microstructure Control of Mg Alloy Powder Using a Repeated Extrusion Process: Jeong-Gon Kim, Han-Shin Choi, Taek-Soo Kim; J Korean Powder Metall Inst. 2009;16(6):438-441.; DOI: https://doi.org/10.4150/KPMI.2009.16.6.438

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Mg-Cu composites were successively fabricated using a combination of rapid solidification and extrusion processes. In addition, the microstructural variation of the composite was investigated by performing the extrusion repeatedly. It resulted that the composite formed an uniform and dense structure by the extrusion, and the microstructure became fine as the extrusion conducted repeatedly. The microstructural variation was known to be dependent on the number of extrusion and the area reduction ratio. The tensile strength was also measured as a function of the microstructural variation.

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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

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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Effects of Phase Fraction and Metallic Glass-Diamond Size Ratio on the Densification of Metallic Glass/Diamond Composite: Su-Min Shin, Taek-Soo Kim, Seung-Koo Kang, Jeong-Gon Kim; J Korean Powder Metall Inst. 2009;16(3):173-179.; DOI: https://doi.org/10.4150/KPMI.2009.16.3.173

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Abstract PDF: In the present study, Zr-base metallic glass(MG)/diamond composites are fabricated using a combination of gas-atomization and spark plasma sintering (SPS). The densification behaviors of mixtures of soft MG and hard diamond powders during consolidation process are investigated. The influence of mixture characteristics on the densification is discussed and several mechanism explaining the influence of diamond particles on consolidation behaviour are proposed. The experimental results show that consolidation is enhanced with increasing diamond/Metallic Glass(MG) size ratio, while the diamond fraction is fixed.

Finite Element Analysis of Densification of Mg Powders during Equal Channel Angular Pressing: Effect of Sheath: Seung-Chae Yoon, Taek-Soo Kim, Hyoung-Seop Kim; J Korean Powder Metall Inst. 2009;16(2):85-90.; DOI: https://doi.org/10.4150/KPMI.2009.16.2.085

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Abstract PDF: Magnesium and its alloys are attractive as light weight structural/functional materials for high performance application in automobile and electronics industries due to their superior physical properties. In order to obtain high quality products manufactured by the magnesium powders, it is important to control and understand the densification behavior of the powders. The effect of the sheath surrounding the magnesium powders on the plastic deformation and densification behavior during equal channel angular pressing was investigated in the study by experimental and the finite element methods. A modified version of Lee-Kim's plastic yield criterion, notably known as the critical relative density model, was applied to simulate the densification behavior of magnesium powders. In addition, a new approach that extracts the mechanical characteristics of both the powder and the matrix was developed. The model was implemented into the finite element method, with which powder compaction under equal channel angular pressing was simulated.

Analysis of Densification Behavior of Magnesium Powders in Extrusion using the Critical Relative Density Model: Seung-Chae Yoon, Hong-Jun Chae, Taek-Soo Kim, Hyoung-Seop Kim; J Korean Powder Metall Inst. 2009;16(1):50-55.; DOI: https://doi.org/10.4150/KPMI.2009.16.1.050

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Abstract PDF: Numerical simulations of the powder extrusion need an appropriate pressure-dependent constitutive model for densification modeling of the magnesium powders. The present research investigated the effect of representative powder yield function of the critical relative density model. We could obtain reasonable physical properties of pure magnesium powders using cold isostatic pressing. The proposed densification model was implemented into the finite element code. The finite element analysis was applied to simulation of powder extrusion of pure magnesium powder in order to investigate the densification and processing load at room temperature.

Effect of Spark Plasma Sintering on the Materials Properties of Water Atomized Al-Zn-Mg Alloy: Sun-Mi Kim, Taek-Soo Kim, Young-Do Kim, Jeong-Gon Kim; J Korean Powder Metall Inst. 2009;16(1):63-67.; DOI: https://doi.org/10.4150/KPMI.2009.16.1.063

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In order to investigate the effect of rapid solidification on the microstructure and the mechanical properties of Al-Zn-Mg system alloys, water atomization was carried out, since the water atomization beared the highest solidification rate among the atomization processes. The as atomized alloy powders consisted of fine grains less than 4 µm in diameter, and the second particles were not detected on XRD. The microstructure as solidified was maintained even after the spark plasma sintering at the heating rate of 50 K/min. On the other hand, lower rate of 20 K/min induced a formation of MgZn_2 particles, resulting in strengthening of the matrix. The density was almost constant at the temperature above 698K. The sintering temperature above 698K had no effect on the strength of the sintered materials.

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Fabrication of Ultra Fine Grained Molybdenum and Mechanical Properties
Se-Hoon Kim, Young-Ik Seo, Dae-Gun Kim, Myung-Jin Suk, Young-Do Kim
Journal of Korean Powder Metallurgy Institute.2010; 17(3): 235. CrossRef

Analysis of Densification Behavior during Powder Equal Channel Angular Pressing using Critical Relative Density Model: Cheon-Hee Bok, Ji-Hoon Yoo, Seung-Chae Yoon, Taek-Soo Kim, Byong-Sun Chun, Hyoung-Seop Kim; J Korean Powder Metall Inst. 2008;15(5):365-370.; DOI: https://doi.org/10.4150/KPMI.2008.15.5.365

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In this study, bottom-up powder processing and top-down severe plastic deformation processing approaches were combined in order to achieve both full density and grain refinement with least grain growth. The numerical modeling of the powder process requires the appropriate constitutive model for densification of the powder materials. The present research investigates the effect of representative powder yield function of the Shima-Oyane model and the critical relative density model. It was found that the critical relative density model is better than the Shima-Oyane model for powder densification behavior, especially for initial stage.

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Analysis of Densification Behavior of Magnesium Powders in Extrusion using the Critical Relative Density Model
Seung-Chae Yoon, Hong-Jun Chae, Taek-Soo Kim, Hyoung-Seop Kim
Journal of Korean Powder Metallurgy Institute.2009; 16(1): 50. CrossRef

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.

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.

Densification Behaviour of Magnesium Powders during Cold Isostatic Pressing using the Finite Element Method: Seung-Chae Yoon, Eun-Jeong Kwak, Won-Hyoung Choi, Hyoung-Kun Kim, Taek-Soo Kim, Hyoung-Seop Kim; J Korean Powder Metall Inst. 2007;14(6):362-366.; DOI: https://doi.org/10.4150/KPMI.2007.14.6.362

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Magnesium and magnesium alloys are promising materials for light weight and high strength applications. In order to obtain homogeneous and high quality products in powder compaction and powder forging processes, it is very important to control density and density distributions in powder compacts. In this study, a model for densification of metallic powder is proposed for pure magnesium. The mode] considers the effect of powder characteristics using a pressure-dependent critical density yield criterion. Also with the new model, it was possible to obtain reasonable physical properties of pure magnesium powder using cold iso-state pressing. The proposed densification model was implemented into the finite element method code. The finite element analysis was applied to simulating die compaction of pure magnesium powders in order to investigate the density and effective strain distributions at room temperature.

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Analysis of Densification Behavior of Magnesium Powders in Extrusion using the Critical Relative Density Model
Seung-Chae Yoon, Hong-Jun Chae, Taek-Soo Kim, Hyoung-Seop Kim
Journal of Korean Powder Metallurgy Institute.2009; 16(1): 50. CrossRef
Finite element analysis of the bending behavior of a workpiece in equal channel angular pressing
Seung Chae Yoon, Anumalasetty Venkata Nagasekhar, Hyoung Seop Kim
Metals and Materials International.2009; 15(2): 215. CrossRef

Characteristics of Plasma Electrolytic Oxidation Coatings on Mg-Zn-Y Alloys Prepared by Gas Atomization: Si-Young Chang, Han-Gyoung Cho, Du-Hyung Lee, Taek-Soo Kim; J Korean Powder Metall Inst. 2007;14(6):372-379.; DOI: https://doi.org/10.4150/KPMI.2007.14.6.372

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The microstructure, mechanical and electrochemical properties of plasma electrolytic coatings (PEO) coatings on Mg-4.3 wt%Zn-1.0 wt%Y and Mg-1.0 wt%Zn-2.0 wt%Y alloys prepared by gas atomization, followed by compaction at 320 for 10 min under the pressure of 700 MPa and sintering at 380 and 420 respectively for 24 h, were investigated, which was compared with the cast Mg-1.0 wt%Zn alloy. All coatings consisting of MgO and Mg_2SiO_4 oxides showed porous and coarse surface features with some volcano top-like pores distributed disorderly and cracks between pores. In particular, the surface of coatings on Mg-1.0 wt%Zn-2.0 wt%Y alloy showed smaller area of pores and cracks compared to the Mg-4.3 wt%Zn-1.0 wt%Y and Mg-1.0 wt%Zn alloys. The cross section micro-hardness of coatings on the gas atomized Mg-Zn-Y alloys was higher than that on the cast Mg-1.0 wt%Zn alloy. Additionally, the coated Mg-1.0 wt%Zn-2.0 wt%Y alloy exhibited the best corrosion resistance in 3.5%NaCl solution. It could be concluded that the addition of Y has a beneficial effect on the formation of protective and hard coatings on Mg alloys by plasma electrolytic oxidation treatment.

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The Aging Characteristics of Mg-6 wt.% Al-1 wt.% Zn Alloy Prepared by Gas Atomization
Du-Hyung Lee, Bo-Sik Kim, Si-Young Chang
Journal of Korean Powder Metallurgy Institute.2009; 16(4): 275. CrossRef

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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