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플라즈마 전해산화공정을 이용한 Mg<sub>95</sub>Zn<sub>4.3</sub>Y<sub>0.7</sub> 합금분말 성형체의 표면특성제어
김재호,최한신,김도향,황덕영,김형섭,김택수,Kim, J.H.,Choi, H.S.,Kim, D.H.,Hwang, D.Y.,Kim, H.S.,Kim, T.S. 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.2
The investigation is to modify the mechanical and chemical properties of Mg alloys using a combination of rapid solidification and surface treatment. As the first approach, $Mg_{95}Zn_{4.3}Y_{0.7}$ was gas atomized and pressure sintered by spark plasma sintering process (SPS), showing much finer microstructure and higher strength than the alloys as cast. Further modification was performed by treating the surface of PM Mg specimen using Plasma electrolytic oxidation (PEO) process. During the PEO processing, MgO layer was initiated to form on the surface of Mg powder compacts, and the thickness and the density of MgO layer were varied with the reaction time. The thickening rate became low with the reaction time due to the limited diffusion rate of Mg ions. The surface morphology, corrosion behavior and wear resistance were also discussed.
Al-Si 이원계 합금의 응고현상에 미치는 정수압의 영향 (1) - 금속 조직적 연구 -
한요섭,김도향,이호인 ( Y . S . Han,D . H . Kim,H . I . Lee ) 한국주조공학회 1986 한국주조공학회지 Vol.6 No.2
The effects of pressure during solidification on macro-and micro-structures have been studied in pure aluminium and Al-Si alloys. The application of pressure during solidifcation accelerated both equiaxed and columnar dendritic-growth due to stimulating of equiaxed survival and faster preferential growth of primary dendrites against the parallel direction of heat flow. Burden-Hunt model was modified to express the significant changes of CET behaviours under pressure. A further point to be noted was that greatly fine eutectic silicon flakes (0.5×13㎛) with the decrease of halo layers (7㎛) of aluminium riched phases in the periphery of primary silicon particles were observed when pressure was applied during solidification.
김상혁,김도향,이종수,박찬경,Kim, S.H.,Kim, D.H.,Lee, J.S.,Park, C.G. 한국현미경학회 1996 Applied microscopy Vol.26 No.2
Amophization and decomposition behaviour in $Mg_{62}Cu_{26}Y_{12}$ alloy prepared by melt spinning method and wedge type metal mold casting method have been investigated by a detailed transmission electron microscopy. Amorphous phase has formed in melt-spun ribbon. In the case of the wedge type specimen, however, the amorphous phase has formed only around the tip area within about 2 mm thickness. The remaining part of the wedge type specimen consists of crystalline phases, $Mg_{2}Cu\;and\;Cu_{2}Y$. The supercooling for crystallization behaviour of the amorphous $Mg_{62}Cu_{26}Y_{12}$ alloy, ${\Delta}T_x$ has been measured to be about 60 K. Such a large undercooling of the crystallization bahaviour enables formation of the amorphous phase in the $Mg_{62}Cu_{26}Y_{12}$ alloy under the cooling rate of $10^{2}K/s$. The amorphous $Mg_{62}Cu_{26}Y_{12}$ has decomposed into crystalline phases, $Mg_{2}Cu\;and\;Cu_{2}Y$ after heat treatment at $170^{\circ}C\;and\;250^{\circ}C$.