Abstract
Thin films of nanoporous noble metals exhibit an interconnected, porous structure with ligament widths and pores on the order of 10 nm or higher. In this study, thin film stress measurements and in-situ nanoindentation in a transmission-electron microscope were performed to investigate the effects of nanoscale geometric confinement on the mechanical properties of metals and on dislocation-mediated plasticity. Although some films exhibit macroscopic cracking, the deformation of individual ligaments is completely ductile and clearly involves dislocation activity, even in 10 nm wide ligaments. The stresses generated in these films during thermal cycling correspond to bulk stresses that approach the theoretical strength of the metal. Film stress exhibits a dependence on film thickness, even though the ligament width is much smaller and would presumably govern deformation.
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References
D. Kramer, R.N. Viswanath, and J. Weissmuller, Nano Letters, 4 (2004), p. 793.
D. van Noort and C.F. Mandenius, Biosensors & Bioelectronics, 15 (2000), p. 203.
Y. Ding, M.W. Chen, and J. Erlebacher, Journal of the American Chemical Society, 126 (2004), p. 6876.
J. Erlebacher, M.J. Aziz, A. Karma, N. Dimitrov, and K. Sieradzki, Nature, 410 (2001), p. 450.
J. Erlebacher and K. Sieradzki, Scripta Materialia, 49 (2003), p. 991.
R. Li and K. Sieradzki, Physical Review Letters, 68 (1992), p. 1168.
C.A. Volkert et al., Applied Physics Letters, 89 (2006), p. 061920.
A. Mathur and J. Erlebacher, Applied Physics Letters, 90 (2007), p. 061910.
M. Hakamada and M. Mabuchi, Scripta Materialia, 56 (2007), p. 1003.
J. Biener et al., Journal of Applied Physics, 97 (2005), p. 024301.
J. Biener et al., Nano Letters, 6 (2006), p. 2379.
A.M. Hodge et al., Acta Materialia, 55 (2007), p. 1343.
Y. Ding, Y.J. Kim, and J. Erlebacher, Advanced Materials, 16 (2004), p. 1897.
J.Z. Zhu et al., Applied Physics Letters, 89 (2006), p. 133104.
D. Lee et al., Scripta Materialia, 56 (2007), p. 437.
A.M. Minor, J.W. Morris, and E.A. Stach, Applied Physics Letters, 79 (2001), p. 1625.
A.M. Minor et al., Nature Materials, 5 (2006), p. 697.
O.L. Warren et al., Materials Today, 10 (2007), p. 59.
W.D. Nix, Metall. Trans., 20A (1989), p. 2217.
L.J. Gibson and M.F. Ashby, Cellular Solids: Structures and Properties (Cambridge University Press, 1997).
R.W. Hertzberg, Deformation and Fracture Mechanics of Engineering Materials (New York, John Wiley & Sons, Inc, 1989).
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Sun, Y., Ye, J., Shan, Z. et al. The mechanical behavior of nanoporous gold thin films. JOM 59, 54–58 (2007). https://doi.org/10.1007/s11837-007-0118-0
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DOI: https://doi.org/10.1007/s11837-007-0118-0