Atomic size effect in interdiffusion of aluminum alloys

Abstract

Interdiffusion has been investigated in α-solid solutions of Al-Cr, Al-Hf and Al-Mn systems. The interdiffusion coefficients were presented by,
D(Cr)=2.9×10^-1exp(-257kJ/RT),
D(Hf)=1.2×10^-2exp(-242kJ/RT),
D(Mn)=3.7×10^-3exp(-203kJ/RT).
Activation energy in metals was discussed in terms of the size effect. Activation energies of diffusion in aluminum increase with the parameter of (Nr³_i/k_i).