AL-ZN-MG-CU ALLOY PRODUCTS DISPLAYING AN IMPROVED COMPROMISE BETWEEN STATIC MECHANICAL PROPERTIES AND TOLERANCE TO DAMAGE

摘要

The invention relates to a product rolled, extruded or forged alloy al - - - mg, cu, zn, characterized in that it contains (in percentages by weight): a) zn 8, 3 - 14, 0 or 0, 3 - 4, 0 mg 0, 5 - 4, 5, zr 0, 03 - 0, 15, fe + si 0, 25 b) at least one element selected from the group composed of sc, hf, la, ti, this, nd, eu, gd, tb, dy, ho, er, y, yb, the content of each of said elements, if it is selected, being between 0, 02, and 0, 7%, c) the remainder aluminium and inevitable impurities, and in that it satisfies the conditions of) mg / cu 2, 4 and e) (7, 7 - 0, 4) & zn (cu + mg) (6, 4 - 0, 4, zn). These products can be used as structural elements (for example of the wing spar box, the extrados side of the blade) in aeronautical construction.