Hostname: page-component-cd9895bd7-dzt6s Total loading time: 0 Render date: 2024-12-27T01:47:10.120Z Has data issue: false hasContentIssue false
  • English
  • Français

Correlations of Microstructure and TEM Observations of Plasticity in Metallic Nanolaminates

Published online by Cambridge University Press:  14 March 2011

Donald E. Kramer  and
Tim Foecke
Donald E. Kramer
Affiliation:
Metallurgy Division, National Institute of Standards and Technology Technology Administration, US Department of Commerce Gaithersburg, Maryland 20899-8553
Tim Foecke
Affiliation:
Metallurgy Division, National Institute of Standards and Technology Technology Administration, US Department of Commerce Gaithersburg, Maryland 20899-8553
Get access

Abstract

Nanolaminate materials exhibit increases in hardness and yield strength beyond those expected according to rule of mixtures calculations. Several models have been proposed to explain this enhancement of strength, but conclusive experimental verification is hindered by the complex interaction between ingrown defects, in-plane microstructure and compositional modulation. In this study, mechanisms of plastic deformation in nanolaminates are investigated by in situ TEM straining of epitaxial Cu/Ni nanolaminates grown on Cu (001) single crystal substrates. Two distinct types of deformation are observed. Initial plastic deformation is accommodated by motion of “Orowan” and threading dislocations in a uniform and random fashion. As the stress levels increase, fracture occurs creating a mixed mode crack. Subsequent observations suggest that intense plastic deformation occurs over many bilayers in the direction of crack growth, but is contained to within one or two bilayers in a direction normal to the crack faces.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 634: Symposium B – Structure and Mechanical Properties of Nanophase Materials-Theory & Computer Simulations vs. Experiment , 2000 , B4.3.1
Copyright
Copyright © Materials Research Society 2001

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Chu, X. and Barnett, S. A., J. Appl. Phys., 77, 4403 (1995).Google Scholar
2. Tench, D. and White, J., Metall. Trans., 15A, 2039 (1984).Google Scholar
3. Ruff, A.W. and Lashmore, D.S., Wear, 151, 245 (1991).Google Scholar
4. Koehler, J. S., Phys. Rev. B, 2, 547 (1970).Google Scholar
5. Anderson, P. M. and Li, C., Nanostruct. Mater., 5, 349 (1995).Google Scholar
6. Daniels, B. J., Nix, W. D. and Clemens, B. M., Appl. Phys. Lett., 66, 2969 (1995).Google Scholar
7. Misra, A., Verdier, M., Kung, H., Embury, J. D. and Hirth, J. P., Scripta Mater., 41, 973 (1999).Google Scholar
8. Lu, Y-C., Kung, H., Griffin, A. J. Jr., Nastasi, M. A. and Mitchell, T. E., J. Mater. Res., 12, 1939 (1997).Google Scholar
9. Was, G. S. and Foecke, T., Thin Solid Films, 286, 1 (1996).Google Scholar
10. Foecke, T. and Heerden, D. van, in Chemistry and Physics of Nanostructures and Related Non-Equilibrium Materials, edited by Ma, E., Fultz, B., Shull, R., Morral, J. and Nash, P. (TMS, 1997) pp. 193–200.Google Scholar
11. Anderson, P. M., Foecke, T. and Hazzledine, P. M., MRS Bull., 24 (2), 27–33 (1999).Google Scholar
12. Moffat, T. P., J. Electrochem. Soc., 142, 3767 (1995).Google Scholar
13. Embury, J. D. and Hirth, J. P., Acta metall. mater., 42, 2051 (1994).Google Scholar
14. Ohr, S.M., Mater. Sci. Engng., 72, 1 (1985).Google Scholar