Understanding the Interdependence of Penetration Depth and Deformation on Nanoindentation of Nanoporous Silver

A silver-based nanoporous material was produced by dealloying (selective chemical etching) of an Ag38.75Cu38.75Si22.5 crystalline alloy. Composed of connected ligaments, this material was imaged using a scanning electron microscope (SEM) and focused ion-beam (FIB) scanning electron microscope tomogr...

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Bibliographic Details
Published in:Metals (Basel ) 2019-12, Vol.9 (12), p.1346
Main Authors: Champion, Yannick, Laurent-Brocq, Mathilde, Lhuissier, Pierre, Charlot, Frédéric, Moreira Jorge Junior, Alberto, Barsuk, Daria
Format: Article
Language:English
Subjects:
Alloys
Chemical etching
Chemical Sciences
Densification
Experiments
Ion beams
Material chemistry
Mechanical properties
Morphology
Nanoindentation
Penetration depth
Porosity
Silver
Solids
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Summary:A silver-based nanoporous material was produced by dealloying (selective chemical etching) of an Ag38.75Cu38.75Si22.5 crystalline alloy. Composed of connected ligaments, this material was imaged using a scanning electron microscope (SEM) and focused ion-beam (FIB) scanning electron microscope tomography. Its mechanical behavior was evaluated using nanoindentation and found to be heterogeneous, with density variation over a length scale of a few tens of nanometers, similar to the indent size. This technique proved relevant to the investigation of a material’s mechanical strength, as well as to how its behavior related to the material’s microstructure. The hardness is recorded as a function of the indent depth and a phenomenological description based on strain gradient and densification kinetic was proposed to describe the resultant depth dependence.
ISSN:2075-4701
2075-4701
DOI:10.3390/met9121346