Abstract
Graphene-reinforced copper composites recently have attracted more attention, since they exhibited excellent mechanical properties and could be used widely in many fields. Few-layer graphene (FLG) and copper powder were mixed by ball milling to produce homogeneous composite powders. Then, FLG-reinforced copper composites (FLG/Cu) were fabricated by spark plasma sintering (SPS) using the composite powders with a FLG volume fraction of 2.4 vol%. The effects of the rotating speed and the time of ball milling were analyzed based on the microstructure evolution and properties of the FLG/Cu composites. Obvious strengthening effect of FLG was found for the composites, and the conductance of the composite reaches 70.4% of IACS. The yield strength of the composite produced by ball milling at a speed of 100 r/min for 4 h is 376 MPa, which is 2.5 times higher than that of copper and higher than that of copper composite enhanced by 5 vol% CNTs (360 MPa). The defects produced in FLG with the increase of rotating speed and time could reduce the mechanical and conductive properties of the composites.
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Acknowledgments
This work was financially supported by the National Basic Research Program of China (No. 2011CB612200), Program of Qinghai Science and Technology Department (2012-Z-701), China Scholarship Council (No. 201206125006), and Harbin Key Technologies R&D Program (2012DB2CP029).
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Cui, Y., Wang, L., Li, B. et al. Effect of Ball Milling on the Defeat of Few-Layer Graphene and Properties of Copper Matrix Composites. Acta Metall. Sin. (Engl. Lett.) 27, 937–943 (2014). https://doi.org/10.1007/s40195-014-0156-x
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DOI: https://doi.org/10.1007/s40195-014-0156-x