Modeling Shearing of
نویسندگان
چکیده
The activation energies associated with the formation of a superlattice intrinsic stacking fault (SISF) from an antiphase domain boundary (APB) and the formation of a superlattice extrinsic stacking fault (SESF) from a complex stacking fault (CSF) in g 0 phase of Ni-based superalloys are calculated using a microscopic phase field dislocation model in combination with the nudged elastic band (NEB) method. The model incorporates the generalized stacking fault (GSF) energy and hence allows for dislocation dissociations. The results suggest that formation of SESF from CSF rather than formation of SISF from APB is most likely the operating mechanism for the isolated faulting of g 0 precipitates observed in the experiments.
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