Nickel aluminide

[1][2] Meanwhile, NiAl displays excellent properties such as lower density and higher melting temperature than those of Ni3Al, and good thermal conductivity and oxidation resistance.

[2] These properties make it attractive for special high-temperature applications like coatings on blades in gas turbines and jet engines.

[7] This coarsening problem is addressed by introducing other elements such as Fe, Cr and Mo, which generate multiphase configurations that can significantly increase the creep resistance.

[8] This creep resistance is attributed to the formation of inhomogeneous precipitate Cr4.6MoNi2.1, which pins dislocations and prevents further coarsening of the γ' phase.

[12] This is due to the formation of unique microstructures such as the eutectic alloy Ni45.5Al9Mo and α-Cr inclusions that contribute to solid solution hardening.

An alloy of Ni3Al, known as IC-221M, is made up of nickel aluminide combined with several other metals including chromium, molybdenum, zirconium and boron.

[14] It has been found that the microstructure of this alloy includes Ni5Zr eutectic phase and therefore solution treatment is effective for hot working without cracking.