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Ultra-high strength nanocomposite Cu/X (X=Nb, Ta)

The development of reinforced conductors, with high electrical conductivity and high strength, is essential to provide non-destructive high pulsed magnetic fields over 80 Tesla: a compromise is obtained with Cu-based continuous nanofilamentary wires (2 GPa ultimate tensile strength and 0.6 µohm.cm electrical resistivity at 77K). The fabrication process of these nanocomposite wires is based on severe plastic deformation applied by accumulative drawing and bundling (ADB), leading to a multi-scale copper matrix containing up to N=855 (4.4 109) continuous and parallel niobium fibers. Three ways of optimization have been investigated: they deal with the geometry of the reinforcement, the material and the process.

Publications:

Multiscale modeling of the anisotropic electrical conductivity of architectured and structured Cu-Nb composite wires and experimental comparison
T. Gu, J.R. Medy, F. Volpi, O. Castelnau, S. Forest, E. Herve-Luanco, F. Lecouturier, H. Proudhon, P.O. Renault, L. Thilly
Acta Materialia (2017)
http://dx.doi.org/10.1016/j.actamat...

Multiscale modeling of the elastic behavior of architectured and nanostructured Cu-Nb composite wires
T. Gu, O. Castelnau, S. Forest, E. Hervé-Luanco, F. Lecouturier, H. Proudhon, L. Thilly
International Journal of Solids and Structures 121 (2017) 148-162
https://doi.org/10.1016/j.ijsolstr....

COMPOSITE CONDUCTIVE CABLE COMPRISING NANOTUBES AND NANOFIBERS, COAXIAL MICROSTRUCTURE INCLUDING A COPPER MATRIX AND SAID NANOTUBES AND NANOFIBERS, AND METHOD FOR MANUFACTURING SAID MICROSTRUCTURE
L.THILLY, F. LECOUTURIER, J.B DUBOIS, N. FERREIRA, P.O RENAULT, P. OLIER
US patent: US 9,390,839 B2 July 12, 2016
European patent : EP 2 652 747 B1 May 4, 2016

Multiscale modeling of the electrical behavior of the Cu-Nb nano-composites
T. Gu, E. Hervé-Luanco, H. Proudhon, L. Thilly, F. Lecouturier, O. Castelnau, S. Forest
Matériaux et Techniques, 103, 309 (2015)

Cu-Nb nanocomposite wires processed by severe plastic deformation: effects of the multi-scale microstructure and internal stresses on elastic-plastic properties
J.B. Dubois, L. Thilly, P.O. Renault, F. Lecouturier
Advanced Engineering Materials, 14 (11) (2012) 998–1003

Microstructure and texture of copper/niobium composites processed by ECAE
E. Buet, J.B. Dubois, P. Olier, L. Thilly, F.Lecouturier, P.O. Renault
INTERNATIONAL JOURNAL OF MATERIAL FORMING : 5 (2) (2012) 121-127
http://dx.doi.org/10.1007/s12289-01...

Metallic composites processed via extreme deformation: Toward the limits of strength in bulk materials
D. Raabe, P.P. Choi , Y. Li, A. Kostka, X. Sauvage, F. Lecouturier, K. Hono, R. Kirchheim, R. Pippan , D. Embury
MRS Bulletin 35 (12) (2010) 982-991

Thermal stability of nanocomposite metals: In situ observation of anomalous residual stresses relaxation during annealing under synchrotron radiation
J.B. Dubois, L. Thilly, P.O. Renault, F. Lecouturier, M. Di Michiel
Acta Materialia 58 (2010) 6504–6512

A new criterion for the elasto-plastic transition in nanomaterials: application to size and composite effects on Cu-Nb nanocomposite wires , L. Thilly, S. Van Petegem, P.O Renault, F. Lecouturier, V. Vidal, B. Schmitt, H. Van Swygenhoven, Acta Mat, vol 57 (2009) 3157-3169

Plasticity of nanostructured Cu-Nb-based wires: strengthening mechanisms revealed by in-situ deformation under neutrons, V. Vidal, L. Thilly, S. Van Petegem, U. Stuhr, F. Lecouturier, P.-O. Renault and H. Van Swygenhoven, Scripta Mat, vol 60 (2009) 171-174

Cu nanowhiskers embedded in Nb nanotubes inside a multiscale Cu matrix: the way to reach extreme mechanical properties in high strength conductors, V. Vidal, L. Thilly, F. Lecouturier, P.-O. Renault, Scripta Materiala , vol 57 (3) (2007) 245-248

Effects of size and geometry on the plasticity of high strength copper/tantalum nanofilamentary conductors obtained by severe plastic deformation, V. Vidal, L. Thilly, F. Lecouturier, P.-O. Renault, Acta Materiala Vol 54 Iss 4 (2006) pp 1063-1075