Patent ID: 7491275

Claim:
A nickel-base alloy comprising: a matrix comprising γ′-phase precipitates and γ″-phase precipitates, wherein the γ′-phase precipitates are predominant strengthening precipitates in the nickel-base alloy; and an amount of grain boundary precipitates sufficient to pin the majority of the grain boundaries in the matrix, the grain boundary precipitates being selected from the group consisting of δ-phase precipitates, η-phase precipitates, and mixtures thereof, and having short, generally rod-shaped morphologies; and wherein the nickel-base alloy comprises, in percent by weight, up to 0.1% carbon, from 12% to 20% chromium, up to 4% molybdenum, up to 6% tungsten, from 5% to 12% cobalt, up to 14% iron, from 4% to 8% niobium, from 0.6% to 2.6% aluminum, from 0.4 % to 1.4 % titanium, from 0.003 % to 0.03 % phosphorus, from 0.003% to 0.015% boron, and nickel; wherein a sum of the weight percent molybdenum and the weight percent tungsten is at least 2% and not more than 8%; and wherein a sum of atomic percent aluminum and atomic percent titanium is from 2% to 6%, a ratio of atomic percent aluminum to atomic percent titanium is at least 1.5, and the sum of atomic percent aluminum and atomic percent titanium, that sum divided by atomic percent niobium is from 0.8 to 1.3.