Effect of Aluminum Concentration on the Lattice Parameters and Mean-Square Displacements of Atoms in Cu–Al and Ti–6Al–4V Alloys

Abstract

It is shown that the fcc lattice parameter and the total mean-square displacements of atoms increase when copper is doped with aluminum. Parameters а and с of the hcp α-Ti lattice decrease when titanium is doped with aluminum and vanadium. This effect is attributed to the size factor of radii of alloy elements. The lattice parameter of Ti–6Al–4V alloy samples subjected to electron-beam processing may vary either way compared to α-Ti prior to processing. It is demonstrated that the observed variation of the lattice parameter is induced by the redistribution of aluminum and silicon in surface layers. The mean-square displacement of atoms and the lattice parameters in α-Ti and the Ti–6Al–4V alloy are directly proportional.