Radiation damage evolution in pure W and W-Cr-Hf alloy caused by 5 MeV Au ions in a broad range of dpa

Pure W and W-Cr-Hf alloy which are prospective materials for nuclear fusion reactors, such as DEMO, were irradiated at room temperature with 5 MeV Au2+ ions fluences between 4 × 1014 1.3 1016 ions.cm?2 to generate various levels of lattice damage from about units up tens dpa. The distinct character radiation accumulation, microstructure defect nature have been observed in both pure alloys, the latter exhibited interesting ability reorganisation size decrease higher ion determined by positron annihilation spectroscopy (PAS). High rate layer has evidenced samples already lower Au-ion compared samples, where increased steps increasing fluence. accumulation was accompanied different implanted distribution Secondary Ion Mass Spectrometry (SIMS) well thermal properties shown consequent worsening depth good agreement Au-depth concentration profiles. TEM corroborated above mentioned findings, sub-surface release after irradiation, maximum dislocation loop density identified according predicted dpa (displacement particles per atom) fluences. Moreover, shows band structure appeared exhibiting high projected range Au-ions simultaneously additional larger isolated dislocations pronounced a growing function Such phenomenon not samples.