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Formation and Microstructure Characteristics of $\beta-Al_5FeSi$ Intermetallic Compound in the Al-Si-Cu Alloys with the Variation of Fe Content  

Kim, Bong-Hwan (Liquid processing & casting technology R/D division, Korea Institute of Industrial Technology)
Lee, Sang-Mok (Liquid processing & casting technology R/D division, Korea Institute of Industrial Technology)
Publication Information
Journal of Korea Foundry Society / v.29, no.5, 2009 , pp. 225-232 More about this Journal
Abstract
For comprehensive understanding of the formation behavior of $\beta-Al_5FeSi$ phase in Al-Si-Cu alloys with the existence of Fe element, microstructure characterizations were performed using combined analysis of OM, SEM-EDS, XRD. Especially, experimental and predictive works on solidification events of $\beta-Al_5FeSi$ phase as well as other phases formed together with $\beta-Al_5FeSi$ have been carried out by using DSC analysis and Java-based Materials Properties software (J. Mat. Pro.). Primary and eutectic $\beta-Al_5FeSi$ phases were able to distinguish from each other on microstructures by their morphological features. Primary $\beta-Al_5FeSi$ phase was seen to have rough surface perpendicular to growth direction, indicating free attachment of solute atoms in liquid state. On the other hand, the eutectic $\beta-Al_5FeSi$ phase was formed with plain and straight surface during eutectic reaction together with $\alpha$-Al phase. The eutectic reaction of $\beta-Al_5FeSi$ and $\alpha$-Al phases was seen to be able to separate into each formation depending on cooling rate.
Keywords
Al-Si-Cu; $\beta-Al_5FeSi$; Intermetallic; Morphology; Growth behavior; Fe content; Cooling rate;
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Times Cited By KSCI : 2  (Citation Analysis)
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