Simulation of interaction of cascades atomic displacements of the helium bubbles small by matrix BCC Fe

A molecular dynamics simulation of atomic displacement cascades near helium bubbles of small size (up to 1 nm in diameter) in the matrix of the bcc iron was performed. Simulation is carried out for the PKA energies from 1 to 30 keV. The model is based on the N-body interactions for iron and simple pairwise He-He and He-Fe interactions. Qualitative and quantitative changes in the size and composition (the ratio of He / V) of helium bubbles were evaluated. It was show that such bubbles trend to partial dissolution under atomic displacement cascade.