Plasticity Mechanisms in Multi-Scale Copper-Based Nanocomposite Wires
Copper-based high strength nanofilamentary wires reinforced by Nb nanofilaments are prepared by severe plastic deformation (repeated hot extrusion, cold drawing and bundling steps) for the winding of high pulsed magnets. The effects of microstructure refinement on the plasticity mechanisms were studied via nanoindentation, in-situ deformation in TEM and under neutron beam: all results evidence size effects in each nanostructured phase of the nanocomposite wires, i.e. single dislocation regime in the finest regions of the Cu matrix and whisker-like behaviour in the Nb nanofilaments. The macroscopic high yield stress is thus the results of the combination of the different elastic-plastic regimes of each phase that include size effects.
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
L. Thilly et al., "Plasticity Mechanisms in Multi-Scale Copper-Based Nanocomposite Wires", Materials Science Forum, Vols. 539-543, pp. 814-819, 2007