Nickel-based superalloy parts and realized in suparalliage

Nickel superalloy having the following composition basis, the contents of the various components being expressed as percentages by weight: - 1.3% ≤ Al ≤ 2.8%; - traces ≤ Co ≤ 11%; - 14% ≤ Cr ≤ 17%; - traces ≤ Fe ≤ 12%; - 2% ≤ Mo ≤ 5%; - 0.5% ≤ Nb + Ta ≤ 2.5%; - 2.5% ≤ Ti ≤ 4.5%; - 1% ≤ W ≤ 4%; - 0.003% ≤ B ≤ 0.030%; - traces ≤ C ≤ 0.1%; - 0.01% ≤ Zr ≤ 0.06%; the balance being nickel and impurities resulting from the smelting, and such that the composition satisfies the following equations wherein the contents are expressed in atomic percentages: 8 at% ≤ Al + Ti at% at% at% Nb + + Ta ≤ 11 at% at% 1 ≤ (Ti + Nb at% at% at% + Ta) / at% Al ≤ 1.3 piece made of this superalloy