Abstract
The influence of multi-pass cold drawing on the evolution of microstructure, texture, and properties of Cu matrix composite, reinforced by in situ grown graphene, has been systematically investigated. Under continuous and severe plastic deformation, the grains in the composite were continuously refined to nanoscale. In addition, graphene in the composite could be gradually refined, exfoliated, and redispersed. Interestingly, dynamic recrystallization of the composite was formed after 80% drawing reduction and its formation mechanism was discussed. The texture of the as-drawn composite comprised a mixture of fiber textures with dominated <111> and minor <100> orientation after 99.7% severe drawing reduction. The tensile properties and electrical conductivity of the as-drawn composites were also investigated. This work provides a better guideline on the plastic deformation behavior of the advanced graphene/metal nanocomposite.
Highlights
Li et al [27] studied a graphene/Al composite wire prepared by powder metallurgy and multi-pass cold drawing, and found that the dispersion of graphene and mechanical properties of the composite could be improved during the cold drawing
The typical growth process of graphene, which was systematically studied in our recent investigation [11], can be briefly described as follows: In the first step, naphthol (0.1 wt%) and Cu powders were added in ethanol (AR) with constant stirring and the solution was sonicated for 20 min
The main reason for the use of flake Cu powders rather than granular Cu powders is that flake Cu powders have a larger specific surface area, which can adsorb more carbon source, and grow more graphene compared with the particles [10,11]
Summary
Metal matrix composites reinforced by graphene (Gr/MMCs) have recently attracted considerable attention and researchers strive to improve its structural or functional properties [1–5]. As recently systematically reported by our research group, the hot rolling behavior of Cu nanocomposite reinforced by graphene indicates that the hot rolling process has a significant effect on both the plastic deformation of matrix and graphene, which affects the properties of composites [30]. Another plastic deformation technique, cold drawing, has recently been gradually applied to fabricate advanced graphene/metal wires using its severe plastic deformation [27,31]. Li et al [27] studied a graphene/Al composite wire prepared by powder metallurgy and multi-pass cold drawing, and found that the dispersion of graphene and mechanical properties of the composite could be improved during the cold drawing. This work provides a deep understanding of the plastic deformation process of Gr/MMCs and can be a guide for the preparation of Gr/MMCs with high performance
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