J. Phys. IV France 11 (2001) Pr10-127-Pr10-131
Diffusivité du joint de grain durant la précipitation discontinue de solutions solides sursaturées Mg-Al et Mg-Al-CdD. Bradai, B. Alili and M. Kadi-Hanifi
Faculté des Sciences (Physiques), USTHB, BP. 32, El-Alia, Dar-El-Beida, Alger, Algeria
The grain boundary chemical diffusivity triple product SδDb parameter ( s being the Gibbs segregation factor, δ the thickness and Db the chemical diffusivity of the grain boundary) of Al in a binary MgAl and a ternary MgAlCd solid solutions during the discontinuous precipitation reaction have been determined using several analytical models. A comparison of the values obtained with the experimental data and the deduction of the activation energy confirm the reaction to be controlled by diffusion of Al atoms at the migrating grain boundary.
© EDP Sciences 2001