Mechanical properties of bulk single crystalline nanoporous gold investigated by millimetre-scale tension and compression testing

In this work, the mechanical behaviour of millimetre-scale, bulk single crystalline, nanoporous gold at room temperature is reported for the first time. Tension and compression tests were performed with a custom-designed test system that accommodates small-scale samples. The absence of grain boundar...

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Bibliographic Details
Published in:Philosophical magazine (Abingdon, England) England), 2014-03, Vol.94 (8), p.847-866
Main Authors: Briot, Nicolas J., Kennerknecht, Tobias, Eberl, Christoph, Balk, T. John
Format: Article
Language:English
Subjects:
Applied sciences
Compression tests
Compressive strength
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Crystal structure
Defects and impurities in crystals
microstructure
Deformation, plasticity, and creep
Elasticity and anelasticity
Elasticity. Plasticity
Exact sciences and technology
Gold
Grain and twin boundaries
Grain boundaries
Materials science
mechanical behaviour
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
nanoporous
Nanostructure
Physics
Position (location)
scaling law
small scale
Strength
Structure of solids and liquids
crystallography
Treatment of materials and its effects on microstructure and properties
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Summary:In this work, the mechanical behaviour of millimetre-scale, bulk single crystalline, nanoporous gold at room temperature is reported for the first time. Tension and compression tests were performed with a custom-designed test system that accommodates small-scale samples. The absence of grain boundaries in the specimens allowed measurement of the inherent strength of millimetre-scale nanoporous gold in tension. The elastic modulus and strength values in tension and compression were found to be significantly lower than values measured with nanoindentation-based techniques and previously reported in the literature, but close to those reported for millimetre-scale polycrystalline samples tested using traditional compression techniques. Fracture toughness was found to be very low, in agreement with the macroscopic brittleness of nanoporous gold, but this is due to the localization of deformation to a narrow zone of ligaments, which individually exhibit significant plasticity and necking.
ISSN:1478-6435
1478-6443
DOI:10.1080/14786435.2013.868944