Abstract: Disclosed is a nickel-base alloy comprising, in weight percentages based on total alloy weight: 11 to 18 chromium; 16 to 28 cobalt; 1.5 to 7.0 molybdenum; 0 to 6.5 tungsten; 0 to 1.0 niobium; 1.0 to 2.5 aluminum; 2.0 to 6.0 titanium; 0 to 2.0 tantalum; 0 to 4.0 iron; 0 to 0.5 hafnium; 0.01 to 0.2 carbon; 0.001 to 0.02 boron; 0.001 to 0.1 zirconium; nickel; and impurities. Also disclosed is a nickel-base alloy comprising, in weight percentages based on total alloy weight: 11 to 18 chromium; 24 to 28 cobalt; 1.5 to 7.0 molybdenum; 2.0 to 6.0 tungsten; 0 to 1.0 niobium; 1.0 to 2,5 aluminum; 2,0 to 6.0 titanium; 0 to 2.0 tantalum; 0 to 4.0 iron; 0 to 0.5 hafnium; 0.01 to 0.2 carbon; 0.001 to 0.02 boron; 0.001 to 0.1 zirconium; nickel; and impurities.

Abstract: Provided is a method of fabricating an article, including deforming an ingot of a nickel-based superalloy to form an intermediate article, forming a substantially homogeneous dispersion of Laves phase precipitates within the intermediate article, wherein the Laves phase precipitates are present at a concentration of at least about 0.05% by volume and the precipitates have a mean diameter of less than one micron. Also provided is a nickel-based superalloy including a substantially homogeneous dispersion of Laves phase precipitates, wherein the intergranular and transgranular Laves phase precipitates are present at a concentration of at least about 0.1% by volume and wherein the precipitates have a mean diameter of less than one micron. Precipitation of Laves phase may control microstructure during Thermo-mechanical processing and produce superalloys with refined grain size.