Swelling rates are calculated for two types of material with heterogeneous distributions of dislocations and voids, namely copper irradiated with neutrons to low dose at 250 degree C and heavily cold-worked copper irradiated with 1 MeV electrons in a HVEM at 250 degree C. Both materials are considered to consist of non-interacting spherical components with a wall and an inner cell with different dislocation and/or void densities. We subdivide the sphere (wall plus cell) in a number of concentric shells and find a quasi-static solution for the interstitial and vacancy concentrations in the different shells by a finite-difference method. From these concentrations the local and the average swelling rate and the dependence of this effect of the heterogeneities in sink distribution on swelling rate and the dependence of this effect on various structural parameters are investigated.
|Journal||Philosophical magazine. A. Physics of condensed matter. Defects and mechanical properties|
|Publication status||Published - 1986|