Journal
MATERIALS RESEARCH LETTERS
Volume 5, Issue 3, Pages 195-200Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2016.1243591
Keywords
He implantation; TEM; bubbles; denuded zones; grain boundary
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Funding
- US Department of Energy (DOE) Basic Energy Sciences (BES) Early Career program [DE-SC0008274]
- US Department of Energy (DOE) Office of Science [DE-AC52-06NA25396]
- Sandia National Laboratories [DE-AC04-94AL85000]
- US Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
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Nanocrystalline materials are radiation-tolerant materials' candidates due to their high defect sink density. Here, nanocrystalline iron films were irradiated with 10 keV helium ions in situ in a transmission electron microscope at elevated temperatures. Grain-size-dependent bubble density changes and denuded zone occurrence were observed at 700 K, but not at 573 K. This transition, attributed to increased helium-vacancy migration at elevated temperatures, suggests that nanocrystalline microstructures are more resistant to swelling at 700 K due to decreased bubble density. Finally, denuded zone formation had no correlation with grain size and misorientation angle under the conditions studied.
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