Abstract
Reduced Activation Ferritic/Martensitic steels are being extensively studied because of their foreseen application in fusion and Generation IV fission reactors. To mimic neutron irradiation conditions, Eurofer97 samples were implanted with helium ions at energies of 500 keV and 2 MeV and doses of 5x1015-1016 He /cm2, creating atomic displacements in the range 0.07–0.08 dpa. The implantation induced defects were characterized by positron beam Doppler Broadening (DB) and Thermal Desorption Spectroscopy (TDS). The DB data could be fitted with one or two layers of material, depending on the He implantation energy. The S and W values obtained for the implanted regions suggest the presence of not only vacancy clusters but also positron traps of the type present in a sub-surface region found on the reference sample. The traps found in the implanted layers are expected to be HenVm clusters. For the 2 MeV, 1016 He/cm2 implanted sample, three temperature regions can be observed in the TDS data. Peaks below 450 K can be ascribed to He released from vacancies in the neighbourhood of the surface, the phase transition is found at 1180 K and the peak at 1350 K is likely caused by the migration of bubbles.
Highlights
Eurofer97 is a Reduced Activation Ferritic/Martensitic (RAFM) steel used as reference structural material for future fusion reactors
The work described here is part of a larger project in which Thermal Desorption spectroscopy (TDS) and electron microscopy studies will be performed on Eurofer97 neutron irradiated in the High Flux Reactor at NRG
He implantations have been performed in Eurofer97 steel with energies of 500 keV and 2 MeV and doses of 5x1015 and 5x1016 He/cm2
Summary
Eurofer is a Reduced Activation Ferritic/Martensitic (RAFM) steel used as reference structural material for future fusion reactors. Eurofer steel known to possess a high resistance against swelling from gaseous transmutation products (hydrogen, helium) has attractive mechanical properties and shows reduced activation behavior in a fusion neutron spectrum [1]. The work described here is part of a larger project in which Thermal Desorption spectroscopy (TDS) and electron microscopy studies will be performed on Eurofer neutron irradiated in the High Flux Reactor at NRG. The thermal behavior of the implanted He is studied in parallel by TDS
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