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Deformation behavior and strain rate sensitivity of nanostructured materials at moderate temperatures

Published online by Cambridge University Press:  01 February 2011

Cécilie Duhamel ,
Sandrine Guérin ,
Martin Hÿtch  and
Yannick Champion
Cécilie Duhamel
Affiliation:
Centre d'Etude de Chimie Métallurgique (CECM-CNRS, UPR 2801) 15 rue Georges Urbain, 94407 Vitry-sur-Seine, France.
Sandrine Guérin
Affiliation:
Centre d'Etude de Chimie Métallurgique (CECM-CNRS, UPR 2801) 15 rue Georges Urbain, 94407 Vitry-sur-Seine, France.
Martin Hÿtch
Affiliation:
Centre d'Etude de Chimie Métallurgique (CECM-CNRS, UPR 2801) 15 rue Georges Urbain, 94407 Vitry-sur-Seine, France.
Yannick Champion
Affiliation:
Centre d'Etude de Chimie Métallurgique (CECM-CNRS, UPR 2801) 15 rue Georges Urbain, 94407 Vitry-sur-Seine, France.
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Abstract

Strain-rate jump tests in compression are carried out on nanostructured copper (grain size = 90 nm) at moderate temperatures (353K - 393K). Strain-rate sensitivity m is measured as a function of temperature, T, and strain rate, έ. Increasing temperature or decreasing strain rate induces an increase in the strain-rate sensitivity. For (έ, T) = (1×10-5 s-1, 393K), m is equal to 0.17 which is the highest value reported for nanocrystalline copper. These results of enhanced m are encouraging in terms of gain in ductility. The measurements emphasize the existence of a thermally activated mechanism different from the normal rate-controlling process observed for microcrystalline fcc metals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 880: Symposium BB – Mechanical Properties of Nanostructured Materials-Experiments and Modeling , 2005 , BB8.3
Copyright
Copyright © Materials Research Society 2005

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