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http://dx.doi.org/10.7777/jkfs.2017.37.4.108

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

Park, Kyeong-Seob (Department of Materials Science and Engineering, Chosun University)
Kim, Hee-Soo (Department of Materials Science and Engineering, Chosun University)
Publication Information
Journal of Korea Foundry Society / v.37, no.4, 2017 , pp. 108-114 More about this Journal
Abstract
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.
Keywords
Al alloys; Solidification; Dendritic growth; Cooling rate; Alloy design;
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