What Is Austenite?
Austenite is the high-temperature parent phase of a shape memory alloy (SMA) and is characterized by a more symmetric and stable crystal structure compared to martensite. When an SMA is heated above its transformation temperature, it transitions from martensite to austenite through a reversible, diffusionless phase transformation.
Role of Austenite in SMA Actuation
This transformation to austenite is the driving force behind shape recovery and actuation in SMAs. As the material returns to the austenite phase, it recovers its original shape and generates mechanical force. Control of the austenite phase and its transformation temperatures is critical for designing reliable SMA actuators, sensors, and smart material systems.