Abstract
High temperature, neutron irradiated single crystal tungsten,with a post irradiation composition of W-1.20±0.11at.%Re-0.11±0.05at.%Os0.03±0.01at.%Ta was characterised using a combination of Atom ProbeTomography (APT) and Scanning Tunnelling Electron Microscopy (STEM). APTshowed that within nanoscale clusters of Re/Os, the atomic density wasabove the theoretical limit. Complimentary High Angle Annular Dark Field(HAADF) imaging shows that some clusters contain voids at their centrewhich are leading to APT aberrations and enhancing the atomic density.High resolution Energy Dispersive X-ray (EDX) spectroscopy shows thatvoids are decorated with a shell of rhenium with a small osmium clusterto one side.
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