Slip-line spacing in ZrB2-based ultrahigh-temperature ceramics

    Authors

    D. Ghosh; G. Subhash;N. Orlovskaya

    Comments

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    Abbreviated Journal Title

    Scr. Mater.

    Keywords

    Ultrahigh temperature ceramics; Slip-line spacing; Geometrically; necessary dislocations; Interface; STRAIN GRADIENT PLASTICITY; NICKEL-BASE SUPERALLOY; GRAIN-SIZE; DISLOCATION; DEFORMATION; INDENTATION; COMPOSITE; CRYSTAL; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering

    Abstract

    Macroscopic manifestation of microscale plasticity at room temperature in the form of slip-lines has been elusive in brittle solids. Recently, such a phenomenon has been reported in ZrB2 ceramics and ZrB2-SiC composites, where slip-lines were detected in room-temperature deformation. Here we show that the slip-line spacing increases with grain size in these ceramics and their composites. Such behavior has been rationalized on the basis of geometrically necessary dislocations and the role of grain boundaries and interfaces. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

    Journal Title

    Scripta Materialia

    Volume

    62

    Issue/Number

    11

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    839

    Last Page

    842

    WOS Identifier

    WOS:000277109200006

    ISSN

    1359-6462

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