3-D structures of crack-tip dislocations and their shielding effect revealed by electron tomography

Masaki Tanaka, Masaki Honda, Sunao Sadamatsu, Kenji Higashida

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    Three-dimensional structures of crack-tip dislocations in silicon crystals have been examined by combining scanning transmission electron microscopy and computed tomography. Cracks were introduced by a Vickers hardness tester at room temperature, and the sample was heated at 823 K for 1 h in order to introduce dislocations around the crack tips. Dislocation segments cut out from loops were observed around the crack tip, the three-dimensional structure of which was characterized by using by electron tomography. Their Burgers vectors including the sings were also determined by oscillating contrasts along dislocations. In order to investigate the effect of the dislocations on fracture behaviours, local stress intensity factor due to one dislocation was calculated, which indicates the dislocations observed were shielding type to increase fracture toughness.

    Original languageEnglish
    Pages (from-to)S55-S60
    JournalJournal of Electron Microscopy
    Volume59
    Issue numberSUPPL. 1
    DOIs
    Publication statusPublished - Aug 2010

    All Science Journal Classification (ASJC) codes

    • Instrumentation

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