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Journal Articles Scripta Materialia Year : 2021

Inversion of dislocation loop nature driven by cluster migration in self-ion irradiated nickel

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Abstract

Nickel is widely used as fcc model material to obtain insight into fundamental mechanisms of radiation damage. This work presents irradiation of high-purity nickel using self-ions at 450°C and fine analysis of dislocation loops in specimens prepared by Focus Ion Beam using Transmission Electron Microscopy. For the first time to our knowledge, a drastic change of both loop nature (vacancy-type in irradiated zones v.s. interstitial-type in unirradiated zones) and loop Burgers vector (1/3<111> and 1/2<110> loops v.s. only 1/2<110> loops) is identified along the implantation direction in irradiated nickel. This change may be attributed to the formation of interstitial <110> crowdions and their long-range 1D migration. A defect-free layer related to the annihilation of vacancy defects by injected atoms is detected. It provides an easy way to identify the injection peak in self-ion irradiated specimens and solid validation for damage calculations.
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Dates and versions

cea-03482273 , version 1 (15-12-2021)

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Kan Ma, Brigitte Décamps, Anna Fraczkiewicz, Frédéric Prima, Marie Loyer-Prost. Inversion of dislocation loop nature driven by cluster migration in self-ion irradiated nickel. Scripta Materialia, 2021, 208, pp.114338. ⟨10.1016/j.scriptamat.2021.114338⟩. ⟨cea-03482273⟩
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