Figure 4: Correlation between an APT analysis and DF-TEM image.
From: Mapping the evolution of hierarchical microstructures in a Ni-based superalloy
The image shows a sample after homogenizing Ni86.1Al8.5Ti5.4 at 1,548 h/4 h, ageing at 1,213 K/0.75 h and subsequently at 1,023 K/6 h. (a) The APT volume where γ spheres (purple) can be seen inside the γ′ precipitates, represented by 80 at.% Ni or 10 at.% Ti iso-concentration surfaces, respectively, corresponds to the yellow box in the DF-TEM image. (b) A further magnified region is shown, which corresponds to the yellow box in the APT volume of a. (c,d) Detailed analysis of the individual γ sphere marked by a yellow box in b. (d) Different projections and a concentration profile for Ni and Ti (at.%) are shown. The errors are s.d., 2σ. Scale bar, 100 nm (a); 10 nm (b); and 2 nm (c) (widths).
