Abstract : Aluminum samples have been exposed to a hydrogen plasma generated by a low-pressure-high-density microwave reactor. Aluminum has been chosen as a surrogate for Beryllium. The fluence was kept below 4 × 10 24 ions/m 2 , in order to study the first steps of nucleation and growth of surface and bulk defects, i.e. blisters and bubbles. Experimental analyzes and macroscopic rate equation (MRE) modeling on poly-and single-crystals were made to investigate the role played by grains boundaries in the hydrogen retention. Temperature programmed desorption (TPD) on Al poly-crystals revealed the production of aluminum hydrides (alanes) as majority species in the desorption flux. Comparison of microscopy observations for three different single-crystal orientations (〈100〉, 〈110〉 and 〈111〉) allowed to determine preferential orientations able to attenuate the formation of blisters.
C. Quiros, J. Mougenot, R. Bisson, M. Redolfi, A. Michau, et al.. Blistering and hydrogen retention in poly- and single- crystals of aluminum by a joint experimental-modeling approach. Nuclear Materials and Energy, Elsevier, 2019, 20, pp.100675. ⟨10.1016/j.nme.2019.100675⟩. ⟨hal-02121395⟩