The machinability of aluminium increases when _________ is added to aluminium.
A. Copper
B. Magnesium
C. Silicon
D. Lead and bismuth
Answer: Option D
Solution(By Examveda Team)
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.
This Question Belongs to Mechanical Engineering >> Engineering Materials
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