A - Aluminium glossary

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Abrasives

Abrasives are grains of hard material (e. g. boron carbide or corundum) which are used as grinding materials. For this purpose they are often bound...

Additive

An additive is an admixture that is added to a substance in order to modify its chemical properties. Information on the chemical behaviour of...

Adhesive bonding

Adhesive bonding is the joining together of two metals or a metal and a non-metal using a thin layer of adhesive. The strength of the adhesive bond...

Adsorption dyening

During adsorption dyening (also dip dyeing), an aluminium part is immersed in a solution containing organic or inorganic dyes, which leads to a...

Advertorials

Advertorials are publications that appear in the information section of a publication or website as if they are part of the editorial content,...

Affinity

Affinity is the tendency of materials for a certain chemical reaction to occur or for certain elements to combine with each other.

Age hardening

Age hardening is an effective method of increasing strength, but it is only possible with age-hardenable alloys. If such alloys are subjected to...

Age-hardenable alloys

Alloys are said to be age hardenable if their tensile strength can be increased by heat treatment. Further information on the different types of...

Ageing

With aluminium alloys, foreign atoms that are part of the alloying constituents can precipitate out of solid solution as small particles. If such...

Alloy

An alloy is a mixture of the basis metal with one or more other so-called ‘alloying elements’, i.e. with other metallic or non-metallic substances....

Agenda 21

Agenda 21 is a programme of action that contains measures for tackling global development problems in the twenty-first century. Further information...

Aliting

The application of a protective coating with a high content of aluminium on other materials (particularly steel and iron). This coating is achieved...

Alkaline compounds

Alkalis are chemical compounds containing an alkali metal (lithium, sodium, potassium, rubidium, caesium or francium) and a hydrogen-oxygen ion, a so...

Alpha solid solution

An alpha solid solution is the name given to the solid solution that solidifies out first when an alloy melt cools down.

Alum

Alum is a chemical compound of aluminium and sulphur that occurs naturally and has been widely used for a broad range of applications since antiquity.

Aluminium

Aluminium is the most abundant metal in the earth’s crust. It is silvery white in colour, has a low density and is corrosion resistant. Aluminium was...

Alumina

Alumina is the term commonly used for aluminium oxide, a hard, high melting point mineral that is extracted from bauxite; aluminium is produced by...

Aluminium chloride

Aluminium chloride is a compound of aluminium and chlorine in the form of crystals that are readily soluble in water. It is mainly used as a catalyst...

Aluminium composites

Generally speaking, composites are materials that contain metallic, ceramic or polymeric components in the form of particles, fibres or layers....

Aluminium foam

Aluminium foam is strongly expanded (foamed) aluminium; it has a honeycomb structure and is thus highly porous. It is a particularly lightweight...

Aluminium paint

The term ‘aluminium paint’ is used to describe lacquers and coatings that contain aluminium powder as well as lacquer binders (mostly synthetic...

Aluminium powder

Aluminium powder is the finest available form of aluminium. The small, granular metal particles are silvery white in colour. Aluminium powder is...

Aluminium-melt tester

An aluminium-melt tester is a device used in a process for determining the hydrogen content of molten aluminium. It involves isolating a molten test...

Aluminothermy

Aluminothermy is a process for obtaining otherwise-difficult-to-extract metals with high melting points from their oxides. In this process, aluminium...

Alzheimer’s disease

Alzheimer’s disease involves a gradual and irreversible loss of memory that leads to a complete loss of perception of time and space, and, in a...

Anisotropy

Anisotropy is the term for the directionality of several physical and chemical properties of materials. In the case of metals anisotropy is due to...

Anode

An anode is a positively charged electrode. During electrolysis, negatively charged ions migrate to the anode during the dissociation process. The...

Anodising

Anodising is a process for increasing the thickness of the protective oxide layer on aluminium. The component to be anodised is immersed in an...

Arc stud welding

Stud welding aims at joining stud-shaped elements (e. g. bolts, sockets, hooks, eyes) permanently with larger components. For this purpose an arc...

Argon-helium inert gases

Inert gas mixtures on an argon-hélium basis are applied in welding to avoid oxidation of the materials in process. Compared to other gas mixtures...

Artificial ageing

Ageing generally is carried out as the final stage of a heat treatment. ‘Artificial ageing’ is the term used to describe ageing at temperatures of...

Atomic structure

The nucleus is at the centre of an atom; it contains almost all of the mass of the atom and the whole of its positive charge. It is made up of...

Autoclave

An autoclave is a vessel in which one can increase the pressure and temperature.

Automotive

Automotive is the generic term for any vehicle driven by its own power machine.

Axial processes

In material processing we denominate those machiningoperations as ‘axial’, which run into the direction of the tool’s axis of rotation. Examples for...