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Article Dans Une Revue Science Année : 2003

Near-Perfect Elastoplasticity in Pure Nanocrystalline Copper

Résumé

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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Chimie
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Dates et versions

hal-03356720 , version 1 (28-09-2021)

Identifiants

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Yannick Champion, Sandrine Guérin-Mailly, Patrick Langlois, Jean-Louis Bonnentien, Martin Hÿtch. Near-Perfect Elastoplasticity in Pure Nanocrystalline Copper. Science, 2003, 300 (5617), pp.310-311. ⟨10.1126/science.1081042⟩. ⟨hal-03356720⟩
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