Abstract
A static computer simulation is performed in order to study the nucleation and the two-dimensional growth mode of helium-filled aggregates in nickel. The results indicate that a helium-filled aggregate expels neighbouring atoms at its outer edges. These atoms are displaced in the direction of a nearest octahedral position and they are bound to the cluster.The helium-filled aggregate grows in a planar way and an interstitial loop is formed by the emitted atoms. The two dimensional growth occurs parallel with the close-packed planes. To explain the collapse of the platelets into clusters of smaller aggregates, a theoretical model is developed to describe the total energy of a platelet. It is based partly on the results of the simulations. The variation of the total energy gives information regarding the platelet stability and is calculated in both a numerical and an analytical way. It is shown that small platelets are stable and that, once a critical radius is attained, the platelet becomes unstable and a transformation into a group of smaller aggregates takes place. The theoretical model can also explain the fact that two-dimensional helium aggregates are observed to be more stable in bcc than in fcc structures.
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D’Olieslaeger, M., Knuyt, G., De Schepper, L., Stals, L.M. (1991). Theoretical Description of the Growth and Stability of Helium Platelets in Nickel. In: Donnelly, S.E., Evans, J.H. (eds) Fundamental Aspects of Inert Gases in Solids. NATO ASI Series, vol 279. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-3680-6_3
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