The formation of nanopores in metal materials after irradiation by beams of Ar⁺ with energy of 30 keV

In this paper are the results of direction observations of nanopores in the subsurface volume of metals materials Pt and Pd(CuAg) using field-ion microscopy (FIM). Radiation of tip specimens was carried out with ions having an energy ∼ 25-30 keV in the fluency range of 10¹⁶ − 10¹⁸ ions/cm², the current density lying within 150– 340 µA/cm². Nanopores have been observed immediately after removal of the first atomic layers from the irradiated surface. It was established that, the threshold for ion-implanted platinum corresponds to fluence F = 10¹⁷ ions/cm². For Pd(CuAg) it was revealed that nanopores have been down to 80 nm deep with current density 340 µA/cm². Their dimensions and volume fractions were determined. The obtained results can be used for prediction of radiation stability of materials based on fcc metals. (paper)