- Fabrication and Dynamic Consolidation Behaviors of Rapidly Solidified Mg Alloy Powders
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Hong-Jun Chae, Young-Do Kim, Taek-Soo Kim
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J Korean Powder Metall Inst. 2011;18(4):340-346.
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DOI: https://doi.org/10.4150/KPMI.2011.18.4.340
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- 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.
- Consolidation and Mechanical Behavior of Gas Atomized MgZn4.3Y0.7 Alloy Powders using High Pressure Torsion
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Eun-Yoo Yoon, Hong-Jun Chae, Taek-Soo Kim, Chong-Soo Lee, Hyoung-Seop Kim
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J Korean Powder Metall Inst. 2010;17(3):190-196.
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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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Citations
Citations to this article as recorded by  - 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
- Analysis of Densification Behavior of Magnesium Powders in Extrusion using the Critical Relative Density Model
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Seung-Chae Yoon, Hong-Jun Chae, Taek-Soo Kim, Hyoung-Seop Kim
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J Korean Powder Metall Inst. 2009;16(1):50-55.
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DOI: https://doi.org/10.4150/KPMI.2009.16.1.050
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- 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.
- Extrusion Behavior of Gas Atomized Mg Alloy Powders
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Hong-Jun Chae, Young-Do Kim, Jin-Kyu Lee, Jeong-Gon Kim, Taek-Soo Kim
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J Korean Powder Metall Inst. 2007;14(4):251-255.
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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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Citations
Citations to this article as recorded by - 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
- Materials Properties of Gas Atomized and Extruded Mg-Zn-Y Alloys
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Hong-Jun Chae, Jin-Kyu Lee, Jung-Chan Bae, Taek-Soo Kim
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J Korean Powder Metall Inst. 2006;13(6):427-431.
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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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Citations
Citations to this article as recorded by - 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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