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Ferritic/martensitic steels will be used as structural components in nextgeneration nuclear reactors. Their successful operation relies on anunderstanding of irradiation-induced defect behaviour in the material. In thisstudy, Fe and FeCr alloys (3-12%Cr) were irradiated with 20 MeV Fe-ions at 313K to doses ranging between 0.00008 dpa to 6.0 dpa. This dose range covers sixorders of magnitude, spanning low, transition and high dose regimes. Latticestrain and hardness in the irradiated material were characterised withmicro-beam Laue X-ray diffraction and nanoindentation, respectively.  Irradiation hardening was observed even at very low doses (0.00008 dpa) andshowed a monotonic increase with dose up to 6.0 dpa. Lattice strainmeasurements of samples at 0.0008 dpa allow the calculation of equivalentFrenkel pair densities and corrections to the Norgett-Robinson-Torrens (NRT)model for Fe and FeCr alloys at low dose. NRT efficiency for FeCr is 0.2, whichagrees with literature values for high irradiation energy. Lattice strainincreases up to 0.8 dpa and then decreases when the damage dose is furtherincreased. The strains measured in this study are lower and peak at a largerdose than predicted by atomistic simulations. This difference can be explainedby taking temperature and impurities into account.

Dose and compositional dependence of irradiation-induced property change in FeCr