Question

State the main components of the duralumin.

Answer 1

Duralumin is also known as Duraluminium which is an alloy. Duralumin is a trade name of earlier alloys in which one metal is aluminum. Duralumin was first developed by a German metallurgist Alfred Wilm in$1910$.

Complete answer:
We know that duralumin is a strong and hard metal alloy. It contains aluminium as it’s main component.
Aluminium presents in duralumin as a percentage of $91\% - 95\%$. The other main and important metals present in duralumin are copper $\left( {3.8\% {\text{ }} - {\text{ }}4.9\% } \right)$and magnesium $\left( {1.2\% {\text{ }} - {\text{ }}1.8\% } \right).$
But there are some other metals also present in duralumin but in very very small amount.
Now we will like to see the chemical composition of metals in duralumin:

Aluminium	$91\% {\text{ }} - {\text{ }}95\%$
Copper	$3.8\% {\text{ }} - {\text{ }}4.9\%$
Magnesium	$1.2\% {\text{ }} - {\text{ }}1.8\%$
Manganese	$0.3\% {\text{ }} - {\text{ }}0.9\%$
Iron	$0.5\%$
Silicon	$0.25\%$

Other metals like zinc, titanium, chromium are altogether $0.25\%$

Properties of duralumin-
1. It is strong and lightweight.
2. It is soft and ductile and brittle.
3. It can tolerate a good amount of tensile strength.

Now we know that duralumin is a lightweight metal alloy which is relatively soft and ductile. Because of this, duralumin can be rolled, forged and extruded into various forms and products. The main benefit of using duralumin is that this metal alloy is workable under normal temperature.

The answer is, option (B).

Note: Applications of Duralumin:
1. Duralumin is mainly used to make aircraft frames.
2. It is used to manufacture frames of speedboats and automobiles.
3. It is used in surgical instruments.
4. It is used as manufacturing components of various measuring instruments.