Abstract: A nickel superalloy has the following composition, the concentrations of the different elements being expressed as wt-%: Formula (I), the remainder consisting of nickel and impurities resulting from the production of the superalloy. In addition, the composition satisfies the following equation, wherein the concentrations of the different elements are expressed as atomic percent: Formula (II).

Abstract: A nickel superalloy has the following composition, the concentrations of the different elements being expressed as wt-%: Formula (I), the remainder consisting of nickel and impurities resulting from the production of the superalloy. In addition, the composition satisfies the following equation, wherein the concentrations of the different elements are expressed as atomic percent: Formula (II).

Abstract: A nickel superalloy has the following composition, the concentrations of the different elements being expressed as wt-%: Formula (I), the remainder consisting of nickel and impurities resulting from the production of the superalloy. In addition, the composition satisfies the following equation, wherein the concentrations of the different elements are expressed as atomic percent: Formula (II).

Abstract: A nickel superalloy has the following composition, the concentrations of the different elements being expressed as wt-%: Formula (I), the remainder consisting of nickel and impurities resulting from the production of the superalloy. In addition, the composition satisfies the following equation, wherein the concentrations of the different elements are expressed as atomic percent: Formula (II).

Abstract: A precipitation hardened nickel-base alloy, characterized in that its composition is, in weight percentages: 18%?Cr?22%, preferably 18%?Cr?20%; 18%?Co?22%, preferably 19%?Co?21%; 4%?Mo+W?8%, preferably 5.5%?Mo+W?7.5%; trace amounts?Zr?0.06%; trace amounts?B?0.03%. preferably trace amounts?B?0.01%; trace amounts?C?0.1%, preferably trace amounts?C?0.06%; trace amounts?Fe?1%; trace amounts?Nb?0.01%; trace amounts?Ta?0.01%; trace amounts?S?0.008%; trace amounts?P?0.015%; trace amounts?Mn?0.3%; trace amounts?Si?0.15%; trace amounts?O?0.0025%; trace amounts?N?0.0030%; the remainder being nickel and impurities resulting from the elaboration, the Al and Ti contents further satisfying the conditions: Ti/Al?3;??(1) Al+1.2 Ti?2%;??(2) (0.2 Al?1.25)2?0.5 Ti?0%;??(3) Ti+1.5 Al?4.5%.??(4) Part made in this alloy and its manufacturing method.

Abstract: A nickel superalloy has the following composition, the concentrations of the different elements being expressed as wt-%: Formula (I), the remainder consisting of nickel and impurities resulting from the production of the superalloy. In addition, the composition satisfies the following equation, wherein the concentrations of the different elements are expressed as atomic percent: Formula (II).

Abstract: A method for manufacturing a blank part in Ni-base superalloy, wherein an alloy is prepared and heat treatments are conducted characterized in that: the said superalloy contains at least a total of 2.5% of Nb and Ta; heat treatment is conducted comprising a plurality of steps: a first step at between 850 and 1000° C. held for at least 20 minutes to precipitate the ? phase at the grain boundaries; a second step held at a temperature higher than the temperature of the first step allowing partial dissolution of the ? phase obtained at the first step; ageing treatment comprising a third step and optionally one or more additional steps at a temperature below the temperature of the first step and allowing precipitation of the hardening phases ?? and ??. Part thus obtained.