The stacking-fault energies of fcc alloys with 28%Ni to pure Ni were investigated using X-ray diffraction line profile analysis. A minimum stacking-fault energy of about 70mJ/m2 occurred at the approximate composition of Fe-40%Ni. The lower-Ni alloys increased rapidly to a stacking-fault energy of about 200mJ/m2. The energies of high-Ni alloys increased linearly to the Ni value of 214mJ/m2. Anomalous reductions in the lattice parameter following cold work were found for low-Ni alloys, and were interpreted as being evidence for Fe3Ni ordering; necessitating corrections to the stacking-fault energy.

Stacking Fault Energies of FCC Fe-Ni Alloys by X-Ray Diffraction Line Profile Analysis. R.E.Schramm, R.P.Reed: Metallurgical Transactions A, 1976, 7[3], 359-63