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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
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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

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References

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