Question

The composition of duralumin is
A) \[\text{Al 94 }\!\!%\!\!\text{ Mg6 }\!\!%\!\!\text{ }\]
B) \[\text{Cu 56 }\!\!%\!\!\text{ MZn 24 }\!\!%\!\!\text{ Ni 20 }\!\!%\!\!\text{ }\]
C) \[\text{Cu 95 Al 5 }\!\!%\!\!\text{ }\]
D) \[\text{Al 95 }\!\!%\!\!\text{ , Cu 4 }\!\!%\!\!\text{ , Mn 0}\text{.5 }\!\!%\!\!\text{ Mg 0}\text{.5 }\!\!%\!\!\text{ }\]

Answer 1

Hint: An alloy is generally a combination of metals or metals combined with one or more other elements. An alloy usually crystallizes upon cooling into a solid solution, mixture, or intermetallic compound. Duralumin Is an alloy which is a combination of metals combined with one or more other elements and its main component is Aluminium. Metal alloys are generally used to enhance mechanical and chemical properties.

Complete answer:
An alloy is the mixture or combination of metal, metals can be combined with one or more than elements.
As duralumin is an alloy of Aluminium it contains the maximum amount of aluminum in the composition with the aluminium, 3 other elements are also present in it is the 4% copper, 0.5% manganese, 0.5% magnesium and rest is aluminium. It is mostly used in aircraft designing and were rods for the screw machine.
As by mixing a little amount of copper in aluminium, it makes the aluminium some hard and then widely used in wheels’ space booster.In future it is used in Aircraft structure auto body panels

Note: Pure metals possess a few important physical and metallic properties, such as melting point, boiling point, density, specific gravity, high malleability, ductility, heat and electrical conductivity and other properties. We can modify and enhance these properties by alloying it with some other metal or nonmetal.
Alloys are usually made for the following purposes: to enhance the hardness of a metal, to lower the melting point, to enhance tensile strength, to enhance corrosion resistance, alloying a metal also increases the inertness, towards any reaction, of the metal, which in turn increases corrosion resistance, to modify color and to provide better castability.