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

• Published in: Scripta materialia Vol. 208; p. 114338
• Main Authors: Ma, Kan, Décamps, Brigitte, Fraczkiewicz, Anna, Prima, Frédéric, Loyer-Prost, Marie
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-02-2022; Elsevier
• Subjects: Chemical Sciences; Dislocation; Material chemistry; Microstructure; Nickel; Radiation damage; TEM; Nickel; Microstructure; TEM; Radiation damage; Dislocation; dislocation; microstructure; radiation damage
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2021.114338

Nickel is widely used as a 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, an inversion of loop nature (vacancy-type in irradiated zones v.s. interstitial-type in unirradiated zones) and a change of loop Burgers vector (1/3 and 1/2 loops v.s. only 1/2 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 one-dimension migration. A defect-free layer related to the annihilation of vacancy defects by injected atoms is detected. . It allows the identification of the injection peak which is uncommon for self-ion irradiated specimens and validates the damage calculations.
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