Temperature and strain rate dependence of the flow stress of single crystal NiAl deformed along 〈100〉

Single crystal NiAl and Ni-49.75Al-0.25Fe have been deformed along 〈110〉 at temperatures of 77, 298 and 773K and strain rates of 0.001/s, 0.1/s and 2000/s. The flow stress of 〈110〉 NiAl is rate and temperature sensitive. A significant decrease in the work hardening rate is observed after deformation at 77K and a strain rate of 2000/s. Coarse {110} slip traces are observed after deformation at a strain rate of 2000/s at 77K, while no slip traces were observed after deformation under all other conditions. TEM observations reveal distinct {110} slip bands after deformation at 77K and a strain rate of 2000/s.