Effect of Cu on Nanoscale Precipitation Evolution 353
Figure 4. Three-dimensional atom maps of Fe–NiAl (a,c,e,g) and Fe–NiAl–Cu (b,d,f,h) alloys after aging at 500°C for 0.5 h (a,b), 4 h (c,d), 32 h (e,f), 128 h (g,h); some clusters are marked in circle.