alloy products, aluminum-copper-lithium was low density

The invention relates to a product made of aluminum based alloy comprising, in% by weight, Cu: 2.4-3.2; Li: 1.6-2.3; Mg: 0.3-0.9; Mn: 0.2 to 0.6; Zr: 0.12 to 0.18; and as Zr≥ - 0.06 * 0.242 + Li ,. Zn <1.0; Ag: <0.15; Fe + Si ≤ 0.20; optionally at least one of Ti, Sc, Cr, Hf and V, the content of the element is chosen, being: Ti 0,01 - 0.15; Sc: 0.01 to 0.15, Cr: 0.01 to 0.3, Hf: 0.01 to 0, 5; V: 0.01 to 0.3 ,; other elements each 0.05 ≤ and ≤ 0.15 total, remainder aluminum. The invention also relates to a method of manufacturing a cast product of an aluminum alloy according to the invention comprising the steps of: preparing a liquid metal bath; casting a raw form from said liquid metal bath; and solidifying the raw forme into a billet, a rolling plate or a forging blank; characterized in that the casting is carried out without addition of refining the grain refining or by adding a composition comprising (i) Ti and (ii) B and C, and as the content B from the refining agent is less than 45 ppm , and that of C of less than 6 ppm, and / or characterized in that the casting is carried out for gross E-shaped casting thickness or diameter D exceeds 150 mm at a casting speed v (mm / min) greater than 30 for a raw form of casting or plate type 9000 / D for unwrought casting type billet.