Mechanical characteristics of nickel-titanium intermetallic compounds. (A) For a stabilized martensitic material when the temperature is less than the martensite finish temperature (Mf) but the strain (deformation) is more than ca 0.08;60,106 (B) for an active austenitic material, ie, a stress-induced martensitic material (SIM), when the temperature is less than the deformation temperature of yielding (Md) but greater than the austenite finish (Af) temperature;106,107 and (C) for an active martensitic material when the temperature is less than Mf and the strain is less than ca 0.08.107,108