Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1448446 | Acta Materialia | 2009 | 13 Pages |
Abstract
Nanocomposite wires composed of a multi-scale Cu matrix embedding Nb nanotubes are cyclically deformed in tension under synchrotron radiation in order to follow the X-ray peak profiles (position and width) during mechanical testing. The evolution of elastic strains vs. applied stress suggests the presence of phase-specific elasto-plastic regimes. The nature of the elasto-plastic transition is uncovered by the “tangent modulus” analysis and correlated to the microstructure of the Cu channels and the Nb nanotubes. Finally, a new criterion for the determination of the macroyield stress is given as the stress to which the macroscopic work hardening, θa = dσa/dε0, becomes smaller than one third of the macroscopic elastic modulus.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Ludovic Thilly, Steven Van Petegem, Pierre-Olivier Renault, Florence Lecouturier, Vanessa Vidal, Bernd Schmitt, Helena Van Swygenhoven,