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The effect of He+ ion irradiation on a distribution of Cr atoms in model(EFDA) Fe(100-x)Cr(x) (x=5.8, 10.75, 15.15) was studied by means of conversionelectrons Mossbauer spectroscopy. The alloys were irradiated to the dose of1.2E16 ions per cm2 (7.5 dpa) with He+ of 0.25 and 2.0 MeV. The distribution ofCr atoms within the first two coordination shells around the probe Fe atoms wasexpressed in terms of the Warren-Cowley short-range order parameters alpha1(first-neighbour shell, 1NN), alpha2 (second-neighbour shell, 2NN) and alpha12(1NN+2NN. In non-irradiated alloys alpha1 was positive and alpha2 was negativefor all three samples which indicates an ordering of Cr atoms. Yet, the valueof alpha12 were close to zero, i.e. the distribution of Cr atoms averaged overthe first two coordination shells around the probe Fe atoms, was random. Theeffect of the irradiation of the Fe5Cr sample is similar for the two energiesof the He+ projectiles viz. increase of number of Cr atoms in the 1NN anddecrease in the 2NN shell. Consequently, the degree of the ordering increased.For the other two samples, the effect of the irradiation depends on thecomposition, and it is stronger for the less energetic ions where, in the caseof Fe10Cr, the disordering disappeared and some traces of Cr clustering(alpha12 weakly positive) can be seen. In the Fe15Cr sample the clustering isclear. In the samples irradiated with 2.0 MeV ions the ordering also survivedin the samples with x=10.75 and 15.15, although its degree became smaller thanin the Fe5Cr sample. Small changes in the magnetic texture were revealed.

Effect of 0.25 and 2.0 MeV He-ion irradiation on short-range ordering in model (EFDA) Fe-Cr alloys