H - Aluminium glossary

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Hall, Charles Martin

Charles Martin Hall, an American chemist (1863-1914), discovered fused-salt electrolysis in 1886 at the same time as the Frenchman Paul Louis Héroult...

Hard anodising

Hard anodising is a procedure for the fortification of the protecting oxide layer of aluminium by the electrolytic oxidation of aluminium materials....

Heat of fusion

The heat of fusion is a physical property that indicates how much thermal energy is required to transform 1 kg of a substance at its melting point...

Heat of solidification

The heat of solidification is physical parameter that expresses how much energy is released when a kilogram of a material solidifies from the liquid...

Heat treatment

Heat treatment describes all those measures that are deliberately used to change the properties of a material by altering its structure at elevated...

Hedging

Hedging means obtaining cover for future commitments in physical metal; one enters into a reciprocal agreement for the same quantity on the same date...

Héroult, Paul Louis Toussaint

Paul Louis Héroult, a French engineer (1863-1914), discovered fused-salt electrolysis in 1886 at the same time as the American Charles Martin Hall;...

High-temperature strength

The high-temperature strength is a measure of the strength of a metal at elevated temperatures.

Hollow profiles

Hollow profiles are profiles with one or more completely closed cavities. Further information on hollow profiles

Homogenising

Homogenising is a form of heat treatment that equalises out any local depletions or concentrations of foreign atoms in the structure that result from...

Hot cracking

Hot cracks can occur during the final stages of solidification of a work piece if the temperature is near to the melting point. It is a process where...

Hot rolling

Hot rolling is usually the first of two rolling stages: strip some 3-8 mm thick – so-called ‘hot strip’ – is produced in the hot mill of a rolling...

Hot-top casting

Hot-top casting is a special form of direct chill casting which differs from the conventional process in the way the strand is cooled and the core...

Hybrid joining

Hybrid joining is a combination of several joining procedures. Metallic components are mechanically – for example with welding spots – and with...

Hydrostatic extrusion

Hydrostatic extrusion is a form of extrusion in which the extrusion pressure is applied via a hydrostatic medium (oil or water). The extrusion billet...

Hypereutectic alloy

A hypereutectic alloy contains more of the alloying constituent than the eutectic composition. The alloying constituent forms the primary crystals...

Hypoeutectic alloy

A hypoeutectic alloy contains less of the alloying constituent than the eutectic composition. In such an alloy, the fraction of the eutectic in the...