The formation of precipitate free zones along grain boundaries in a superalloy and the ensuing effects on its plastic deformation

Nucleation and thermal stability of carbide precipitates in high Nb containing TiAl alloys

“…In general, they were reported to be detrimental to the mechanical properties of the alloys due to possible dislocation pile-ups (easier deformation and fracture) in soft PFZs [33,34]. Nevertheless, Park et al [35] reported PFZs to be beneficial for low-cycle fatigue life of an AleZneMg alloy because of local stress relief in PFZs.…”

Mechanism of heat affected zone cracking in Ni-based superalloy DZ125L fabricated by laser 3D printing technique

“…Due to the high intrinsic hardness and brittle nature, micro-cracking initiates frequently in a high-stress environment, in the form of decohesion of carbides/matrix interface or breaking of the brittle MC carbides [44]. Besides, the diffusion of Ti from the γ′ precipitates to the MC particles during heat treatment usually results in the γ′ precipitate free zones (PFZs) near the carbides, where dislocation generation is promoted, and thus the resultant dislocation pile-ups give rise to the reduction of strength of superalloy [45]. Consequently, MC particles may serve as weak points for the resistance to hot cracking and they are frequently found near the crack root (Fig.…”

Microstructural evolution in austenitic heat-resistant cast steel 35Cr25Ni12NNbRE during long-term service

“…Some researchers reported that PFZs could form along grain boundaries in many precipitation strengthened alloys including aluminum alloys [19][20][21][22][23], superalloy [24,25] and austenitic steels [26,27]. The PFZ formed by the vacancy depletion and the solute depletion mechanisms [19][20][21][22][23][24][25].…”

“…The PFZ formed by the vacancy depletion and the solute depletion mechanisms [19][20][21][22][23][24][25]. PFZ brought to detrimental effect on the stress corrosion and mechanical properties [22].…”