Abstract
The accelerated Ar+ ion irradiation at a fluence of 1.2 × 1015 cm–2 for 4 seconds formed 6.2% austenite in a cold-worked Fe–6.29 at % Mn alloy with a structure of α ferrite. The related ion beam heating of a foil 25 μm thick is 299 ± 5°C, according to temperature monitoring. The content of manganese calculated from Mossbauer spectroscopy data in α and γ phases after irradiation is 5.5 and 17.1 at %, respectively. Grounds for the activation of low-temperature atomic mobility in the alloy are discussed in this paper. The mobility was shown to not be caused by the formation of radiation defects and radiation-enhanced diffusion. Nanoscale dynamic effects, resulting in the possible viscous flow of material at the front of post-cascade shock waves propagating in a undamped mode, play a vital role.
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