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SPECIAL SECTION ON NANOMATERIALS AND NANOMECHANICS

A Self-Consistent Model for the Inelastic Deformation of Nanocrystalline Materials

[+] Author and Article Information
L. Capolungo

 LPMM-CNRS University of Metz, Ile du Saulcy, 57045, Metz, Cedex 1 France and  George W. Woodruff School of Mechanical Engineering, Atlanta, Georgia 30332-0405

M. Cherkaoui1

 LPMM-CNRS University of Metz, Ile du Saulcy, 57045, Metz, Cedex 1 Francecherk@lpmm.univ-metz.fr

J. Qu

 George W. Woodruff School of Mechanical Engineering, Atlanta, Georgia 30332-0405

1

Corresponding author: Telephone: + 33-3-87-31-54-74; Fax: + 33-3-87-31-53-66.

J. Eng. Mater. Technol 127(4), 400-407 (Feb 22, 2005) (8 pages) doi:10.1115/1.1925288 History: Received September 13, 2004; Revised February 22, 2005

A self-consistent scheme is used to describe the behavior of nanocrystalline F.C.C. materials. The material is approximated as a composite with two phases. The inclusion phase represents the grain cores while the matrix phase represents both grain boundaries and triple junctions. The dislocation glide mechanism is incorporated in the constitutive law of the inclusion phase while a thermally activated mechanism accounting for the penetration of dislocations in the grain boundaries is incorporated in the constitutive law of the matrix phase. The model is applied to pure Cu and the results are compared with various experimental data.

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Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Scheme of the emission of dislocation and its penetration in a grain boundary

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Figure 2

Resistance diagram

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Figure 3

Size effect in the stress strain curves of the inclusion phase

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Figure 4

Effect of strain rate on the behavior of the inclusion phase

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Figure 5

Size effect in the stress strain curves of the matrix phase

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Figure 6

Effect of strain rate on the behavior of the matrix phase

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Figure 7

Size effect in the stress strain curves of the global material

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Figure 8

Effect of strain rate on the behavior of the global material

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Figure 9

Stress strain curves of the global material for various grain sizes

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Figure 10

Evolution of the yield stress with the grain size for various strain rates

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