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Cuivre nanostructuré et nanopoudres de cuivre dope avec de l'argent pour l'étude du comportement thermo-mécanique

Abstract : At room temperature, metallic nanomaterials reveal a near-perfect elasto-plastic behavior. To have a better understanding of the plastic deformation of nanomaterials, the thermo-mechanical behavior of bulk nanostructured copper was studied by strain-rate jump tests under moderate temperatures and by relaxation tests at room temperature. Two parameters are measured from those tests: a high strain-rate sensitivity (m = 0,17) from which a ductility close to 100% can be predicted and low apparent activation volumes (10 to 50 b3) revealing a rate-controlling mechanism based on dislocations interacting with grain boundaries. Besides, modification of grain boundaries structure due to silver segregation could be of particular interest for the study of mechanical properties. The preparation of bulk nanostructured copper doped with silver atoms by powder metallurgy was thus investigated.
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https://tel.archives-ouvertes.fr/tel-00011386
Contributor : Cecilie Duhamel <>
Submitted on : Monday, January 16, 2006 - 12:17:49 PM
Last modification on : Monday, October 19, 2020 - 11:10:50 AM
Long-term archiving on: : Tuesday, June 15, 2010 - 4:27:39 PM

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Cecilie Duhamel. Cuivre nanostructuré et nanopoudres de cuivre dope avec de l'argent pour l'étude du comportement thermo-mécanique. Matériaux. Université Paris XII Val de Marne, 2005. Français. ⟨tel-00011386⟩

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