Journal
MATERIALS RESEARCH LETTERS
Volume 5, Issue 7, Pages 478-485Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2017.1323808
Keywords
Ion-beam processing; ion implantation; precipitation
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Funding
- U.S. Department of Energy, NEUP program [DE-NE0008297]
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Although accelerator-based ion irradiation has been widely accepted to simulate neutron damage, neutron-atypical features need to be carefully investigated. In this study, we have shown that Coulomb force drag by ion beams can introduce significant amounts of carbon, nitrogen, and oxygen into target materials even under ultra-high vacuum conditions. The resulting compositional and microstructural changes dramatically suppress void swelling. By applying a beam-filtering technique, introduction of vacuum contaminants is greatly minimized and the true swelling resistance of the alloys is revealed and matches neutron behavior closely. These findings are a significant step toward developing standardized procedures for emulating neutron damage. [GRAPHICS] IMPACT STATEMENT An innovative 'beam shaking' technique is proposed to reduce beam-induced impurity contamination in accelerator-based ion irradiation. Without this technique, void swelling of ion-irradiated alloys can be greatly underestimated.
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