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In situ TEM annealing of ion-amorphized Hi Nicalon S and Tyranno SA3 SiC fibers

Abstract : In this work, recrystallization of ion-amorphized Hi Nicalon Type S and Tyranno SA3 SiC fibers (4 MeV Au3+, 2 × 1015 cm−2) has been studied via in situ TEM annealing. Both fibers show a two-step recovery process of the radiation damage. First recovery stage starts at temperatures as low as 250 °C and implies recovery of the radiation swelling. Eventually the amorphous layer recrystallizes with no signs of polytype change (3C-SiC). Recrystallization temperatures yield 900–920 °C and 930 °C for the HNS and the TSA3 respectively. HNS fiber shows columnar recrystallization perpendicular to the amorphous–crystalline interphase with a grain growth rate of ∼20 nm min−1. On the other hand, recrystallization of TSA3 fiber is rather “spontaneous” with no preferential growth direction. The different recrystallization is attributed to the different microstructure of the fibers.
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Submitted on : Thursday, December 19, 2019 - 9:47:21 AM
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J. Huguet Garcia, A. Jankowiak, S. Miro, E. Meslin, Y. Serruys, et al.. In situ TEM annealing of ion-amorphized Hi Nicalon S and Tyranno SA3 SiC fibers. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2016, 374, ⟨10.1016/j.nimb.2015.12.032⟩. ⟨cea-02418713⟩



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