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Haasen plot analysis of the Hall–Petch effect in Cu/Nb nanolayer composites

Published online by Cambridge University Press:  31 January 2011

M. F. Tambwe ,
D. S. Stone ,
A. J. Griffin ,
H. Kung ,
Y. Cheng  and
M. Nastasi
M. F. Tambwe
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin at Madison, Madison, Wisconsin 53706
D. S. Stone
Affiliation:
Department of Materials Science and Engineering, University of Wisconsin at Madison, Madison, Wisconsin 53706
A. J. Griffin
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
H. Kung
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Y. Cheng
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
M. Nastasi
Affiliation:
Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

We investigate the effects of layer thickness (t) on hardness (H) and rate sensitivity of the hardness (∂H/∂ ln ) in 1 μm-thick Cu/Nb nanolayer composites. For t < 10 nm, we find that H correlates with t according to H = H0 = H1t-1/2, suggestive of a Hall–Petch mechanism with layer interfaces replacing grain boundaries as barriers against dislocation motion. The measured levels of ∂H/∂ ln clearly indicate the operation of bulk-like dislocation mechanisms consistent with a Hall–Petch mechanism. However, based on a Haasen-plot activation analysis, it appears that the Hall–Petch coefficient, H1, is strongly rate-dependent, inconsistent with a conventional Hall–Petch mechanism. For specimens with t < 10 nm there is a saturation in hardness, but the rate sensitivity data indicate no clear evidence of a corresponding change in mechanism. Simple models are proposed.

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Articles
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Journal of Materials Research , Volume 14 , Issue 2 , February 1999 , pp. 407 - 417
Copyright
Copyright © Materials Research Society 1999

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