Nickel base alloy

Claim 1

A gamma prime strengthened nickel base alloy consisting essentially of, by weight, from 12.0 to 20.0% chromium, from 4.0 to 7.0% titanium, from 1.2 to 3.5% aluminum, from 12.0 to 20.0% cobalt, from 2.0 to 4.0% molybdenum, from 0.5 to 2.5% tungsten, from 0.031 to 0.048% boron, from 0.005 to 0.045% carbon, up to 0.75% manganese, up to 0.5% silicon, up to 1.5% hafnium, up to 0.1% zirconium, up to 1.0% iron, up to 0.2% of rare earth elements that will not lower the incipient melting temperature below the solvus temperature of the gamma prime present in the alloy, up to 0.1% of elements from the group consisting of magnesium, calcium, strontium and barium, up to 6.0% of elements from the group consisting of rhenium and ruthenium, balance essentially nickel; said titanium plus said aluminum content being from 6.0 to 9.0%; said titanium and aluminum being present in a titanium to aluminum ratio of from 1.75:1 to 3.5:1; said alloy being substantially free of deleterious acicular, sigma and mu phases; said gamma prime being characterized as gamma prime which is substantially speroidal; said alloy being characterized by a highly desirable combination of hot corrosion resistance, strength, creep resistance, phase stability and stress rupture life; said desirable combination of properties being, in part, attributable to said boron content of from 0.031 to 0.048%.