Dynamic strain aging in a new Ni–Co base superalloy

Dynamic strain aging (DSA) in a newly developed Ni–Co superalloy, TMW-2, was examined at temperatures ranging from room temperature to 600 °C and strain rates between 3 × 10−2 and 8 × 10−5 s−1. The alloy exhibited both normal and inverse DSA effects at the temperatures and strain rates tested. Transmission electron microscopy evidence suggests that the normal behavior is associated with conventional DSA due to dynamic dislocation–solute interaction, while the inverse behavior may be related to the occurrence of stacking faults.