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채홍준,김영도,이진규,김정곤,김택수,Chae, Hong-Jun,Kim, Young-Do,Lee, Jin-Kyu,Kim, Jeong-Gon,Kim, Taek-Soo 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.4
This work is to report not only the effect of rapid solidification of $MgZn_{4.3}Y_{0.7}$ alloys on the micro-structure, but also the extrusion behavior on the materials properties. The average grain size of the atomized powders was about $3-4{\mu}m$. The alloy powders of $Mg_{97}Zn_{4.3}Y_{0.7}$, consisted of I-Phase (Icosahedral, $Mg_{3}Zn_{6}Y_{1}$) as well as Cubic structured W-Phase ($Mg_{3}Zn_{3}Y_{2}$), 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.
채홍준,김영도,김택수,Chae, Hong-Jun,Kim, Young-Do,Kim, Taek-Soo 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.4
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 ${\mu}m$ 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.
채홍준,이진규,배정찬,김택수,Chae, Hong-Jun,Lee, Jin-Kyu,Bae, Jung-Chan,Kim, Taek-Soo 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.6
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.
채홍준(H. J. Chae),김택수(T. S. Kim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
In order to prohibit coarsening the microstructure during the powder sintering process, rapidly solidified Mg-Zn-Y alloy powders were consolidated using a magnetic pulsed compaction process. The effects of processing parameters such as discharging voltage and temperature on the microstructure, hardness, density and compressive strength were investigated. The experimental results showed that the density increased with increasing the voltage. Also, compaction temperature increases from 573K to 723K, the Mg-Zn-Y alloy showed more uniform structures, and these samples does not contain any pore, and the interface is well contacted, and showed the density of about 97% of theoretical value. Finally, the relative density and compressive strength of compacted specimens increase with the augmentation of temperature in the range investigated. However, the compacted samples showed the poor mechanical properties because there are nano-scale pore between Mg alloy powders.