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Etude du gonflement par cavités d'un alliage d'aluminium irradié sous faisceau d'ions

Abstract : 6061-T6 (Al-Mg-Si) aluminum alloy chose for the core of the Jules Horowitz Reactor (JHR) benefits from the T6 structural hardening induced by nanoprecipitates formed after an annealing followed by a quench and an artificial ageing. Because of the thickness of reactor parts, the quench rate is far slower than what is commonly seen on usual thin plates. In order to study the influence of the quench on the microstructure and the behavior under irradiation, three 10 cm side cubes of 6061 alloy have been tempered with a T6 treatment in three different quenching conditions (water, oil and air). Treatment have been followed by microstructural investigations on each temper.The contribution of voids, formed under fast neutron flux, to the global swelling of the alloy is poorly known. Using ion irradiation on bulk TEM samples at different damage levels (from 15 dpa to 100 dpa), microstructural evolutions have been characterized and swelling has been both quantified and modeled.Triple beam irradiations (W, He, Si) alloying to obtain a consistent damage level while implanting fission products (Si, He) showed silicon implantation lead to the precipitation of a new Si enriched phase. Simple beam irradiations (Au), showed voids are localized around linear defects and dispersoïds. Implantation of helium lead to a homogeneous distribution of bubbles in the whole matrix. Acknowledging the very high dose of helium implanted, quantitative measurements of swelling has been performed exclusively on single beam irradiated samples.The measured swelling, higher than what has been observed under neutron flux, lead to consider two series of data (ions and neutrons) in order to model the swelling. The base of a swelling model has been performed and the remaining physical parameters to determine were identified.
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Submitted on : Tuesday, March 3, 2020 - 2:38:10 PM
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Victor Garric. Etude du gonflement par cavités d'un alliage d'aluminium irradié sous faisceau d'ions. Physique Nucléaire Expérimentale [nucl-ex]. Université Grenoble Alpes, 2019. Français. ⟨NNT : 2019GREAI091⟩. ⟨tel-02497131⟩



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