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Addition of zinc to gun metals results in ______

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Addition of zinc to gun metals results in ______

(a) Improved fluidity

(b) Increased machinability

(c) Increased castability

(d) Improved toughness

This question was addressed to me in exam.

This intriguing question originated from Copper and its Alloys topic in division Non Ferrous Materials of Engineering Material & Metallurgy

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The correct choice is (a) Improved fluidity

The explanation is: Gunmetal, when added with zinc, improves fluidity during casting and also acts as a deoxidizer. Since zinc is cheaper than tin, it also results in a decrease in overall cost. Increased machinability and castability are due to the addition of lead.

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