  We present a comprehensive study of voids formation, nucleation and growth in
a prototype model of binary alloys subjected to irradiation by using a combined
approach based on phase field and rate theories. It is shown that voids
formation is caused by interaction of irradiation-produced vacancies through
elastic deformation of a lattice and vacancy coupling with composition field of
the alloy. Phase diagrams illustrating the formation of states related to solid
solution, phase decomposition, and patterning are obtained. Formation of voids
from supersaturated ensemble of vacancies is accompanied by composition
rearrangement of alloy components. It was found that elastic inhomogeneity
leading to the formation of anisotropic precipitates in an initially prepared
binary alloy results in the formation of a void super-lattice under
irradiation. It was shown that voids nucleate and grow with dose according to
diffusion controlled precipitation processes, where universal dynamics of voids
growth is revealed. Estimations of main quantitative and statistical
characteristics of voids by using material parameters relevant to most of
alloys and steels give good agreement with experimental observations.
