Glossary

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Many information can be found in aluminum-manual, which is being completely revised and will soon be available. In the meantime, please use our glossary for useful word explanations.

Sacrificial anode

Highly active metals that are used to prevent a less active material surface from corroding; sacrificial Anodes are created from a metal alloy with a more negative electrochemical potential than the other metal it will be used to protect.

Sandwich element

Semi-finished products in mostly plate form, which consists of two cover sheets and an intermediate layer, for example from various foams, with the aim of reducing weight without stiffness loss.

Secondary metal

Material that is obtained through recovery and treatment of metal which has undergone at least one manufacturing process.

Segregation

Separation that occurs in the melt during metal production; arises in the transition solid-liquid; different solubility of alloying elements in a solid or liquid state as well as different density are crucial.

Semi-finished products

General term to describe intermediate castings such as sheets, plates, rods, tubes, bars and coils.

Shear strength

Resistance of a material to tangential forces; strength of a material or component against the type of yield or structural failure where the material or component fails in shear.

Sheet metal

Flat rolling mill product made of metal.

Shrinkage porosity

Casting defect in which a micro-porous structure is formed in the last solidified places of the cast piece, mainly in materials with a longer solidification period.

Slug

Mostly circular piece of metal uniform thickness made of semi-finished products.

Soft annealing

Heat treatment of metals, to improve formability and material properties.

Solid solution

Mixture of two crystalline solids that coexist as a new crystalline solid, or crystal lattice.

Solidus line

Borderline in the phase diagram of an alloy, which separates the area of only solid phases from solid and liquid phases.

Solution annealing

First step of hardening; describes the increase in hardening attributable to foreign atoms (alloying elements) in the crystal lattice of aluminium.

Stabilization annealing

Hours-long heat treatment of castings at about 200-300 °C before mechanical processing to avoid volume and dimensional changes through precipitation processes.

Stress corrosion cracking

The occurrence of intergranular cracking under the action of an aqueous corrosion medium, usually containing chloride, and simultaneous mechanical tensile stress.

Surface treatment, chemical

Change to the surface properties by chemically aggressive media such as acids or alkalis.

Surface treatment, mechanical

Change to the surface properties by mechanical forces such as cutting or grinding.