Directionally solidified eutectic .gamma.+.beta. 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.+.beta. nickel-base superalloy casting having improved high temperature strength and oxidation resistance properties is provided comprising a two phase eutectic structure containing, on a weight percent basis, 5.0-15.0 tungsten, 8.5-14.5 aluminum, 0.0-35.0 cobalt and the balance being nickel. Embedded within the .gamma. phase nickel-base matrix are aligned eutectic .beta. phase (primarily (Ni,Co)Al reinforcing lamellae.
Claims12
An article of manufacture having improved high temperature strength and oxidation resistance properties comprising a directionally solidified multivariant eutectic .gamma.+.beta. nickel-base superalloy casting containing a two phase eutectic structure consisting of a .gamma. phase matrix of a face-centered-cubic solid solution crystal structure based on nickel having embedded in the .gamma. phase an aligned reinforcing lamellar .beta. phase consisting primarily of a nickel-aluminum (Ni,A1) composition which is a body-centered-cubic (CsC1) ordered intermetallic based on NiA1.
Dependencies are inferred from the claim text.