The Embedded Atom Method (EAM) has been used to calculate the formation energies of small voids (containing helium) in nickel. The binding energies of helium and vacancies to the helium-void complexes are also determined. Helium is strongly bound to helium-void complexes (up to 4 eV binding energy), and high helium densities significantly increase vacancy binding energies. Thus, the effect of helium is to stabilize small voids. The formation energy of small helium-void complexes can be separated into two parts, the energy to create the empty void and a residual energy associated with the helium atoms. The latter is shown to primarily arise from the long-range interactions of the helium atoms with the surrounding metal atoms rather than from short-range helium-helium interactions.
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Materials Science(all)
- Nuclear Energy and Engineering