Size effects on the mechanical behavior of nanoporous Au |
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Authors: | Biener Juergen Hodge Andrea M Hayes Joel R Volkert Cynthia A Zepeda-Ruiz Luis A Hamza Alex V Abraham Farid F |
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Affiliation: | Nanoscale Synthesis and Characterization Laboratory, Lawrence Livermore National Laboratory, P.O. Box 808, L-367, Livermore, California 94550, USA. biener2@llnl.gov |
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Abstract: | Recent nanomechanical tests on submicron metal columns and wires have revealed a dramatic increase in yield strength with decreasing sample size. Here, we demonstrate that nanoporous metal foams can be envisioned as a three-dimensional network of ultrahigh-strength nanowires, thus bringing together two seemingly conflicting properties: high strength and high porosity. Specifically, we characterized the size-dependent mechanical properties of nanoporous gold using a combination of nanoindentation, column microcompression, and molecular dynamics simulations. We find that nanoporous gold can be as strong as bulk Au, despite being a highly porous material, and that the ligaments in nanoporous gold approach the theoretical yield strength of Au. |
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