Characterization of crack-tip dislocations and their effects on materials fracture

Kenji Higashida, Masaki Tanaka, Sunao Sadamatsu

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Three-dimensional structure of crack tip dislocations were investigated by combining scanning transmission electron microscopy (STEM) and electron tomography (ET) in silicon single crystals. P-type (001) silicon single crystals were employed. <110> cracks were introduced from an indent on the (001) surface. The specimen was heated at 873K in order to introduce dislocations at the crack tips. The specimen was thinned to include the crack tip in the foil by an iron milling machine. STEM-ET observation revealed the three-dimensional structure of crack tip dislocations. Their Burgers vectors were determined by using an invisibility criterion. The local stress intensity factor was calculated using the dislocation characters obtained in the observation in this study, indicating that the dislocations observed were mode II shielding type dislocations.

    Original languageEnglish
    Title of host publicationPRICM7
    Pages2307-2311
    Number of pages5
    Volume654-656
    DOIs
    Publication statusPublished - 2010
    Event7th Pacific Rim International Conference on Advanced Materials and Processing, PRICM-7 - Cairns, QLD, Australia
    Duration: Aug 2 2010Aug 6 2010

    Publication series

    NameMaterials Science Forum
    Volume654-656
    ISSN (Print)02555476

    Other

    Other7th Pacific Rim International Conference on Advanced Materials and Processing, PRICM-7
    Country/TerritoryAustralia
    CityCairns, QLD
    Period8/2/108/6/10

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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