On Synergistic Effects of Hierarchical Γ′ Precipitates and Discontinuous Plastic Flow in a Ni-based Single Crystal Superalloy with an [001] Orientation

A discontinuous plastic flow is detected in a single-crystal superalloy with an [001] orientation during tensile tests over a wide temperature range. Results reveals that the synergistic impact of normal γ′ precipitates and nanoscale γ′ precipitates in γ matrix on the dislocations motion is the root of the serrated flow.