Fusion materials and technologies
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Abstract
Abstract
Materials resistance under irradiation is one of the potential showstoppers for fusion power. Nanocrystalline metals have long been proposed as a viable solution due to the role of grain boundaries (GBs) in absorbing radiation defects. Here we observe dislocation loops disappearing into GBs leaving no trace through very large-scale atomistic simulations of nanocrystalline tungsten, a key plasma-facing material. Three simulations, with differing defect mobility, and hence defect density, reveal how unstable dislocations near grain boundaries are. Both generation and evolution of defects naturally arise through simulations, in a setting that provides a lower bound for defect mobility, implying that at operating times and temperatures this process is even more likely to occur. The postulated and experimentally observed phenomena of grain boundaries acting as sinks for mobile defects are validated here by parameter-free molecular dynamics.
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@article{Reali2026Spontaneous,
title = {Spontaneous dislocation loop absorption at grain boundaries: Atomistic insights from simulated irradiation of nanocrystalline tungsten},
author = {Luca Reali and Fredric Granberg and Max Boleininger and S. L. Dudarev and Daniel R. Mason},
journal = {Scripta Materialia},
year = {2026},
doi = {10.1016/j.scriptamat.2026.117618},
url = {https://doi.org/10.1016/j.scriptamat.2026.117618}
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