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Indentation-Induced Damage Mechanisms in Germanium

Published online by Cambridge University Press:  26 February 2011

David J Oliver ,
Jodie E Bradby ,
Jim S Williams ,
Michael V Swain ,
Damien McGrouther  and
Paul Munroe
David J Oliver
Affiliation:
djo109@rsphysse.anu.edu.au, Australian National University, Electronic Materials Engineering, Canberra, ACT 0200, Canberrra, 0200, Australia
Jodie E Bradby
Affiliation:
jodie.bradby@anu.edu.au, Australian National University, Electronic Materials Engineering, Canberra, ACT 0200, Canberrra, 0200, Australia
Jim S Williams
Affiliation:
jim.williams@anu.edu.au, Australian National University, Electronic Materials Engineering, Canberra, ACT 0200, Canberrra, 0200, Australia
Michael V Swain
Affiliation:
mswain@mail.usyd.edu.au, University of Sydney, Biomaterials Science Research Unit, Sydney, N/A, Australia
Damien McGrouther
Affiliation:
d.mcgrouther@unsw.edu.au, University of New South Wales, Electron Microscope Unit, Sydney, 2052, Australia
Paul Munroe
Affiliation:
p.munroe@unsw.edu.au, University of New South Wales, Electron Microscope Unit, Sydney, 2052, Australia
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Abstract

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.

Keywords

Gefractureion beam analysis
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 983: Symposium LL – Focused Ion Beams for Analysis and Processing , 2006 , 0983-LL08-02
Copyright
Copyright © Materials Research Society 2007

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