Foils of the pure metals were irradiated with 1.25MeV electrons, at temperatures of between 110 and 323K, in a high-voltage electron microscope. Void formation after stacking-fault tetrahedra-formation was found in specimens that were irradiated above 300K. The void nucleation was explained in terms of the effect of a small amount of solute or gas atoms which segregated to stacking fault tetrahedron clusters under irradiation.

Void Formation close to Stacking Fault Tetrahedra in Heavily Electron Irradiated Pure Ag and Cu. K.Niwase, F.Phillipp, W.Sigle, A.Seeger: Journal of Nuclear Materials, 1999, 271-272, 261-5