Atomic size effect in interdiffusion of aluminum alloys

Abstract

Interdiffusion has been investigated in a-solid solutions of Al-Cr, Al-Hf and Al-Mn systems. The interdiffusion coefficients were presented by, D(Cr)=2.9×10-1 exp (-257 kJ/RT), D(Hf)=1.2×10-2 exp (-242 kJ/RT), D(Mn)=3.7×10-3 exp (-203 kJ/RT).Activation energy in metals was discussed in terms of the size effect. Activation energies of diffusion in aluminum increase with the parameter of (Nr3i/ki). © 1987, The Japan Institute of Light Metals. All rights reserved.