Indentation-induced damage mechanisms in germanium

David J. Oliver, Jodie E. Bradby, Jim S. Williams, Michael V. Swain, Damien McGrouther, Paul Munroe

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


    The response of crystalline Ge to indentation has been studied over a range of maximum loads. At a certain load, an unusual 'giant pop-in' event occurs, in which a discontinuous extension of >1 μm is observed in the force-displacement curve. In such cases, load release curves show a pronounced 'elbowing' response, leading to increased depth recovery. TEM and Raman microspectroscopy revealed the presence of amorphous material in the residual impression. To examine cracking, a sequence of cross-sections was milled through the indent and images taken using an automated method (the 'slice-and-view' method). Using 3-D reconstruction software, the data was segmented and reconstructed into a 3-dimensional representation of the cracks around the indent. Applying this technique to indents featuring a giant pop-in, it was deduced that the inelastic elbowing observed was a bending response of material detached by lateral cracking. The giant pop-in is attributable to material removal, caused by lateral cracks formed during loading.

    Original languageEnglish
    Title of host publicationFocused Ion Beams for Analysis and Processing
    Number of pages6
    Publication statusPublished - 2007
    Event2006 MRS Fall Meeting - Boston, MA, United States
    Duration: 27 Nov 20061 Dec 2006

    Publication series

    NameMaterials Research Society Symposium Proceedings
    ISSN (Print)0272-9172


    Conference2006 MRS Fall Meeting
    Country/TerritoryUnited States
    CityBoston, MA


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