A macro-scale ruck and tuck mechanism for deformation in ion-irradiated polycrystalline graphite

نویسندگان

چکیده

A vein structure, which becomes more pronounced with increasing ion dose, was found on the surface of polycrystalline HOPG (highly oriented pyrolytic graphite) implanted by ex situ C+ (up to 1.8 × 1017 ions/cm2), and in Ar+ a transmission electron microscope (TEM). These veins are be independent crystallographic orientations associated formation pores. Underneath veins, triangular-shaped core formed graphite platelet inside displaced up towards surface. macro-scale ‘ruck&tuck’ geometry thus generated at these triangle structure boundaries. Progressive movement dislocations along basal planes during irradiation observed, mechanistic model proposed this basis explain formation. small increase c-spacing observed but it is believed that plays vital role dimensional property changes graphite, especially when stress gradient present. The also explains change thermal expansion irradiation. Together Heggie’s Barsoum’s ‘ripplocations’ models, present considered have provided an additional experimentally proven mechanism responsible for behaviour materials.

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ژورنال

عنوان ژورنال: Carbon

سال: 2021

ISSN: ['0008-6223', '1873-3891']

DOI: https://doi.org/10.1016/j.carbon.2020.10.086