Abstract
Effect of 25keV He ion irradiation on three model Fe100−xCrx alloys (x=5.8, 10.75 and 15.15) was investigated by means of the conversion electron Mössbauer spectroscopy. A short-range ordering (SRO) parameter concerning a distribution of Cr atoms within the first-two neighbour shells, <α12>, for all three non-irradiated samples was positive, hence indicative of ordering, yet its amplitude, hence the degree of ordering, was decreasing with x. For the samples irradiated to the dose of 1.2·1017 He+/cm2 (7.5dpa) <α12>was unaffected for x=5.8 and 10.75 but its value was negative for x=15.15 i.e. an irradiation-induced inversion of the SRO-parameter occurred.
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