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Title: Self-organization of helium precipitates into elongated channels within metal nanolayers

Journal Article · · Science Advances

Material degradation due to precipitation of implanted helium (He) is a key concern in nuclear energy. Decades of research have mapped out the fate of He precipitates in metals, from nucleation and growth of equiaxed bubbles and voids to formation and bursting of surface blisters. By contrast, we show that He precipitates confined within nanoscale metal layers depart from their classical growth trajectories: They self-organize into elongated channels. These channels form via templated nucleation of He precipitates along layer surfaces followed by their growth and spontaneous coalescence into stable precipitate lines. The total line length and connectivity increases with the amount of implanted He, indicating that these channels ultimately interconnect into percolating “vascular” networks. In conclusion, vascularized metal composites promise a transformative solution to He-induced damage by enabling in operando outgassing of He and other impurities while maintaining material integrity.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1418768
Report Number(s):
LA-UR-17-25074
Journal Information:
Science Advances, Vol. 3, Issue 11; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 40 works
Citation information provided by
Web of Science

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Cited By (4)

Understanding the release of helium atoms from nanochannel tungsten: a molecular dynamics simulation journal June 2019
Ion beam analysis of fusion plasma-facing materials and components: facilities and research challenges journal December 2019
Symmetry breaking during defect self-organization under irradiation journal May 2020
An in situ study on Kr ion–irradiated crystalline Cu/amorphous-CuNb nanolaminates journal March 2019