Grain boundary metastability controls irradiation resistance in nanocrystalline metals
arxiv(2024)
摘要
Grain boundaries (GBs) in polycrystalline materials are powerful sinks for
irradiation defects. While standard theories assume that the sink efficiency of
a grain boundary is defined solely by its character before irradiation, recent
evidence conclusively shows that the irradiation sink efficiency is a highly
dynamic property controlled by the intrinsic metastability of GBs under
far-from-equilibrium irradiation conditions. In this paper, we reveal that the
denuded (i.e., defect-free) zone, typically the signature of a strong sink, can
collapse as irradiation damage accumulates. We propose a radiation damage
evolution model that captures this behavior based on the emergence of a series
of irradiation defect-enabled metastable GB microstate changes that dynamically
alter the ability of the GB to absorb further damage. We show that these
microstate changes control further defect absorption and give rise to the
formation of a defect network that manifests itself as a net Nye-tensor signal
detectable via lattice curvature experiments.
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