Multiscale modeling of the elasto-plastic behavior of architectured and nanostructured Cu-Nb composite wires and comparison with neutron diffraction experiments

Tang Gu (1, 2) , J. R. Medy (3) , Vincent Klosek (4) , Olivier Castelnau (2, 5) , Samuel Forest (1) , Eveline Hervé-Luanco (1, 6, 7) , F. Lecouturier-Dupouy (8) , Henry Proudhon (1) , Pierre Olivier Renault (3) , Ludovic Thilly (3) , Patrick Villechaise (3)

1 CDM - Centre des Matériaux
2 PIMM - Laboratoire Procédés et Ingénierie en Mécanique et Matériaux
3 PPrime [Poitiers] - Institut Pprime [UPR 3346]
4 LLB - UMR 12 - Laboratoire Léon Brillouin
5 HESAM - HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université
6 LISV - Laboratoire d'Ingénierie des Systèmes de Versailles
7 UVSQ - Université de Versailles Saint-Quentin-en-Yvelines
8 LNCMI-G - Laboratoire national des champs magnétiques intenses - Grenoble

Nanostructured and architectured copper niobium composite wires are excellent candidates for the generation of intense pulsed magnetic fields ( 100T) as they combine both high strength and high electrical conductivity. Multi-scaled Cu-Nb wires are fabricated by accumulative drawing and bundling (a severe plastic deformation technique), leading to a multiscale, architectured, and nanostructured microstructure exhibiting a strong fiber crystallographic texture and elongated grain shape along the wire axis. This paper presents a comprehensive study of the effective elastoplastic behavior of this composite material by using two different approaches to model the microstructural features: full-field finite elements and mean-field modeling. As the material exhibits several characteristic scales, an original hierarchical strategy is proposed based on iterative scale transition steps from the nanometric grain scale to the millimetric macro-scale. The best modeling strategy is selected to estimate reliably the effective elasto-plastic behavior of Cu-Nb wires with minimum computational time. Finally, for the first time, the models are confronted to tensile tests and in-situ neutron diffraction experimental data with a good agreement.

Mots clés: Multiscale modeling; Neutron diffraction; Copper niobium wire

Domaines: Matériaux

Tang Gu, J. R. Medy, Vincent Klosek, Olivier Castelnau, Samuel Forest, et al.. Multiscale modeling of the elasto-plastic behavior of architectured and nanostructured Cu-Nb composite wires and comparison with neutron diffraction experiments. International Journal of Plasticity, 2019, 122, pp.1-30. ⟨10.1016/j.ijplas.2019.04.011⟩. ⟨hal-02266595v2⟩