D - Aluminium glossary

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Davy, Sir Humphry

Humphry Davy (1778-1829), a British natural scientist, isolated aluminium metal in 1807 and was thus the first person to prove its existence. It was...

Deep drawing

Deep drawing is one of the most important forming processes for sheet. It is a planiform forming process in which a hollow shape open on one side is...

Density

One of aluminium’s most important properties is its low density. It contributes strongly to the wide range of possible methods of processing the...

Deoxidation

The term ‘deoxidation’ is used to describe a process in which oxygen is removed from a chemical compound. Aluminium is used for this purpose during...

Detonation spraying

Detonation spraying is a coating process that uses hard metallic or non-metallic substances, mainly carbides or oxides. Carefully measured volumes of...

Dialysis

Patients that suffer from a so-called ‘kidney deficiency’ (insufficient or non-functioning of the kidneys) have to undergo regular, artificial...

Die

The term die is used to describe a shape-forming tool through which metal is forced during extrusion or cold impact extrusion. The die shape...

Diffusion

The term ‘diffusion’ refers to the fact that atoms in the microstructure of a metal acquire a certain mobility above a certain temperature and...

Digestion

Digestion is the name given to the process by which sodium aluminate is leached from bauxite using a caustic soda solution (as part of the Bayer...

Direct chill casting

Direct chill casting (or continuous casting) is used to produce rolling ingots and extrusion billets. The casting device comprises a water-cooled...

Direct extrusion

Direct extrusion is the most simple form of extrusion; an extrusion billet that has been heated to about 450–500 °C is placed in a container and...

Direct impact extrusion

Direct impact extrusion is a form of cold impact extrusion. The blank is first upset in the cavity immediately in front of the die in order to fill...

Direct impact extrusion of cup-shaped sections

Direct impact extrusion of cup-shaped sections is a form of cold impact extrusion. In this process, as is the case with indirect impact extrusion of...

Direct impact extrusion of hollow shapes

Direct impact extrusion of hollow shapes is a form of cold impact extrusion. A blank is made into a shell with a certain wall thickness. The internal...

Directional solidification

Generally speaking, the term directional solidification is used to describe an ordered arrangement of atoms at the solidification front, especially...

Dislocations

Dislocations are defects in the regular atomic arrangement of the crystal lattice. If force is applied, such dislocations can move along special slip...

Dispersion coating

Dispersion coating (lat.: dispergere= disperse) is a surface treatment aimed at increasing wear resistance. Hard materials, such as metal carbides or...

Drawing

Drawing is a metalworking process in which a pre-shaped blank is drawn through a die; it is used to manufacture accurately dimensioned aluminium wire...

Drawing stock

Drawing stock is an intermediate product that is subsequently cold drawn to normal wire. The cross-section of drawn stock is consistent over the...

Ductility

‘Ductility’ is a term used to describe the ability of a material to deform plastically without fracturing.