The machinability of aluminium increases when _________ is added to aluminium.

The machinability of aluminium increases when _________ is added to aluminium. Correct Answer Lead and bismuth

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.
Bissoy MCQ

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