Abstract
This work is part of research on the emerging techniques to produce bulk nanostructured composites materials by severe plastic deformation and their characterization. Based on the Levi work, we present a new method to synthesize a composite wire-containing carbon-nanosized filaments (graphite and C60fullerenes) embedded in a copper matrix. The originality of this process is using powder media as fiber. Microstructures and electrical, mechanical, and thermal properties are presented.
Highlights
Plastic deformation processing is a “top-down” approach to nanostructuring metals and alloys based on the accumulation of ultralarge plastic strain to achieve microstructure refinement [1]
Cu-CGr and Cu-C60 composites electrical resistivity is around 2 μΩ · cm, close to Cu-b2 copper used for processing (Table 3)
The presence of graphite or C60 fullerenes, the first being a poor conductor compared to copper, the second being an insulator [43], weakly influences the electrical conductivity of the composite
Summary
Plastic deformation processing is a “top-down” approach to nanostructuring metals and alloys based on the accumulation of ultralarge plastic strain to achieve microstructure refinement [1]. Several variants and combination [9] of plastic deformation techniques, including accumulative repetitive deformation [3], were developed Accumulative Spin-Bonding (ASB) [10], Equal Channel Angular Rolling (ECAR) [11, 12], Cyclic Extrusion Compression (CEC) [13], Cyclic Closed-Die Forging (CCDF) [14, 15], Linear Flow Splitting (LFS) [16], Severe Torsion Straining (STS) [17], Torsion Extrusion Process (TEP) [18], Cylinder Covered Compression (CCC) [19], Asymmetric Rolling (AR) [20, 21], and Accumulative Deep Wire-Drawing and bonding (WD) [22,23,24]. The best known example is cold drawing of eutectoid carbon steels
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