Abstract: A single crystal nickel-base superalloy is disclosed having an improved incipient melting temperature and oxidation resistance. The single crystal nickel-base alloy of this invention is characterized by specific addition of chromium, tungsten, aluminum and tantalum to produce an alloy having moderate high temperature strength and improved oxidation resistance and incipient melting temperature. The nominal composition of our new single crystal alloy (in weight percent) is 10-15% Cr, 0-4% Co, 6-8.5% W, 6-7% Al, 0-1% Ti, 2-6% Ta, and the balance nickel.

Abstract: A single crystal nickel-base super alloy is disclosed having good high temperature strength with improved metallurgical stability and environmental resistance. The single crystal alloy of this invention is characterized by the addition of rhenium for high temperature strength, the inclusion of cobalt to increase metallurgical stability by inhibiting the formation of sigma phase, and the ellimination of vanadium to enhance hot corrosion resistance. The nominal composition of my new single crystal alloy is 8-10% Co, 5% Cr, 2% Mo, 5% W, 3% Re, 5.5% Al, 1.5% Ti, 6.3% Ta, and the balance Nickel.

Abstract: A specific composition range and process sequence are described for the production of single crystal superalloy articles which have an exceptional combination of high temperature mechanical properties and resistance to oxidation and hot corrosion. The nominal composition is 5.2% Cr, 5.4% Al, 1.1% Ti, 2.0% Mo, 4.9% W, 6.4% Ta, 3% Re, 0.4% V, balance nickel. Material of this composition is cast and solidified in single crystal form and heat treated to produce an optimum microstructure.