Minor element effects of bismuth and phosphorus on the microstructural characteristics of A356.2 aluminum alloy were investigated. The results showed that effective modification of the eutectic structure using additions of 0.015 percent Sr was counteracted with increased bismuth and phosphorus contents. With increased amounts of bismuth and phosphorus, from 0.005 to 0.05 percent and from 0.001 to 0.01 percent, respectively, the modification effect of strontium was continuously nullified. No interaction between bismuth and phosphorus was observed in the microstructures, it was, therefore, concluded that bismuth and phosphorus act individually in A356.2 alloy to counteract the modification effect of strontium.
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