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

Natural ageing

Step in the heat treatment where the metal is removed from the quench bath and allowed to gain its full strength at room temperature (previous solution annealing and quenching necessary; treatment only for heat treatable alloys).

Naturally hard

Not heat treatable, i.e. an increase in strength is possible only through cold forming.

Non heat treatable alloy

Alloy whose strength can only be increased only by forming.

Notched impact strength

A measure for resistance of metal against sudden stress.