| Abstract Scope |
Dynamics of lattice defects often governs the degradation processes in metallic materials under various extreme environments. We have been directly examining defect dynamics, using in-situ transmission electron microscopy (TEM) [1], with high-voltage electron microscopes (HVEMs) in Osaka University and Nagoya University, ion-accelerator combined TEM, and an atomic-resolution magnetic-field-free microscope recently installed in Shimane University [2] being powerful for observation of magnetic materials such as iron and steels. In this talk, I will show our recent studies on defect dynamics in iron, the primary component of ferritic steels. The provided topics are: (1) formation of allotropic point-defect clusters under irradiation, (2) effects of hydrogen on dislocation behavior, and (3) anomalous temperature dependence of the interaction between a gliding dislocation and a radiation-produced point-defect clusters.
References
[1] K. Arakawa, et al., Nature Materials 19 (2020) 508.
[2] T. Maekawa, K. Arakawa, et al., Ultramicroscopy 276 (2025) 114181. |