Directionally solidified nickel-base eutectic alloys

An article of manufacture having improved high temperature properties, improved fiber volume fraction and improved fiber density comprising a unidirectionally solidified anisotropic metallic casting solidified at a rate greater than 1/4 inch per hour comprising

• a. a matrix of anickel-base superalloy consisting essentially of, on a weight basis, 6-15% tungsten, 2-7% rhenium, 0-5% cobalt, 0-5% molybdenum, 2-7% vanadium, 0-4% aluminum, 0-7% chromium, 10-23% tantalum, 0.1-1.5% carbon and the balance being essentially nickel;
• and
• b. an aligned eutectic carbide reinforcing fibrous phase embedded in the matrix.

An alloy capable of being unidirectionally solidified to provide a composite casting having improved high temperature properties, improved fiber volume fraction, improved fiber density, and capable of forming an aligned eutectic carbide reinforcing fibrous phase embedded in the alloy matrix during unidirectional solidification of the alloy, said alloy comprising a nickel base superalloy consisting essentially of, on a weight basis, 6-15% tungsten, 2-7% rhenium, 0-5% cobalt, 0-5% molybdenum, 2-7% vanadium, 0-4% aluminum, 0-7% chromium, 10-23% tantalum, 0.1-1.5% carbon, and the balance being essentially nickel.

An alloy capable of being unidirectionally solidified at a rate greater than 1/4 inch per hour to provide a composite casting having improved high temperature properties, improved fiber volume fraction, improved fiber density, and capable of forming an aligned eutectic carbide reinforcing fibrous phase embedded in the alloy matrix during unidirectional solidification of the alloy, said alloy comprising a nickel base superalloy consisting essentially of, on a weight basis, 6-15% tungsten, 2-7% rhenium, 0-5% cobalt, 0-5% molybdenum, 2-7% vanadium, 0-4% aluminum, 0-7% chromium, 10-23% tantalum, 0.1-1.5% carbon, and the balance being essentially nickel.