Skip to main content Accessibility help
×
Home

The Micromechanisms of Deformation in Nanoporous Gold

  • Rui Dou (a1) and Brian Derby (a2)

Abstract

We have carried out a TEM investigation of the micromechanisms of deformation in these nanoporous gold specimens after compression testing. We find that the nanoporous specimens show deformation localised to the nodes between the ligaments of the foamed structure, with very high densities of microtwins and Shockley partial dislocations in these regions. These deformation structures are very different from those seen after solid nanowires are tested in compression, which show very low dislocation densities and a few sparsely distributed twins. However, similar dislocation structures to those found in the nanoporous specimens are observed in the larger nanowires when they are deformed in bending. The currently accepted model for the deformation of nanoporous gold, implicitly assumes that the deformation of these structures is by bending near the nodes where ligaments intersect. We hypothesis that the much higher dislocation densities seen in both the nanoporous gold and the nanowires deformed in bending are evidence for the presence of geometrically necessary dislocations in these deformed structures.

Copyright

References

Hide All
1 Uchic, M. D., Dimiduk, D. M., Florando, J. N., and Nix, W. D., Science 305, 986 (2004).
2 Greer, J. R., Oliver, W. C. and Nix, W. D., Acta Mater 53, 1821 (2005); Errata: J. R. Greer, W. C. Oliver and W. D. Nix, Acta Mater 54, 1705 (2006).
3 Dou, R. and Derby, B., Scripta Mater. 61, 524 (2009).
4 Biener, J., Hodge, A. M. and Hamza, A.V., Appl. Phys. Lett. 87, 121908 (2005).
5 Biener, J., J. et al. Nano Lett. 6, 2379 (2006).
6 Volkert, C. A. and Lilleodden, E. T., Philos. Mag. 86, 5567 (2006).
7 Volkert, C. A., Lilleodden, E. T., Kramer, D. and Weissmuller, J., Appl. Phys. Lett. 89, 061920, (2006).
8 Lee, D., et al. Scripta Mater. 56, 437 (2007).
9 Hakamada, M. and Mabuchi, M., Scripta Mater. 56, 1003 (2007).
10 Hodge, A. M., et al Acta Mater. 55, 1349 (2007).
11 Gibson, L. J. and Ashby, M. F., Proc. Royal Soc. Lon. A, 382, 43 (1982).
12 Gibson, L. J. and Ashby, M. F., Cellular Solids: Structure and Properties. 2nd Edn., (Cambridge University Press, 1997).
13 Greer, J. R. and Nix, W. D., Phys. Rev. B 73, 245410 (2006).
14 Shan, Z. W, et al. Nature Mater.7, 115 (2008).
15 Oh, S. H., Legros, M., Kiener, D. and Dehm, G., Nature Mater. 8, 95 (2009).
16 Dou, R. and Derby, B., J. Mater. Res. In press 25, (2010); DOI 10.1557/JMR.2010.0099.
17 Sun, Y., Ye, J., Minor, A. W. M. and Balk, T. J., Microscopy Res. Tech. 72, 232, (2009).
18 Jin, H. J. et al. Acta Mater. 57, 2665 (2009).
19 Dou, R. and Derby, B., Scripta Mater. 59, 151 (2008).
20 Ji, C. X. and Searson, P.C., J. Phys. Chem. B, 107, 4494 (2003).

Keywords

Related content

Powered by UNSILO

The Micromechanisms of Deformation in Nanoporous Gold

  • Rui Dou (a1) and Brian Derby (a2)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.