| 摘要 |
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.
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