Unrecrystallized layer and associated alloys and methods

B - Operations – Transporting – 32 – B

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Details

B32B 15/20 (2006.01) B32B 15/01 (2006.01) B32B 15/02 (2006.01) C22F 1/04 (2006.01)

Patent

CA 2473573

The present invention provides aluminium alloys (10) and layers (16, 18)formed in aluminium alloys (10) as well as methods for their manufacture. Aluminium alloys (10) of the present invention are provided with at least one discrete layer of uncrystallized grains (16, 18)formed therein. Alloys of the present invention can be formed, for example, by a process that includes a final partial anneal that permits softening of the material to essentially an O- temper condition. Processes of the present invention recrystallize substantially the entire material but leave a discrete layer of preferably less than 50 microns of the material unrecrystallized. In preferred embodiments, the aluminum material (10) is a core material that is clad on one or both sides (12, 14) and the discrete unrecrystallized layer (16, 18) forms at the boundary between the clad (12, 14) and the core (10).

La présente invention concerne des alliages d'aluminium (10) et des couches (16, 18) constituées de tels alliages d'aluminium (10), ainsi que des procédés de production de tels alliages et de telles couches. Les alliages d'aluminium (10) présentés sont pourvus d'au moins une couche séparée de grains non cristallins (16, 18) formés dans cette couche. Les alliages selon la présente invention peuvent être formés, par exemple, selon un procédé comprenant un recuit partiel final qui permet de ramollir le matériau jusqu'à ce qu'il prenne l'état O. Les procédés selon la présente invention entraînent une recristallisation de, sensiblement, tout le matériau mais laissent une couche séparée, représentant de préférence moins de 50 microns du matériau, non recristallisée. Dans des modes de réalisation préférés, le matériau à base d'aluminium (10) constitue le matériau central qui est recouvert sur un côté ou sur les deux côtés (12, 14), et la couche non recristallisée (16, 18) séparée forme l'interface entre le recouvrement (12, 14) et la partie centrale (10).

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