Aluminium alloy containing magnesium and silicon

C - Chemistry – Metallurgy – 22 – F

Patent

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C22F 1/05 (2006.01)

Patent

CA 2361760

The invention relates to a heat treatable Al-Mg-Si aluminium alloy which after shaping has been submitted to an ageing process, wherein the ageing after cooling of the extruded product is performed in a first stage in which the extrusion is heated with a heating rate above 30°C/hour to a temperature between 100 - 170°C, a second stage in which the extrusion is heated with a heating rate between 5 and 50°C/hour to the final hold temperature between 160 and 220°C and in that the total ageing cycle is performed in a time between 3 and 24 hours.

La présente invention concerne un alliage d'aluminium Al-Mg-Si apte au traitement thermique qui après formage a été soumis à un procédé de vieillissement, dans lequel le vieillissement suivant refroidissement du produit de l'extrusion est effectué dans une première étape lors de laquelle l'extrusion est chauffée à une vitesse d'élévation de température supérieure à 30 DEG C/heure jusqu'à une température comprise entre 100 et 170 DEG C, une deuxième étape lors de laquelle l'extrusion est chauffée avec une vitesse d'élévation de température comprise entre 5 et 50 DEG C/heure jusqu'à une température finale de maintien comprise entre 160 et 220 DEG C et le cycle total d vieillissement s'effectue en une durée comprise entre 3 et 24 heures.

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