|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
||G-30: The Dimensionality of Absorbed Defects Dictates GB Response to Irradiation
||Chang-Yu Hung, James Nathaniel, Emily Hopkins, Khalid Hattar, Mitra Taheri
|On-Site Speaker (Planned)
Grain boundary (GB) has been considered an effective defect sink for radiation-induced defects, including point defect, cluster, and dislocation loop. The progression of GB absorption from point defect absorption and recombination to loop absorption may lead to different GB responses. This study performed an in-situ irradiation technique to examine GB-mediated mechanisms of defect absorption in response to continuous irradiation in a model pure Au. At first, fluctuations of defect density occurring at the GB is a self-healing process, likely aided by GB microstate change. However, at high dpa, a defect denuded zone is closed, followed by denuded zone re-opening. The denuded zone re-opening at higher dpa is associated with a pronounced strain field induced by extensive loop interaction with GB that causes loop absorption and rapid GB structure changes.