| Abstract Scope |
Solute segregation to stacking faults, known as Suzuki segregation, can give rise to unique mechanical behavior including the local phase transformation (LPT) effect in γ’-strengthened Ni-based superalloys, microtwinning, enhanced toughening, and serration in stress-strain curves during plastic deformation. Despite these well known effects, many aspects of the fundamental driving force for this phenomenon remain unanswered. To address some of these gaps, we will outline our recent efforts to (1) understand the fundamental driving forces for segregation based on band structure calculations, (2) predict the equilibrium concentration at stacking faults in both disordered and ordered face-centered cubic (FCC) structures, and (3) quantify experimentally Suzuki segregation. This presentation will include examples of disordered FCC Co- and Ni-based binary alloys, γ’-strengthened NiCo-based alloys, and the γ’’’-strengthened Haynes® 244® alloy, and a unifying understanding of Suzuki segregation across these systems will be presented. |