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Effect of micro solidification rate on mechanical response in as Cast A356 alloy

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Document pages: 11 pages

Abstract: The narrow range of secondary dendrite arm spacing (SDAs) in as Cast A356 alloy with and without copper (Cu) was studied. Cu was added to the base A356 alloy melt to achieve target concentrations of 0.5 and 1 wt. . Select samples from 3 different positions in the casting plate and provide 30, 35 and 40 samples   μ MSDAs variant. The tensile curve shows that there is a great influence between the cutting position and the strength of the sample, which is obvious in the copper containing alloy. The tensile response was not confirmed by hardness measurement; Therefore, in order to understand this phenomenon, we studied the microstructure characteristics in detail. From the top (T) to the bottom (b) of the casting, the equivalent diameter (ED) size of eutectic silicon (SI) particles decreases. Eutectic Si particle surface area (A ) was found to be denser at the B as compared to the T and simultaneously in the Cu-containing alloy as compared to the Cu-free reference alloy. Backscattered electron (BSE) images were employed to investigate the nature of the Cu-rich intermetallic phases. In conclusion, electrical conductivity measurements were performed to confirm the trends observed.

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