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The machinability of aluminium increases when is added to aluminium

This question belongs to Mechanical Engineering Engineering Materials
Engineering Materials
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The machinability of aluminium increases when _________ is added to aluminium.

Answer & Solution
Correct Answer: Option D
The low-melting-point metals such as bismuth, lead, tin, and cadmium are added to aluminum to make free-machining alloys.
lead is added at about the 0.5% level with the same amount as bismuth in some alloys to improve machinability.
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