Abstract
The swelling and phase stability of neutron-irradiated FeCrMn and FeCrNi alloys are compared in the range 420–600°C. While the behavior of the two alloy systems exhibits many similarities, that of the FeCrMn system is more complex, involving a higher level of phase instabilities. However, the sensitivity of radiation-induced density changes to composition is less in the FeCrMn system. In the FeCrMn system there are three major components of density change, namely void growth, ferrite formation and lattice parameter changes of the retained austenite; whereas void swelling is the only major component of density change in the FeCrNi system.
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