Publication Date
2024
Document Type
Thesis
Committee Members
Hamed Attariani, Ph.D. (Advisor); Henry D. Young, Ph.D. (Committee Member); Sheng Li, Ph.D. (Committee Member)
Degree Name
Master of Science in Mechanical Engineering (MSME)
Abstract
Swift Heavy Ions (SHI) irradiation, characterized by high kinetic energy ions, induces significant material/structural modification, e.g., latent track. However, the intricate interaction among various physics, i.e., mechanical stress, phase transition, and heat transfer, has been ignored in the continuum-based approaches in favor of simplicity. Here, we developed a two-dimensional coupled phase-field inelastic-thermal spike (PF-iTS) model to investigate the effect of thermal crosstalk, elastic energy, and irradiation flux on latent track formation. A particular focus is placed on investigating the influence of internal mechanical stress on latent track formation. Simulation results reveal a shift in critical stopping energy and a reduction in track radius in the presence of mechanical stress, indicating a suppressive effect on latent track formation. Furthermore, the paper explores the effects of ion flux and simultaneous versus delayed ion collisions on track morphology. Simulations demonstrate how thermal cross-talk between simultaneous incidents can alter track dimensions, with closer incidents resulting in larger track radii due to temperature field overlap. The results reveal a shift in the critical electronic stopping energy and a reduced track radius under mechanical stress. Additionally, the study demonstrates the impact of thermal crosstalk between incidents, i.e., simultaneous and delayed double ion impacts, showing potential track merging and variations in track morphology.
Page Count
53
Department or Program
Department of Mechanical and Materials Engineering
Year Degree Awarded
2024
Copyright
Copyright 2024, all rights reserved. My ETD will be available under the "Fair Use" terms of copyright law.
ORCID ID
0009-0006-2806-3734
