Aluminium as used in Aircraft.
Aluminium is used to make many parts of aircraft. This is mainly because of its weight, which is considerably lighter than the next suitable material steel. This is not its only reason for being used otherwise we could have used plastic or something even lighter. Its internal properties on a molecular level make it the lightest suitable material which would retain a good strength.
Aluminium can be easily made into forms such as foil, sheets, shapes, rods, tubes, and wires. It also displays excellent machinability and plasticity in bending, cutting, and drawing. Aluminium is considered to be the best material for complex-sectioned hollow extrusion this means that it would generally be easier to work with than materials such as Steel. Hollow extrusions are used in aircraft for building internal structures, such as deck supports. Aluminium is very resistant comparatively to high stress. It is capable of absorbing it. An aircraft during flight is particularly exposed to high stress mainly due to the weight of the wings on the body. If another lighter material was used it is likely that airframe failure would occur meaning it would crash most likely as soon as it turned.
