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pISSN : 1598-706X / eISSN : 2288-8381


한국주조공학회지 (37권4호 108-114)

Change of Secondary Dendrite Arm Spacing of Hypoeutectic Al-Si Alloys according to Si Content and Cooling Rate

아공정 Al-Si 합금에서 Si 함량과 냉각속도에 따른 제이차수지상간격의 변화

Kyeong-Seob Park and Hee-Soo Kim†

Department of Materials Science and Engineering, Chosun University,



In this study, we investigated the effect of the Si content on the secondary dendrite arm spacing (SDAS) of hypoeutectic Al-Si binary alloys in the range of 4~10 wt% Si. Cooling curves were measured during the solidification of the alloy cast in a step-wise mold. We compared two kinds of solidification time: the first is the total solidification time for both dendritic and eutectic growth, and the second is the solidification time for only dendritic growth. The proportional constant in the relationship between SDAS and cooling rate was estimated, as this constant represents the stability of the cast microstructure. The proportional constant decreased with the Si contents from 4 wt% to 8 wt%, and it remains relatively uniform with up to 10 wt% of Si.


Al alloys, Solidification, Dendritic growth, Cooling rate, Alloy design