Microscopic failure behavior of nanoporous gold

We report on the fracture behavior of nanoporous (np)-Au with an open sponge-like morphology of interconnecting ligaments on the nanometer length scale. Despite its macroscopic brittleness, np-Au is microscopically a very ductile material as ligaments strained by as much as 200% can be observed in t...

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Veröffentlicht in:Applied physics letters 2005-09, Vol.87 (12), p.121908-121908-3
Hauptverfasser: Biener, Juergen, Hodge, Andrea M., Hamza, Alex V.
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Sprache:eng
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Zusammenfassung:We report on the fracture behavior of nanoporous (np)-Au with an open sponge-like morphology of interconnecting ligaments on the nanometer length scale. Despite its macroscopic brittleness, np-Au is microscopically a very ductile material as ligaments strained by as much as 200% can be observed in the vicinity of crack tips. Cell-size effects on the microscopic failure mechanism were studied by annealing treatments that increased the typical pore size/ligament diameter from ∼ 100 nm to ∼ 1 μ m . Ligaments with diameter of ∼ 100 nm fail by plastic flow and necking, whereas failure by slip was observed for larger ligaments with a diameter of ∼ 1 μ m . The absence of slip marks in 100 - nm -sized ligaments suggests a strongly suppressed dislocation activity, consistent with the high yield strength of np-Au.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2051791