Al-Zn-Mg-Cu alloys and products with improved ratio of...

Alloys or metallic compositions – Aluminum base – Copper containing

Reexamination Certificate

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C148S417000

Reexamination Certificate

active

07550110

ABSTRACT:
The invention relates to alloys and associated products which are laminated, extruded or forged in Al—Zn—Mg—Cu alloy. Alloys of the invention generally comprise (in mass percentage):a) Zn 8.3-14.0=Cu 0.3-4.0=Mg 0.5-4.5 Zr 0.03-0.15 Fe+Si<0.25b) at least one element selected from the group consisting of Sc, Hf, La, Ti, Ce, Nd, Eu, Gd, Tb, Dy, Ho, Er, Y and Yb, the content of each elements; if included, being between 0.02 and 0.7%, andc) the aluminum remainder and inevitable impurities, and whereinMg/Cu<2.4 and(7.7−0.4 Zn)>(Cu+Mg)>(6.4−0.4 Zn). Products of the present invention are useful as structural elements (for example wing unit caisson, wing unit extrados) in aeronautical construction.

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“Aluminum and Aluminum Alloys”, ASM International, 1993, pp. 41, 45.

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