Microstructures of neutron-irradiated Fe12Cr XMn ( X = 15–30) ternary alloys

Abstract

The FeCrMn alloy system is being studied as an alternative to the FeCrNi system because of the desire to reduce long-term radioactivation in fusion power devices. In this study four Fe12Cr 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 FeCrMn system is relatively unstable compared to that of the FeCrNi system, with alpha and sigma phases forming as a consequence of thermal aging or high temperature irradiation.