Bubble-loop complexes induced by helium irradiation and effect of pre-irradiation and post-irradiation of hydrogen in reduced-activation ferritic/martensitic steel

Formation of Bubble-Loop Complexes During Helium Radiation in Fe-9Cr Steel

“…The density of bubble-loop complexes in region 2 is about three times as large as that in region 1, which is consistent with the trend of change of bubble density along with the depth. Bubble-loop complexes have been observed in pure Fe and Fe-Cr-based steels irradiated by dual-beam ions (Fe ion + He ion) and single-beam He ions (Brimbal et al, 2014;Chen et al, 2008;Brimbal et al, 2011;Bhattacharya et al, 2019;Zhang et al, 2018;Li et al, 2020). Chen et al (2008) 4.…”

“…On the other hand, He atoms can reduce the loops' mobility so that loops are left to absorb additional interstitials to further grow (Brimbal et al, 2014). Especially, it is also found that the He ion injection can lead to the heterogeneous nucleation of cavities or bubbles inside the plane of the dislocation loops in Fe-Cr alloys or ferritic-martensitic steels (Chen et al, 2008;Brimbal et al, 2011;Brimbal et al, 2014;Zhang et al, 2018;Bhattacharya et al, 2019;Li et al, 2020). This special structure between bubbles and loops was called "bubble-loop complexes" in some papers (Chen et al, 2008;Zhang et al, 2018;Li et al, 2020).…”

“…Especially, it is also found that the He ion injection can lead to the heterogeneous nucleation of cavities or bubbles inside the plane of the dislocation loops in Fe-Cr alloys or ferritic-martensitic steels (Chen et al, 2008;Brimbal et al, 2011;Brimbal et al, 2014;Zhang et al, 2018;Bhattacharya et al, 2019;Li et al, 2020). This special structure between bubbles and loops was called "bubble-loop complexes" in some papers (Chen et al, 2008;Zhang et al, 2018;Li et al, 2020). Zhang et al (2018) believed that this special structure can promote the growth of dislocation loops.…”

“…This special structure between bubbles and loops was called "bubble-loop complexes" in some papers (Chen et al, 2008;Zhang et al, 2018;Li et al, 2020). Zhang et al (2018) believed that this special structure can promote the growth of dislocation loops. However, the formation mechanism and conditions of this structure are still unclear.…”