Deformation mechanism characteristics in a Ni-based alloy X-750: Dislocation/precipitate interaction

Transmission electron microcopy (TEM) analysis was employed to characterize the deformation mechanisms in X-750 Ni-based superalloy. Both in-situ and ex-situ tensile tests were carried out at room temperature to observe the dislocation structure and trace the interaction between the gamma'-precipitates and dislocations. The deformation mechanism was found to be planar slip which resulted in the formation of planar slip bands. This was attributed to the low stacking fault energy of X-750 alloy as well as the shearing of a high density of ordered gamma'-precipitates. The shearing of gamma'-precipitates occurred through an Anti-phase boundary (APB) mechanism evidenced by paired superlattice dislocations or a Stacking Fault (SF) mechanism by partial dislocations evidenced by isolated stacking faults within the gamma'-precipitates.

Automated summary

TEM analysis was employed to study deformation mechanisms in X-750 Ni-based superalloy, showing that planar slip resulted in the formation of planar slip bands due to low stacking fault energy and shearing of ordered gamma'-precipitates. The shearing of gamma'-precipitates occurred through APB or SF mechanisms evidenced by superlattice or stacking faults.