The temperature dependence of the antiphase boundary energy in Ni3Fe II. The evolution kinetics

Publisher Website
Google Scholar
Abstract
In Ni3Fe with long-range order, the width of superdislocations formed by plastic deformation has been observed by transmission electron microscopy (TEM) during isothermal annealing. The separation between the superpartials enclosing the antiphase boundary (APB) increases because the geometrical APB formed by glide can lower its free energy by reordering of atoms in its neighbourhood. The values for the equilibrium APB energy γ reached asymptotically as a function of temperature have been reported previously. A detailed study of the kinetics shows that during the transition there is no quasi-static equilibrium where the separation of the unit dislocation is determined by a slowly changing instantaneous value γ(t) of the APB. The equilibrium configuration of the APB seems to be established very fast and the rate of separation is rather described by an Einstein drift in which the separating unit dislocations produce the equilibrium APB in their wake.

This publication has 4 references indexed in Scilit: