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.

Patterning: Rolling of aluminium strips with specially structured embossing rollers.
Pearl string: Thermally activated dissolution of contiguous precipitation strips on the grain boundaries – arrange into separate, punctiform precipitations distributed like a string of pearls at the grain boundaries.
pH-value: Measure of the strength of the acid or alkaline effect of an aqueous solution.
Pig: Intermediate metal product supplied to smelting plants.
Plastic deformation: Permanent deformation or change in shape of a solid body without fracture under the action of a sustained force.
Plating: Applying a higher quality metal layer on a different metal or alloy; an insoluble connection is created by temperature and pressure application.
Pollution: Non-metallic or metallic elements that are not deliberately added to the base metal or are included as admixture.
Polygonisation: Polygonization is the process of rearranging excess edge dislocations into low-angle tilt boundaries – metallurgical process.
Pores: Circular cavities in the metal, which can be caused by too high gas content in the melt or shrinkage during solidification.
Precipitation: Alloying components not dissolved in the basic matrix.
Press effect: Manifests itself in the extrusion of profiles and rods from heat treatable aluminium alloys in the increase of the Rp0.2 boundary and the tensile strength Rm and a reduced elongation at break A5 in the direction of the axis of staff; it can be reinforced by recrystallization-resistant alloy additions.
Pressure test: Destructive material test to determine the mechanical parameters; reversal of the tensile testing.
Primary aluminium: Primary aluminium; produced directly from bauxite.
Primary metal: Material obtained by reduction or dissolution of a compound.
Profile: Longitudinal product with uniform cross-section over its entire length.
Pultrusion: Metal passes through a die block by a pulling force on the metal outlet side.
Pure aluminium: Aluminium of high purity with an Al content of 99.95% and more.