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______ is added to aluminum bronze to increase strength and hardness.

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______ is added to aluminum bronze to increase strength and hardness.

(a) Nickel

(b) Lead

(c) Iron

(d) Silicon

The question was asked in a national level competition.

This key question is from Copper and its Alloys in chapter Non Ferrous Materials of Engineering Material & Metallurgy

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Correct choice is (c) Iron

The explanation is: Aluminum bronzes are used for making gears, propellers, cams, and other parts which require good strength and hardness. Therefore, iron is added to aluminum to achieve this result. The composition of iron is 3.5%, with the remaining being 89% copper, 7% aluminum, and 0.35% tin.

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