Measurements were made of the dynamic Young's modulus (stiffness) and damping for NiAl specimens containing varying amounts of aluminium nitride and prepared by cryomilling. Five specimens of NiAl-AlN were measured at room temperature, each specimen having a different percentage of AIN in the range 1%-30%. Further measurements were made on the 1% and 30% AIN specimens for the temperature range 22-495 degrees C. At room temperature, the Young's modulus of the NiAl-AlN specimens decreased linearly with increasing percentage of AIN. The temperature dependence of Young's modulus for the 1% and 30% AIN specimens was found to be linear. These results were compared with those of typical nickel-based superalloys for a similar temperature range. The damping for all of the NiAl-AlN specimens was of the order of that for other intermetallic com pounds (10(-3)-10(-4)). The study opened up the possibility of NiAl-AlN being a less-expensive and more easily produced alternative to nickel-based superalloys for high-temperature, high-stiffness applications.