![Segregation effects on planar defects in crept Co-Al-W and Co-Ni-Al-W based superalloys Segregation effects on planar defects in crept Co-Al-W and Co-Ni-Al-W based superalloys](/3864847/header_image-1543232210.jpg?t=eyJ3aWR0aCI6ODQ4LCJmaWxlX2V4dGVuc2lvbiI6ImpwZyIsIm9ial9pZCI6Mzg2NDg0N30%3D--13a19f22e8c997a49fb7f5deaa3c6af201aa873d)
Segregation effects on planar defects in crept Co-Al-W and Co-Ni-Al-W based superalloys
Creep deformation of γ/γ' microstructure superalloys involves shearing of γ' ordered phase that results in a high density of planar defects. These includes superlattice intrinsic faults (SISF), anti-phase boundaries (APBs) and micro-twins. Recently, in Co and Ni-based superalloys, the formation of these planar defects is shown to be associated with the local reordering and solute diffusion in their vicinity. These have been proposed to act as a rate limiting step for the creep deformation.
This project deals with the identifying the local atomic diffusional mechanisms occurring during creep of new Co and Co/Ni based superalloys by correlative techniques. These include controlled electron channeling contrast imaging (cECCI), high resolution and analytical transmission electron microscopy (TEM) and 3D atom probe tomography (APT) by utilizing a unique setup available at MPIE to get both compositional and crystallographic information of the planar faults.
![© Acta Materialia, (156) 2018](/3864744/original-1543232064.jpg?t=eyJ3aWR0aCI6MjQ2LCJvYmpfaWQiOjM4NjQ3NDR9--92814587c92a21c9338c09c57e77f05fbedaec44)