Near-perfect elastoplasticity in pure nanocrystalline copper |
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Authors: | Champion Yannick Langlois Cyril Guérin-Mailly Sandrine Langlois Patrick Bonnentien Jean-Louis Hytch Martin J |
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Affiliation: | Centre d'Etudes de Chimie Métallurgique-CNRS, 15 rue Georges Urbain, 94407 Vitry-sur-Seine, France. yannick.champion@glvt-cnrs.fr |
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Abstract: | Ductile metals and alloys undergo plastic yielding at room temperature, during which they exhibit work-hardening and the generation of surface instabilities that lead to necking and failure. We show that pure nanocrystalline copper behaves differently, displaying near-perfect elastoplastic behavior characterized by Newtonian flow and the absence of both work-hardening and neck formation. We observed this behavior in tensile tests on fully dense large-scale bulk nanocrystalline samples. The experimental results further our understanding of the unique mechanical properties of nanocrystalline materials and also provide a basis for commercial technologies for the plastic (and superplastic) formation of such materials. |
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