Abstract
The FeCrMn alloy system is being studied as an alternative to the FeCrNi system because of the desire to reduce long-term radioactivation in fusion power devices. In this study four Fe12Cr XMn ( X = 15, 20, 25, 30 wt.%) alloys were irradiated in FFTF to 20 dpa at 643 K and 40 dpa at 679, 793 and 873 K to investigate the influence of manganese content on void swelling and phase stability. These results confirm and expand the results of earlier studies which indicate that the FeCrMn system is relatively unstable compared to that of the FeCrNi system, with alpha and sigma phases forming as a consequence of thermal aging or high temperature irradiation.
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