A new criterion for elastoplastic transition in nanomaterials: Application to size and composite effects on Cu-Nb nanocomposite wires. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Acta Materialia Année : 2009

A new criterion for elastoplastic transition in nanomaterials: Application to size and composite effects on Cu-Nb nanocomposite wires.

Résumé

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.

Dates et versions

hal-00442885 , version 1 (23-12-2009)

Identifiants

Citer

L. Thilly, S. van Petegem, P. O. Renault, Florence Lecouturier, Vanessa Vidal, et al.. A new criterion for elastoplastic transition in nanomaterials: Application to size and composite effects on Cu-Nb nanocomposite wires.. Acta Materialia, 2009, 57, pp.3157. ⟨10.1016/j.actamat.2009.03.021⟩. ⟨hal-00442885⟩
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