Nano-hardening features in high-dose neutron irradiated Eurofer97 revealed by atom-probe tomography
B. Gómez-Ferrer, C. Dethloff, E. Gaganidze, L. Malerba, Constantinos Hatzoglou, C. Pareige
Abstract
High dose (15 and 32 dpa), 300–330 °C neutron irradiated Eurofer97 samples (WTZ, ARBOR-I and SPICE campaigns) have been analysed using atom probe tomography . Segregation of solutes (Si, P, Mn and sometimes Cr and Ni) has been observed at dislocation loops , dislocation lines , grain boundaries and sometimes forming clusters. The decorated objects are extensively surrounded by “Mn clouds”. Around the “Mn clouds” a high density population of spherical CrMn-rich clusters which nucleate sometimes at the Cr-rich border of dislocation loops has been revealed. Finally, considering the density and size of (i) decorated DLs, (ii) voids, (iii) CrMn-rich clusters and (iv) precipitates, the increase of the yield stress has been assessed based on a quadratic superposition of Orowan models.