Directionally solidified eutectic .gamma.-.gamma.' nickel-base superalloys
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorMelvin R. Jackson
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Abstract
A directionally solidified multivariant eutectic .gamma.-.gamma.' nickel-base superalloy casting having improved high temperature properties is provided comprising a two-phase eutectic structure consisting essentially of, on a weight percent bases, 6.0 to 9.0 aluminum, 5.0 to 17.0 tantalum, 0-10 cobalt, 0-6 vanadium, 0-6 rhenium, 2.0-6.0 tungsten, and the balance being nickel, subject to the proviso that the sum of the atomic percentages of aluminum plus tantalum is within the range of from 19-22, and the ratio of atomic percentages of tantalum to aluminum plus tantalum is within the range of from 0.12 to 0.23. Embedded within the .gamma. nickel-base matrix are aligned eutectic .gamma.' phase (primarily nickel-aluminum-tantalum) reinforcing fibers.
Claims13
An article of manufacture having improved high temperature properties comprising a unidirectionally solidified anisotropic metallic mutrivariant eutectic casting containing a matrix of a .gamma.-face-centered-cubic crystal structure nickel-base superalloy having embedded in the .gamma. phase an aligned reinforcing fibrous .gamma.' phase consisting primarily of a nickel-aluminum-tantalum composition which is a complex cubic L1.sub.2 crystal structure based on Ni.sub.3 Al.
Dependencies are inferred from the claim text.