한국주조공학회

For comprehensive understanding of the formation behavior of β-Al5FeSi 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 β-Al5FeSi phase as well as other phases formed together with β- Al5FeSi have been carried out by using DSC analysis and Java-based Materials Properties software (J. Mat. Pro.). Primary and eutectic β-Al5FeSi phases were able to distinguish from each other on microstructures by their morphological features. Primary β- Al5FeSi 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 β-Al5FeSi phase was formed with plain and straight surface during eutectic reaction together with α-Al phase. The eutectic reaction of β-Al5FeSi and α-Al phases was seen to be able to separate into each formation depending on cooling rate.

Al-Si-Cu, β-Al5FeSi, Intermetallic, Morphology, Growth behavior, Fe content, Cooling rate.