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김종찬,최정묵,권혁무 ( Jong Chan Kim,Jung Mook Choi,Hyuk Moo Kwon ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.1
N/A The spiral fluidity of Al-xSi/ySiC (x:6∼18 wt.%, y:3∼9 wt.%, particle size:l0∼28 ㎛) composites melt was investigated in this study. Addition of SiC particles to the base alloy decreased the fluidity of the Al-Si/SiC_p composites melt. The spiral fluidity (F) of the Al-Si/SiC_p composites melt was influenced more directly by the surface area of the SiC particles (S) dispersed in the molten AI-Si alloy, rather than the volume fraction or size of SiC particles and this could be expressed by following empirical regression equations. F=27.269-0.011S (pouring temp.: 750˚C) at AI-6wt.%Si/SiC_p, F=41.635-0.019S (pouring temp.: 750˚C) at Al-18wt.%Si/SiC_p. The spiral fluidity of hypereutectic Al-Si/SiC_p composites melt increased with increaes in pouring temperature of the melt. However, the spiral fluidity of hypereutectic AI-Si/SiC_p composites melt did not increase significantly when the pouring temperature was increased above 780˚C (Received December 1, 1997)
열처리 및 단조조건에 따른 알루미늄 6056 소재의 특성변화 및 자동차의 피스톤 블록 설계
김민석,정병덕,박효영,최정묵,김정민,박준식,Kim, Min Seok,Jung, Hyung Duck,Park, Hyo young,Choi, Jeong Mook,Kim, Jeong Min,Park, Joon Sik 한국재료학회 2015 한국재료학회지 Vol.25 No.10
The mechanical properties and microstructures of Aluminum 6056 alloys were investigated for their use in the fabrication of a piton block. The EN-AW6056 alloys exhibited a tensile strength of 375 MPa for a solution treatment temperature of $550^{\circ}C$ for 2 h followed by an aging treatment at $190^{\circ}C$ for 4 h. The microstructures of the heat treated specimen showed that the $Mg_2Si$ phase with a size of 3~5 um was dispersed throughout the aluminum matrix when the heat treatment was done. Moreover, in order to identify the forgeability of the specimen, upsetting tests were done. For up to 80 % of the upsetting ratio, the specimen maintained its original shape, and at above 80 % of the upsetting ratio, the specimen underwent crack development. The specimen was successfully forged without any defects with the examined material conditions. The material conditions together with the forging conditions are discussed in terms of the microstructures and mechanical properties.
지방조직의 Stromal Vascular Fraction에서 다양한 분화방법에 따른 지방세포로의 분화
김민경 ( Min Kyung Kim ),박용순 ( Yong Soon Park ),박희순 ( Hee Soon Park ),최정묵 ( Jung Mook Choi ),김원준 ( Won Jun Kim ),박세은 ( Se Eun Park ),이은정 ( Eun Jung Rhee ),박철영 ( Cheol Young Park ),이원영 ( Won Young Lee ),오 한국지질동맥경화학회(구 한국지질학회) 2009 韓國脂質學會誌 Vol.19 No.3