The stacking-fault energy of a set of experimental Ni–Cr–Fe alloys was determined using line profile analysis of synchrotron X-ray diffraction measurements (table 5). The methodology was supported by Warren–Averbach calculations and the relationship between the stacking-fault probability and the mean-square microstrain. These parameters were obtained experimentally from cold-worked and annealed specimens. The results showed that the stacking-fault energy in these alloys was strongly influenced by the type and quantity of added elements. The simultaneous addition of Nb, Hf and Mo to the Ni–Cr–Fe alloys generated stronger decreases in stacking-fault energy.

Stacking Fault Energy Measurements in Solid Solution Strengthened Ni–Cr–Fe Alloys using Synchrotron Radiation. J.Unfried-Silgadoa, L.Wua, F.F.Ferreirad, C.M.Garzóne, A.J.Ramírez: Materials Science and Engineering A, 2012, 558, 70-5