nimonic

Nimonic is a trademark used for a family of nickel-based superalloys designed for high-temperature structural applications. These alloys are strengthened by precipitation of the gamma-prime phase and are engineered to retain high strength and creep resistance at elevated temperatures typical of jet engines and gas turbines.

Composition typically includes nickel as the base, with chromium for oxidation resistance, and aluminum and titanium to form gamma-prime. Other alloying elements such as cobalt, niobium, tantalum, tungsten or molybdenum may be added to improve strength and stability. The exact composition varies among members of the Nimonic family.

Notable alloys in the Nimonic series include Nimonic 75, Nimonic 80A, Nimonic 90 and Nimonic 105, among others. These alloys have been used for turbine discs, blades and other components where high-temperature strength is essential.

Properties of Nimonic alloys include high creep resistance, good high-temperature strength, and oxidation resistance, but they can be difficult to fabricate and are relatively expensive. They are typically produced in wrought and cast forms and require careful heat treatment to optimize gamma-prime precipitation.

Applications are primarily in aerospace gas turbines, civil and military aircraft engines, and some land-based turbines, where components such as blades, vanes, and discs operate at high temperatures for extended periods.