|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Mechanical Behavior and Degradation of Advanced Nuclear Fuel and Structural Materials
||The Interaction between an Extended Edge Dislocation and a Helium Bubble in Copper
||Wurong Jian, Shuozhi Xu, Yanqing Su, Irene J. Beyerlein
|On-Site Speaker (Planned)
Exposed to irradiation environment, structural metals in nuclear reactors suffer from the bombardment of high-energy particles, generating large amounts of nano-sized He bubbles. Such bubbles can interact with the gliding dislocations and then give rise to the strain hardening of metals. By performing molecular dynamics simulation in Cu, we investigate the interaction between an edge dislocation and He bubble. Instead of the conventional bypass modes over a He bubble, i.e., bubble cutting and dislocation climb, a new multi-step-bypass (MSB) maneuver is found at room temperature when the He-vacancy ratio is large enough and the ratio of the bubble spacing to its diameter is reduced below a threshold. For MSB, the entire dislocation changes its glide plane to overcome the bubble, which is promoted by higher temperature and larger He-vacancy ratio in the bubble. Compared to the conventional bypass mechanisms, MSB is more energetically favorable.
||Computational Materials Science & Engineering, Modeling and Simulation, Mechanical Properties