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유연철,전정식,한형기 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.5
In order to investigate the microstructures of Al-(0.8, 1.3, 3)wt%Fe alloys, solidification processes were performed with water-cooled mold, air-cooled mold and in furnace. The intermetallic particles of these alloys were analyzed by X-ray diffraction, transmission electron microscopy and energy dispersive X-ray spectroscopy. The eutectic structure between Al and Al_6Fe particles was dominant and a few Al₃Fe particles were observed as cooling rate increased. With the increasing Fe contents and cooling rate, the formation of microcellular structures of Al grains largely containing globular or rod-liked Al_6Fe intermetallic precipitates were predominant. The crystallographic orientation relationships between Al matrix and particles were identified as [2(33) ̄]_(Al)//[(11) ̄0]_(Al₃Fe), ((311) ̄)_(Al)//(2(22) ̄)_(Al_6Fe), (011 ̄)_(Al)//(001)_(Al_bFe) and [1 ̄12]_(Al)//[010]_(Al₃Fe). The Al-Fe alloy exibited goad thermal stability and appreciable strength up to 450℃. The results indicate that high solidification rate is necessary to obtain high temperature strength Al-Fe alloy.
Al-(0.6, 1.3) wt % Fe 합금의 고온변형 및 조직에 관한 연구
이호인,유연철,전정식,한형기 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.2
High temperature dynamic softening characteristics related to microstructures have been examined for Al-(0.6, 1.3)wt%Fe alloys deformed in torsion at temperatures between 300℃ and 500℃, and at strain rates of 2.65×10^(-2)/sec to 1.2/sec. The flow stress as a function of strain rose to a maximum value then gradually decreased towards a steady state deformation. The effect of temperature on the flow stress was more pronounce than that of strain rate in this experimental range. The high temperature restoration mechanism was found to be dynamic recrystallization(DRX). From the relations between flow stresses and microstructures including intermetallic compounds at specific points on a flow curve, it can be assumed that the intermetallic compounds promoted dynamic recrystallization and prohibited grains from growing during the high temperature deformation. The relation between Zenner-Hollomon parameter, Z, and the microstructure was also studied and the equiaxied DRX grains were shown at low value of Z range.