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Which among the following type is named when the silicon content is 12% in an aluminum alloy?

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Which among the following type is named when the silicon content is 12% in an aluminum alloy?

(a) Eutectic

(b) Hyper-eutectic

(c) Hypo-eutectic

(d) Pearlite

I got this question in exam.

My query is from Engine Components in division Basic Engine Components of Automotive Engine Design

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Correct option is (a) Eutectic

To elaborate: Aluminum alloy containing silicon when increased leads to a decrease in its coefficient of expansion. Presently two alloy with silicon content 12%(eutectic) and 22% (hyper-eutectic) are being used, which have less coefficient of expansion to that of aluminum.

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