The evolution of aerospace propulsion and thermal management systems necessitates the development of actuators capable of operating in extreme environments exceeding 200°C. Conventional shape memory alloys (SMAs), such as near-equiatomic NiTi, are limited by their low transformation temperatures and poor functional stability at high thermal loads. This article explores recent innovations in Material Science, specifically focusing on ternary and quaternary alloying (NiTi-Hf, NiTi-Zr, and NiTi-Pd) to elevate the Martensitic Start (Ms) temperatures. We examine the microstructural engineering required to suppress slip deformation and enhance cyclic stability through nanoprecipitation and thermomechanical processing. The study further integrates these Material Science advancements into the design of a prototype aerospace valve actuator, demonstrating a 40% reduction in weight compared to traditional electromagnetic solenoids. Results indicate that with proper compositional control, high-temperature SMAs (HTSMAs) can provide reliable, high-power-density actuation for next-generation jet engines and hypersonic vehicles.
M.Balaji et al. (Mon,) studied this question.