Aluminum alloy sheet excellent in resistance to softening by...

C - Chemistry – Metallurgy – 22 – C

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C22C 21/06 (2006.01)

Patent

CA 2540409

An aluminum alloy sheet which comprises, in mass %, 2 to 5 % of Mg, more than 0.05 % and not more than 1.5 % of Fe, 0.05 to 1.5 % of Mn, a specific amount of a grain fining agent and the balanced amount of Al and inevitable impurities, wherein the content of Si, which is an inevitable impurity, is less than 0.20 %, Fe + Mn > 0.3 %, the amount of Fe forming a solid solution is 50 ppm or more, it contains 5000 pieces/mm2 of intermetallic compounds having a diameter of their corresponding circle of 1 to 6 µm, and it exhibits an average diameter of grains formed in recrystallization of 20 µm or less. The alloy sheet is an Al-Mg based alloy sheet which exhibits a high strength before a baking treatment and high resistance to softening by baking.

Une feuille en alliage d'aluminium contient, en masse %, 2- 5 % Mg, > 0,5 % et <= 1,5 % Fe, 0,05-1,5 % Mn, une quantité spécifique d'un agent d'affinage du grain, la quantité équilibrée de Al et les impuretés inévitables, la quantité de Si, lequel constitue une impureté inévitable, étant inférieure à 0,02 %, Fe + Mn >0,3 %, la quantité de Fe formant une solution solide qui représente 50 ppm minimum; et contient 5000 pièces/mm?2¿ de composés intermétalliques dont le diamètre du cercle correspondant se situe entre 1 et 6µm, et présente un diamètre moyen de grains formés par recristallisation de 20 µm maximum. La feuille en alliage est une feuille en alliage Al-Mg qui présente une résistance élevée avant un traitement de cuisson et une résistance élevée à l'adoucissement par cuisson.

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