Microcracks in nuclear graphite and highly oriented pyrolytic graphite (HOPG)

Microcracks with varied length and width are observed in nuclear grade graphite and highly oriented pyrolytic graphite (HOPG) by transmission electron microscopy. In situ observations show that these cracks tend to close up on heating the sample. The crystal dimensional change from in situ electron-...

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Bibliographic Details
Published inJournal of nuclear materials Vol. 381; no. 1; pp. 199 - 203
Main Authors Wen, Keyun, Marrow, James, Marsden, Barry
Format Journal Article
LanguageEnglish
Published Elsevier B.V 31.10.2008
Subjects
28.52.Fa
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Summary:Microcracks with varied length and width are observed in nuclear grade graphite and highly oriented pyrolytic graphite (HOPG) by transmission electron microscopy. In situ observations show that these cracks tend to close up on heating the sample. The crystal dimensional change from in situ electron-irradiation also causes the closure of the cracks. Although some of the cracks may be identifiable as accommodation porosity (i.e. Mrozowski cracks), others appear to have already formed prior to carbonization and graphitization.
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ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2008.07.012