A new third generation single crystal superalloy has been developed for aircraft engine turbine airfoil applications.This alloy, Rene N6, is microstructurally stable and is approximately 30°C stronger than the second generation single crystal, RenC N.5. A new type of instability phenomena, SRZ, was encountered in the alloy development process.SRZ is a cellular precipitation reaction that primarily occurs beneath coatings, but can also be found along grain boundaries. RenC N6 was developed to avoid the detrimental SRZ, while maintaining excellent creep strength.The mechanical properties and environmental resistance of Rene N6 are covered and compared to similar superalloys.RenC N6 has undergone extensive engine testing and currently is being utilized for production engines.

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Rene'142 is a high strength, nickel base Directionally Solidified (DS) Turbine alloy, which is now operational in commercial and military jet engines. Rene'l42 is directionally solidified with columnar grain boundaries; this process is less expensive than the directionally solidified single crystal (no grain boundaries) process, due to easier mold making, faster casting, less expensive inspection and higher yields. Rene'142 has rupture strength equivalent to single crystal Rene'N4, PWA 1480, and CMSX-3.