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Migration energy of a self-interstitial atom in $$alpha$$-iron estimated by in situ observation of interstitial clusters at low temperatures using high-voltage electron microscopy

Abe, Yosuke ; Sato, Yuki*; Hashimoto, Naoyuki*

Modeling cluster dynamics or rate theory to describe the microstructural evolution of irradiated materials requires a precise knowledge of the migration energy of a self-interstitial atom (SIA), a product of energetic particle radiation. We measured the evolution of the number density of SIA clusters in electron-irradiated $$alpha$$-iron at low temperatures (110-320 K) by in situ observation using high-voltage electron microscopy. We identified temperature-dependent physical quantities, including (1) the peak density of SIA clusters and (2) the critical defect-free zone thickness in a thin foil specimen, associated with interstitial mobility. By fitting these quantities to the Arrhenius relations derived by rate theory analysis, we obtained estimated interstitial migration energy values of $$0.26 pm 0.04$$ and $$0.30 pm 0.03$$ eV for (1) and (2), respectively.

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Category:Materials Science, Multidisciplinary

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