|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Mechanical Behavior and Degradation of Advanced Nuclear Fuel and Structural Materials
||NOW ON-DEMAND ONLY – On the Diffusion of Hydrogen Atoms towards Notch Tips in Zirconium Polycrystals: A CPFE Analysis
||Alireza Tondro, Hamidreza Abdolvand
|On-Site Speaker (Planned)
Hydrogen embrittlement is an important degradation mechanism affecting the lifetime of engineering components. The diffusion of hydrogen atoms into the metal lattice can be affected by the localized stresses that develop in the vicinity of service-induced flaws. This study uses a coupled diffusion-crystal plasticity finite element approach to study the redistribution of hydrogen atoms around service-induced flaws in zirconium polycrystals. The effects of texture, grain size, and notch tip geometry on the distribution of hydrogen concentration in the lattice sites are investigated. Results indicate that material texture can significantly affect the distribution of hydrogen atoms as well as the location of maximum hydrogen concentration. It is shown that with changing grain orientations, it is possible to move the location of peak hydrogen concentration away from the notch tip. It is further shown that some triple points and grain boundaries are prone to accommodate higher hydrogen concentration compared to grain interiors.