Niobium-silicide intermetallics base ultra-high temperature alloys,have shown great potential for serving
at the hot section on the next generation aero-engines and scramjet engines. Due to their high melting temperatures,
low densities and excellent high-temperature strengths, In the present paper, we discuss the effects of directional
solidification and heat treatment microstructures and properties of the alloying,powder metallurgy. The future development
trends are also discussed.