Directionally solidified eutectic .gamma.-.gamma.' nickel-base s

Details Directionally solidified eutectic .gamma.-.gamma.' nickel-base s Directionally solidified eutectic .gamma.-.gamma.' nickel-base s

1976-05-07

1977-10-25

Dean, R.

Metal treatment

Compositions

Heat treating

75170, 148 325, C22C 1903

Patent

active

040554473

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.

REFERENCES:
patent: 3793010 (1974-02-01), Lemkey et al.

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