Intrinsic stacking fault energies, formation energies and structural energies differences were deduced from self-consistent electronic structure calculations by using the layer Korringa-Kohn-Rostoker method within the coherent potential approximation. It was found that the intrinsic stacking fault energy was equal to almost twice the energy difference between the hexagonal close-packed and face-centered cubic structures. This indicated that the inter-atomic interactions that were relevant to the structural properties were short-ranged. A modified rigid band model was used to analyze a non-linear variation in the stacking-fault energy of Al-Cu and Al-Ag as a function of composition. In the case of Al-Zn, it was shown that the conclusions which were drawn from the rigid-band model held for any system in which Al was alloyed with an element that had a filled d-band.

Systematic Study of Stacking-Fault Energies of Random Al-Based Alloys T.C.Schulthess, P.E.A.Turchi, A.Gonis, T.G.Nieh: Acta Materialia, 1998, 46[6], 2215-21