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

Abstract

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.

Analysis of As-Built Microstructures and Recrystallization Phenomena on Inconel 625 Alloy Obtained via Laser Powder Bed Fusion (L-PBF)

“…The effect of the crystallographic texture, as (100)-oriented grains exhibited lower yield stress than other ones [55]; 3.…”

Efficient simulation of single and poly-crystal plasticity based on the pencil glide mechanism

“…They are determined by comparing the model responses between β-model and a reference full-field FEM simulation of a polycrystalline aggregate following the strategy depicted in [36]. The effective accommodation variable β is given by [25,37]:…”

Predicting electrical conductivity in Cu/Nb composites: a combined model-experiment study

“…Many material candidates have been considered for these high-magnet applications, including Cu/stainless steel [4,5], Cu/Nb [1,4,5], Cu/Cr [6], Cu/W [7], Cu/Ta [8], and Cu/Ag [2,9,10]. Consequently, many studies have investigated microstructural effects on strength and conductivity properties of these composites in an effort to enhance the material properties [11][12][13][14][15][16][17][18][19][20][21]. However, this remains a challenge as the material microstructure can significantly impact material properties in unexpected ways.…”