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김용길,김동훈 ( Yong Kil Kim,Tong Hoon Kim ) 한국주조공학회 1982 한국주조공학회지 Vol.2 No.1
N/A The present investigation was made to abtain a fine distribution of Pb Particles in AL - Pb binary alloys , which have a broad miscibility gap and large specific difference, by means of rapid Cooling of the molten alloys, Al-2.4% Pb, Al-5.5wt% Pb and Al-8.0wt % Pb alloy were used. The rapid cooling operation was performed by free falling of homogeneous liquid Al-Ph alloys into the water-cooled copper mold, and thermal analysis was made. Microstructures were observed, and variations of size and number of Pb particles were analysicle analyzer. By the result of examination with the varing cooling rates 100 to 210℃/sec fine distributions of Pb particles were obtained with high cooling rate. Under same cooling condition, the best rapid cooling effect was recognized in Al-5.5wt% Pb alloy.
Levitation 법으로 얻은 과냉도가 급냉응고 조직에 미치는 영향에 대한 연구 (1)
김동훈,김명호,김원태 대한금속재료학회(대한금속학회) 1985 대한금속·재료학회지 Vol.23 No.10
Microstructure of Al-2.98wt%Cr splats which were rapidly solidified by twin piston apparatus after levitation melting was analysed. Transitian of microstructure from microcrystalline to cellular or dendritic occurred with the increase of interface temperature, and monotectic-like reaction i.e. high cone. Liquidid→Intermetallic Compound+low conc. Liquid seemed to occur at cell or dendrite boundary. With the increase of superheating of liquid drop, the thickness of splats reduced possibly due to the available time for thinning of the splats in liquid state, however little difference in lattice parameter was observed. Microstructure of transverse section was varied with the distance from center to edge part of the disk type splats. Precipitate clusters of the rapidly solidified Al-Cr alloy were verified by selected diffraction pattern to be Al_(11) Cr₂, which was supposed to be nucleated and grown in supercooled liquid.