Verfahren zur Wärmebehandlung einer Legierung auf Aluminiumgrundlage

摘要

Resistance to stress corrosion cracking is effected without noticeable reduction in strength or weight penalties by heating Al alloy contg. Cu, Mg and Zn to 460-477 degrees C for time sufficient to allow constituents to enter into solid soln., quenching with water and ageing by (a) first heating to 96-107 degrees C for 6-10 hrs., and then (b) to 149-193 degrees C for 2-48 hrs. Pref. alloy is cooled to room temp. before last heating step. Pref. (b) ageing step takes place by heating to 157-179 degrees C for 4-18 hrs.