Method for aging 7000 series aluminium

C - Chemistry – Metallurgy – 22 – F

Patent

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C22F 1/053 (2006.01)

Patent

CA 2441168

This invention relates to a method for artificially aging 7000 Series Al aerospace alloys to impart improved strength and/or corrosion resistance performance thereto. The method purposefully adds a second aging step or stage to a one-step tempering, or a third step/stage to a low-high, two-step aging operation. The added step/stage extends at about 225-275~ F for about 3-24 hours. More preferably, the added stage extends at about 250~ F for about 6 hours or more.

L'invention concerne un procédé destiné au vieillissement artificiel d'alliages aérospaciaux d'aluminium de la Série 7000 pour les rendre plus solides et/ou plus résistants à la corrosion. Ce procédé consiste à ajouter volontairement un deuxième palier/étape de vieillissement au revenu à un seul palier, ou un troisième palier/étape à une opération de vieillissement à deux paliers, faible et élevé. Le palier/étape ajouté est effectué à une température comprise entre 225-275 ·F environ pendant 3 à 24 heures environ. De préférence, le palier supplémentaire est effectué à 250 ·F environ pendant au moins 6 heures.

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