Localized shear deformation and fracture in a Zr-based bulk metallic glass

Tatsuya Morikawa, Tetsuro Kawada, Kenji Higashida

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

    Abstract

    Behaviors of fracture and deformation in a Zr-Al-Ni-Cu bulk metallic glass(BMG) was investigated by using three-point bending tests. Apparent fracture toughness obtained by bending test was 40MPam1/2 which is comparable to the value of ductile crystalline metals. This high toughness of the BMG should be understood by the crack-tip plasticity as well as crystalline metals. It is well known that plastic deformation occurs very inhomogeneously when BMGs are deformed at room temperature. Such inhomogeneity is manifested by the appearance of surface steps caused by localized shear deformation. In the present study, the surface steps due to the localized shear bands near a fracture surface have been examined in detail by using SEM and AFM, where much attention has been paid on the variation of the surface step height measured along the localized shear band. The variation of the step height indicates the gradient of plastic shear deformation, and it can be understood, in principle, as the introduction of elastic singularities corresponding dislocations in the case of crystalline materials.

    Original languageEnglish
    Title of host publicationSupplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006
    PublisherTrans Tech Publications Ltd
    Pages2094-2099
    Number of pages6
    EditionPART 2
    ISBN (Print)0878494286, 9780878494286
    DOIs
    Publication statusPublished - 2007
    Event5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006 - Vancouver, Canada
    Duration: Jul 4 2006Jul 8 2006

    Publication series

    NameMaterials Science Forum
    NumberPART 2
    Volume539-543
    ISSN (Print)0255-5476
    ISSN (Electronic)1662-9752

    Other

    Other5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006
    Country/TerritoryCanada
    CityVancouver
    Period7/4/067/8/06

    All Science Journal Classification (ASJC) codes

    • General Materials Science
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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