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 |
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Format: | Artikel |
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. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.2051791 |