Ni3AlTi

Ni3AlTi is referred to in the context of the nickel–aluminum–titanium (Ni–Al–Ti) system as a ternary intermetallic compound with the nominal composition Ni3AlTi. In practice, compositions near Ni3Al with partial substitution of Al by Ti, or a distinct Ni3AlTi phase, may be reported depending on processing, alloying strategy, and the specific phase diagram region considered. The compound is of interest because alloying Ni3Al with titanium can influence high-temperature behavior and phase stability.

Structure and phase relations in Ni–Al–Ti systems are typically discussed in terms of ordered nickel aluminide derivatives. Ni3Al adopts an ordered L1_2 structure, and Ti incorporation is often described as substituting on the Al sublattice or forming a related solid solution. The exact crystal structure and whether a discrete Ni3AlTi phase forms can depend on composition, heat treatment, and cooling history. The Ni–Al–Ti phase diagram is complex, and reported phases may range from solid solutions to intermetallic compounds, with potential metastable regions under non-equilibrium processing.

Processing methods commonly used to study Ni3AlTi include arc melting or induction melting of elemental Ni, Al, and Ti, followed by homogenization and annealing to promote ordering. Consolidation can be achieved by hot isostatic pressing or other powder metallurgy routes. Thermal treatments are typically aimed at achieving a well-ordered structure and optimized phase constitution.

Properties attributed to nickel aluminides with titanium additions generally include high-temperature strength and improved creep resistance relative to binary Ni3Al, along with potential enhancements in oxidation resistance. However, room-temperature ductility can remain limited, and property trade-offs depend strongly on exact composition and microstructure. Further experimental and computational work continues to clarify the existence and performance of Ni3AlTi as a distinct phase.