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- W2994361491 abstract "Abstract Irradiation of zirconium alloys by neutrons causes dimensional changes associated with the formation of dislocation loops. In undeformed single crystals of this hexagonal close-packed material, an expansion in the crystallographic -direction and a contraction in the -direction are observed as a function of neutron fluence consisting of three stages, namely a rapid initial change, followed by a plateau, and then an accelerated “breakaway” growth whilst the volume remains constant. Molecular dynamics simulations suggest an atomic-level explanation: the initial dimensional changes are related to the formation of -type nano-clusters of self-interstitial atoms (SIAs) while vacancies remain mostly isolated. In the plateau-region, formation of -type vacancy loops compensates for the effect of growing SIA clusters and SIA -loops. Upon further irradiation, vacancy loops grow while the anisotropically diffusing SIAs anneal preferentially vacancy -loops. By having a preferential vacancy sink on the basal plane and a net flow of interstitials to -loops, the dimensional changes accelerate, thus leading to breakaway growth. The present simulations yield values for the thermodynamic stability, strain fields, and their effect on dimensional changes for vacancy and -loops as a function of their size, thus providing critical input for continuum models of radiation-induced growth of zirconium." @default.
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- W2994361491 date "2020-02-01" @default.
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- W2994361491 title "Vacancy loops in Breakaway Irradiation Growth of zirconium: Insight from atomistic simulations" @default.
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- W2994361491 doi "https://doi.org/10.1016/j.jnucmat.2019.151946" @default.
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