Question

Monel metal is an alloy of Cu, Ni, and Fe.
A. True
B. False

Answer 1

Hint: Monel alloy \[400\] is known to be a binary alloy having the same proportions of nickel and copper as it is found naturally in the meteoritic nickel ore. They were created by Robert crooks Stanley in \[1901\].

Complete step by step answer:
Monel metals is basically a group of alloys, mainly composed of nickel which is almost from \[52\% - 67\% \] and copper, with a very small amount of iron (Fe), carbon (C) and silicon (Si). Alloys with copper contents that is upto \[60\% \] or more are called cupronickel.
Hence from the statement above it is clear the answer is true.

Additional information:
It is a very solid solution of binary alloy. As nickel and copper are soluble in all the proportions, it is known as single phase alloy. In comparison to steel, monel is highly difficult to machine as it hardens very quickly. It should be turned and worked at slow speeds and low feed rates. The most common use of it is in application with highly corrosive conditions. When there is a small addition of aluminium and titanium it forms an alloy with the same resistance but with much greater strength due to formation of gamma prime on aging.

Note: It is a costly alloy, hence its use limits to applications where it cannot be replaced with another alternative. These alloys are very resistant to corrosion by many agents including rapid flow of seawater. They can be fabricated by hot and cold working, and welding.