In this work we have used a combination of computer simulation with experimental work to improve our understanding of the mechanisms that govern bubble superlattice formation. Irradiations were carried out using helium ions into nickel foils at a range of temperatures and energies while in situ TEM was used to monitor the irradiations in real time. The simulations are based on a combination of rate theory and Monte Carlo techniques using the anisotropic diffusion of self-interstitial atoms model of cavity superlattice formation expanded to include modelling of the gas pressures inside of the bubbles. We discuss the temperature formation limits of bubble superlattices, the role of the helium appm to DPA ratio, the stability of cavity superlattices and some of the other common points of discussion in the literature including measures of superlattice quality and the relationship between the superlattice parameter and bubble diameter.
| Date of Award | 29 Aug 2025 |
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| Original language | English |
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| Supervisor | Simon Barrans (Main Supervisor) & Graeme Greaves (Co-Supervisor) |
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