Investigation of the effect of irradiation with gaseous and metallic ions on the atomic structure of the alloy Fe+15 at.% Cr

In the metastable solid solution Fe-15at.%Cr short range ordering (decomposition) was caused by irradiation at 723 K using Ar and Fe ions. The short range order parameter was evaluated from Moessbauer spectra. The short range order caused by the irradiation is much higher compared to the effect of only annealing at723 K for the same time without irradiation. The decomposition is not limited to the penetration depth of the ions but extends over the whole sample thickness of 30 µm. Therefore it is explained as due to radiation dynamic long range effects.